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Project Specific Discussions => Filters/Equalizers => Topic started by: mrphotodude on October 05, 2008, 01:48:34 AM

Title: S800 Support Thread
Post by: mrphotodude on October 05, 2008, 01:48:34 AM
This is a support thread i have started for the S800 EQ.
I will list what conflictions I have run across below with the part number.

I am coding the following for easy use of the discrepancies I have come across.

SCH=schematic
PS=parts sheet/list
PCB=pc board
--------------------------------------------------------------------------------------------------
C3/C4- no problem, just wanted to make sure 6volts is correct...

C25
SCH=100nf
PS=100nf film
pcb=100uf electrolytic with round space and polarity marker

C28
SCH=470uf electrolytic
[email protected] electrolytic
PCB=100uf  electrolytic with round space and polarity marker

C26
[email protected]
[email protected]
PCB 100nf with small rectangle box

R43
SCH=47k
PS=1k5 1watt
PCB=1k5

R25
SCH=4k7
PS=4k7
PCB=4k5

These are on the pcb but not on the run sheet or schematic

cpsub 100nf
cpsu1 220uf
cpsu 220uf
cpsua 100nf

http://img171.imageshack.us/img171/4843/pcbfc1.jpg

(http://img171.imageshack.us/img171/4843/pcbfc1.jpg)
Title: S800 Support Thread
Post by: peterc on October 05, 2008, 05:06:27 AM
BOM is here:

http://twin-x.com/groupdiy/displayimage.php?album=lastup&cat=10096&pos=0

Notes/Errata:

>> C3/C4- no problem, just wanted to make sure 6volts is correct...

6v is per the original. I would use 16v

>> C25 : SCH=100nf  :  PS=100nf film : pcb=100uf electrolytic with round space and polarity marker

>> C28 : SCH=470uf elec : [email protected] elec : PCB=100uf electrolytic with round space and polarity marker

>>C26 : [email protected] elec : [email protected] : PCB 100nf with small rectangle box

Designations for the electrolytics & bypass film caps swapped around.

>> R43 : SCH=47k : PS=1k5 1watt : PCB=1k5

There are 2 R43's on the schem, the 47k R43 has been amended to R46 on the PCB.

>> R25 : SCH=4k7 : PS=4k7 : PCB=4k5

Should be 4k7

>> These are on the pcb but not on the run sheet or schematic
>> cpsub 100nf : cpsu1 220uf : cpsu 220uf : cpsua 100nf

These are PSU bypass caps, extra caps added to stabilise the power rails.

The back legs of the dual pots need to be bent slightly to fit into their holes.

Sorry for the confusion :oops:

Peter
Title: S800 Support Thread
Post by: Holger on October 05, 2008, 09:16:17 AM
I've just finsihed my first PCB, as far as I can tell from my headphones ist just works fine. Took me less than 2 hours to finish the first one.
I used Colin's kits.
Thanks to all for making this project possible.
As a former Trident 80b owner it was always my dream to get some of the EQs.

Excellent project
 :thumb:
(http://analogaud.io/ProjectFotoFolder/s800%20proto.jpg)
Title: S800 Support Thread
Post by: brother303 on October 05, 2008, 12:06:52 PM
Hi all,

one question on the psu :

Is it possible to run the unit with a 2x15V/30VA toroid?

The schems say 18V,but I have a 2x15 right in my hands and it would be cool to get started with this one. The NEs and TLs should work with 2x15,is this correct?

THX for this cool project!  :thumb:
Title: S800 Support Thread
Post by: okgb on October 05, 2008, 12:25:35 PM
I would think so , maybe slightly reduced headroom if it was 15 , but
you'll get more voltage than 15 after it is rectified & smoothed
for the regulators to pull it down to 18
Title: S800 Support Thread
Post by: Lowfreq on October 07, 2008, 03:37:22 AM
I've got a question about the 22k lin pots.
Can I use a 25k pot there instead? is it gonna mess anything up?

I have found some 25ks at a local surplus store here in NZ that fit the board perfectly, and 22ks are less common and more expensive.

I know in the G1176, it wasn't so much of an issue to use pots that were a little bit off the BOM, as it was for attack/release timing, and the diferences were within the tolerance ratings anyway.

I'll be stoked if I can use the 25Ks. I think they just had enough to cater for my 4 EQs, but I thought I should check here first.
Title: S800 Support Thread
Post by: peterc on October 07, 2008, 05:40:30 AM
Please see second post for errata.

Peter
Title: S800 Support Thread
Post by: brother303 on October 07, 2008, 09:34:12 AM
Quote
I would think so , maybe slightly reduced headroom if it was 15 , but
you'll get more voltage than 15 after it is rectified & smoothed
for the regulators to pull it down to 18


THX OKGB.

My so called 2x15 spits out 17,63V each side,unloaded of course. Should be enough for the regs.

 :thumb:
Title: S800 Support Thread
Post by: stitch-o on October 08, 2008, 02:39:57 PM
Quote from: "brother303"
The schems say 18V,

If I might ask a question::
Where might those schems be located?

This toroidal should do the trick? (http://www.partsexpress.com/pe/showdetl.cfm?Partnumber=122-620)

Cheers!
Title: S800 Support Thread
Post by: peterc on October 08, 2008, 03:53:06 PM
Schems are in the Lab gmail account. The transformer is a 250 VA unit, a 20 or 30 VA part will do the job & cost less. The Y236103 or 236203 will work fine.

Peter
Title: S800 Support Thread
Post by: geoff004 on October 08, 2008, 04:55:39 PM
For toroidals I've had a lot of luck with Antekinc.com - and their prices are good.
Possibly the AN-0220 for a smaller setup
- I don't know - maybe the AN-1220 for an 8 channel setup?
Title: S800 Support Thread
Post by: stitch-o on October 08, 2008, 05:15:18 PM
Quote from: "peterc"
Schems are in the Lab gmail account. The transformer is a 250 VA unit, a 20 or 30 VA part will do the job & cost less. The Y236103 or 236203 will work fine.

Peter

Perfect-o

Cheers!
Title: S800 Support Thread
Post by: 3nity on October 08, 2008, 05:28:41 PM
Antek stuff dont fit a 1U rack.
Title: S800 Support Thread
Post by: Brolik on October 08, 2008, 05:59:58 PM
Peter, are those transformers you mentioned big enough for the 8 channel or are they for the 2 channel version?
Title: S800 Support Thread
Post by: peterc on October 08, 2008, 06:11:37 PM
I would use a 50VA part for an 8 channel unit

Peter
Title: S800 Support Thread
Post by: mrphotodude on October 09, 2008, 07:18:41 AM
for the V6 psu board...
i see the ac input connection as ac,ac,gnd.
is that ac(15v)ac(other 15v) and gnd(nuetrals)?

or is that a single supply with the ac's being the ac line in and the gnd going to chassis?
Title: S800 Support Thread
Post by: Brolik on October 09, 2008, 06:55:22 PM
Quote
geoff004:
For toroidals I've had a lot of luck with Antekinc.com - and their prices are good.
Possibly the AN-0220 for a smaller setup
- I don't know - maybe the AN-1220 for an 8 channel setup?


That AN-1220 (100va w/ 20v secondaries) looks pretty sweet, esp. at only 18 bucks, is that gonna work for my 8-channel project?  If so I'm all over it.
Title: S800 Support Thread
Post by: Benny on October 10, 2008, 11:40:45 AM
Got my two boards from customs today. They look great and with the parts kits and the silkscreen it's pretty easy to do. Soldered them in 2 hours and they sound damn good...  :grin:

Thanks and  :guinness:  :sam:  to all involved.  :thumb:
Title: S800 Support Thread
Post by: Slenderchap on October 11, 2008, 04:02:07 AM
Could we be about to see..... "competitive EQ assembly"..... with medals awarded to the winner .....

Can anyone beat 2 hours ?... Benny has set the bar quite high with that.... and looks like he has pushed Holger back into a silver medal position....

Colin
www.audiomaintenance.com
Title: S800 Support Thread
Post by: Holger on October 11, 2008, 05:34:04 AM
Quote from: "Slenderchap"
Could we be about to see..... "competitive EQ assembly"..... with medals awarded to the winner .....

Can anyone beat 2 hours ?... Benny has set the bar quite high with that.... and looks like he has pushed Holger back into a silver medal position....

Colin
www.audiomaintenance.com


Colin, this is not a contest  :grin:
I finished the remaining seven boards in some 8 hours (ex pots) Hope they'll all work... It's an easy to do DIY project.

I hope that Tat's case arrives before the knobs.
Title: S800 Support Thread
Post by: TornadoTed on October 11, 2008, 01:08:15 PM
I've finished stuffing my 8 boards, took me about 4 hours yesterday and 3 today.

Any idea how long I need to make the wires from the PCB to the pots and switches for Purusha's 4u case?

What about length to the XLR's?

Twisted or not?
Title: S800 Support Thread
Post by: mrphotodude on October 14, 2008, 08:59:49 AM
what kind of poly caps are you guys using on these?
I need to order most likely from mouser...
have a choice of Wima, Rifa, AVX, arcotronics....

just wondering what is the best to use, price range does not vary enough for the amount i am doing(doing some green pre's as well at same time).
Title: S800 Support Thread
Post by: peterc on October 14, 2008, 09:29:03 AM
Wimas are always a good bet, I use the MKS2 or MKS4 ranges extensively. However the different di-electrics do have differing sound qualities.

I do not think there is a lot of difference between different makes for the same type of di-electric, though.

Peter
Title: S800 Support Thread
Post by: vulner on October 17, 2008, 11:08:05 PM
Quote from: "peterc"


>> C25 : SCH=100nf  :  PS=100nf film : pcb=100uf electrolytic with round space and polarity marker

>> C28 : SCH=470uf elec : [email protected] elec : PCB=100uf electrolytic with round space and polarity marker

>>C26 : [email protected] elec : [email protected] : PCB 100nf with small rectangle box

Designations for the electrolytics & bypass film caps swapped around.

>> These are on the pcb but not on the run sheet or schematic
>> cpsub 100nf : cpsu1 220uf : cpsu 220uf : cpsua 100nf

These are PSU bypass caps, extra caps added to stabilise the power rails.

Sorry for the confusion :oops:

Peter


Just to be clear here,
c29 and c30 that are on the schematic but not on the pcb are instead ,split up  between the 2- 220uf and 2- 100nf caps that are on the differing pcb layout?
(By the way the 220uf and 100nf caps were included in Colin's parts kit.)
...
Title: S800 Support Thread
Post by: matta on October 18, 2008, 08:57:42 AM
Hey Guys,

I had a few minutes to spare and thought it may help others as things like the polarity and IN/OUTPUT are not marked on the PCB so consulting the Schematic I deduced the following which may help others in their builds.

(http://www.matt-allison.com/diy/S800/S800-EQ-OVERLAY.jpg)

Built up my first complete channel yesterday and she works like a charm... have the other 15 waiting for pots and switches. I don't want to do them until I'M SURE they work with Purusha's racks.

Cheers

Matt

EDIT: Please note if using one of Purusha's S800 1U racks that the PCB's will go in with the traces facing upwards towards the top of the rack, which is the opposite of the drawing above. This needs to be done to make sure the right bands line up with the panel.
Title: S800 Support Thread
Post by: mrphotodude on October 18, 2008, 09:25:33 AM
thanks matta!
Title: S800 Support Thread
Post by: Tungstengruvsten on October 18, 2008, 01:31:07 PM
and just to clarify, it's just the box/electrolytic caps in the top left of the above diagram that are incorrect/swapped on the PCB?? (c24, c26, c28, c25)
Title: S800 Support Thread
Post by: bigswole on October 19, 2008, 02:31:53 PM
are there any files for us self etchers?  Help peterc.
Title: S800 Support Thread
Post by: Tungstengruvsten on October 23, 2008, 10:06:17 AM
Hmmm, the dual 100k rlog pots from Slenderchaps kits don't fit on the PCB...I thought the stereo version allowed the pots to mount to the PCB?  DId I mis-read that?

Also - just to confirm - the burgundy coloured 1k5 resistor - is it a 1 watt meant for r43?
Title: S800 Support Thread
Post by: Slenderchap on October 23, 2008, 10:27:56 AM
The burgundy resistor is indeed 1W

Can you clarify exactly what the problem is with the pots.... the PCB was designed to take these pots directly so they should be a perfect fit...

Anyone else had problems with the fit of the pots ?

Colin
www.audiomaintenance.com
Title: S800 Support Thread
Post by: Benny on October 23, 2008, 10:29:34 AM
Yup, the stereo pots did not fit into my boards, aswell.
But i just bent the legs a bit and everything was perfect.  :thumb:
Title: S800 Support Thread
Post by: Tungstengruvsten on October 23, 2008, 11:10:27 AM
if the back legs on the stereo pots came off of the other side of the 'wafer' they are mounted on it would line up - looks like they can be bent into place...i'll give that a try...
Title: S800 Support Thread
Post by: peterc on October 23, 2008, 11:16:17 AM
The back legs of the dual pots need to be bent slightly to fit the holes.

First page updated.

Peter
Title: S800 Support Thread
Post by: bluezplaya on October 23, 2008, 09:19:39 PM
I ordered 4 boards and they came in the mail the other day. I stuffed 2 for starters to hear what they sound like. I just wired up the first one and patched it in on some vocal playback. Everything seems to be working as it should, however, the more I boost the H, HM, and LM the more distrorted the signal gets. So I backed down the input signal going in and it seemed to help but there is still a bit of grainy-ness when I boost all the way.

Is this typical of this EQ? Right now I am using the PeterC PSU at +-15v but plan on getting +-18v out of it. Could this be a lack of headroom?

Adam
Title: S800 Support Thread
Post by: AJMAC on October 24, 2008, 12:15:40 AM
where (db of boost) does the distortion become audible, and how much distortion are we talking? (I know this is somewhat relative, just curious)
Title: S800 Support Thread
Post by: bluezplaya on October 24, 2008, 01:17:11 AM
Almost all the way (12-15 db). It's not so much distortion as it is overly resonant in those frequencies.
Title: S800 Support Thread
Post by: matta on October 24, 2008, 02:20:13 AM
Quote from: "bluezplaya"
Almost all the way (12-15 db). It's not so much distortion as it is overly resonant in those frequencies.


Did you set the on board TRIM pot for unity gain? If you haven'y you are probably causing the EQ to overload, hence the distortion.

Send a signal via a generator at a known value, say 1Khz, +4dBu or 1.23V into the unit and measure the output... it should be equal to that of the input, when it does, you have unity gain.

Cheers

Matt
Title: S800 Support Thread
Post by: bluezplaya on October 24, 2008, 10:34:54 AM
Quote
Send a signal via a generator at a known value, say 1Khz, +4dBu or 1.23V into the unit and measure the output


So let me get this straight, feed 1k audio signal into the input jack and measure the output jack for DC volts with a DMM to match the input?

BTW, have you seen my latest post on the Rev. D thread?
http://www.groupdiy.com/index.php?topic=20058&postdays=0&postorder=asc&start=645
Title: S800 Support Thread
Post by: bluezplaya on October 24, 2008, 10:50:11 AM
Does the EQ need to be engaged or bypassed?
Title: S800 Support Thread
Post by: Baltimore on October 24, 2008, 12:08:43 PM
Quote from: "bluezplaya"
Almost all the way (12-15 db). It's not so much distortion as it is overly resonant in those frequencies.


Never worked on a trident, eh?  thats the EQ.  Nothing wrong.

This is NOT one of those EQs you can boost forever and still have it sound good.  a little goes a long way and it KILLS on electric guitars and can be very cool on snares and toms.

of course, setting it up for unity can't hurt.
Title: S800 Support Thread
Post by: bluezplaya on October 24, 2008, 01:12:14 PM
Quote from: "Baltimore"
Quote from: "bluezplaya"
Almost all the way (12-15 db). It's not so much distortion as it is overly resonant in those frequencies.


Never worked on a trident, eh?  thats the EQ.  Nothing wrong.

This is NOT one of those EQs you can boost forever and still have it sound good.  a little goes a long way and it KILLS on electric guitars and can be very cool on snares and toms.

of course, setting it up for unity can't hurt.


No I haven't. Well I'm glad you cleared that up for me. I did notice that boosting only a little helped it a lot. I can see where the guitars would sound sweet! BTW, weren't some of the late Zeppelin albums mixed on this desk?  :wink:
Title: S800 Support Thread
Post by: matta on October 24, 2008, 02:04:08 PM
Yes, but GRAINY and DISTORTED are 2 very different things.... if you EQ is distorting or clipping, you have not set your unit up to run at unity gain and the input source is being over amplified... follow my directions if you want to  avoid this.

TO make it even EASIER if you have a software DAW, say Pro Tools, just send a balanced Signal Generator tone out of PT into the EQ and back into your PT interface and visually take a look and see if they match up... if not adjust until they do.

Cheers

Matt
Title: S800 Support Thread
Post by: bluezplaya on October 24, 2008, 02:06:35 PM
I use Nuendo. I'm assuming I have a tone generator plugin somewheres.
Title: S800 Support Thread
Post by: Holger on October 24, 2008, 06:27:55 PM
Quote from: "bluezplaya"
I use Nuendo. I'm assuming I have a tone generator plugin somewheres.

A Nuendo user in the US?  :wink:
You should have a tone generator functionality somewhere AFAIR...
(sorry for being off topic)
Title: S800 Support Thread
Post by: Baltimore on October 24, 2008, 07:11:55 PM
Quote


Never worked on a trident, eh?


I just re-read this and feel like I sounded a bit jerkish, which was certainly not intended, I was just typing in haste.  

Yes, definitely set up for unity and make sure the unit isn't clipping.

this eq is very obvious sounding, I find I limit my boosts to 3db or so.  Extreme settings can sound pretty nasty.
Title: S800 Support Thread
Post by: bluezplaya on October 24, 2008, 11:39:52 PM
You weren't jerkish at all  :guinness:  I HAVEN'T mixed on a Trident. I think the EQ sounds great and could sound really cool on some things when boosting the crap out of a frequency.
Title: S800 Support Thread
Post by: Brolik on October 26, 2008, 01:22:07 PM
Hey guys, noob here (I'm one of those wire-by-number guys I always read about).  I'm building an 8 channel unit as my first big project (I know, I know, a pretty steep ramp), and I've almost finished wiring up my first card but I've come to the end of my rope at the wiring of the 3 pole bypass switch.  Can someone aid me in translating the 4 pole from the schematic and layout to the one I have for purushas case?  Also, what are you guys using for the heat sink on Peters power supply?  I know its gotta be big, but how big?  Thanks in advance for your help.  I would never have gotten this far without all the help and hard work you guys put in.

Matthew Sommer
Title: S800 Support Thread
Post by: Siegfried Meier on October 27, 2008, 06:08:07 PM
Quote from: "peterc"
>>

>> C25 : SCH=100nf  :  PS=100nf film : pcb=100uf electrolytic with round space and polarity marker

>> C28 : SCH=470uf elec : [email protected] elec : PCB=100uf electrolytic with round space and polarity marker

>>C26 : [email protected] elec : [email protected] : PCB 100nf with small rectangle box

Designations for the electrolytics & bypass film caps swapped around.

Peter


I'm confused now...are we supposed to go with what is shown on the PCB?  Or are you saying the PCB silkscreen is wrong?

Also, I'm confused by the two R2's, and the R3o silkscreen that is beside one that says 5k6 - is this supposed to be R30?  So, according to the BOM, are there supposed to be ten 47's, and not nine?

Thanks,
Sig
Title: S800 Support Thread
Post by: matta on October 27, 2008, 06:31:06 PM
Quote from: "Siegfried Meier"
I'm confused now...are we supposed to go with what is shown on the PCB?  Or are you saying the PCB silkscreen is wrong?


The Silkscreen is FINE, it just doesn't match up to the schematic in that those caps are SWAPPED around (C25/C26), but since they are the bypass caps across the lyrics it doesn't matter... just follow the PCB silkscreen.... the schematic says C28/C30 are 470uF, but are marked on the PCB as CPSU 100uF... the parts in Colin's kits were 100uF, I'm sure these will work fine unless Peter says otherwise...

Quote from: "Siegfried Meier"
Also, I'm confused by the two R2's, and the R3o silkscreen that is beside one that says 5k6 - is this supposed to be R30?  So, according to the BOM, are there supposed to be ten 47's, and not nine?


No, that is supposed to be R3a, whose value is 5K6. There is only one R2 that I can see?

Cheers

Matt
Title: S800 Support Thread
Post by: Siegfried Meier on October 27, 2008, 06:34:16 PM
Oh, that says R3a...ok I get it now.  There is an extra R2 just above that though, right where it says 47k.  The other R2 that's 47k is right below R1 at 47k...
Title: S800 Support Thread
Post by: Siegfried Meier on October 27, 2008, 06:37:14 PM
Oh wait...I'm guessing that is supposed to be R27...silkscreen was cut off with the hole of the resistor.

So, there's 10 in total then, including R46, which is not marked on the BOM.

Thanks!
Sig
Title: S800 Support Thread
Post by: Siegfried Meier on October 27, 2008, 08:55:38 PM
I assume the resistors marked Lk mean link?  And with Colin's kits, that means to use the 0 ohm resistors?

Thanks,
Sig
Title: S800 Support Thread
Post by: matta on October 28, 2008, 01:44:54 AM
Quote from: "Siegfried Meier"
I assume the resistors marked Lk mean link?  And with Colin's kits, that means to use the 0 ohm resistors?

Thanks,
Sig


Your assumption is correct  :thumb:

Matt
Title: S800 Support Thread
Post by: peterc on October 28, 2008, 02:24:28 AM
Sorry for the confusion, the silkscreen is pretty much the plan to follow.

Peter
Title: S800 Support Thread
Post by: Siegfried Meier on October 28, 2008, 10:45:33 AM
Awesome, thanks guys!  BTW, these boards rock to solder on.  I don't know what it is, but it's just so...silky and smooth...
Title: S800 Support Thread
Post by: Hammond on October 30, 2008, 01:35:55 PM
Sorry for the stupid question, but what's the difference from using 0 ohm resistors or just a piece of wire?

Live long and prosper.
Title: S800 Support Thread
Post by: Slenderchap on October 30, 2008, 01:51:47 PM
No difference.... I just thought you would like them in the kit as it is easier to fit them and they cost almost nothing.... if you choose to use wire it should ideally be insulated...

Colin
www.audiomaintenance.com
Title: S800 Support Thread
Post by: Dr nEon on November 10, 2008, 12:55:00 PM
Hi all!

Quick question , guys:  How critical is the value of  R7...the 23k7 resistor ?

I can get 23k5 from RS , here in the uk (almost £1 each!)   or I suppose another option would be paralleling two 47k's which would be a lot cheaper , if the circuit design doesn't mind..

What are y'all doing about this resistor?

Cheers

nEon.
Title: S800 Support Thread
Post by: Brolik on November 10, 2008, 01:11:45 PM
hey peter,

I remember you saying that we would need BIG heat sinks for the regulators on your PSU if using it to power 8 channels of the s800.  Big enough that I should mount them off the pcb? or will the biggest heatsink I can fit on the board cut it you think?  If this isn't the right thread then I'm sorry, I'll make a different one.  Thanks.

Matt
Title: S800 Support Thread
Post by: peterc on November 10, 2008, 02:47:06 PM
Neon

2 x 47k's in parallel will be fine.

Brolik

I did an 8 chan Green  with a single PSU & I used a lump of aluminium about 50 x 25 x 5mm & it got HOT! Worked fine for a good few months but I then mounted the regs on the chassis for longevity's sake.

Bear in mind that the current draw for the S800 should be less per channel than the Green

Peter
Title: S800 Support Thread
Post by: mrphotodude on November 11, 2008, 08:27:23 AM
do you think it would be worth it to use TLE2071 over TL071's?
tl071's are 25 cents...the tle2071's are 1.50 each....

If there isnt not a night and day difference, i wouldn't bother.
i have some burr browns laying around to try out for the 5532 spot...
Title: Re: S800 Support Thread
Post by: Baltimore on November 12, 2008, 12:09:06 AM
do you think it would be worth it to use TLE2071 over TL071's?
tl071's are 25 cents...the tle2071's are 1.50 each....

If there isnt not a night and day difference, i wouldn't bother.
i have some burr browns laying around to try out for the 5532 spot...

I personally wouldn't bother with either, unless you dont want it to sound like a trident.  the 80 eqs are famous for a reason.  Why mess with it?   
Title: Re: S800 Support Thread
Post by: mrphotodude on November 12, 2008, 01:41:08 AM
rock on.
it seems like a pretty forgiving design.
Title: Re: S800 Support Thread
Post by: stitch-o on November 20, 2008, 10:59:44 AM
very quick question:

the 8200 and 3300pf styrene caps at C5 & C6->is there a specific polarity?
the parts in Collin's kit seem to have a blue designation for positive side on the part but I
can't seem to find this answer...

Thanks again for this project.

Cheers!
Title: Re: S800 Support Thread
Post by: Slenderchap on November 20, 2008, 11:53:43 AM
Polystyrenes are unpolorised....

Colin
www.audiomaintenance.com
Title: Re: S800 Support Thread
Post by: stitch-o on November 20, 2008, 12:08:44 PM
Polystyrenes are unpolorised....

Colin
www.audiomaintenance.com
*thumbs up*

thanks for putting the parts kits together too!
Title: Re: S800 Support Thread
Post by: kenrinc on November 20, 2008, 01:41:26 PM
Anybody do a front panel layout for this?  I'm doing a 1u 2ch unit and have a chassis but haven't done the layout.  If not I guess I'll go ahead and spend the time on it.  If anyone knows the center to centers on all the pots that would be helpful.

Ken-
Title: Re: S800 Support Thread
Post by: Siegfried Meier on November 22, 2008, 11:45:39 PM
Is there a BOM for your PSU Peter?  Been searching and not finding it...some things are hard to read on the silkscreen as they get cut off.

Thanks!
Sig

EDIT - Found it here: http://www.twin-x.com/groupdiy/displayimage.php?album=random&cat=10096&pos=-1394 (http://www.twin-x.com/groupdiy/displayimage.php?album=random&cat=10096&pos=-1394)

Title: Re: S800 Support Thread
Post by: nhaudio on November 23, 2008, 07:40:34 AM
I think this is what you're looking for:


http://1176neve.tripod.com/id26.html (http://1176neve.tripod.com/id26.html)


cheers,

Nico
Title: Re: S800 Support Thread
Post by: RedNoise on December 04, 2008, 10:58:57 AM
Do everybody goes with collin kits??Or is there a bom laying around please??
I just received my 8ch case , can't wait to start solderin' !!
Cheers!
Title: Re: S800 Support Thread
Post by: Siegfried Meier on December 04, 2008, 11:41:50 AM
Colin's kit rawk.  And he's a really handsome guy too.

Do the right thing.
Title: Re: S800 Support Thread
Post by: RedNoise on December 04, 2008, 11:47:42 AM
Thx "Sig"...I was hesitatin' , now no doubt is subsisting!!!Ahahahahaaa!!!
 ;D
Title: Re: S800 Support Thread
Post by: matta on December 04, 2008, 12:28:19 PM
Another thumbs up for Colin's kits, great parts, great service... have no idea what he looks like, but who cares! Do the right thing... buy his kit  ;D

Matt
Title: Re: S800 Support Thread
Post by: RedNoise on December 04, 2008, 12:31:00 PM
I don't doubt he's a good guy , I was just wonderin about the price ...but...much easier , and as I'm noob...Thanks guyz!!
Title: Re: S800 Support Thread
Post by: matta on December 04, 2008, 01:02:14 PM
I don't doubt he's a good guy , I was just wonderin about the price ...but...much easier , and as I'm noob...Thanks guyz!!

Match like with like... Colin's kits contain the BEST of the BEST RE brands and components, most are British made and only the highest quality, try see if you can get em cheaper on a small run... plus as you shared the the convenience factor is great.I had to build multiple channels and the thoughts of getting ALL the parts verses the time saving and quality made it all worth it.

Here is a pic of my first prototype built from Colin's kits.

(http://www.matt-allison.com/diy/S800/S800_Eq_Proto.jpg)

I just received my next 8 kits from him today!

Cheers

Matt


Title: Re: S800 Support Thread
Post by: RedNoise on December 04, 2008, 01:30:51 PM
Colin send me a "brand" list...I'll order him asap!
 ;D
Title: Re: S800 Support Thread
Post by: matta on December 04, 2008, 04:43:51 PM
Colin send me a "brand" list...I'll order him asap!
 ;D

Lifted this from the S800 EQ thread in the 'Black Market'.

Quote
Kit AML-17-011 contains;
Resistors - Vishay MRS25 1% metal film 0.6w and PR01 1W
Capacitors;
Electrolytic - Dubilier (type used on AMEK 9098i)
Polyester Film - Dubilier (except 100nF which are "unbranded")
Polystyrene - LCR Capacitors FSCEX series
Ceramic - "unbranded"
IC's - Texas instruments TL071CP and NE5532AP
IC sockets - Tyco (turned pin)
Pots - Omeg co-polymer track 10%
Trimmer - Vishay
Zero ohm links - TruOhm carbon 1/4W

Hope that helps!

Matt
Title: Re: S800 Support Thread
Post by: Slenderchap on December 05, 2008, 05:29:20 AM
At the request of forum members the Alps switch was removed from the kit and the price reduced accordingly (not used with Purusha's case?).

Colin
www.audiomaintenance.com
Title: Re: S800 Support Thread
Post by: RedNoise on December 05, 2008, 05:30:09 AM
thx Matta , my poor english is reachin it's limits...
I meant "sent" ....
BTW thx.
T.
Title: Re: S800 Support Thread
Post by: Tungstengruvsten on December 06, 2008, 04:39:13 PM
ok i've got purushas 2 chnl case and a stuffed board in front of me - call me crazy but does the PCB with switches on board go in upside down?  This keeps the HF switch/LF switch at the right ends, and the bypass switch at the right end...is this mentioned anywhere? am I nuts?  I'm looking at the layout in red/blue here:
http://www.groupdiy.com/index.php?topic=29759.20
and it looks like the board has to be flipped to have the HF on the right hand side... ???
Title: Re: S800 Support Thread
Post by: matta on December 06, 2008, 05:00:14 PM
Yes, the board goes in upside down, the traces facing the top of the rack... it was designed with that in mind  ;D Sorry if my drawing is confusing in that regard. Since you have a rack and the rest of us are waiting, do the pots line up the way they should, i.e onboard?

Cheers

Matt
Title: Re: S800 Support Thread
Post by: Tungstengruvsten on December 06, 2008, 05:09:14 PM
yup all's well!  Make sure you use flush cutters on the first row of potentiometer pins, otherwise they will touch the  metal mounting bracket.  I put a strip of electrical tape there as well. 
Title: Re: S800 Support Thread
Post by: matta on December 06, 2008, 05:22:17 PM
yup all's well!  Make sure you use flush cutters on the first row of potentiometer pins, otherwise they will touch the  metal mounting bracket.  I put a strip of electrical tape there as well. 

Good to hear it! Now hurray up and finish and post some sluty pics, LOL!

Matt
Title: Re: S800 Support Thread
Post by: Hammond on December 06, 2008, 05:25:36 PM
what are the parts that have to be left out in the green psu if no 48v is needed ?
Title: Re: S800 Support Thread
Post by: matta on December 06, 2008, 05:43:52 PM
what are the parts that have to be left out in the green psu if no 48v is needed ?

Leave out all the parts in the YELLOW block.

(http://www.matt-allison.com/diy/S800/S800_EQ_PSU.gif)

Cheers

Matt
Title: Re: S800 Support Thread
Post by: peterc on December 07, 2008, 12:10:04 AM
Thx Matta!
Title: Re: S800 Support Thread
Post by: Hammond on December 07, 2008, 05:37:47 AM
Thanks Matta!  ;D
Title: Re: S800 Support Thread
Post by: substitute on December 09, 2008, 12:37:30 AM
Hey all,
I wanted to ask a few questions before my boards and kits get here...

-The kits do not include PSU components or jacks, correct?
-The PSU is the same as the green mic pre, so that BOM mentioned earlier will get me where I need to go, right?
-There's no front panel layout yet, affirmitive?

Thanks
Title: Re: S800 Support Thread
Post by: matta on December 09, 2008, 01:39:42 AM
-The kits do not include PSU components or jacks, correct?

Correct, they also do not include the Moulex headers and ALL switches.

-The PSU is the same as the green mic pre, so that BOM mentioned earlier will get me where I need to go, right?

Correct, not looked at the BOM but the original BOM will have the parts to set the PSU to 15VDC rails, you can swap out 2 resistors and push it up to 18VDC for a little more headroom if you want.

-There's no front panel layout yet, affirmitive?

Not in FPD at least, not that I'm aware of, but Purusha did makes both 1U 2 channel and 4U 8 channel rack cases.

Cheers

Matt
Title: Re: S800 Support Thread
Post by: geoff004 on December 09, 2008, 07:49:26 AM
Could someone post a picture of how the bypass switch translates to the 3PDT switch?

Thanks in advance
Title: Re: S800 Support Thread
Post by: RedNoise on December 09, 2008, 08:26:12 AM
Could someone post a picture of how the bypass switch translates to the 3PDT switch?

Thanks in advance

+1 !!!thx.
Title: Re: S800 Support Thread
Post by: matta on December 09, 2008, 08:52:15 AM
When I get a chance I'll do so, stuck in sessions at the moment... if someone else has time they can. but I'll do it when I get a chance.

Matt
Title: Re: S800 Support Thread
Post by: sintech on December 09, 2008, 09:45:02 AM
When I get a chance I'll do so, stuck in sessions at the moment... if someone else has time they can. but I'll do it when I get a chance.

Matt

The PCB is designed for a switch with two rows of six contacts, from the front (pot mounting edge):

Row two switches to either, row one (out) or row three (in) likewise for row five, switches between row four or row six.

Not all poles are needed, the three poles are:

1, Both sides of row two only needs to switch to row three. (switch on position)

2, Row five needs only to make contact with row four on one side (right from the pot mounting edge) (switch off position)

I wish I could use a graphics program! hehehehehe
Title: Re: S800 Support Thread
Post by: matta on December 09, 2008, 10:08:23 AM
When I get a chance I'll do so, stuck in sessions at the moment... if someone else has time they can. but I'll do it when I get a chance.

Matt

The PCB is designed for a switch with two rows of six contacts, from the front (pot mounting edge):

Row two switches to either, row one (out) or row three (in) likewise for row five, switches between row four or row six.

Not all poles are needed, the three poles are:

1, Both sides of row two only needs to switch to row three. (switch on position)

2, Row five needs only to make contact with row four on one side (right from the pot mounting edge) (switch off position)

I wish I could use a graphics program! hehehehehe


Hey Sintech,

This I know, but looking at the PCB it is  matter of determining which poles go where in relation to the PCB as it is laid out for an onboard push button switch, which has 2 rows of 8, unlike a 3PDT toggle switch which has 3 rows of 3, which as you shared switch from row 1 between and 3, or 4 and 6 and 7 and 9.

(http://www.matt-allison.com/diy/S800/S800-EQ-OVERLAY.jpg)

(http://rocky.digikey.com/weblib/ITT%20Cannon/Web%20photos/7301SYZQE,%207303SYZQE,%207305SYZQE.jpg)

But how do these relate to the PCB... I'm still working it out for myself, if we can get it in words I'll knock up the picture  ;D

Cheers

Matt
Title: Re: S800 Support Thread
Post by: sintech on December 09, 2008, 10:39:56 AM
When I get a chance I'll do so, stuck in sessions at the moment... if someone else has time they can. but I'll do it when I get a chance.

Matt

The PCB is designed for a switch with two rows of six contacts, from the front (pot mounting edge):

Row two switches to either, row one (out) or row three (in) likewise for row five, switches between row four or row six.

Not all poles are needed, the three poles are:

1, Both sides of row two only needs to switch to row three. (switch on position)

2, Row five needs only to make contact with row four on one side (right from the pot mounting edge) (switch off position)

I wish I could use a graphics program! hehehehehe


Hey Sintech,

This I know, but looking at the PCB it is  matter of determining which poles go where in relation to the PCB as it is laid out for an onboard push button switch, which has 2 rows of 8, unlike a 3PDT toggle switch which has 3 rows of 3, which as you shared switch from row 1 between and 3, or 4 and 6 and 7 and 9.

(http://www.matt-allison.com/diy/S800/S800-EQ-OVERLAY.jpg)

(http://rocky.digikey.com/weblib/ITT%20Cannon/Web%20photos/7301SYZQE,%207303SYZQE,%207305SYZQE.jpg)

But how do these relate to the PCB... I'm still working it out for myself, if we can get it in words I'll knock up the picture  ;D

Cheers

Matt


Hey Matta:

PCB  pads:

6a-6b

5a-5b

4a-4b

3a-3b

2a-2b

1a-1b

---Front Panel side---

Toggle solder side (B is switched to either A or C)

A1-A2-A3

B1-B2-B3

C1-C2-C3


Ok:

 Toggle B1-->  PCB 2a

Toggle B2 - -> PCB 2b

Toggle C1 --> PCB 3a

Toggle C2 -->  PCB 3b

Toggle B3 -->  PCB 5b

Toggle A3 -->  PCB 4b
Title: Re: S800 Support Thread
Post by: substitute on December 09, 2008, 12:50:55 PM
Wow, that's a lot for my coconut...

Matta, what is this Moulex header you mentioned?
Title: Re: S800 Support Thread
Post by: matta on December 09, 2008, 03:12:42 PM
Sintech,

Thanks for the thorough description, as promised here is the drawing:

(http://www.matt-allison.com/diy/S800/3DPT-Switch.jpg)

I've tested it as working before anyone worries they may blow something up, Hah Hah.

Hopefully that will help the more pictorially minded overcome this hurdle  :D

RE the Moulex Header, it is just that, it allows for you to easily disconnect any of the i/o's or PSU if repair work needs to be done, without have to cut/desolder wires, see the pic below:

(http://www.matt-allison.com/diy/S800/S800_Eq_Proto.jpg)

Cheers

Matt



Title: Re: S800 Support Thread
Post by: RedNoise on December 09, 2008, 03:51:31 PM
thumb!!!
thx Matta!!
Title: Re: S800 Support Thread
Post by: substitute on December 09, 2008, 05:12:43 PM
Well done sir, well done indeed
Title: Re: S800 Support Thread
Post by: Siegfried Meier on December 11, 2008, 09:37:00 PM
RE the Moulex Header, it is just that, it allows for you to easily disconnect any of the i/o's or PSU if repair work needs to be done, without have to cut/desolder wires, see the pic below:

Unfortunately, those of us with the 8 channel case have no choice really than to solder wires to each module and to the pots, so repair work will be a little bit more difficult...not a big deal though.

How are you guys grounding?  Input XLR of each channel connected together to star ground of the IEC?

Thanks,
Sig
Title: Re: S800 Support Thread
Post by: matta on December 12, 2008, 04:13:13 AM
Unfortunately, those of us with the 8 channel case have no choice really than to solder wires to each module and to the pots, so repair work will be a little bit more difficult...not a big deal though.

How are you guys grounding?  Input XLR of each channel connected together to star ground of the IEC?

Thanks,
Sig


Hey Sig,

I'm also building an 8 channel, I still think having the XLR's and PSU on Moulex will help if you have o do repairs other wise you have to cut off/desolder the XLR/PSU wires, yeah the switches and pots are off board but it will still allow for easier servicing in time.

Cheers

Matt

Title: Re: S800 Support Thread
Post by: Siegfried Meier on December 12, 2008, 10:01:48 AM
Oh ya, I'm definitely also using molex connectors for the XLR's and PSU - should have said that.

Can anyone comment on the grounding scheme?

Thanks,
Sig
Title: Re: S800 Support Thread
Post by: inputoutput on December 13, 2008, 05:31:10 AM
(http://www.kaada.no/DIY/DIY-trident/wrongroom-trident-01.jpg)

(http://www.kaada.no/DIY/DIY-trident/wrongroom-trident-02.jpg)

(http://www.kaada.no/DIY/DIY-trident/wrongroom-trident-03.jpg)

Not completely done yet, but enough to show&tell. The EQ sounded dirtier than expected. Lot´s of character, and really fun to play around with.

as for the calibration, the trimpot should be fairly close to 5K. - which is the mid value. So there´s not much turning needed there.

lower mid sweep goes from aprox 180 to 2K (and not 100hz to 1k5 as the front says).  upper mid - goes from 2K and all the way up to 20K+   So if you are gonna make your own front, these are better numbers compared to the standard RC.

the HP switch has a very musical rolloff, sounds great and starts at around 100hz

Will try some different caps types on the lower mid freqs. Thought they sounded a bit sloppy. Dont remember the name of those caps-types.   The other freqs sounds cool.  - where mostly Wimas are used.

There´s still a small 100hz hum going at -89db.  mmmm,  well. Probably caused by an over-dimensioned toroid (!!). Will get a new one, and put it in a proper case.  For the power-supply I´ve used one of JLMs psu-board.   will follow any post here about the grounding of the S800 with great interest.

------

Had most of the parts in stock already. They are from all over the place. But the knobs and some of the caps are from Banzai.  The big on/off button is from an old tapemachine

----


Big thanks to Collin for the pots, and of course an even BIGGER thanks to PeterC !!!!!


Title: Re: S800 Support Thread
Post by: matta on December 13, 2008, 01:30:39 PM
Quote
How are you guys grounding?  Input XLR of each channel connected together to star ground of the IEC?

That is how I plan on doing mine.

Congrats to inputoutput, I think you have posted the first completed unit... well almost completed, just got to rack em up  ;D

Back to some more helpful info.

It seems that the following rings true RE the SPDT switches:

High Freq
Switch In = 8K
Switch Out = 12K

Low Freq
Switch In = 60Hz
Switch Out = 120Hz

Low Cut
Switch In = Bypass
Switch Out = 50Hz Cut

This has been tested by ear with my prototype... but hey, my ears may not be all that great  ;)

Matt
Title: Re: S800 Support Thread
Post by: RedNoise on December 13, 2008, 02:23:10 PM
Plowwwwww!!!!InpoutOutput : what a beautiful front panel!!!Bigup!!!
Did you use Panasonic audio (electro caps)??
I really appreciate the report!
Thx.
Title: Re: S800 Support Thread
Post by: jarlehal on December 13, 2008, 04:46:26 PM
NYDELIG :) Wonderful front panel!!
Title: Re: S800 Support Thread
Post by: inputoutput on December 13, 2008, 04:55:07 PM
yes, those are panasonics. 

For the filters I would highly recommend Wimas. A/B tesed a few other types of filmcaps on one of the boards, and the Wimas felt better. Compared left/right up against each-other. wimas ruled among those I had available.

Got the yellow 8n2 cap from Banzai.

I´ve actually also tested tantalums on the 22uF spot. Difficult to hear any difference. tants are cool, and I do actually miss them, cause they look better... mmm

I´m quite thrilled at the moment. Just found a cute small 24V toroid in my closet, which fitted inside the case. No need for an external PSU anymore.

star-grounded everything, and when I lowered the +V the hum almost went completely away!  On one side it disappeared. Seems like it is a good idea to adjust the voltages as a part of the calibration-process. There was a "golden spot" where the hum was at its lowest.
Title: Re: S800 Support Thread
Post by: substitute on December 14, 2008, 08:19:09 PM
inputoutput, sooooo slick!  Will the PSU be external?  And how deep is that chassis?
Title: Re: S800 Support Thread
Post by: substitute on December 14, 2008, 10:29:01 PM
Does any one have part numbers for the pots?  They seem to be eluding me.
Title: Re: S800 Support Thread
Post by: dissonantstring on December 15, 2008, 12:52:17 PM
hi substitute,
contact colin at audio maintenance he has the pots for this project (he migh still have the entire kit which makes things extremely easy).  very fast shipping too.
and colin is very kind and helpful. :)
regards,
grant
Title: Re: S800 Support Thread
Post by: substitute on December 15, 2008, 10:41:06 PM
Thanks, my kits from Colin actually showed up today.  For some reason I got the mistaken impression that the pots weren't included.  Hopefully I won't overlook the obvious too many more times...
Title: Re: S800 Support Thread
Post by: Knarleybass on December 16, 2008, 12:55:39 AM
I am getting parts together for the Green PSU,
 would this toroid work for an 8 Channel s800 eq?

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=TE51402018-ND

thanks

Howard
Title: Re: S800 Support Thread
Post by: Siegfried Meier on December 16, 2008, 01:40:58 AM
I am getting parts together for the Green PSU,
 would this toroid work for an 8 Channel s800 eq?

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=TE51402018-ND

thanks

Howard

$103??????  You gotta be kidding me man.  Do yourself a favour, and read this entire thread.  You'll find the info you need.

Sig
Title: Re: S800 Support Thread
Post by: Knarleybass on December 16, 2008, 12:52:00 PM
-The kits do not include PSU components or jacks, correct?

Correct, they also do not include the Moulex headers and ALL switches.

-The PSU is the same as the green mic pre, so that BOM mentioned earlier will get me where I need to go, right?

Correct, not looked at the BOM but the original BOM will have the parts to set the PSU to 15VDC rails, you can swap out 2 resistors and push it up to 18VDC for a little more headroom if you want.

-There's no front panel layout yet, affirmitive?

No

Can you tell me what resistors to swap out to make it +/-18 volts?
Title: Re: S800 Support Thread
Post by: Brolik on December 16, 2008, 05:04:29 PM
I switched the 2k2s to 2k7s and got 18.25v on one side and 18.35v on the other.  The formula for the regulators spit out much closer to 3k, but the 2k98 i used gave me over 19v.
Title: Re: S800 Support Thread
Post by: wolfgang on December 17, 2008, 10:29:20 AM
Quote
lower mid sweep goes from aprox 180 to 2K (and not 100hz to 1k5 as the front says).

Hello!

Just measured mine and LMF goes from 100Hz to 800Hz. So i am missing half of the range up to 1k5!!
The other bands work like they should!! Do i have a fault at C11/12 or R18/19 ???


Has anybody else measured the bands already?

Any ideas are welcome!!

Thanks,
Wolfgang
Title: Re: S800 Support Thread
Post by: Dr nEon on December 18, 2008, 12:03:08 PM
very quick question:

the 8200 and 3300pf styrene caps at C5 & C6->is there a specific polarity?
the parts in Collin's kit seem to have a blue designation for positive side on the part but I
can't seem to find this answer...


Polystyrenes are unpolorised....

Colin
www.audiomaintenance.com


True , but the band on the part designates the outside of the foil , if i'm correct. I've read that in some designs it is necessary to respect the correct orientation of the 'inner' and 'outer' ends of the cap...

On the S800 PCB,  each polystyrene is allocated a round pad and a square pad , suggesting that in this circuit there is a preferred/suggested way to connect these caps.

Can anyone confirm if this design is fussy about that, and if so , which way around is correct?!

Cheers

nEon



PS just found this,from the main man:


If it has a band on one end, that is the Outside Foil. It will work either way, but maybe less stray capacitance if the outside foil goes to the less sensitive side of the cap. If one leg is grounded, outside foil should go to ground. If one side goes to an opamp output, outside should usually go there. But considering the typical size of a 120pF cap, it probably does not matter.
Title: Re: S800 Support Thread
Post by: matta on December 20, 2008, 05:29:02 AM
Hey Guys,

Hopefully these pics will inspire you to get your EQ's done.... just finished my first today.

Purusha's cases are great but must warn you a PITA to work with RE trying to mount the front panels... the side where the BYPASS switch is is VERY tricky to mount and it doesn't help that the screws Purusha provided only have 3-4mm of thread to play with, maybe next time longer screws?

Another thing to be aware of is that pots are slightly recessed behind the PCB's so when mounting to the front panel it causes the thread to be misaligned, forcing the pots to pull up somewhat, making it a little harder to use the pots as the shaft catches with the front panel... a washer on the pot side should act as a spacer giving you straight pots that are free to friction.

(http://www.matt-allison.com/diy/S800/S800_Front.jpg)

(http://www.matt-allison.com/diy/S800/S800_Front_Close.jpg)

(http://www.matt-allison.com/diy/S800/S800_Insides.jpg)

(http://www.matt-allison.com/diy/S800/S800_Rear.jpg)

Unit is star grounded, XLR's grounded at PIN to chassis, NO hum/noise, VERY quiet unit even with the torrid closer than I would have liked...

Cheers

Matt






Title: Re: S800 Support Thread
Post by: natek on December 20, 2008, 05:40:30 AM
looks great matt!! Too bad about the little quirks on the design but it seems you created solutions for the issues! Wish mine was even close to being at that stage and it would be gettin some use!
Title: Re: S800 Support Thread
Post by: matta on December 20, 2008, 10:07:48 AM
Ok.... so here a re a few things that may help y'all....

As I shared above the pots don't fit that well with jut a nut and or even the OMEG lock washer as the PCB is wider than the pots so to solve this I purchased a couple spring washers from the hardware store... see the pic below, works like a charm!

(http://www.matt-allison.com/diy/S800/S800_washers.jpg)

Cheers

Matt
Title: Re: S800 Support Thread
Post by: Dr nEon on December 21, 2008, 02:57:29 PM

Great looking build there , Matta , as usual!

Did you just tie the input xlr pin 1's direct to chassis?

I'm thinking now about drilling my enclosure, and wondering if i need to implement an earth lift switch between pin 1 and chassis . It's something I've gotten into doing with my 1176 and GSSL , but maybe it isn't necessary in this case...sounds like yours is pretty clean...have you auditioned it in a chain with any other units yet?

I actually didn't do an earth-lift switch my calrec 1549, but that was mainly because I couldn't understand why that circuit has no xlr input to 0 volt connection anyway...

Cheers

nEon
Title: Re: S800 Support Thread
Post by: Hammond on December 21, 2008, 04:07:03 PM
The 100k dual gang pots should be linear or log?
Title: Re: S800 Support Thread
Post by: matta on December 21, 2008, 04:12:19 PM
Hi nEon,

I tied the Pin 1's at direct to the chassis as per the RANE doc. I've done this is every piece of DIY gear I've built with great success thus far, and I'm a stickler for noise... you can see some of my previous posts where others have said it is 'ok' and I've gone deeper in to lower noise/hum it in ALL my gear as best I can.

In my listening tests I've sent signals out of my Lynx Aurora AD/DA into the S800 and back through Pro Tools, no other additional bits, but would gladly do so if you think it will help the cause.

Also since I'm here... a few other words of caution.... if you mount the pots on board with Purusha's racks you BETTER cut off the excess length on the pot legs as they WILL short out... I cut them short and then just to be safe added electrical tape to the inside of the rack, even though there is 1-2mm's clearance, better be safe than sorry.

(http://www.matt-allison.com/diy/S800/S800_clearance.jpg)

(http://www.matt-allison.com/diy/S800/S800_tape.jpg)

Here is a pic of the boards from the component side mounted to the sub frame.... got to give a kudos to Colin again, bough his kits and they are great, great quality components and they sound great to boot.

(http://www.matt-allison.com/diy/S800/S800_PCB.jpg)

Quote
The 100k dual gang pots should be linear or log?

REV Log

Cheers

Matt
Title: Re: S800 Support Thread
Post by: Siegfried Meier on December 21, 2008, 05:58:31 PM
Hi nEon,

I tied the Pin 1's at direct to the chassis as per the RANE doc.

Am I understanding this correctly?  You went from the input XLR Pin 1 right to the screw of the XLR/chassis?  I can't see it in your pic, but that's what I usually do.

Thanks,
Sig
Title: Re: S800 Support Thread
Post by: matta on December 22, 2008, 08:32:18 AM
Hi nEon,

I tied the Pin 1's at direct to the chassis as per the RANE doc.

Am I understanding this correctly?  You went from the input XLR Pin 1 right to the screw of the XLR/chassis?  I can't see it in your pic, but that's what I usually do.

Thanks,
Sig

Correct... though in my case it is neater to solder Pin 1 to the chassis tab that the Ampehnol Connectors I use have. This in turn is connected too the shell, which is screwed to the chassis. I always use a dremel to take off the coating around the holes as well to make sure it meets the metal and then ohm it all out to be sure I've got full continuity between all ground points.

Cheers

Matt
Title: Re: S800 Support Thread
Post by: Dr nEon on December 22, 2008, 11:39:37 AM

Cheers Matta..mmm ..more nice pics!

Quote
great quality components and they sound great to boot

So you are diggin' those red dubliers for audio then?

They are really easy to get in the uk , and I must get around to trying a build using only that type of electro. Almost stuffed my first s800 , using elna stargets , and I have a matched 2nd board ready to go with FC's...also just got some of those metallic blue pana ECA series (very cheap) to try .

I thought the s800 looked like a nice neat little circuit to use as a test bed for all these caps ; I've read so many posts here discussing cap brands!

Thanks again for sharing the info!

Cheers

nEon.


Title: Re: S800 Support Thread
Post by: 3nity on December 22, 2008, 12:18:14 PM
First 2 boards completed over here...just watching the snow storm outside while doing some GREAT EQ's.

When i say great i mean 2 basic things....inexpensive and great sounding.

I couldnt afford the Audio Maintenance kits...so ended up with Small bear pots and sourcing the rest...locally.

i used Rubycons, Panasonic FC, Eros and vishay caps
i paid 35$ in parts for 4 eQ's + 4 pcbs....total 75$ for 4 great EQ's.

Just listened to the 1st and it sounds very nice...lots of colours and character!!

Tip my hat to JC and Peter C.
Title: Re: S800 Support Thread
Post by: Hammond on December 22, 2008, 02:11:42 PM
I thought the s800 looked like a nice neat little circuit to use as a test bed for all these caps ; I've read so many posts here discussing cap brands!

What where the original caps?
Title: Re: S800 Support Thread
Post by: Purusha on January 01, 2009, 08:17:05 AM
Nice work inputoutput and Matta!!!

I am glad all small problems can be solved around my cases. They usually are!  ;)

BTW Matta, I noticed you used ceramic caps instead of Styros in yours. Do I see this right?
Title: Re: S800 Support Thread
Post by: okgb on January 01, 2009, 08:29:48 AM
Hey matta  , or anyone else  , i noticed the 470 caps in Colins
kits are 16 v , not sure where the schematic is at the moment  , but
this voltage is o.k. for whatever part of the circuit it's in ?
Title: Re: S800 Support Thread
Post by: matta on January 01, 2009, 09:43:21 AM
Nice work inputoutput and Matta!!!

I am glad all small problems can be solved around my cases. They usually are!  ;)

BTW Matta, I noticed you used ceramic caps instead of Styros in yours. Do I see this right?

No I used styro's for the top bands, only ceramics are the feedback/compensation caps around the opamps, which is typical of most audio designs.

Greg, RE the voltage ratings of the 470uF's, the schematic calls for 6V here pretty sure 16V is ample. The 470uF's sit on the output of U1, not across the PSU rails.

RE schematics they are all in the Group DIY Gmail account.

Oh and HAPPY NEW YEAR ALL!

Cheers

Matt
Title: Re: S800 Support Thread
Post by: okgb on January 01, 2009, 10:56:50 AM
thanks matta , i first saw the decoupling on the psu / opamps in the bottom left corner of the schemo
but i see they are back to back to non polerize after the first opamp , but still makes for a big cap eh ?
Title: Re: S800 Support Thread
Post by: matta on January 01, 2009, 11:36:54 AM
thanks matta , i first saw the decoupling on the psu / opamps in the bottom left corner of the schemo
but i see they are back to back to non polerize after the first opamp , but still makes for a big cap eh ?

Indeed

Title: Re: S800 Support Thread
Post by: geoff004 on January 03, 2009, 08:39:44 PM
I just finished up a friend's S8001 (he built it, I de-bugged it)
Here are a couple little tips that I found:
Matta showed us all about cutting down the leads on the pots - make sure that you trim up all the ends of all the components.  My buddy had a bunch of things that got jammed in to the case, like the trim pot.  Chop it all short.

Make sure all your solder joints are good.  It seems like a no-brainer, but it can make all the difference.  Also with the 8-pin sockets, try to get them flat and snug into the PCB.  My buddy managed to solder a socket in but only actually solder in 7 of the 8 pins.

Finally, make sure all your caps and ICs are in the right direction.  Possibly the biggest no-brainer, but my friend managed to put his 5532 in backwards.  It actually melted the socket while going up in smoke.
Title: Re: S800 Support Thread
Post by: sintech on January 04, 2009, 08:17:38 AM
Completed S800-8, boy it's a tight squeeze! I gave up on the brackets that hold the PCB's as I just couldn't get my hands in!
(http://i44.photobucket.com/albums/f23/sin-tech/Front-1.jpg)
Back
(http://i44.photobucket.com/albums/f23/sin-tech/Back.jpg)
Powered for the first time
(http://i44.photobucket.com/albums/f23/sin-tech/Powered.jpg)
Top
(http://i44.photobucket.com/albums/f23/sin-tech/Top.jpg)
Guts
(http://i44.photobucket.com/albums/f23/sin-tech/Guts-1.jpg)
In great company as always :-)
(http://i44.photobucket.com/albums/f23/sin-tech/Inthestudio.jpg)
Title: Re: S800 Support Thread
Post by: inputoutput on January 04, 2009, 09:31:30 AM
nice stuffing!!!  congratz!

looks good





Title: Re: S800 Support Thread
Post by: Purusha on January 04, 2009, 02:25:45 PM
Good job Andy!!!

I admit, I could made a bit deeper cases... would not hurt.  :)
Title: Re: S800 Support Thread
Post by: natek on January 04, 2009, 02:27:46 PM
Very Nice Job! Let us know how it sounds... what will its purpose be a drum set EQ! ? :D
Title: Re: S800 Support Thread
Post by: Knarleybass on January 04, 2009, 02:37:08 PM
I switched the 2k2s to 2k7s and got 18.25v on one side and 18.35v on the other.  The formula for the regulators spit out much closer to 3k, but the 2k98 i used gave me over 19v.

I could use 5k trimmers in place of those 2.2k resistors and dial in the proper voltage?
Title: Re: S800 Support Thread
Post by: Brolik on January 04, 2009, 03:17:52 PM
Yup, just like mnats little psu for the dual 1176s
Title: Re: S800 Support Thread
Post by: Knarleybass on January 04, 2009, 03:24:26 PM
Good job Andy!!!

I admit, I could made a bit deeper cases... would not heart.  :)


I am starting on the power supply for my 8 Channel s800, and I am thinking on making external. There just isn't a lot of room in there.
Title: Re: S800 Support Thread
Post by: sintech on January 04, 2009, 04:22:57 PM
Very Nice Job! Let us know how it sounds... what will its purpose be a drum set EQ! ? :D

I love how musical this eq is, and this has been built with drums in mind :) my Audix console has really wide fixed point top and bottom and switchable upper and lower mids.. all good but it's very BBC safe and subtle. These do a little more damage.
Title: Re: S800 Support Thread
Post by: natek on January 04, 2009, 04:31:12 PM
I love how musical this eq is, and this has been built with drums in mind :)

Perfect thats what i was hoping you would say! It looks just right to be set up after an 8 channel Pre unit with the dums all running thru the pres then into the eq before tape! :) Very nice background racks by the way show us the racks back there some time!
Title: Re: S800 Support Thread
Post by: Kaspar on January 06, 2009, 05:10:56 PM
Would someone be kind enough to answer what is probably a dumb question.

I'm looking in my mouser catalog, trying to figure out what Molex connectors to order. I'm baffled  ???  Used them a couple of years ago on a GreenPre project but don't remember which kind. Looks like the through holes in the PCB are 3.5mm apart for the XLR connections and 5mm apart for the power connection. I don't understand the technical data, as it is laid out and none of the pin sizes seem to measure up correctly

Also, now that I think of it. Can someone recommend a Toroidal tranny. I had planned on using a Dagnall like the one I used in my GreenPre but it is no longer available at Newark.

Thanks

Kaspar
Title: Re: S800 Support Thread
Post by: substitute on January 06, 2009, 11:32:32 PM
An appropriate transformer is mentioned on page 1 or 2
Title: Re: S800 Support Thread
Post by: Brolik on January 06, 2009, 11:35:50 PM
Kaspar,
The 5.08 mm connectors are also .2 inches and the others are .125 or someting.  I had to drill the holes a little bigger to get mine to fit.  

Title: Re: S800 Support Thread
Post by: Kaspar on January 07, 2009, 12:09:11 AM
Thanks for the replies.
 ;D
Title: Re: S800 Support Thread
Post by: mitsos on January 08, 2009, 11:26:04 PM
Hey everyone... just starting to source my parts for my dual EQ. Two questions (one is about the toroid, don't flame me!) 

The only thing that gets me is the power trafo. I know there were someone mentioned using a 30VA, but if I counted up correctly, the all the ICs together use about 13mA (typical) to 26mA (MAX ) per channel (supply current)... if I read the datasheets right. Does that mean I could use a 2x15V 10VA trafo? Shouldn't this do 333mA per side? If that's correct, counting any other losses, that should be enough for two channels, right?  This is the first time I'm trying to calculate this and I would like to be sure.

Also, I just re-downloaded the docs from the gmail acct and saw that joel wrote "I'll ask Peter to add the traces, component layout, and overlay drawings shortly." Can/will these be made available? I'm going to order some parts from overseas and realize it will be cheaper to buy in quantity, so what to do with the leftovers than build more channels?  8)
Title: Re: S800 Support Thread
Post by: Davo on January 09, 2009, 12:24:51 AM
10va should be more than enough.... I can't seem to find the current draw, but Peter mentioned that the S800 draws less than the Green pre... and you can power 8 channels of that from a 15va.  If someone knows how much the S800 draws, I'd like to know as well.

Also, might wanna check out Colin's kits at AML.... just got mine in the mail... everything's there but the PSU parts, tranny and switches... good stuff!! ;D
Title: Re: S800 Support Thread
Post by: mitsos on January 09, 2009, 07:29:50 AM
Thanks for the reply. The only thing apparently drawing current are the ICs here. And the 71s draw next to nothing, the 5532 a hair more than nothing, that is, if I read the datasheet correctly. I looked at supply current?.?.?.?

I didn't know you could power 8 greens on 15VA! that's pretty cool!

I did get my pots from Colin but the rest of the stuff didn't make sense at the time. I have the resistors and some caps already... I would have liked to get some of those lytics he sells just because they look really cool, but it's easier for me to order from TAW... I get other stuff from there too.
Title: Re: S800 Support Thread
Post by: sintech on January 09, 2009, 04:00:23 PM
I would use a 50VA part for an 8 channel unit

Peter

Davo, Peter suggested 50VA for an 8 channel unit, 15VA feels a little light for this duty
Title: Re: S800 Support Thread
Post by: Davo on January 09, 2009, 04:06:47 PM
My apologies, I stand corrected!! :-\

In the Green pre thread, he says that a 30va will work for 8 channels, don't know where I got 15 from... 50 is probably
the better bet all around

Quote
Would this transformer work for power for 2 channels of green?

http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=122-605

Looks good to me. Will work for up to 8 channels.....

Peter

That's got me worried..... will 7VA be enough for a stereo unit... probably have to get some 10va traffos
Title: Re: S800 Support Thread
Post by: mitsos on January 10, 2009, 12:04:03 PM
Yeah, seemed a bit low... Still, I think the 7VA would be OK for this, but I'm not 100% sure.. It should do 2x 15V @ 230mA, right? Anyway, I hope someone chimes in to verify my "math" ... does this circuit only use 13-26mA per channel?
Title: Re: S800 Support Thread
Post by: Davo on January 11, 2009, 04:06:15 AM
Peter was kind enough to answer an email about this: ;D

"I estimate about 50mA per rail, about 2.4VA per board.
 
Once you have done it, with both channels powered & LEDs lit, check the voltage before the regulators & make sure it is at least 2V more than the regulated voltage."
Title: Re: S800 Support Thread
Post by: mitsos on January 11, 2009, 06:32:45 AM
That's awesome.. So a 10VA, 2x15V should be more than adequate. Even 7VA should be fine.
Title: Re: S800 Support Thread
Post by: solderspongebob on January 11, 2009, 07:08:04 AM
Hi all,

Does anyone know where I can find the PCB layout and schematic for this EQ project (if it was ever available - I would understand if it was not made common knowledge).

Thanks,

Paul
Title: Re: S800 Support Thread
Post by: Davo on January 11, 2009, 07:31:38 AM
Hi all,

Does anyone know where I can find the PCB layout and schematic for this EQ project (if it was ever available - I would understand if it was not made common knowledge).

Thanks,

Paul

Peter C has boards for these... his web page is:  http://1176neve.tripod.com/id15.html

That's awesome.. So a 10VA, 2x15V should be more than adequate. Even 7VA should be fine.

 ;D Yeah, quite happy bout that one... almost bit myself by savin a couple bucks
Title: Re: S800 Support Thread
Post by: stitch-o on January 11, 2009, 08:51:47 AM
RE:LED's

I want to use blue LED's in the channel indicator and a red one for power.
Because of the different forward voltage and mA will I need a resistor in seriers on the blue LED's?

The power LED will def need one (I calculated 500R) because it is sitting directly on the power rail.

am I correct in thinking this?



Thanks chaps!
Title: Re: S800 Support Thread
Post by: matta on January 11, 2009, 01:37:31 PM
No need to adjust the 1K5 resistor on the BYPASS LED's, sub RED for BLUE and you will be fine. You will need one on the POWER LED, I'd also up it a bit, maybe closer to 1K, can't do you any harm.

Cheers

Matt
Title: Re: S800 Support Thread
Post by: stitch-o on January 11, 2009, 07:43:30 PM
No need to adjust the 1K5 resistor on the BYPASS LED's, sub RED for BLUE and you will be fine. You will need one on the POWER LED, I'd also up it a bit, maybe closer to 1K, can't do you any harm.

Cheers

Matt

I had a debate earlier about hanging a 115v lamp off the mains instead of an LED.
I am considering this as I like the idea of a bigger on lamp.

What voltage LED's are you using for the channels?

Cheers and I apologize in advance
Title: Re: S800 Support Thread
Post by: Dr nEon on January 21, 2009, 05:30:13 AM

Hey Stitch-o!

I'm also interested to know how to implement a "power on" indicator LED in the S800 .

 I'm using one of peter's green psu's with the LM317 etc.. this psu doesn't include led indicator , but I'm wondering if one can be added , maybe by putting one before the input of the +ve reg , to ground via a resistor.  I don't know if this would upset the  LM317 tho..?

maybe someone knows a good place on the s800 pcb where a power led could be connected..

cheers

nEon.

Title: Re: S800 Support Thread
Post by: mrphotodude on January 21, 2009, 05:40:24 AM
i just used a lighted switch...
easy enough. i dont know if there is room for one in the produced cases for the project though...i ghetto fashioned my own case.
i ended up taking the lighted switch out though...just didn't feel the need to use it, if i generally leave the in/out switches in...i get a led on.
i imagine anywhere after the regulators that wouldn't choke up alot of power would be okay- but dont quote me on that  :-X
Title: Re: S800 Support Thread
Post by: stitch-o on January 21, 2009, 07:37:50 AM
i just used a lighted switch...

those are cool.

I went with a 5/8" white 120V lamp from mouser.
I hate drilling such a nice faceplate, but so far (I'm waiting on a few more PS caps and a 1/32" drill
to open up some too-small through holes) it looks very pilot-light-y.

Slap this sucker in series with the toroidial and the power switch and good to go.
Title: Re: S800 Support Thread
Post by: mrphotodude on January 21, 2009, 07:42:39 AM
i had finally got mine in the rack over the weekend....
i had to make a faceplate a few times...i put my boards in normal, not upside down and i had kinda copied the prefab cases sold and realized....everything is backwards! Luckily i can make faceplates at work out of aluminum so it set me back a 5 minute drive and about half an hour of prep and output.
I did a few tweaks on mine...will post what i did and some pics soon. Still want to try out something with it. But overall...it sounds really "tight".
Title: Re: S800 Support Thread
Post by: Dr nEon on January 21, 2009, 07:43:38 AM
Yeah , I dont want to use a lighted switch.. neon's are especially a bad idea in audio , anyway.

I fab my own cases so I can easily accommodate one , but simple though it may be , I still have never been able to figure out if it is ok to just hang an led off the positive (or neg) rail to ground via the right resistance .

What influence could it have on the stability of the supply?  I imagined it would be better to power the indicator from BEFORE the reg ??

Some of the psu circuits around here ,i.e.  green psu , and calrec minipsu , dont make provision for an led. I'm wondering if that's just to keep things simple , or if there's a reason not to add one...

cheers

nEon.
Title: Re: S800 Support Thread
Post by: matta on January 21, 2009, 08:00:13 AM
Yeah , I dont want to use a lighted switch.. neon's are especially a bad idea in audio , anyway.

I fab my own cases so I can easily accommodate one , but simple though it may be , I still have never been able to figure out if it is ok to just hang an led off the positive (or neg) rail to ground via the right resistance .

What influence could it have on the stability of the supply?  I imagined it would be better to power the indicator from BEFORE the reg ??

Some of the psu circuits around here ,i.e.  green psu , and calrec minipsu , dont make provision for an led. I'm wondering if that's just to keep things simple , or if there's a reason not to add one...

cheers

nEon.


I just took it from the regulated + rail, got an over sized power trafo and some BIG filter caps, should not have any problems there...

Cheers

Matt
Title: Re: S800 Support Thread
Post by: Dr nEon on January 21, 2009, 08:57:27 AM
Hey Matta thanks for jumping in..

Quote
and some BIG filter caps

In the green psu , do you think i'd need to go any bigger than the four 1000u/35v' s ?

Also , did you take your led from the +ve rail where it enters the S800 board , or right after the reg , on the psu board,before the second caps?

cheers

nEon
Title: Re: S800 Support Thread
Post by: Davo on January 21, 2009, 09:19:13 AM
The 1000uf/35v's will do you just fine.... I've got a led hanging off the + rail of the psu after the reg.... no problemo.  Just pop a 1k to the + of the led, and connect the - to ground and your good... as long as you're tranny's got enough juice, you should be fine (10va or thereabouts.... tried a 7va, and it didn't work too well)

dave
Title: Re: S800 Support Thread
Post by: matta on January 21, 2009, 09:47:32 AM
Hey Matta thanks for jumping in..

Quote
and some BIG filter caps

In the green psu , do you think i'd need to go any bigger than the four 1000u/35v' s ?

Also , did you take your led from the +ve rail where it enters the S800 board , or right after the reg , on the psu board,before the second caps?

cheers

nEon

After the regs, before it entered the S800, follow Davo's instructions RE the resistor and you will be good. I have a 15VA trano for my 2 channels, more than enough juice and 1000uF is AMPLE.

Cheers

Matt

Title: Re: S800 Support Thread
Post by: Dr nEon on January 21, 2009, 10:57:51 AM

 Davo, Matta...
 
 Many many thanks, guys ...my tx is 18VA so no worries!

 cheers

 nEon.
Title: Re: S800 Support Thread
Post by: stitch-o on January 21, 2009, 12:05:32 PM
Yeah , I dont want to use a lighted switch.. neon's are especially a bad idea in audio , anyway.
 

how bad might I ask?
Title: Re: S800 Support Thread
Post by: Dr nEon on January 21, 2009, 03:04:49 PM

 stitch-o , check the comments from prr and owel , near the bottom of this thread:

http://www.groupdiy.com/index.php?topic=2260.0 (http://www.groupdiy.com/index.php?topic=2260.0)

There are schools of thought that suggest rfi and induced ripple are nasty side effects of neon .

That said , I would still like to know myself , just how big a deal this is ,in the case of those little SCI neon switches..

cheers

nEon


Title: Re: S800 Support Thread
Post by: stitch-o on January 21, 2009, 03:33:54 PM

 stitch-o , check the comments from prr and owel , near the bottom of this thread:

http://www.groupdiy.com/index.php?topic=2260.0 (http://www.groupdiy.com/index.php?topic=2260.0)

There are schools of thought that suggest rfi and induced ripple are nasty side effects of neon .

That said , I would still like to know myself , just how big a deal this is ,in the case of those little SCI neon switches..

cheers

nEon





That is a very good read.
It sounds like tho if you wire in parallel series with the switch and keep far from chassis/ground AND the gear is not an amplifier circuit, a small neon should not cause problems.

I will wire mine and report back.

thanks and cheers!
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 21, 2009, 07:25:49 PM
Hey guys,

I too am using the PSU that came with the boards, the green pre PSU.  Why am I seeing these massive honkin' heat sinks?  What are they attached too, and do they really need to be that big?

Thanks,
Sig
Title: Re: S800 Support Thread
Post by: substitute on January 21, 2009, 08:26:36 PM
Quote
i had to make a faceplate a few times...i put my boards in normal, not upside down and i had kinda copied the prefab cases sold and realized....everything is backwards! Luckily i can make faceplates at work out of aluminum so it set me

I missed the boat on puruscha's cases so I need to drill my own.  Do you have a layout, or any advice?

Title: Re: S800 Support Thread
Post by: matta on January 22, 2009, 01:29:19 AM
Quote
i had to make a faceplate a few times...i put my boards in normal, not upside down and i had kinda copied the prefab cases sold and realized....everything is backwards! Luckily i can make faceplates at work out of aluminum so it set me

I missed the boat on puruscha's cases so I need to drill my own.  Do you have a layout, or any advice?


Purusha has a bunch of the 2 channel racks in stock... not sure if that is what you were looking for?

Matt
Title: Re: S800 Support Thread
Post by: substitute on January 22, 2009, 08:32:11 AM
Thanks, stitch-o mentioned that as well.  Now I'm not sure whether I want to stick with the cases I've already got or go with the prefabs. 
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 22, 2009, 10:23:06 AM
Got 2 channels done yesterday with the 8 channel case - VERY slow going, but I'm being pretty meticulous with the wiring, which there is a lot of, and heat shrinking all the wires.  I've been temporarily powering with a JLM for testing purposes, as I'm awaiting parts for the PeterC PSU, but again, I'm seeing these large heat sinks on the regulators in pics.  Are these necessary?  Do they get that hot?  The JLM seems to do just fine the way it is.

Thanks,
Sig
Title: Re: S800 Support Thread
Post by: Brolik on January 22, 2009, 11:33:23 AM
the large heatsinks are on Peter's suggestion


Brolik

I did an 8 chan Green  with a single PSU & I used a lump of aluminium about 50 x 25 x 5mm & it got HOT! Worked fine for a good few months but I then mounted the regs on the chassis for longevity's sake.

Bear in mind that the current draw for the S800 should be less per channel than the Green

Peter
Title: Re: S800 Support Thread
Post by: matta on January 22, 2009, 12:17:59 PM
Got 2 channels done yesterday with the 8 channel case - VERY slow going, but I'm being pretty meticulous with the wiring, which there is a lot of, and heat shrinking all the wires.  I've been temporarily powering with a JLM for testing purposes, as I'm awaiting parts for the PeterC PSU, but again, I'm seeing these large heat sinks on the regulators in pics.  Are these necessary?  Do they get that hot?  The JLM seems to do just fine the way it is.

Thanks,
Sig

Good luck with the 8 channel! I am almost done with the wiring for my first 8 (have to do a 2nd rack of 8... going to be putting it off for a while!). If you plan on using only ONE psu for 8 channels, then yes, BIG heatsinks will be needed. On a pair racked up in the 1U cases, with all the LEDS and opamps drawing current they were warm to touch, so I put on some small TO-220 sinks for longevity... for my 8 channels I'll be using @ supplies, one for 4 channels, the other for the other 4, and heatsinks on both... less heat build up, regs take less strain and if a PSU ever fails you are only down 4 channels... something t think about.

Cheers

Matt
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 22, 2009, 12:51:49 PM
Ya, well I certainly would've used four 1U 2 channel ones if I had known how annoying this case would be.  But, alas.  Does anyone have a part number for an adequate large heat sink that will work with the PSU?

Thanks,
Sig
Title: Re: S800 Support Thread
Post by: mrphotodude on January 23, 2009, 02:08:48 AM
Quote
I missed the boat on puruscha's cases so I need to drill my own.  Do you have a layout, or any advice?

i actually just cut the aluminum face on a table saw with a metal blade and then just measured the center of my pots across.
basically...just grab a caliper a ruler and a pencil and you will figure it out.
Even after drilling holes, some of it had to be nibbled and enlarged to fit things right. The actually printed plate i put on top of the backing plate hid the problems nicely though.
Its still a touch of ghetto though, i dont think i could get any of my projects to look as nice as some of the prefab stuff offered on the black market.
I still have to take pics of mine...i dont have internet access at home and i only work a few days a week and i am busy with other stuff...so it is a pain sometimes to get to the web.
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 23, 2009, 08:07:05 AM
Neon

2 x 47k's in parallel will be fine.

Brolik

I did an 8 chan Green  with a single PSU & I used a lump of aluminium about 50 x 25 x 5mm & it got HOT! Worked fine for a good few months but I then mounted the regs on the chassis for longevity's sake.

Peter

I'm trying my best to picture what mounting the regulators to the chassis looks like, and how it would be achieved...what has everyone else been doing in their 8 chn units? 

Thanks,
Sig
Title: Re: S800 Support Thread
Post by: peterc on January 23, 2009, 08:16:19 AM
When mounting the regs on the chassis, I meant onto the case. So it meant screwing the regs to the side of the box (with heatsink compound & insulating washers) after sanding the paint off beneath the regs. Then using flying leads to connect the legs of the reg to the PCB.

Peter
Title: Re: S800 Support Thread
Post by: mrphotodude on January 23, 2009, 08:32:01 AM
well, i have never had to mount the regs on any of my projects, but i would assume you could just drill a hole in the chassis, and mount the regulator itself right to the chassis(provided it is aluminum) and use a thermal pad or bit of paste...
then use some good thick wire soldered to the legs of the reg going into the board...a bit of heatshrink and i would think that would be fine.
Or go to a recycle center and see if you can find an old computer power supply and rip the big aluminum heatsink out of that cut those and use them as need be.
They are usually a few inches long and tall. Could probally get two regs right on the  board attached to one heatsink after you trimmed it to fit in a 1U.
If you are using the v6 green psu and have omitted the phantom power circuit, the regs should be in a position to allow the sharing of one large heatsink.
I dont know if you need a bigger heatsink than that...depends on the heat you are gettign and current you are pulling.

Here is an idea of the size of the heatsinks you can get out of a computer psu:
http://img192.imageshack.us/img192/8704/img09662at.jpg
sometimes you get smaller ones like this:
http://www.techwarelabs.com/guides/misc_mod/psu_mod/HeatsinkClearance.JPG
but i think they should be pretty decent. you could probally trim a bit one around the ps board if you have room..
like this:
(http://img299.imageshack.us/img299/2460/heatsinkck7.jpg)

might work, may not...like i said, depends on the heat you are really getting.

Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 23, 2009, 06:00:58 PM
When mounting the regs on the chassis, I meant onto the case. So it meant screwing the regs to the side of the box (with heatsink compound & insulating washers) after sanding the paint off beneath the regs. Then using flying leads to connect the legs of the reg to the PCB.

Peter

Cool, ok I think I'll try this, as weird as it's going to "feel" doing it...wish these 8 chn cases weren't SOOOO damn tight.

How are you guys mounting those LED's to the front panel?  A dab of silicone?  Mine don't fit super snug, and I'm afraid some dumb sh*t is going to poke one of them in, and I'll have to take the whole damn thing apart to fit it in again.

Thanks,
Sig
Title: Re: S800 Support Thread
Post by: geoff004 on January 23, 2009, 06:15:54 PM
How are you guys mounting those LED's to the front panel?  A dab of silicone?  Mine don't fit super snug, and I'm afraid some dumb sh*t is going to poke one of them in, and I'll have to take the whole damn thing apart to fit it in again.

I took some sheathing from the leads of my power transformer to insulate the leads on the LEDs (before soldering anything to the LEDs).  When the LED is pushed through the hole behind the front plate there is enough friction to keep it from going anywhere.  Finally when my front plate was in place I pushed the LEDs in to the holes where I wanted them, put a small flat head screw driver between the leads to the LEDs and gave a gentle twist to expand the leads(between the front and backing plate).  This pretty much locked them in to place (thus far).

Maybe then add a dab of hot glue from behind?  I didn't, but mine seem solid.
Title: Re: S800 Support Thread
Post by: RedNoise on January 24, 2009, 04:37:35 AM
Hi Geoff004 ,
A cool pic wd be usefull for bad english ...(Like I !)
Could you , please??
Thx!
Edit : I meant people who do not understand english very well...
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 24, 2009, 09:47:31 AM
Ya, I don't really understand what you mean.  My LED's extend out a few inches and are shrinkwrapped, but they don't sit tight in the front panel holes, so they slip out.  I tried hot glue, but by the time the front panel was nearly on, a few had broken loose.  Man, is this case a *****.  Everything is so tight and bulging and squished, it's so difficult to get anything to work.  The PSU should definitely NOT have been inside this unit, and I wish I had thought of this before.

Gonna keep trying some things.  On a good note, all 8 of my channels are wired, tested and calibrated, and sound fantastic!

Thanks,
Sig

EDIT - it appears there are certain LED's that fit very tight and snug, and some that don't, even though they're all 3mm.  I happened to pull one out of the drawer for the power, and it fit perfect.  So, I guess I have to cut all these off and try to find some replacements that fit better.   :'(
Title: Re: S800 Support Thread
Post by: RedNoise on January 24, 2009, 10:04:49 AM
Have you tried paste "nor spike/nail nor screw" ??? :P (sorry it's a translation of what we got here for paste type)

EDIT : http://www.toutcoller.com/pub/produit/produit-ni-clou-ni-vis,id-170.html
Title: Re: S800 Support Thread
Post by: matta on January 24, 2009, 03:20:13 PM
Ya, I don't really understand what you mean.  My LED's extend out a few inches and are shrinkwrapped, but they don't sit tight in the front panel holes, so they slip out.  I tried hot glue, but by the time the front panel was nearly on, a few had broken loose.  Man, is this case a *****.  Everything is so tight and bulging and squished, it's so difficult to get anything to work.  The PSU should definitely NOT have been inside this unit, and I wish I had thought of this before.

Gonna keep trying some things.  On a good note, all 8 of my channels are wired, tested and calibrated, and sound fantastic!

Thanks,
Sig

EDIT - it appears there are certain LED's that fit very tight and snug, and some that don't, even though they're all 3mm.  I happened to pull one out of the drawer for the power, and it fit perfect.  So, I guess I have to cut all these off and try to find some replacements that fit better.   :'(

I have some few tips and suggestions for making better use of the space in the rack to comfortably fit in the PSU's, but agreed, the case could have been deeper, those wires are REALLY squished in there. I will post some pics on Monday/Tuesday... the key is NOT use the suppled brackets....

RE the LED, I've been using super/crazy glue, just make sure that the LED's fir the rack, add a dab of super glue and it will hold VERY fast... no problems doing this on the 4 1U units I built, same plan for the 4U.

Cheers

Matt



Title: Re: S800 Support Thread
Post by: geoff004 on January 24, 2009, 04:13:29 PM
A cool pic wd be usefull for bad english ...(Like I !)

Hopefully my pictures will help better explain.
This is what I did and I'm content to live with it.
Here's what the LED looks like before installation.  Just strip and cut sheath to length and push it on to the LED leads.  Try to use thicker sheathing (like from extra wire from a power transformer).  Then solder wires to the LED.  I end with a little electrical tape or heat shrink on the solder joints.  Don't forget that the LEDs need to be wired properly to work - they have + and - ends (speaking from experience, it's a pain if not done correctly the first time).
(http://www.hazelriggbrothers.com/rotary/s8001.JPG)

Once the LED is pushed in to place I gently open up the leads with a screw driver.  My LEDs haven't moved in a couple of weeks of use.
(http://www.hazelriggbrothers.com/rotary/s8002.JPG)

I'll be curious to see how you worked your rack matta.  I used only the rear brackets.  I also drilled out the hole on the boards so that the PCB would sit flat to the bottom of the case.  The first 4 boards sit fairly perpendicular to the front panel. The last 4 are at a decent angle.  But I managed to fit everything with XLRs and DB25 connectors, and the entire PSU.  AC noise is only visible (I honestly haven't listened for it, but it came in at about -75 db on the waves analyzer) on channel 8 when I boost low frequencies - not the bottom pot (60/120 boost) but the one above it with the sweep-able freq.  I think it's because the pot is about 1 cm. from the transformer.  Everything else is totally quiet.
Title: Re: S800 Support Thread
Post by: RedNoise on January 24, 2009, 09:12:54 PM
thx guyzzz!
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 24, 2009, 10:10:02 PM
Ya, I don't really understand what you mean.  My LED's extend out a few inches and are shrinkwrapped, but they don't sit tight in the front panel holes, so they slip out.  I tried hot glue, but by the time the front panel was nearly on, a few had broken loose.  Man, is this case a *****.  Everything is so tight and bulging and squished, it's so difficult to get anything to work.  The PSU should definitely NOT have been inside this unit, and I wish I had thought of this before.

Gonna keep trying some things.  On a good note, all 8 of my channels are wired, tested and calibrated, and sound fantastic!

Thanks,
Sig

EDIT - it appears there are certain LED's that fit very tight and snug, and some that don't, even though they're all 3mm.  I happened to pull one out of the drawer for the power, and it fit perfect.  So, I guess I have to cut all these off and try to find some replacements that fit better.   :'(

I have some few tips and suggestions for making better use of the space in the rack to comfortably fit in the PSU's, but agreed, the case could have been deeper, those wires are REALLY squished in there. I will post some pics on Monday/Tuesday... the key is NOT use the suppled brackets....

RE the LED, I've been using super/crazy glue, just make sure that the LED's fir the rack, add a dab of super glue and it will hold VERY fast... no problems doing this on the 4 1U units I built, same plan for the 4U.

Cheers

Matt

Thanks for the tips.  Are you referring to the brackets that hold the modules in, or the brackets on the front panel that holds the space?  Because I'm not even sure how I'm going to get the front panel on and have everything line up.  It's very difficult to make all the pots come through the holes, very tight.

Thanks,
Sig




Title: Re: S800 Support Thread
Post by: matta on January 25, 2009, 02:27:09 AM
Ok,

This may help. What I did was get 30mm standoff and join the boards together, I then added some 3mm weather stripping on the top and bottom of the case, when you screw it together it clamps down on the PCB's, holding them all in place.

(http://www.matt-allison.com/diy/S800/8_channel_PCB_wired.jpg)

Cheers

Matt
Title: Re: S800 Support Thread
Post by: radiance on January 25, 2009, 06:27:48 AM
Way to go Matt! Looks very pro.,...
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 25, 2009, 07:02:08 PM
Great idea Matt.  This also opens up more space on the right side for the PSU.

What about those brackets for the front panel?  I still can't seem to fit them right without it slipping out.  Anyone else have issues getting  their front panel on nicely?

Thanks,
Sig
Title: Re: S800 Support Thread
Post by: sintech on January 25, 2009, 08:26:50 PM
Great idea Matt.  This also opens up more space on the right side for the PSU.

What about those brackets for the front panel?  I still can't seem to fit them right without it slipping out.  Anyone else have issues getting  their front panel on nicely?

Thanks,
Sig

Hey Sig, my panel was fitting really tricky and tight, so I opened up the pot holes with a drill (just taking the paint off), everything sat much better after this. I ended up gluing the front panel brackets in place.. cause they always slipped out!
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 25, 2009, 08:33:33 PM
I thought about doing exactly the same things.  Thanks for the tips!

Sig
Title: Re: S800 Support Thread
Post by: inputoutput on January 26, 2009, 10:49:47 AM
Tested some different chips the other day. Some OPA604s and a set of OPA134. the 134´s won. OPA134s are quite expensive, but if you don´t like hiss, then I would recommend them over the TL071s.   Some might argue that I have lost some of the trident sound... but I don´t know. To my spectrum-analyzer, things looks almost the same when I compare them visually.  But the noisefloor dropped down from -94 to -105 !!   Now I can use this EQ on the master too! yeeeee!

PS ; you must be careful turning any of the boostknobs to over +10 (or something like that). If you look at a spectrum-analyser, and turn the high-band-boost all the way up, f**kt up things happen all over, including an ugly bassboost. (happened with all the chips I tested)











Title: Re: S800 Support Thread
Post by: stitch-o on January 26, 2009, 01:06:34 PM
Tested some different chips the other day. Some OPA604s and a set of OPA134. the 134´s won. OPA134s are quite expensive, but if you don´t like hiss, then I would recommend them over the TL071s.

Would a chip like the OPA134PA be a drop in replacement for the TL071 in the S800 or is there some calculations to do? (I can't seem to find my TL071 datasheet offhand...)
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 26, 2009, 09:45:14 PM
Ok, a couple of tips for you 8 chn chassis builders, and some PSU questions.

1. Drill out the chassis threads, that way the screw that holds the panel on won't bottom out before you tighten it up.  This frustrated me so much. 

2. Also, use a 5/16th drill bit to drill out all the pot holes on the front panel.  Why they weren't made larger than the pots is beyond me, but I almost lost my mind after putting the entire thing together 3 times and finding out that half the pots didn't turn because of the friction.  Do yourself a favour, and drill once, and once only.

3. Stick the LED's in last, and take off the bottom cover and feed them in.  I tried doing it while doing the rest of the front panel and it drove me nuts, and I broke off several LED's when I pulled the panel off again and again.  Do it last, and you'll have a much easier time.

Now, here's my question.  I've built up the PSU with flying leads on molex connectors for the regulators, which are destined to be attached to the chassis.  I'm getting +-22.54 with the PSU unloaded.  I believe the S800 modules want to see +-18v (yes, no?), so am I correct in assuming that when al 8 channels are connected, this will drop down?  Or should I be changing a resistor now to drop it?

Thanks!
Sig

Title: Re: S800 Support Thread
Post by: 3nity on January 26, 2009, 10:02:08 PM
TL071 can hadle the +/- 18 but to be on the longevity side use +/- 15.

If you setled the psu to sit at +/- 18 you should read +/- 18!!

Seems like those cases are just a pain in the back.

BTW: those EQ's are just awesome eq's.  8)
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 26, 2009, 10:11:25 PM
Ok, so then my PSU voltage is too high.  What resistor do I swap out to bring it down to +-15v, and what value should I be using?

The EQ's do sound fantastic though, and it's funny because they were so easy to build, but racking them into this case with all the wiring is the biggest pain.

Thanks,
Sig
Title: Re: S800 Support Thread
Post by: 3nity on January 26, 2009, 10:19:37 PM
you using the Peter C psu?
http://www.twin-x.com/groupdiy/albums/userpics/Green_PSU_V6_Overlay_%2B_trax.pdf (http://www.twin-x.com/groupdiy/albums/userpics/Green_PSU_V6_Overlay_%2B_trax.pdf)

You should use 2K2 to get +/- 15V.
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 27, 2009, 12:19:44 AM
Hmmmm I stuffed the board with the values that were listed on the silkscreen, so it appears I did use 2k2, no?  Why am I getting 24v?
Title: Re: S800 Support Thread
Post by: Davo on January 27, 2009, 01:16:44 AM
Are you getting 24v on both + and - rails.... you could have a blown regulator in there somewhere... Peter indicated that you should be getting roughly 21.5v before the regs.... doesn't look like the voltage is dropping at all.  The Lm317 and 337 should bring the voltage to 15v with the 2k2 and 220r resistors.... when I want an adjustable voltage psu, I toss 500r trimpots on the 220r spots and tweak it to the voltage I need
Title: Re: S800 Support Thread
Post by: mrphotodude on January 27, 2009, 02:28:36 AM
Quote
Tested some different chips the other day. Some OPA604s and a set of OPA134. the 134´s won. OPA134s are quite expensive, but if you don´t like hiss, then I would recommend them over the TL071s.

I had put 2134's in U6 and thought it sounded better myself over a 2604(instead of the 5532).
When i turn up the high end all the way and max the eq out i could hear hiss and putting in a opa267 in U1 dropped that right out. Now it is silent and tight sounding. Tried some ada797,opa627, 5534 ect in the other positions but it didnt alter the sound much so i left U2-U5 tl071 and am very happy.
I thought about tweaking the HF caps and maybe putting in a larger log tapered pot. It gets noticeably bright at about 75% rotation then not much more.
will drop pic in tonight of the unit.
Title: Re: S800 Support Thread
Post by: peterc on January 27, 2009, 02:39:06 AM
Quote
Hmmmm I stuffed the board with the values that were listed on the silkscreen, so it appears I did use 2k2, no?  Why am I getting 24v?

Check the voltage before the regs & after the regs. If it is the same you've got either blown regs or the protection diodes are the wrong way round.
Title: Re: S800 Support Thread
Post by: mrphotodude on January 27, 2009, 03:08:52 AM
here is my unit..
(http://img142.imageshack.us/img142/1489/16068657uf5.jpg)
I had to take an old chassis and cut and bend the back and rig it to make it work...but it is going into a rack, not a beauty contest.
I have a dual 115in/15vac out transformer..ended up changing the 2k2 to 2k6 i believe it was on the powersupply board to give me 18-0-18. Its ghetto compared to some of the projects i have seen here, but it sounds good and i am going to use the heck out of it 8)
I will have those cool little knobs on the black market shortly. They are all black, i roughed a few up and spray painted them white for the frequency selector.
Title: Re: S800 Support Thread
Post by: matta on January 27, 2009, 06:03:41 AM
here is my unit..
http://img142.imageshack.us/img142/1489/16068657uf5.jpg
I had to take an old chassis and cut and bend the back and rig it to make it work...but it is going into a rack, not a beauty contest.
I have a dual 115in/15vac out transformer..ended up changing the 2k2 to 2k6 i believe it was on the powersupply board to give me 18-0-18. Its ghetto compared to some of the projects i have seen here, but it sounds good and i am going to use the heck out of it 8)
I will have those cool little knobs on the black market shortly. They are all black, i roughed a few up and spray painted them white for the frequency selector.

Looks great, the S800 'Blue Stripe' Edition :-)

Matt
Title: Re: S800 Support Thread
Post by: mrphotodude on January 27, 2009, 06:31:10 AM
yeah, its a webpress plate i made at work. Its more of a green.
http://www.houstonfreeways.com/images/printing/krehbiel_mitsubishi_plate_in_machine_B_2003-08-21_700.jpg
they wrap around a cylinder and attract ink which images on a rubber roller and then presses on the paper.
Now we have a new machine with baby blue plates.
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 27, 2009, 01:24:49 PM
Quote
Hmmmm I stuffed the board with the values that were listed on the silkscreen, so it appears I did use 2k2, no?  Why am I getting 24v?

Check the voltage before the regs & after the regs. If it is the same you've got either blown regs or the protection diodes are the wrong way round.

Can someone send me a large close up pic of their PSU so I can see if the orientation of everything is correct?  I'm positive I'm right and I've followed the silkscreen.  I checked the voltage before and after, and I believe it's the same, +-23v, but how did I blow both regulators??

Thanks,
Sig
Title: Re: S800 Support Thread
Post by: Davo on January 27, 2009, 02:34:35 PM
Here's everything that's got an orientation  (this is for V4 PSU)
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 27, 2009, 02:45:47 PM
Here's everything that's got an orientation

For real??  Then that top Diode is incorrect on the silkscreen, because it shows the white band should be on the left hand side for both diodes.  This seems like my problem then, I'll correct it and see.

Thanks!
Sig
Title: Re: S800 Support Thread
Post by: matta on January 27, 2009, 03:18:24 PM
There have been multiple versions of Peter's PSU, some had Diode facing the other way from others... make sure the overlay you have follows the schematics... it is pretty simple to trace out as well.

Cheers

Matt
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 27, 2009, 03:23:17 PM
I have Green PSU V6a 1-3-7, and I just assumed following the silk screen would be correct...
Title: Re: S800 Support Thread
Post by: Davo on January 27, 2009, 03:43:49 PM
Yeah, ignore my post.... 6a 1-3-7 has got em just like the silkscreen, hmmm... sorry for the stupid question, but did you hook up your ground?
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 27, 2009, 03:44:09 PM
Ok, well I swapped the diode and I'm still getting the same voltage.  Could the problem be my bridge rectifier?  They didn't have a 1A so the guys gave me a 10A.  That doesn't seem like it would cause an issue though.

However, in testing, my - rail touched the leg of a cap and the 337 exploded in a flash of blinding light.  Need to go and order a new one now F*^k.

If this thing frustrates me any further, I'll just use the JLM supply.  Those things are always solid and work great, and it's already built up.

Thanks,
Sig
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 27, 2009, 03:45:44 PM
Yeah, ignore my post.... 6a 1-3-7 has got em just like the silkscreen, hmmm... sorry for the stupid question, but did you hook up your ground?

Hook up my ground...?  To where?

That leads me to the question of why that extra screw is in the 8 chn chassis...is this something to do with the ground you speak of?

My apologies, first time building up these Green PSU's.

Thanks,
Sig
Title: Re: S800 Support Thread
Post by: Davo on January 27, 2009, 03:53:31 PM
I'm not sure about the extra screw, but it may be a place for you to star ground everything...... you can hook it up to either of the yellow arrows..... I usually run my tranny's centertap to the one on the right and just run the one of the left to the chassis star ground
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 27, 2009, 03:57:36 PM
Well, I was in the test phases, but you really think that not grounding it would give the incorrect voltages??  The JLM supply needs to be grounded as well, but it still shows the correct voltage even without grounding.

I'll try it, but I don't know...

Thanks,
Sig
Title: Re: S800 Support Thread
Post by: Davo on January 27, 2009, 04:10:05 PM
I'm not sure, haven't tried it ungrounded, and haven't had problems with these PSU's.... I've got 5 of em in various applications, and they've been great!  probably don't need to run it to your chassis right now, but I'd make sure it's grounded somewhere.
Title: Re: S800 Support Thread
Post by: matta on January 27, 2009, 04:20:20 PM
Sig,

There is an old adage that says "A picture says more than a thousand words"... SHOW us your PSU, maybe we can spot something that might be a miss.

Also, no the ground wouldn't make a difference, as long as you measure from the transformer CT to your reference point it should be fine.

Cheers

Matt
Title: Re: S800 Support Thread
Post by: peterc on January 27, 2009, 04:30:13 PM
Sig

What voltages do you get at the DC legs of the Bridge?
Title: Re: S800 Support Thread
Post by: stitch-o on January 27, 2009, 07:12:08 PM
I have Green PSU V6a 1-3-7, and I just assumed following the silk screen would be correct...

I have one of these as well...
Did you trace the lines to determine the various 100nf's polarity?

Cheers!
Title: Re: S800 Support Thread
Post by: Davo on January 27, 2009, 09:19:12 PM
Stitch, the silkscreen is perfect... I'd use ceramics or poly's on the 100nf's, so no need to worry bout polarity (if you've got lytics for that value, you'd better trace it :))

Sig, sorry bout the confusion with grounding.... Matt's right, I was thinking in terms of the centertap being connected (was thinking back to a time when I was getting weird voltages and realized I hadn't grounded it)
Title: Re: S800 Support Thread
Post by: stitch-o on January 28, 2009, 08:52:17 AM
Stitch, the silkscreen is perfect... I'd use ceramics or poly's on the 100nf's, so no need to worry bout polarity (if you've got lytics for that value, you'd better trace it :))

Interesting...So, a cap like this Vishay/Dale .01uf Poly (http://www.mouser.com/Search/ProductDetail.aspx?qs=sGAEpiMZZMvCt%252bwg%252braTut0%252b8N2Na0J5Q%252bSADQXOBKY%3d) should work fine, correct?

Cheers and thanks, Davo!


edit: Ooops, I guess I meant .1uf

Title: Re: S800 Support Thread
Post by: peterc on January 28, 2009, 09:42:59 AM
Davo

.01uF is only 10nF, 100nF is 0.1uF.

Couldnt find anything about lead spacing in the datasheet, look for something with 5mm between leads.

Peter
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 28, 2009, 05:01:30 PM
Couldn't get any voltages from your PSU Peter, so I gave up and trashed it and used a JLM - works perfectly, as always.

Ok, a word to the wise.  USE nylon screws and nuts if you're going to mount the regulators to the case.  I tried and tried, with the insulating washers and the little round nubbin thing but I kept shorting out and blowing fuses.  Think I've got it under control now - man, are those hard to find locally - NO ONE carries those things.  Best advice I could give, build yourself an external PSU and forget about putting it into the case.  It's far too annoying and messy.  Then hook it up with a 4 pin XLR like I did my Neves.

Sig
Title: Re: S800 Support Thread
Post by: 3nity on January 28, 2009, 05:04:38 PM
lol this is funny!!
i have build like 10 of Peter psu's and never got any problem!!!
Dont trash it!
 ;D
Title: Re: S800 Support Thread
Post by: radiance on January 28, 2009, 05:13:39 PM
lol this is funny!!
i have build like 10 of Peter psu's and never got any problem!!!
Dont trash it!
 ;D

Same here...multipple builds....on vero board ...no probs whatsoever....
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 28, 2009, 05:41:05 PM
I've got no time to be fu*king around with a power supply for endless hours.  If something else works, then get it done and move on.

Everything is done, tested, calibrated and sounding fantastic.  Just putting on the knobs now and I'll post some pics later.

Sig
Title: Re: S800 Support Thread
Post by: matta on January 29, 2009, 12:51:59 AM
Couldn't get any voltages from your PSU Peter, so I gave up and trashed it and used a JLM - works perfectly, as always.

Ok, a word to the wise.  USE nylon screws and nuts if you're going to mount the regulators to the case.  I tried and tried, with the insulating washers and the little round nubbin thing but I kept shorting out and blowing fuses.  Think I've got it under control now - man, are those hard to find locally - NO ONE carries those things.  Best advice I could give, build yourself an external PSU and forget about putting it into the case.  It's far too annoying and messy.  Then hook it up with a 4 pin XLR like I did my Neves.

Sig

Sig,

You did of course NOT forget to use a mica isolator ALONG with the insulating washer and screw right? And isolator kit comprises of 2 parts, a mica pad that goes between the reg and the case and then a washer that goes through the hole and is mounted with a screw.... if you didn't DO it, you may have is sitting ok NOW, but it WILL one day short... and at best take out a fuse... worse take out your EQ's...

If you use my mounting method for the PCB's there is ample room for the PSU's in the rack and even with the Torrid my 8 channel is DEAD and I mean DEAD quiet.

I hate to say this but I'm sure the problem doesn't lie with Peter'c PCB as MANY of of us have built hundred of them combined with no problems. Glad you go the JLM to work... for now... just hoped you HAVE indeed mounted it correctly.

Cheers

Matt
Title: Re: S800 Support Thread
Post by: stitch-o on January 29, 2009, 12:01:43 PM
S800 is alive! (tho only the PS so far...)
But everything is there and almost wired.

If anyone is interested, here are some working pictures (close up of my solution to the on lamp):::

(http://img519.imageshack.us/img519/2767/dscf1403lp3.th.jpg) (http://img519.imageshack.us/my.php?image=dscf1403lp3.jpg)

(http://img516.imageshack.us/img516/7734/dscf1392lf6.th.jpg) (http://img516.imageshack.us/my.php?image=dscf1392lf6.jpg)
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 29, 2009, 12:16:32 PM
Couldn't get any voltages from your PSU Peter, so I gave up and trashed it and used a JLM - works perfectly, as always.

Ok, a word to the wise.  USE nylon screws and nuts if you're going to mount the regulators to the case.  I tried and tried, with the insulating washers and the little round nubbin thing but I kept shorting out and blowing fuses.  Think I've got it under control now - man, are those hard to find locally - NO ONE carries those things.  Best advice I could give, build yourself an external PSU and forget about putting it into the case.  It's far too annoying and messy.  Then hook it up with a 4 pin XLR like I did my Neves.

Sig

Sig,

You did of course NOT forget to use a mica isolator ALONG with the insulating washer and screw right? And isolator kit comprises of 2 parts, a mica pad that goes between the reg and the case and then a washer that goes through the hole and is mounted with a screw.... if you didn't DO it, you may have is sitting ok NOW, but it WILL one day short... and at best take out a fuse... worse take out your EQ's...

If you use my mounting method for the PCB's there is ample room for the PSU's in the rack and even with the Torrid my 8 channel is DEAD and I mean DEAD quiet.

I hate to say this but I'm sure the problem doesn't lie with Peter'c PCB as MANY of of us have built hundred of them combined with no problems. Glad you go the JLM to work... for now... just hoped you HAVE indeed mounted it correctly.

Cheers

Matt

A mica isolator is those little round nubbin things, or the flat insulating washer that spans the size of the regulator?  Either way, yes, I used those, along with the plastic screws.  I don't know why it kept shorting out on me.  Perhaps the regulator was touching through the back of the insulating washer.  I used all the parts that came with the JLM PSU.

And, as far as the Green PSU goes, I have no doubt that many of you have had great success with them.  If the problem doesn't lie with the bridge I used, then I don't know what.  I'm of the frame of mind that if something doesn't work, you find another solution and move on, come back to it later if need be.  The studio is really busy right now and I would likely have not gotten back to it for another 2 months if I played around trying to get that old PSU to work.  Now, I have an eq that works that I can use on the next several sessions.

Oh, and I didn't use your mounting technique because I did not have any standoffs that large sitting around, and it's STILL dead quiet on channel 8.  I may do that later on sometime, or not.  Who cares, it works, I don't give a sh*t what the inside looks like, and neither does anyone else.

Thanks,
Sig
Title: Re: S800 Support Thread
Post by: matta on January 29, 2009, 02:07:47 PM
Hey Sig,

I'm glad it works! I'm just worried as to why it kept shorting!

It may well have just been a prob with something in the PSU, it is solved great. I just hope it doesn't come back to bite you and trying to help you troubleshoot and figure out WHERE the problem lies, if it KEEPS shorting you got to ask WHY.

One thought that comes to mind is that you may have a metal 'rasp' where you drilled your chassis holes and when you tighten the screw is cause it to push the bur through the mica isolation (that is the strip that goes between the reg and the chassis)... I've seen this happen before.

An easy test would have been to try a regular heat sink that is NOT ground to the chassis/star ground and see if still shorts... if not, then the prob is the chassis... you won't damage the regs as both LM317/LM337 have a thermal shut down /protection in them.

You may have it working now, but if the reg slips or is overtightened, then it may well short again , doesn't mater WHAT PSU it is, JLM/PeterC/MNATS etc...

But hey, if you are happy then go for it! Problem solved  ;D

RE not caring what it looks like inside, well that is your approach, personally, I care... as do others.

Clean/Clear wiring can help you trace down problems that may/will occur in time... and 'guessing' which of the no less than 380+ off board wires in that unit is the problem is going to be a ***** if it looks like a dogs breakfast.

Yes it is frustrating and time consuming, but a stitch in time save nine as they say.

Matt
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 29, 2009, 02:17:45 PM
Oh, I didn't say that my wiring was messy, in fact it's impeccable, I used little pieces of heatshrink on every pair of cables to tie them together (not twisted like yours, can't seem to braid like you do - are you a hairdresser by day?) and on every pot/connection.  I'm simply referring to the fact that the 8 modules just sit there and aren't strapped together like yours, which I can easily do down the road.  Very easy to trace things down, and everything is properly colour coded so should anything go wrong, it will be very easy to figure out.

Your idea of a metal "rasp" from drilling could very well be what was making it short out.  I'll check into that.

Sig
Title: Re: S800 Support Thread
Post by: matta on January 29, 2009, 11:45:12 PM
Oh, I didn't say that my wiring was messy, in fact it's impeccable, I used little pieces of heatshrink on every pair of cables to tie them together (not twisted like yours, can't seem to braid like you do - are you a hairdresser by day?) and on every pot/connection.  I'm simply referring to the fact that the 8 modules just sit there and aren't strapped together like yours, which I can easily do down the road.  Very easy to trace things down, and everything is properly colour coded so should anything go wrong, it will be very easy to figure out.

Your idea of a metal "rasp" from drilling could very well be what was making it short out.  I'll check into that.

Sig


Hah Hah!!! Not a hairdresser, no... and that twisting takes a few seconds a foot!

I'll let you in on the trick! I use an electric drill!!!! Place the ends of the wires on one end into the drill chuck, then tighten. Use you other hand to hold the other end, then just start the drill, it twists the wires for you in no time as all.

All you need to do is make sure you slowly release the hand holding the wires as they will naturally want to twist back on themselves, let the kinks work out naturally and viola, instant twisted cables in seconds!

RE the bur, check it out and see, use a counter sink to clear away any burs and smooth the surface.

Matt
Title: Re: S800 Support Thread
Post by: peterc on January 30, 2009, 12:59:39 AM
Once you have mounted the regs on the case/heatsink, use a multimeter to check for continuity between the regs & case. Only way to make sure there are no shorts.

Peter
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 30, 2009, 01:24:24 AM
Nice trick Matt!

Yes, a multimeter is the only way.  I blew a couple of fuses before I got fed up and started checking continuity with a meter.

Thanks,
Sig
Title: Re: S800 Support Thread
Post by: matta on January 30, 2009, 08:37:40 AM

Hey Guys,

Here are some pics of the final 8 channel, in all its glory.

(http://www.matt-allison.com/diy/S800/Racked_Front.jpg)

(http://www.matt-allison.com/diy/S800/Racked_Insides2.jpg)

(http://www.matt-allison.com/diy/S800/Racked_Rear.jpg)

Almost 400 off board wires in that box!!!! Not a project I want to tackle again soon...

Matt
Title: Re: S800 Support Thread
Post by: 3nity on January 30, 2009, 09:09:57 AM
Isnt all tha wiring too near the AC??

That job looks very good!
Title: Re: S800 Support Thread
Post by: matta on January 30, 2009, 09:36:20 AM
Isnt all tha wiring too near the AC??

That job looks very good!

No DEAD quiet, and I mean DEAD! I was worried about putting the trafo in the box, but it is quiet.
I'm a stickler for noise as my many threads will show, and this has to be one of the quietest piece I have.

I find the opamps themselves are more likey to pick up noise/hum from stray EMF, hence me moving the PCB's them as far away as possible from the torrid.

Cheers

Matt
Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 30, 2009, 10:55:43 AM
These boards aren't very susceptible at all to noise.  My toroid is even closer than Matt's, and mine are dead quiet as well.

Nice work Matt.  I need to find some of those standoffs.  You got them locally, I presume.

I see you didn't use the Green PSU either.

Sig
Title: Re: S800 Support Thread
Post by: matta on January 30, 2009, 11:12:28 AM
These boards aren't very susceptible at all to noise.  My toroid is even closer than Matt's, and mine are dead quiet as well.

Nice work Matt.  I need to find some of those standoffs.  You got them locally, I presume.

I see you didn't use the Green PSU either.

Sig

Hey Sig,

I used a pair of MNATS's psu's that I had lying around. They too are stacked on each other, each PSU feeding 4 channels... that way if oen ever goes down Ill still ahve 4 units working  ;) I can't imaging having to fit 2 x PeterC PSU's in there, that space is cramped!!!

RE the standoff's yeah got them at my local electronics shop, 30mm high.

Matt

Title: Re: S800 Support Thread
Post by: Siegfried Meier on January 30, 2009, 11:14:33 AM
But, the Mnats PSU COULD handle 8 channels, no? 

And you didn't take your regulators off board - heat was good enough to not have to?
Title: Re: S800 Support Thread
Post by: matta on January 30, 2009, 11:19:12 AM
But, the Mnats PSU COULD handle 8 channels, no? 

And you didn't take your regulators off board - heat was good enough to not have to?

Yes, it COULD, but then I would have to take the regs off board. Now I just have standard To-220 heatsinks on the regs that are only powering 4 channels each (the other benifit of 2 PSU's... less current draw per PSU), therefore less heat build up. They are hot to the touch but seem to be handling things well and no need to take them off board.

Matt

Title: Re: S800 Support Thread
Post by: MikoKensington on January 30, 2009, 11:57:59 AM
Matt.  That build is most impressive.  You should build one for me, tonight.  You can do that, right? 
Title: Re: S800 Support Thread
Post by: 3nity on January 30, 2009, 12:10:30 PM
So theres not a problem powering 2 supplys from a single p.transformer?
Thanks.
Title: Re: S800 Support Thread
Post by: matta on January 30, 2009, 12:36:28 PM
So theres not a problem powering 2 supplys from a single p.transformer?
Thanks.

Not if it is big enough, mine is 50VA, more than enough for 8 channels.  The PSU is only going to draw the current it needs, so you just need to make sure that transformer can supply the juice. I saw it done in my old Valley People PR-10 10 rack the same way, 2 separate PSU's from a single trano, each suppling 5 modules with power.

Matt

Title: Re: S800 Support Thread
Post by: matta on January 30, 2009, 12:43:36 PM
Matt.  That build is most impressive.  You should build one for me, tonight.  You can do that, right? 

If you night has about 60 hours in it, maybe, LOL... prob one of the most time consuming jobs I've EVER done! Easy to do, just time consuming!

Matt
Title: Re: S800 Support Thread
Post by: dissonantstring on January 30, 2009, 12:45:08 PM
awesome job matt! (thumbs and beers)
i've only built the two channel which was a breeze, but eight channels look downright daunting.  how you got everything so tidy and pro looking is a testament of your DIY abilities.  i thought you were building this into somekind of sidecar or something. :o
regards,
grant
Title: Re: S800 Support Thread
Post by: matta on January 30, 2009, 02:25:42 PM
awesome job matt! (thumbs and beers)
i've only built the two channel which was a breeze, but eight channels look downright daunting.  how you got everything so tidy and pro looking is a testament of your DIY abilities.  i thought you were building this into somekind of sidecar or something. :o
regards,
grant

Well at this rate it could have been a console! I have built 4 x 2 channel units for friends and local studios, this 8 channel was for myself, financed from the 4 units... until another friend spotted it and claimed it!!!! Now I have to build another one for msyelf... which will bring the total of 24 channels of S800 Eq's!!!! Yikes!!!

I'm in NO RUSH to embark on this project in a hurry!!!

Matt
Title: Re: S800 Support Thread
Post by: Knarleybass on January 30, 2009, 08:13:14 PM

Hey Guys,

Here are some pics of the final 8 channel, in all its glory.

(http://www.matt-allison.com/diy/S800/Racked_Front.jpg)

(http://www.matt-allison.com/diy/S800/Racked_Insides2.jpg)

(http://www.matt-allison.com/diy/S800/Racked_Rear.jpg)

Almost 400 off board wires in that box!!!! Not a project I want to tackle again soon...

Matt

looks amazing, what did you use for a transformer and power supply?

To be honest I am a little intimidated by all the wiring... I may sell my case off
Title: Re: S800 Support Thread
Post by: matta on January 31, 2009, 12:51:05 AM
Power supplies are MNAT's, Torrid is a Nuvotem that I bought from RS,  2 x 0-18VAC, total 50VA rating. Re selling the case... might be an option if you are not up the the long haul... I've thought about doing so with my 2nd unit... it really ate up alot of time building this sucker offboard.

Matt
Title: Re: S800 Support Thread
Post by: stitch-o on February 03, 2009, 09:54:01 AM
Woohoo!!

Thanks a billion people...

(http://img111.imageshack.us/img111/4669/s800hz9.th.jpg) (http://img111.imageshack.us/my.php?image=s800hz9.jpg)
Title: Re: S800 Support Thread
Post by: Brolik on February 03, 2009, 01:06:37 PM
looks awesome with those black knobs, glad you didn't want the sifams  ;)

Where's the inside shots? I wanna see your pretty wiring.
Title: Re: S800 Support Thread
Post by: stitch-o on February 04, 2009, 09:03:53 AM
GUts:::
(http://img24.imageshack.us/img24/5913/s800liduz3.jpg)
(http://img24.imageshack.us/img24/6120/s800gutzhp1.jpg)

The only tip worth mentioning is the fact that, when using Purusha's case, the boards are
upside-down with all the contacts too close to the case top for my comfort.
I Masked the inside of the top panel with electrical tape to avoid any shorts.
Better safe than sorry...

Any comments or critiques are more than welcome...thanks again matey's!!
Title: Re: S800 Support Thread
Post by: stitch-o on February 11, 2009, 09:44:52 AM
I'm def gonna humble myself with this one:
So the build is finished (obviously) and I finally got around to fully testing the circuit and to my surprise,
the signal is freakin distorted. Both sides (but the right channel passes much more distorted signal than the left). All frontpanel functions seem to work as the heavily distorted mash is affected accordingly when engaging the pots and switches.
I measured at the point where power hits the channel PCB:
channel 1 vdc at the eq board: 15.07 / -15.14
channel 2 vdc at the eq board: 15.07 / -15.14
....so....
maybe a wrong value resistor somewhere? fried a cap or IC?

Before I go component by component to see where things aren't working right, does anyone have an idea of where I could look first?

Cheers as always!
Title: Re: S800 Support Thread
Post by: Siegfried Meier on February 11, 2009, 10:12:43 AM
Calibrate the EQ - I've noticed every trimpot comes standard turned up too high, so you need to perform this.  And read this entire thread, because we've already discussed this.

Sig
Title: Re: S800 Support Thread
Post by: stitch-o on February 11, 2009, 10:27:06 AM
its a good thing 'I apologize in advance'...
starting thread study now.



cheers and thanks!

:::in calibrating the eqs for unity gain, i have discovered the trimpots work but I am loosing a great deal of signal.
I've set the trim at the highest possible level before distortion but I'm loosing a huge amount of signal.
I'll start there but could it be possible that the pot pins are shorting on the metal mounting?
I had used electrical tape and flush cutters as per Matta's suggestion but maybe tape got rubbed away?
That will be a last resort check I guess...

thanks all...
Title: Re: S800 Support Thread
Post by: matta on February 11, 2009, 12:15:45 PM
Stitch, can you upload bigger pics of your wiring? I think you may have a loop which can cause all weird stuff, also can you confirm that you have the correct pins going from the Moulex to the XLRS? Also uplaod some pcis of the PCB's and I'll give them the once over.

This should be an easy fix and we will get through ti together  ;D

Cheers

Matt
Title: Re: S800 Support Thread
Post by: stitch-o on February 11, 2009, 12:48:39 PM
You kats are a prince... ;D
It very well (most probably) could be something quite obvious and stupid on my part.
I second opinion is always very valuable.

(http://img14.imageshack.us/img14/3095/dscf1415mr9.th.jpg)Stitch's S800 pic 1 (http://img14.imageshack.us/my.php?image=dscf1415mr9.jpg)
(http://img149.imageshack.us/img149/6133/dscf1416gt2.th.jpg)]Stitch's S800 pic 2 (http://img149.imageshack.us/my.php?image=dscf1416gt2.jpg)
(http://img149.imageshack.us/img149/2858/dscf1418eb0.th.jpg)Stitch's S800 pic 3 (http://img149.imageshack.us/my.php?image=dscf1418eb0.jpg)
(http://img90.imageshack.us/img90/8369/dscf1419fj9.th.jpg)Stitch's S800 pic 4 (http://img90.imageshack.us/my.php?image=dscf1419fj9.jpg)
(http://img14.imageshack.us/img14/8400/dscf1420gn2.th.jpg)Stitch's S800 pic 5 (http://img14.imageshack.us/my.php?image=dscf1420gn2.jpg)
(http://img90.imageshack.us/img90/5123/dscf1421yh9.th.jpg)Stitch's S800 pic 6 (http://img90.imageshack.us/my.php?image=dscf1421yh9.jpg)

Cheers!
Title: Re: S800 Support Thread
Post by: matta on February 11, 2009, 03:20:20 PM
Well fixing that ground loop would be the first place to start....

Right now you have a ground referenced in multiple places, follow a star ground scheme.

It seems like you have a quazi scheme already, but you need to LIFT the Grounds on your PCB XLR ins and outs. Right now you have a loop because the PSU ground is tied to the chassis and the PCB's AND your star ground.

I would also put from heatsinks on those regulators.

Also I need a BIGGER pics of the PCB to check for faults there.

I assume the distortion/loss of signal happens on BOTH channels?

Cheers

Matt









Title: Re: S800 Support Thread
Post by: stitch-o on February 11, 2009, 04:05:03 PM
oops. yes, you are correct about connecting the PCB shields.
Fixed that.

What sort of heatsinks would fit on that configuration?
and, yes, the LOW signal/distortion is on both channels.

I'll try and take some better pics in a bit.
+ I know what you are looking for on the PCB as far as shorts, I'm going over it again myself right now...
Could I have put a wrong value part in somewhere possibly?
Cheers and thanks Matt!
Title: Re: S800 Support Thread
Post by: matta on February 11, 2009, 04:36:39 PM
oops. yes, you are correct about connecting the PCB shields.
Fixed that.

What sort of heatsinks would fit on that configuration?
and, yes, the LOW signal/distortion is on both channels.

I'll try and take some better pics in a bit.
+ I know what you are looking for on the PCB as far as shorts, I'm going over it again myself right now...
Could I have put a wrong value part in somewhere possibly?
Cheers and thanks Matt!

Well short are a good place to start, I was thinking more about the wrong value/component, so need to see a BIGGER pic to make out the bands.

Cheers

Matt

Title: Re: S800 Support Thread
Post by: stitch-o on February 12, 2009, 02:32:44 PM
Is it normal to run across 'bad' resistors?
I powered down and disconnected my S800 and measured resistor values across both boards, here are the ones that stuck out at me:::
place   board value   channel 1   channel 2
r45   10k   6.92k   6.94k
r8   1.2k   1.163k   1.166k
r9   1.2k   1.163k   1.162k
r13   1.5k   1.437k   1.437k
r24   2.7k   2.28k   2.29k
r25   4.5k   3.47k   3.46k
r44   1.5k   1.371k   1.37k
r20   2.7k   2.29k   2.28k
r21   4.7k   3.47k   3.46k
r28   47k   10.2k   10.2k
r30   47k   15.5k   23.3k
r31   47k   15.5k   23.3k
r15   1.2k   1.154k   1.153k
r45   10k   6.94k   6.91k
r46   47k   10.5k   10.4k
r17   10k   6.92k   6.95k
r12   1.2k   1.152k   1.152k
r10   1.2k   1.153k   1.152k
r11   4.7k   4.06k   4.07k


anyone have any suggestions?

Cheers again!!
Title: Re: S800 Support Thread
Post by: matta on February 12, 2009, 03:52:24 PM
Is it normal to run across 'bad' resistors?
I powered down and disconnected my S800 and measured resistor values across both boards, here are the ones that stuck out at me:::
place   board value   channel 1   channel 2
r45   10k   6.92k   6.94k
r8   1.2k   1.163k   1.166k
r9   1.2k   1.163k   1.162k
r13   1.5k   1.437k   1.437k
r24   2.7k   2.28k   2.29k
r25   4.5k   3.47k   3.46k
r44   1.5k   1.371k   1.37k
r20   2.7k   2.29k   2.28k
r21   4.7k   3.47k   3.46k
r28   47k   10.2k   10.2k
r30   47k   15.5k   23.3k
r31   47k   15.5k   23.3k
r15   1.2k   1.154k   1.153k
r45   10k   6.94k   6.91k
r46   47k   10.5k   10.4k
r17   10k   6.92k   6.95k
r12   1.2k   1.152k   1.152k
r10   1.2k   1.153k   1.152k
r11   4.7k   4.06k   4.07k


anyone have any suggestions?

Cheers again!!

Stitch,

You CANNOT measure across a resistor in circuit, power or no power... in order to measure correctly you would need to lift the leg of one end of the resistor.

I highly doubt that the kits from Colin would differ, I have built over 16 channels with the parts form Colin and have not had  single issue.

I'm pretty sure that there is prob a placement issue we need to resolve, hence my suggestion for a BIG ASS pic of the board to look over for ya  ;D

Cheers

Matt



Title: Re: S800 Support Thread
Post by: stitch-o on February 12, 2009, 04:00:03 PM
Is it normal to run across 'bad' resistors?
I powered down and disconnected my S800 and measured resistor values across both boards, here are the ones that stuck out at me:::
place   board value   channel 1   channel 2
r45   10k   6.92k   6.94k
r8   1.2k   1.163k   1.166k
r9   1.2k   1.163k   1.162k
r13   1.5k   1.437k   1.437k
r24   2.7k   2.28k   2.29k
r25   4.5k   3.47k   3.46k
r44   1.5k   1.371k   1.37k
r20   2.7k   2.29k   2.28k
r21   4.7k   3.47k   3.46k
r28   47k   10.2k   10.2k
r30   47k   15.5k   23.3k
r31   47k   15.5k   23.3k
r15   1.2k   1.154k   1.153k
r45   10k   6.94k   6.91k
r46   47k   10.5k   10.4k
r17   10k   6.92k   6.95k
r12   1.2k   1.152k   1.152k
r10   1.2k   1.153k   1.152k
r11   4.7k   4.06k   4.07k


anyone have any suggestions?

Cheers again!!

Stitch,

You CANNOT measure across a resistor in circuit, power or no power... in order to measure correctly you would need to lift the leg of one end of the resistor.

I highly doubt that the kits from Colin would differ, I have built over 16 channels with the parts form Colin and have not had  single issue.

I'm pretty sure that there is prob a placement issue we need to resolve, hence my suggestion for a BIG ASS pic of the board to look over for ya  ;D

Cheers

Matt





ahhh and now I know and also show my inexperience...
check your PMs and cheers!
Title: Re: S800 Support Thread
Post by: 3nity on February 12, 2009, 04:05:11 PM
do both channels act the same?
Try measuring voltages at critical points from board to board...

Jorge Aristondo.
Title: Re: S800 Support Thread
Post by: matta on February 12, 2009, 04:59:40 PM
Stitch,

I looked over the pics in you PM'd me, all seems fine comparing my PCB's against yours... which makes me think of wiring. If you PSU connected to the star ground? Hard to work out your grounding scheme from the pics.

Can you draw up a sketch and post a pic?

Cheers

Matt
Title: Re: S800 Support Thread
Post by: stitch-o on February 12, 2009, 07:07:35 PM
heh...uh. ::)
so, there is this little jumper right next to the 3rd TLO71.
It would seem that if you miss installing the jumper, the eqs loose a lot of signal and become distorted.

heh...well, live and learn.

Many many thanks Matt and others responding, having second opinions helped exercise the troubleshooting...


This this thing sounds wicked! Cheers and thanks again...
Title: Re: S800 Support Thread
Post by: matta on February 13, 2009, 11:46:10 AM
Hah Hah,

THAT will do it! Glad you found the problem.

Cheers

Matt
Title: Re: S800 Support Thread
Post by: substitute on February 21, 2009, 04:08:46 PM
I noticed R25 is marked 4k5 on the PCB, I'm using Colin's kits which came with no such value.  But it seems like I have an extra, 4k7 will this work out?
Title: Re: S800 Support Thread
Post by: matta on February 21, 2009, 04:24:14 PM
I noticed R25 is marked 4k5 on the PCB, I'm using Colin's kits which came with no such value.  But it seems like I have an extra, 4k7 will this work out?

Substitute, substitute (sorry I had to) it for 4K7 all will be well  ;D

Cheers

Matt
Title: Re: S800 Support Thread
Post by: Brolik on February 22, 2009, 04:47:31 PM
I didn't find a final conclusion on the best way to put in the styrene caps that came in colins kits.  They definitely measure more accurate in one direction than the other, and I saw that it was "better" to put the foil side (with the line) on the ground side or on the opamp output, but can't figure it.  Could someone with better schematic reading skills give me a hint?  I saw that stitch's had the lines on the square pads, how's it sound?  Could this have anything to do with the freq responses that are coming up slightly different than spec'd? Thanks in advance for your help.
Title: Re: S800 Support Thread
Post by: substitute on February 22, 2009, 07:58:15 PM
Cheers Matta!
Title: Re: S800 Support Thread
Post by: substitute on February 23, 2009, 07:55:40 AM
Does anyone have a part#, preferably, Mouser, for the Green PSU Bridge rectifier.  I mistakenly ended up with a small IC that won't fit on the board.

Thanks!
Title: Re: S800 Support Thread
Post by: Brolik on February 23, 2009, 10:58:14 AM
Substitute, I used 583-BR64 for the rectifier with success.  A little overrated, but the best fit for the board I could find.

Any help on the direction of the polystyrene cap placement, or is it too stupid a question to warrant an answer?

~Matt
Title: Re: S800 Support Thread
Post by: substitute on February 23, 2009, 12:47:28 PM
Thanks Bro.

I have been watching for replies regarding your question, I certainly don't have any answers.  I've fired up one channel for bench testing, it eq's, but I haven't gotten involved in any fine tuning or measurements. 
Title: Re: S800 Support Thread
Post by: Brolik on February 23, 2009, 02:40:14 PM
Glad to be of service.  ;D

i've got 4 out of 8 eqs up and running, with several different variations of placement direction for the styrenes.  I personnally don't hear much difference, but have not tested extensively, nor do I have accurate measurement tools.  Maybe I'll just make 2 of each variation for a little variety in my high shelf...  ;) 


Title: Re: S800 Support Thread
Post by: pedroplanet on February 24, 2009, 12:46:18 PM
power transformer question.
I'm going to buy a toroid from antek.

I have 2 options, 18v 10VA or 20v 25 VA.
Which fits better for 2 channels?

Title: Re: S800 Support Thread
Post by: mitsos on February 24, 2009, 02:04:00 PM
Pedro, I was going to buy the 2x15V, 10VA from Antek for this. Either should work. If I calculated correctly (back a few pages) each channel uses less then 30mA maximum... WAY less than these trafos can do.

BTW, how are you having these shipped? 
Title: Re: S800 Support Thread
Post by: pedroplanet on February 24, 2009, 02:13:13 PM
I asked about shipping to Brasil on ebay:
"The Priority Mail small flat rate is $13. you may fit 2 into the box for same price.   John"

here is the ebay store http://myworld.ebay.com/johnango/

I think this is the best solution for us in Brasil!

How are the cases and panels going? any news for us?
Title: Re: S800 Support Thread
Post by: pedroplanet on February 24, 2009, 11:46:45 PM
I was wondering on using the SSL 9k PSU for this project, (it's simple and seems ok for etching...)

Does anybody knows if it would work ?
Title: Re: S800 Support Thread
Post by: kazper on February 25, 2009, 12:45:06 AM
It would be fine, just omit the 48V+ parts of course.

Mnats PSU is also a excellent choice, if you have one of those sitting around.
Title: Re: S800 Support Thread
Post by: ixi on March 02, 2009, 04:58:18 PM
Hi, guys!

Have maybe someone Components list for this EQ!

Did i maybe overlook weblink or Components list somewhere ?

Thx

ixi
Title: Re: S800 Support Thread
Post by: MikoKensington on March 02, 2009, 05:13:23 PM
Here's the easiest way to get what you need.
http://www.audiomaintenance.com/acatalog/kits.html

You just need to source switches.
Title: Re: S800 Support Thread
Post by: 3nity on March 04, 2009, 03:07:44 PM
For you guys using this EQ with a 3 rail psu....
Use the 48V part with 48V relays to bypass the EQ...
Relay at the output switching to XLR (EQ bypassed)  in or From the EQ out ( EQ IN)...

 ;D
Title: Re: S800 Support Thread
Post by: kazper on March 05, 2009, 01:45:41 AM
For you guys using this EQ with a 3 rail psu....
Use the 48V part with 48V relays to bypass the EQ...
Relay at the output switching to XLR (EQ bypassed)  in or From the EQ out ( EQ IN)...

 ;D


Excellent idea...

you should be able to mod the PSU and omit a couple things and set it up for 12 or 24V also...

Title: Re: S800 Support Thread
Post by: 3nity on March 05, 2009, 07:35:51 AM
sure why not!!! thats great!
Title: Re: S800 Support Thread
Post by: mrphotodude on March 11, 2009, 04:45:35 AM
I sent a pdf and adobe illustrator file to the group email of my layout as i have had a few requests for it.
i labeled it as a mock layout!
dont go getting fancy panels made or invest money into it until you print it on a piece of paper and see how well things line up for  you!!!
This is for a dual channel in a 1U with the components mounted facing up.

Title: Re: S800 Support Thread
Post by: geoff004 on March 12, 2009, 03:32:18 PM
I'm not much of a photoshop whiz, but maybe some of you will find these helpful:

(http://www.hazelriggbrothers.com/rotary/S8001U.jpg)

(http://www.hazelriggbrothers.com/rotary/S8004.jpg)

Title: Re: S800 Support Thread
Post by: Brolik on March 19, 2009, 11:06:39 AM
Hey guys I got quite the newber question.

I just read the John Watkinson article on grounding that was posted in the Brewery section and it has left me with some questions.

In the article he notes the importance of tying pin 1 from the xlr's to the metal chassis, not to the PCB itself.  I was planning on doing both on my s800.  That is to say that I would use the input/output grounds on the board, then tie pin 1 of the xlr's together and have them all meet at the star ground point.  Am I wrong?  Should I connect the xlr's to the eq boards at all?  Should I tie the xlr's together and then to the star ground or should I tie each one to the chassis individually?  If I'm not tying the pcb input/output grounds to the xlr's then do I use them at all?

Sorry for the serious of seemingly dumb questions, but I've read so many grounding threads on this forum and they just serve to confuse me more.  Thanks in advance for any help.

~Matt
Title: Re: S800 Support Thread
Post by: RedNoise on March 25, 2009, 04:47:38 PM
Hi there ,
earlier in this thread I read : "the burgundy coloured 1k5 resistor - is it a 1 watt meant for r43?"
Colin confirmed it was 1W , but does this also confirm it's r43??

Also , I'd like to be confirmed concerning the value of the "thing" located between c22 & r35 ...

By advance , many thanks.
Title: Re: S800 Support Thread
Post by: substitute on March 25, 2009, 07:01:16 PM
yup, r43 is the burgundy 1w
the "thing" is a 0 ohm resistor, or jumper.
Title: Re: S800 Support Thread
Post by: RedNoise on March 26, 2009, 10:02:02 AM
Thanks Sub' !
Title: Re: S800 Support Thread
Post by: RedNoise on April 07, 2009, 09:56:29 AM
Hi , may I ask if the 3PDT should be a on/on ???correct???
Title: Re: S800 Support Thread
Post by: wolfgang on April 07, 2009, 10:07:49 AM
Quote
Insert Quote
Hi , may I ask if the 3PDT should be a on/on ???correct???

Yes!
Title: Re: S800 Support Thread
Post by: RedNoise on April 07, 2009, 10:10:05 AM
wow , fast response!!
Many thanks , it's time to order now!!
Cheers.
Title: Re: S800 Support Thread
Post by: craigmorris74 on April 07, 2009, 12:13:31 PM
I've read this thread but might have overlooked this, but does anyone have the part # of the bypass switch that will fit these boards?

Thanks
Craig
Title: Re: S800 Support Thread
Post by: MikoKensington on April 07, 2009, 12:25:43 PM
http://www.audiomaintenance.com/acatalog/switches.html

Is this any help?  AML has great service and they're fast.
Title: Re: S800 Support Thread
Post by: craigmorris74 on April 07, 2009, 12:40:58 PM
crap, didn't know they were the source for that too!  I just got my kits in!
Title: Re: S800 Support Thread
Post by: Tungstengruvsten on April 07, 2009, 01:17:37 PM
I have 6-10 of these switches if you are in North America - cheap!
Title: Re: S800 Support Thread
Post by: mata_haze on April 09, 2009, 03:33:54 PM
Quick one:
I have lined my S800 up using a Neutrik A1 (fully balanced +4dB in -> +4dB out) but when it comes to use it on an insert point I loose roughly 6dB .
how do you usually wire your insert cables?

After I had a look at the S800 schematic I wired mine by shorting Pin 3 to ground (PIN 2 is hot for me of course) AT THE INPUT ONLY and left the output "floating" (PIN 3 disconnected).

Yet I have this 6db drop in level, just level no lost of low end or anything like that.

any thoughts?

Best,
Mattia.
Title: Re: S800 Support Thread
Post by: matta on April 09, 2009, 05:03:58 PM
Mattia,

Does your console have BALANCED insert points? MANY/MOST don't, and run unbalanced, so you are going to get a level drop from the console side into the EQ.

To test this theory, take one of the BALANCED channels OUT an output of your soundcard back into your DAW and use a signal generator and check if you get a level drop here... my guess is much like the A1, you won't.

This then leave me to suspect the console is the culprit.

Cheers

Matt


Quick one:
I have lined my S800 up using a Neutrik A1 (fully balanced +4dB in -> +4dB out) but when it comes to use it on an insert point I loose roughly 6dB .
how do you usually wire your insert cables?

After I had a look at the S800 schematic I wired mine by shorting Pin 3 to ground (PIN 2 is hot for me of course) AT THE INPUT ONLY and left the output "floating" (PIN 3 disconnected).

Yet I have this 6db drop in level, just level no lost of low end or anything like that.

any thoughts?

Best,
Mattia.
Title: Re: S800 Support Thread
Post by: peterc on April 09, 2009, 05:20:10 PM
If you short one of the inputs to gnd you will lose 6dB of gain

Peter
Title: Re: S800 Support Thread
Post by: matta on April 09, 2009, 06:38:59 PM
If you short one of the inputs to gnd you will lose 6dB of gain

Peter

It seems he shorted it POST trying to use the unit as an insert, unless I read it wrong? Which means the gain loss it happening before it reaches the Eq?

Matt
Title: Re: S800 Support Thread
Post by: mata_haze on April 10, 2009, 05:51:27 AM
Quote from: matta
Does your console have BALANCED insert points? MANY/MOST don't, and run unbalanced, so you are going to get a level drop from the console side into the EQ.
no the console I am using does not have balanced insert points.

Quote from: Peter
If you short one of the inputs to gnd you will lose 6dB of gain
I have indeed wired the male XLR on the insert cable (SEND and therefore input of the EQ) shorting PIN 3 to ground (cold side), if I did otherwise (leaving PIN 3 floating)the level would be much less.

the RETURN XLR on the insert cable (output of the S800) has been left with PIN 3 "floating" => not connected to ground.

I did also try to bypass the unit (S800) to confirm the cable was ok by just connecting the two insert XLR together and it works perfectly...

the other test I did was to conncect the output of the S800 (using a balanced caable) to another channel line input (set at unity gain) to see how much signal I would have had and I get  0dB: which is correct.

Best,
Mattia.
Title: Re: S800 Support Thread
Post by: peterc on April 10, 2009, 01:04:05 PM
Mattia

Try wiring the return XLR like this:

XLR pin2 to hot on insert return
XLR pin 3 to cold on insert return
XLR pin 1 not connected.

It might give some level back.

REgards
Peter

Title: Re: S800 Support Thread
Post by: mata_haze on April 11, 2009, 06:42:09 AM
Quote from: Peter
Mattia

Try wiring the return XLR like this:

XLR pin2 to hot on insert return
XLR pin 3 to cold on insert return
XLR pin 1 not connected.

It might give some level back.

REgards
Peter


I'll try it and let you know.

Many thanks,
Mattia.
Title: Re: S800 Support Thread
Post by: substitute on April 11, 2009, 11:15:05 PM
Hey folks, I got a problem to sort out.  I fired up the eq's today, one channel works perfectly, the other one, not so much.  There was what I would call a really loud pulse or metronome sound in the signal.  As I turned the trim pot down the pulse sped up, I could here the audio signal underneath being affected by the eq, but it was very quiet.  When I muted the signal going to the eq the pulse stopped with the audio. 

Here's what I've tried so far...

-visually comparing the component side of the two boards, all looks well, but I can be rather unobservant.
-tried swapping the IC's between the two boards, managed to break one of the leg's but not solve the problem.

I'll post some pics tomorrow, but in the mean time if anyone has any advice or trouble shooting tips, hook a brother up!
Title: Re: S800 Support Thread
Post by: substitute on April 12, 2009, 04:27:10 PM
got 'er sorted, two bits of solder were a little too close.   :-[

These sound fantastic, totally killer on DI bass.  Thank you so much Peter and Collin for developing this project, and Matt for fielding so many questions!
Title: Re: S800 Support Thread
Post by: Engfelt2000 on April 15, 2009, 06:07:01 PM
I'm in the middle of building the box with 8 and I'm getting +12db louder from the output? Other than that it behaves normal. This occures so far on the four that I've finished so far. I doublechecked the output 47k resistors. I'm using the AML kit, which by the way is super. Any idea anyone?

Christian
Title: Re: S800 Support Thread
Post by: matta on April 16, 2009, 01:13:07 PM
I'm in the middle of building the box with 8 and I'm getting +12db louder from the output? Other than that it behaves normal. This occures so far on the four that I've finished so far. I doublechecked the output 47k resistors. I'm using the AML kit, which by the way is super. Any idea anyone?

Christian

Christian,

Have you the onboard gain trimmer to reflect unity gain? I'm almost 100% sure from your description therein lies your problem. By default those trimmers are set higher, reflecting a much hotter output... read back a few pages and I discuss how to set the trimmer.

Cheers

Matt
Title: Re: S800 Support Thread
Post by: RedNoise on April 16, 2009, 01:53:33 PM
hi guyz!
Could someone post a high res pic of the PeterC's PSU (completed)?
I have a bom mentioning 100nF 50V & 10µF 35V being lythics...Is that correct??(I do not use 48v for this project)
As you know I'm noob  , I just compare with 9k or 1176 psus which use film or ceramic caps.So I though I should ask before soldering.
By advance , many thanks.

Edit : I imagine 10µF are lytics.If 100nF are lytics too where're the + ?? Are 10µF 25V good (towards 35V) ??
Title: Re: S800 Support Thread
Post by: peterc on April 16, 2009, 03:57:43 PM
Rednoise

you are correct, 100nF are poly caps, 10u are elcos.
Title: Re: S800 Support Thread
Post by: RedNoise on April 16, 2009, 04:45:16 PM
Thanks Peter! ;)
Would 25V do the trick?? (8 x S800)
Title: Re: S800 Support Thread
Post by: Engfelt2000 on April 16, 2009, 05:14:53 PM
Thanks for your reply Matt. I allready tried the trimmer, but I only got it down a couple of dBs.  *Hmm .. I'll look at it again.


Christian

I'm in the middle of building the box with 8 and I'm getting +12db louder from the output? Other than that it behaves normal. This occures so far on the four that I've finished so far. I doublechecked the output 47k resistors. I'm using the AML kit, which by the way is super. Any idea anyone?

Christian

Christian,

Had to set the onboard gain trimmer to reflect unity gain? I'm almost 100% sure from your description therein lies your problem. By default those trimmers are set higher, reflecting a much hotter output... read back a few pages and I discuss how to set the trimmer.

Cheers

Matt
Title: Re: S800 Support Thread
Post by: mitsos on April 17, 2009, 02:32:16 AM
Thanks Peter! ;)
Would 25V do the trick?? (8 x S800)
The 25V is the maximum rating of the cap, so it should never see more than that, right?  If you run your circuit with a 15V trafo, you should be fine, because, after rectification, the caps will see about 21V (15V x 1.414).  If you do 18V, you may want to consider 35V caps, because at best, you will be running the 25V ones at the limit (25V after rectification).  In this case, if your mains goes over 220 (or whatever they use in France), your power trafo's output will also rise and could easily shoot you into the danger zone for the 25V caps. 



(Edited for clarity)
Title: Re: S800 Support Thread
Post by: RedNoise on April 17, 2009, 07:39:27 AM
Thanks Peter! ;)
Would 25V do the trick?? (8 x S800)
The 25V is the maximum rating of the cap, so it should never see more than that, right?  If you run your circuit with a 15V trafo, you should be fine, because, after rectification, the caps will see about 21V (15V x 1.414).  If you do 18V, you may want to consider 35V caps, because at best, you will be running them at the limit (25V after rectification).  In this case, if your mains goes over 220 (or whatever you use), your power trafo's output will also rise and could easily shoot you into the danger zone for those caps. 
Thanks Mitsos!
Title: Re: S800 Support Thread
Post by: substitute on April 18, 2009, 11:12:39 PM
Hey guys, I'm having a little trouble with my green PSU, I'm using the amtek 236103 which is spitting out 18V but I'm getting +/- 11VDC coming out of the psu.  Initially I had the 2k7 resistors installed as mentioned earlier, then I changed to the 2k2's that the BOM calls for with no change in voltage.  I'll spend some more time tonight experimenting with different resistor values but beyond that I really don't know how to trouble shoot this. 

THANKS
Title: Re: S800 Support Thread
Post by: craigmorris74 on May 06, 2009, 11:13:14 PM
I want to double check somthing before I attempt it.  I've got a Urei graphic EQ that I hate with a 36V power supply, and a Power One 48V supply that turns down to 36V.  I want to make a couple of stereo S800's, any reason these wouldn't be suitable.

Thanks,
Craig
Title: Re: S800 Support Thread
Post by: substitute on May 06, 2009, 11:17:47 PM
The recommended voltage is 15-18v, double that seems like a lot... to me. 

P.S. got my PSU working
Title: Re: S800 Support Thread
Post by: craigmorris74 on May 06, 2009, 11:30:51 PM
Wouldn't 36V give +18 and -18, or am I just incredibly, hopelessly confused?
Craig
Title: Re: S800 Support Thread
Post by: substitute on May 07, 2009, 07:25:55 AM
It seems like when threads get really long it can be hard to get people's attention, you might want to make a new post about adjusting your supply to +/- 18v that isn't really project speciffic.  I'll try my best to help though, I get confused a lot.  I can't seem to find any info on the "power one", but measuring the DC voltage on the S800 hundred boards by putting the com lead of my meter on the ground terminal and the hot lead on the + or - V terminal I measure +/- 18v respectively.  So, if you can get those measurements coming out of your supply, seems like a deal.
Title: Re: S800 Support Thread
Post by: Brolik on May 07, 2009, 05:51:09 PM
The power supply that is spitting 36v isn't much good unless you can get the +/- voltage out of it.  If you had a 36v transformer with dual secondaries you'd be on your way, then using a simple greenpre psu or something similar would work for you (although it would prob run pretty hot if it was dual 36v secondaries).  The price of a power supply kit is so nominal ($22 on diypartssupply.com) that there's little reason not to start fresh as far as I can tell.  between that and a small 20v dual secondary transformer, your talkin $40-50.  Prob leave off the +48v too as we are talking about an eq and not a pre... Hope that helps?
Title: Re: S800 Support Thread
Post by: craigmorris74 on May 07, 2009, 06:36:45 PM
Yep, the 36V supply won't work. Got a bit confused there.
How about using the Urei supply, as the schematic shows a +18 and -18 (See schematic below)?  Just trying to use the stuff I have available before spending any more money.
(http://www.angelfire.com/ky3/craigorris74/urei535.JPG)
Thanks,
Craig
Title: Re: S800 Support Thread
Post by: substitute on May 07, 2009, 10:05:12 PM
looks pretty right on to me.  You should probably measure the voltage it puts out just to make sure it's on the up and up. 
Title: Re: S800 Support Thread
Post by: craigmorris74 on May 07, 2009, 10:13:07 PM
Getting about +-18.3.  Would that be too high?
Thanks,
Craig
Title: Re: S800 Support Thread
Post by: substitute on May 07, 2009, 10:39:40 PM
I'm using the green PSU with the 2k2 resistors swapped out for 2k7 as mentioned earlier in this thread.  The + rail is a little over 18 and the - is a little less and the EQ's run great.  Sounds like your good to go.
Title: Re: S800 Support Thread
Post by: craigmorris74 on May 07, 2009, 10:47:19 PM
Excellent, thanks for the help, substitute.

Craig
Title: Re: S800 Support Thread
Post by: rascalseven on May 20, 2009, 04:04:37 PM
Finally finished my own 8-channel:

(http://i26.photobucket.com/albums/c107/rascalseven/S-800_8-pack.jpg)

A long time in coming.  This is what I wanted when I drew the first schematic back in January 2008.  Thanks to PeterC for doing the layout and making pcbs, and to Purusha for making the 8-channel case a reality (and for making it look nicer than my original concept to boot!).

Took me awhile to get time enough to finish 8-channels for myself, but now it's done, and I'm really looking forward to using them on some upcoming rhythm sessions.

Peace to all,

JC
Title: Re: S800 Support Thread
Post by: 3nity on May 20, 2009, 04:41:40 PM
looks really nice...i have 2 finished boards waiting to be racked but not enough cash to complete it!! arg...
Title: Re: S800 Support Thread
Post by: Hammond on May 22, 2009, 10:22:07 AM
Sorry for the stupid question,
In the Purusha dual case there are 4 metal corners, what's are these for?
Thanks ::)
Title: Re: S800 Support Thread
Post by: Hammond on May 23, 2009, 03:08:42 AM
no one? :-\
Title: Re: S800 Support Thread
Post by: RedNoise on May 23, 2009, 05:01:38 AM
To Hammond :
1U??? 4U???
Have you got pics of your metal corners?Have you looked into the "S800 mounting instruction thread" ??
With pictures it will be easier I think.
Title: Re: S800 Support Thread
Post by: Holger on May 30, 2009, 12:59:44 PM
Finished my S800 today.

(http://audiofor.tv/diy/ProjectFotoFolder/s800/s800-front.jpg)

(http://audiofor.tv/diy/ProjectFotoFolder/s800/s800-open.jpg)

(http://audiofor.tv/diy/ProjectFotoFolder/s800/s800-rear-open.jpg)

This project was very time consuming...
Will never again do a project with 10000 off-board wires, but  I was young and needed the case  ;)
I used a JLM AC/DC, I shielded the channel 8 XLRs with µ-metall.
I like the EQ.

Edited 07/31/2011: relinked pictures
Title: Re: S800 Support Thread
Post by: MikoKensington on May 31, 2009, 02:05:01 AM
That stacking technique is a "why didn't I think of that" build.  Looks great!
Title: Re: S800 Support Thread
Post by: Holger on May 31, 2009, 06:27:09 AM
I'm not sure if the stacking method is better than the Matta method building it up from the side panel.
Maybe my method makes maintenance it a little bit easier.
I hope I never have to open the beast again...
Title: Re: S800 Support Thread
Post by: kml23956 on June 06, 2009, 08:31:18 PM
I am building the 8 channel version of this.  Does anyone know the current needed for one card?  I see that I need +- 18v but what is the current required?
Title: Re: S800 Support Thread
Post by: signalflow on June 06, 2009, 08:44:38 PM
I am building the 8 channel version of this.  Does anyone know the current needed for one card?  I see that I need +- 18v but what is the current required?

Check the datasheets for the chips used.  I'm pretty sure the 5532 is 10mA but check to be positive not sure about the TL071 same ball park maybe.

make sure to check the correct mfg data it may vary from company to company.

-Casey
Title: Re: S800 Support Thread
Post by: sintech on June 07, 2009, 09:37:27 AM
I am building the 8 channel version of this.  Does anyone know the current needed for one card?  I see that I need +- 18v but what is the current required?

Running eight here no problem, using a 50VA transformer with heatsinks on the regulators. Good luck with your build, it's a beautiful eq.
Title: Re: S800 Support Thread
Post by: kml23956 on June 07, 2009, 05:26:53 PM
thanks for the help
Title: Re: S800 Support Thread
Post by: kml23956 on June 16, 2009, 10:32:24 PM
OK.  I finally have Tat's eight channel case reworked so I can fit everything in it.  What wire should I use to hook this thing up?  Matta has pointed out that there are almost 400 wiring connections that must be made.  Happy, happy, joy, joy.  So what manufacture of wire do you think would work best?
Title: Re: S800 Support Thread
Post by: ewald on June 17, 2009, 03:27:34 PM
Hi kml,

If you're opting on matta's method of pcb orientation, you'll find that bit of planning will go a long way, as space is severely limited in those cases! Ie measure wire distances from each pcb to destination and use wire no thicker than +/- 2mm in diameter(14awg) as 400 odd wires toghether will become rigid/stiff consequently making it hard to manoeuvre/fit them all inside. 

AND make sure of each connection, with DMM if you must, before closing up-you'll never want to go in there again! ;)- I ,idiot that i am, somehow skipped the nulling proc on one channel and only found out after finishing up ::) what a joke having to go in there again!(not wished upon my greatest enemy!)

cheers

Ewald
Title: Re: S800 Support Thread
Post by: Brolik on June 17, 2009, 04:06:22 PM
I present to you my first GroupDIY project!  ;D I've made a stompbox or two before, but this is a whole new kettle of fish!!

(http://getbrolik.com/Sommer/IMG_4504.jpg)
(http://getbrolik.com/Sommer/IMG_4506.jpg)
(http://getbrolik.com/Sommer/IMG_4507.jpg)
(http://getbrolik.com/Sommer/IMG_4510.jpg)
(http://getbrolik.com/Sommer/IMG_4511.jpg)

Probably should've tried something a little easier for my first go, but I'll tell you what I now know how to fly some damn wires now.  Ewald ain't lyin' about not wanting to open it back up, I forgot to put the power led in at first. I almost cried. 

As you've by now noticed I'm missing the sifams on the last two channels, anyone got some spare sets?  I could really use a pair right about now. 

Thanks to everyone who put this project together! I finally have some decent eq's!!  ;D  ;D  ;D

Matt Sommer

Title: Re: S800 Support Thread
Post by: ewald on June 17, 2009, 04:43:33 PM
Congrats matt, feels good, d'n it! Nice move on the styrene's-nothing beats bashing your head at 2 in the moring cus your hpf WON'T work! :'(
Title: Re: S800 Support Thread
Post by: kml23956 on June 19, 2009, 11:04:39 AM
Thanks for the replies.

I have ordered my wire and will post pics as soon as it is done.  Can't wait.

Kevin
Title: Re: S800 Support Thread
Post by: Dr nEon on July 10, 2009, 05:05:31 PM

 Wow,well done...!..

 great pics ,but my browser is having immense difficulty in loading them all..

OK I have a question about unity gain with the S800 , in unbalanced mode.. I have read this entire thread a number of times.

So..yeah we have the trimmer on board , and I've set it for unity , in a balanced situation.

Now..I rig it up in an unbalanced situation..i.e my home studio where it will live , and so I have, our old friend, the 6dB level drop.

I can readjust the trimmer for unity in unbalanced mode, but my question is if this is the best remedy , or should the trimmer be left alone , and some other resistor values be changed?

Only asking , since in other circuits like the calrec eq,input res could be changed , and the vca i/p resistors on the gssl were the best spot.

I cant find anywhere, the official word on the purpose of the trimmer; I'm assuming it's to set balanced unity/CMR...but is it ok ,or a bit crude perhaps , to use it as a 6dB compensation boost ?

any thoughts anyone?

Cheers

nEon.
Title: Re: S800 Support Thread
Post by: Dr nEon on July 11, 2009, 07:21:37 AM

any takers on the above question?

cheers!

nEon.
Title: Re: S800 Support Thread
Post by: Harpo on July 11, 2009, 10:02:31 AM
Hi nEon,
looking at the schematic and leaving the trimmer (shunt in a U-pad) alone, R36 would need to be increased from 15K to 30K and compensation cap C21 decreased from 100pF to 47pF for your required +6dB unbalanced gain. Could be made switchable by paralleling a 2nd 30K and a 2nd 47pF to alter between balanced and unbalanced mode. (IMHO C21 could be kept at 47pF. The NE5532 is unitygain stable and the LPF increase from 106kHz to 225kHz for balanced operation seems safe and far enough outside the audible range to get noticed, i.e -0.034dB vs. -0.134dB tested at 20kHz). Another approach could be to measue the trimmer for the required shunt resistor values for both operation modes. Just my 2ct.
Good luck.
Title: Re: S800 Support Thread
Post by: Dr nEon on July 12, 2009, 08:02:42 AM

Hey Harpo!

Many thanks for your great ideas!

Since I'll probably only use this in an unbalanced setup (for the foreseeable future, or until I get a desk with a balanced patchbay!) , then I would happily just set the trimmer for unity gain in that mode .In the future I could simply open the box up again and readjust the trims when I have a  balanced setup .

 However,aligning for unbalanced unity made me worry about hitting the -ve input of U1 too hard , once i measured it  with a +4dBv tone coming in from the desk, and I'm not sure just how much the TL071 can take,on its inputs. Maybe I'm worrying over nothing...please would someone tell me if I am!

If my concerns make sense, then I'd leave the shunt nulled for unity in balanced mode, and go for your elegant solution of boosting the output instead. 

OTOH if I'm worrying (again!) over nothing , then I'll just set and forget the trimmer..for now...

Also, that's a brilliant level switching scheme,Harpo!...thing is ..ironically....I've made other units switchable,ssls etc, to handle unbal insert chain scenarios/when I want a balanced mastering chain , but I think I'm only gonna need to use these s800 eqs over unbal insert points,so I was hoping to keep it simple.

Thanks again and Cheers!

nEon.
 
Title: Re: S800 Support Thread
Post by: Harpo on July 12, 2009, 02:44:04 PM
my pleasure.
No worries about hitting the TL071 input too hard. Your +4dBV or +6.218dBu is already reduced to max -0.3dBu by the at least -6.5dB U-pad with series resistors R3+R4 and the 10K shunt trimmer/rheostat in cw position, so your 1.585Vrms/2.24Vpk sending device is 0.748Vrms/1.057Vpk max after this pad.
A TL071 has common-mode input voltage range of at least +/-11V and output voltage swing of +/-10V .. +/-13.5V, depending on load. This diff.amp at input stage is set for voltage gain of 10 or +20dB for weak souces, resulting in a gain range from zero to +13.5dB, adjustable by your trimmer.
Title: Re: S800 Support Thread
Post by: Dr nEon on July 13, 2009, 05:14:10 AM

Aha! Ok, so I was worrying about something pretty small, as far as the input voltage range of the tl071 is concerned.

Looking again at the TL071 data sheet , I understood it better ,after reading your explanation Harpo.

So I'll just set the shunt trimmer for unity in unbalanced mode , and start listening instead of worrying!

I've learned something along the way!

Cheers!

nEon.

Title: Re: S800 Support Thread
Post by: buschfsu on July 14, 2009, 12:33:06 AM
are there boards still around for this?
Title: Re: S800 Support Thread
Post by: MasonAtom on July 14, 2009, 10:49:56 AM
Hoping to finally get started on a 2 channel S800 fitting in a 1U rack.

Anyone got a drill pattern for the front panel pots?

Thanks.

Mason
Title: Re: S800 Support Thread
Post by: peterc on July 14, 2009, 04:09:00 PM
Hi all

I am doing another run of these, check this thread

http://www.groupdiy.com/index.php?topic=33831.0

Peter
Title: Re: S800 Support Thread
Post by: substitute on July 14, 2009, 10:00:21 PM
Quote
Hoping to finally get started on a 2 channel S800 fitting in a 1U rack.

Anyone got a drill pattern for the front panel pots?

I did my own front panel, I don't really have a layout, I just imported the graphic of tat's cases to illustrator, scaled it to be 19" wide, and used the ruler tool to take measurements then transfered those to my panel.

I'm happy with how it came out but I had to mount the pots off board to make it work.
Title: Re: S800 Support Thread
Post by: MasonAtom on July 15, 2009, 07:00:22 AM
Quote
Hoping to finally get started on a 2 channel S800 fitting in a 1U rack.

Anyone got a drill pattern for the front panel pots?

I did my own front panel, I don't really have a layout, I just imported the graphic of tat's cases to illustrator, scaled it to be 19" wide, and used the ruler tool to take measurements then transfered those to my panel.

I'm happy with how it came out but I had to mount the pots off board to make it work.

hmm... thanks for the idea, I can probably import that graphic into QCad which is what I use for all my layouts.

Mason
Title: Re: S800 Support Thread
Post by: RedNoise on July 18, 2009, 10:22:00 AM
Hi ,
I'm finishing mine , but I mesure 15VDC @ the led connector...Is this normal?Did you add a resistor on each board for each led?
(All IC installed)
Thanks.
EDIT : Led connected and then voltage droped to 3,25VDC...
Sorry!
Title: Re: S800 Support Thread
Post by: Dr nEon on July 21, 2009, 02:12:28 PM

 Hi all!

I've been testing a whole bunch of electro caps, mainly in positions which are obviously in the signal path. 22uFs at C1&2,C17 etc.. and C23/26 output 100uFs.. ...using sockets to try out all the brands I have kicking around.

I haven't bothered with the 22uFs in positions C15 and C16 yet. I'm not sure how much influence these have, sonically. I'm trying to understand the purpose of these two caps...are they decoupling?

I'd appreciate an education from someone who can read this circuit better than I!

BTW it IS a lovely eq!

cheers

nEon.
Title: Re: S800 Support Thread
Post by: Dr nEon on July 23, 2009, 06:10:32 AM

..any thoughts on this one , anyone ??

 what are C15 and C16 doing?

 many thanks in advance

 nEOn.
Title: Re: S800 Support Thread
Post by: peterc on July 23, 2009, 07:59:22 AM
PSU decoupling.

Regards
Peter
Title: Re: S800 Support Thread
Post by: Dr nEon on July 23, 2009, 01:00:33 PM

 Cheers Peter!!

 OK so I was along the right lines... must be learning!

I'll just leave the pana Fcs in place then, at those spots...  I've found elna's to be my most preferred cap in the signal path places which I mentioned , but I assume that there's no point comparing anything in the psu decoupling positions, as the Fcs a decent cap anyway..

Big thanks , Peter , and well done on this lovely pcb!

nEon.
Title: Re: S800 Support Thread
Post by: RedNoise on July 25, 2009, 06:08:21 AM
Actually calibrating my boards , I notice a -0.5 dbu when switching eq IN.(All *pass off , gains pots centered)
Did someone have the same issue?Could I consider this "normal" ?
Title: Re: S800 Support Thread
Post by: RedNoise on July 29, 2009, 12:06:02 PM
Hi...
I have a problem with 4 of my 8 boards...I checked every solder & resistor twice...The Only difference I noticed is :
-I used 220µF 35V instead of 50V (CPSU & CPSU1)
-I used 470µF 35V instead of 16V (C3 & C4)
The issue is that I can meter [email protected] pins of DIP8 (15v & -15V are well @ pins 4 & 8 -5532- and pins 4 & 7 -TL071-)
As the problem is the same with four boards , I fear a repetited error.


Does someone have a idea where to look at?

Edit : I use Collins kit , but Electrocaps have been replaced by Panasonics.
Title: Re: S800 Support Thread
Post by: sysexguy on July 31, 2009, 09:37:15 PM
Hi, just got a partially done unit (8ch) off the board and I'm working on a plan.  I think I may have an elegant way to minimize the headaches of completing this build. If anyone has some comments or sees something I missed, please speak up

I've taken 8 of the mono (single gang) pots and ground down the lugs so that they can be inserted all the way into the pcb. The center pot of each strip (Lmid-level) lines up with the chassis holes. By grinding down the lugs I get enough clearance for the adjacent freq pots and (just barely) enough room to clear the mounting screws on one side. I will have to grind down 2 of the base screws (all unused) to align the cards vertically but that's easy. The remaining pots must have flying leads but this way, they are short and sweet.

I also thinking I should go for a relay bypass board mounted between the db25s. This would mean only needing 9 wires running to the front panel as the led and the switch can share the same wires and the 3pdt can be replaced with a spst. The bypass on the pcb would then be jumpered to the on position.

The front panel Led particularly the overall power led will be glued to the front panel (as it falls smack right where a pcb goes). I'm thinking I may just want to give a little extra space for those leds to be clean (and not shorting). Instead of mounting the front panel to the sides then a spacer and the mounting panel with a nut behind, I'd put the mounting panel in front of the sides.

I'll then have lots of room to deal with the psu.

The boards can then be secured with spacers and a long threaded rod.

TIA, Andy

 
Title: Re: S800 Support Thread
Post by: outoftune on August 09, 2009, 06:11:25 PM
anyone know of a 3pdt toggle type switch that will fit into the purusha 1U case?
Title: Re: S800 Support Thread
Post by: Davo on August 09, 2009, 06:55:06 PM
Any mini 3pdt should work... I used this one:
http://www.mouser.com/Search/ProductDetail.aspx?qs=sGAEpiMZZMvudeGI7i40XO%252bnGhp8Hy%252bJe46O%2fBjy5XE%3d

cheers
dave
Title: Re: S800 Support Thread
Post by: sysexguy on August 09, 2009, 08:19:26 PM
I'm wiring the same switch myself as we speak + Mouser's now ships free to Canada for orders over $200 which applies for this project's switches. (came in 24 hours wow!)

Andy
Title: Re: S800 Support Thread
Post by: sysexguy on August 13, 2009, 07:38:10 PM
Hi, I've now wired up one channel for my first tests and when all the pots are centered and the hi pass is off, the sound is significantly darker that bypass. All bands and switches are working and I'm digging the action in the LF and LMF. Noise is very good as well and I haven't bumped the psu up to 18 yet (we're at +-15 stock green psu).

Any ideas what I may need to look at or is that kinda normal as the center detent is a mechanical approximation of 0 boost/cut?

very excited now!!!!!!

TIA,

Andy
Title: Re: S800 Support Thread
Post by: sysexguy on August 13, 2009, 09:02:11 PM
more tests, the dip is in particular between 2k and 6k

Andy
Title: Re: S800 Support Thread
Post by: 3nity on August 14, 2009, 09:31:10 AM
on the board there are small jumpers make sure you dont forget them!
but check carefully as theres a tiny one!!
Title: Re: S800 Support Thread
Post by: sysexguy on August 14, 2009, 09:39:54 AM
Hi Jorge, tiny one tucked under U3? got it....so you're saying my observations are abnormal for this project? I need to keep searching....sometimes it's easier to troubleshoot when the whole shebang doesn't work at all....but it's more fun when audio passes and all the controls work but....

Andy
Title: Re: S800 Support Thread
Post by: 3nity on August 14, 2009, 09:52:51 AM
but you said you have 8 boards?
check another 1...

Title: Re: S800 Support Thread
Post by: 3nity on August 14, 2009, 10:32:39 AM
For schematics look into the G-mail account and search on it!
Thanks
Title: Re: S800 Support Thread
Post by: sysexguy on August 14, 2009, 11:25:25 AM
Yup already have the schematics, I wanted to get one installed before I paint myself in a corner building the "ship in the bottle"....trying another is a good plan, thanks

Andy
Title: Re: S800 Support Thread
Post by: sysexguy on August 15, 2009, 11:27:33 AM
mybad  ::) shouldn't have been a hotdogger..... pulled the OPA's and put in trusty tl071's and presto works perfect.

Now,  gotta find out why.....the green psu isn't big enough for a rack full of 8 ch's with opa's by a long shot but I thought I could power one channel for testing purposes.....I guess that's a probable cause. Any other ideas?

Btw, for future builders, r43 appears twice on the schematic, the 47k resistor marked r43 connected to pin 2 of u3 is r46

Thanks,

Andy

Title: Re: S800 Support Thread
Post by: 3nity on August 15, 2009, 04:38:17 PM
what you were using Burr Brown in there?
Thanks
Title: Re: S800 Support Thread
Post by: sysexguy on August 15, 2009, 07:13:16 PM
opa134's for the tlo71's and a opa2134 for the 5532

Andy
Title: Re: S800 Support Thread
Post by: adrian on August 17, 2009, 05:00:56 PM
hello everyone!
i've just finished 4 S800 eq, works fine!
i saw yours and they look fantastic!
what is the reference of these sifam knobs?
is there a good place to buy it in europe?
thanks!
adrian'


Title: Re: S800 Support Thread
Post by: substitute on August 17, 2009, 10:14:35 PM
I seemed to have smoked one of my channels ::)

I've had both working fine for a few months, then tonight I fed one a signal that I guess was too hot.  It sort of farted and now isn't passing audio.

Where should I start?

 
Title: Re: S800 Support Thread
Post by: RedNoise on August 18, 2009, 05:55:49 AM
I seemed to have smoked one of my channels ::)
I've had both working fine for a few months, then tonight I fed one a signal that I guess was too hot.  It sort of farted and now isn't passing audio.
Where should I start?

Voltages , then change 5532?

Title: Re: S800 Support Thread
Post by: substitute on August 18, 2009, 07:53:48 AM
I doesn't look like there's much in the way of voltages on the schematic, but since I have one working channel it shouldn't be too hard to a/b the two...

Should I check things out with a signal running through or just powered up?
Title: Re: S800 Support Thread
Post by: detonator on August 18, 2009, 08:35:34 AM
I don't want to be rude or offensive, but besides a blurry image of the overlay I can't find anywhere a descent PCB layout. Does someone have a copy of this? I'm really looking forward to build this project.
Title: Re: S800 Support Thread
Post by: RedNoise on August 18, 2009, 08:54:48 AM
I doesn't look like there's much in the way of voltages on the schematic, but since I have one working channel it shouldn't be too hard to a/b the two...

Should I check things out with a signal running through or just powered up?

I meant checking dip8 voltages , if good then change 5532 to start, then TLO...etc.


Detonator : I have no hi res pics of the pcb , but PeterC is "collecting" orders in the BM:
http://www.groupdiy.com/index.php?topic=33831.0
Title: Re: S800 Support Thread
Post by: detonator on August 18, 2009, 01:04:39 PM
Thanks for the info. I already saw that PeterC "might" do an other 100 boards. The reason why I'm asking is that I want to DIY.
Title: Re: S800 Support Thread
Post by: peterc on August 19, 2009, 03:30:26 AM
The order is in the works, should be here in a couple of weeks...... :)
Title: Re: S800 Support Thread
Post by: evilcat on August 26, 2009, 07:38:27 AM
I'm gonna make a mono S800 (1st project).
Do you think it's possible to make it in a 1U, half rack witdh case ? I've tried to contact Purusha but his mail box is full !
I'm looking for the knobs, what is the spacing between the pot ?

Thanks

Ben A.
Title: Re: S800 Support Thread
Post by: RedNoise on August 26, 2009, 01:33:26 PM
Salut Evil!
1U rack : no pb , spacing between pots is approx 25mm.
Which knobs are you looking for?
Title: Re: S800 Support Thread
Post by: evilcat on August 27, 2009, 04:35:51 AM
Salut RedNoise !

I don't know yet, that's why I'm asking. 25mm is not wide ! I'm gonna look at small knobs !

I'm looking for switch too. What kind of switch would I need for this project ? Why the bypass has so many poles ? Is there a power switch  (I don't find the schematic of this project !!!) ?
Title: Re: S800 Support Thread
Post by: RedNoise on August 27, 2009, 07:30:14 AM
switches :
SPDT on/on
3PDT on/on for bypass

25mm is between each center of each pot.AML have a very good quality/price kit regarding the components.You just have to get the switches separately.
Banzai have some chinese Davis knobs.(quite pretty , not so large.)

Pm me your email if you want!
Title: Re: S800 Support Thread
Post by: sysexguy on September 06, 2009, 11:10:18 PM
Well, happy day, just a few tweaks left but everything works.....

(http://www.diffusion-audio.com/images/s800p1.jpg)
(http://www.diffusion-audio.com/images/s800p5.jpg)
(http://www.diffusion-audio.com/images/s800p8.jpg)
(http://www.diffusion-audio.com/images/s800p13.jpg)
(http://www.diffusion-audio.com/images/s800p20.jpg)

This was quite a "ship in a bottle" meets rubic's cube and I learned a lot from this thread so thanks to all......

The psu is from welbornelabs, NO MOLEX!!!, skipped the db25's. The units sounds great, I think I'm going to take apart the front panel once again and redrill to 9/32" (I drilled the holes to 17/64") as a couple of controls are biting. I also need to insulate the led leads, recalibrate the levels once the unit burns in and a couple of other tiny issues.

Andy
Title: Re: S800 Support Thread
Post by: marshman on October 16, 2009, 07:46:03 AM
Quick question,

I have read this thread 3 times and not seen this referenced.

On the green PS, the 1000uf caps are only 10v? I am going off the V6_5-8-7 parts list.

Is this correct? That seems a little low.

Thanks!

mm
Title: Re: S800 Support Thread
Post by: pedroplanet on October 16, 2009, 11:57:34 AM
I'm about to finish my s800, using mnats psu.

After reading the trhead, I'm still in doubt on what voltage to use +15, -15 or +18 -18?
Title: Re: S800 Support Thread
Post by: marshman on October 16, 2009, 12:16:20 PM
Pedro,

Either is fine. You might get some extra life out of the chips at +/-15.

mm
Title: Re: S800 Support Thread
Post by: craigmorris74 on October 17, 2009, 11:33:34 AM
Thanks for everyones help with my S800.  Got two channels working, except for the High Mid band on one channel.  Swapped U5 with the working channel, and got no change.  Any particular part that might cause this problem?

Thanks,
Craig Morris
Title: Re: S800 Support Thread
Post by: sysexguy on October 18, 2009, 09:11:23 AM
BTDT (been there, done that), check the pads going to the HM pot for a solder bridge.

andy
Title: Re: S800 Support Thread
Post by: craigmorris74 on October 18, 2009, 05:33:04 PM
Thanks for the tip, Andy.  I'll check this first.
Craig
Title: Re: S800 Support Thread
Post by: Ngr on October 22, 2009, 02:30:16 PM
Finished my unit.
It works ok, but I have a few problems:
frequency range of the parametric filters seems to be wrong, the frequencies marked on Purusha's case do not correspond to what it's actually happening: boosting 1.5k i.e. results in boosting a lower frequency and generally speaking the pot span does not seem to be correct with the frequencies marked on the case.
And more, when in bypass, the unit output is higher (0.6-0.t dB) than when eqs are on with all gain pot at zero.
Any chance to fix those problems?
Title: Re: S800 Support Thread
Post by: Benny on October 22, 2009, 03:05:01 PM
Hey there,

I think you can set your eq to unity gain with an onboard trimmer.

Ben
Title: Re: S800 Support Thread
Post by: Ngr on October 23, 2009, 04:25:12 AM
trimmer affects unit output in both bypass and on position...
Title: Re: S800 Support Thread
Post by: craigmorris74 on October 26, 2009, 09:49:12 AM
I resoldered a few componenets, and now the high-mid is working, but now both channels have a synth like tone that changes when the EQ's are bypassed.  Any thoughts as to what could cause this (was very quiet before).

Thanks,
Craig
Title: Re: S800 Support Thread
Post by: Hammond on November 06, 2009, 03:05:36 PM
Quick question, where do i connect the bypass led?
Title: Re: S800 Support Thread
Post by: RedNoise on November 06, 2009, 03:08:08 PM
in the two holes between Sw1 & the next pot...IIRC.
Title: Re: S800 Support Thread
Post by: evolver on November 09, 2009, 02:37:10 PM
Hey everyone

i am very much a n00b and wanted to run this by some people with more experience. To date my experience has been putting together some SCA preamps -- which work. I ordered the following:

AML electronics and knobs kit x2
Purusha's case + PCB&PSU boards

I put all of the electronics from one of the AML kits on a board this weekend. I  am now trying to sort out what further parts i need to order to finish this bad boy.
 
It seems i need the following for the S800 itself:

(i am getting two of the PCB parts, since i am building a stereo unit)

S1, S2, S3  are 6 x SPDT
I read on here that the following would work for the SPDT:  Mouser  108-1M31T1B1M1QE-EVX (http://www.mouser.com/Search/ProductDetail.aspx?R=108-1M31T1B1M1QE-EVXvirtualkey12040000virtualkey108-1M31T1B1M1QE-EVX)
S4   is   2 x 4PDT
I did not see a potential part listed on this thread. Can anyone offer any recommendations ?   
Input  XLR-F x 2 
Output  XLR-M  x 2
1 x LED ( i think i only need 1 for a stereo unit, correct ?)
Is there anything special i should look for in getting the in/out and LED parts ? 
PL1, PL2  are  2 x Molex 3
PL3  is 1 x Molex 3 Big
the molex connectors are the little white socket-thingies that let you easily plug and unplug
a powersupply correct ? are there specific part numbers recommended that will fit more easily onto
the PCB ?   


For the PSU (non-48v) i need the following:
Capacitors
4 x 100nF      mouser part: 647-USR1H0R1MDD ( http://www.mouser.com/Search/ProductDetail.aspx?R=USR1H0R1MDDvirtualkey64700000virtualkey647-USR1H0R1MDD )
4 x 1000uF      mouser part: 647-UHM1A102MPD6 ( http://www.mouser.com/Search/ProductDetail.aspx?R=UHM1A102MPD6virtualkey64700000virtualkey647-UHM1A102MPD6 )
2 x 10uF / 35v   mouser part: 647-UKL1V100KDD1TA    ( http://www.mouser.com/Search/ProductDetail.aspx?R=UKL1V100KDD1TAvirtualkey64700000virtualkey647-UKL1V100KDD1TA )
Resistors
4 x 220   mouser part: 271-220-RC   ( http://www.mouser.com/Search/ProductDetail.aspx?R=271-220-RCvirtualkey21980000virtualkey271-220-RC )
2 x 2k2   mouser part: 71-CCF07-G-2.2K  (  http://www.mouser.com/Search/ProductDetail.aspx?R=CCF072K20GKR36virtualkey61300000virtualkey71-CCF07-G-2.2K  )
         
Misc      
2 x 1N4007    mouser part: 512-1N4007   ( http://www.mouser.com/Search/ProductDetail.aspx?R=1N4007virtualkey51210000virtualkey512-1N4007 )
1 x LM317   mouser part:  512-LM317T ( http://www.mouser.com/Search/ProductDetail.aspx?R=LM317Tvirtualkey51210000virtualkey512-LM317T )
1 x LM337   mouser part: 512-LM337T ( http://www.mouser.com/Search/ProductDetail.aspx?R=LM337Tvirtualkey51210000virtualkey512-LM337T )
         
The following two i filled in from scanning this thread for recommendations. Are these
still considered good choices ?          

1 x Bridge Rectifier   mouser part: 583-BR64  (  http://www.mouser.com/Search/ProductDetail.aspx?R=BR64virtualkey58300000virtualkey583-BR64 )      
1 x Transformer   mouser part: 553-FP30-400  ( http://www.mouser.com/Search/ProductDetail.aspx?R=FP30-400virtualkey55310000virtualkey553-FP30-400 )



One thing i did not see when scanning the thread was what sort of cable i needed to connect the PSU
to the PCBs via the molex connectors. is this a "one sized" standard type of cable or is there something
more specific that i will need?


Sorry for all the questions -- i am trying not to make any stupid mistakes in doing this build. if you can chime in on a point or two and not the whole thing i would still be very appreciative.
Title: Re: S800 Support Thread
Post by: Brolik on November 09, 2009, 03:15:42 PM
Quote
One thing i did not see when scanning the thread was what sort of cable i needed to connect the PSU
to the PCBs via the molex connectors. is this a "one sized" standard type of cable or is there something
more specific that i will need?

couple of 22 gauge wires with the right molex connectors will do the trick. I think its .156 inch pitch. Mouser part # 538-09-50-3031 should work. You'll need a couple terminals as well, 538-08-50-0108 should do just fine. I would go ahead and buy a bunch of extra terminals as you're likely to screw up the first couple tries. If you're looking to daisy chain several with one cable (if you're making an 8 channel for instance) it would behoove you to get terminals that accept a larger gauge wire (538-08-50-0106)
Title: Re: S800 Support Thread
Post by: evolver on December 18, 2009, 02:44:07 PM
OK -- so I have one board stuffed, and the PSU board stuffed -- i have a new n00bish question.

Given the attached image, which numbered pins on the Transformer do I attach to the 2 ACs holes and the Ground hole on the PSU board?

( This is the first time i have had to wire a power supply -- to date i have only put together SCA pres and put them in a case+PSU i bought from another guy. )



thanks for your help!

(ps -  i had an error trying to post this the first time, hopefully a duplicate doesnt pop onto the thread)
Title: Re: S800 Support Thread
Post by: peterc on December 18, 2009, 04:24:22 PM
Give us a clue, what are the transformer connections?

Also check this page:

http://1176neve.tripod.com/id26.html
Title: Re: S800 Support Thread
Post by: evolver on December 19, 2009, 08:05:52 AM
Give us a clue, what are the transformer connections?

Also check this page:

http://1176neve.tripod.com/id26.html

can you give me a clue how to figure that out ? :) i tried reading up on input transformers but most of what i found was just discussions of what they do, or different types. there are 8 pins on it, on one side numbered     3421   and on the other side   7865    I looked in the document sheet but didnt see anything as obvious as "pin 1 is hot, pin 2 is cold" (which is what i basically need).
Title: Re: S800 Support Thread
Post by: Harpo on December 19, 2009, 09:40:45 AM
Give us a clue, what are the transformer connections?

Also check this page:

http://1176neve.tripod.com/id26.html

can you give me a clue how to figure that out ? :) i tried reading up on input transformers but most of what i found was just discussions of what they do, or different types. there are 8 pins on it, on one side numbered     3421   and on the other side   7865    I looked in the document sheet but didnt see anything as obvious as "pin 1 is hot, pin 2 is cold" (which is what i basically need).
Get the transformers datasheet (http://system.netsuite.com/core/media/media.nl?id=2802&c=ACCT126831&h=25896e66a82a000d7263&_xt=.pdf) from the link you already posted, if it really is mouser part: 553-FP30-400, else get it for YOUR transformer.
Depending on your location (please update your profile, this is an intercontinental forum and mains voltages differ),
- for 115VAC mains connect the transformer primaries in parallel by linking pin 1 with 3 and pin 2 with 4. These 2 junctions connect to your IEC inlet with fuse and mains switch in between.
- for 230VAC mains connect the transformer primaries in series by linking pin 2 with 3. Transformer pins 1 and 4 connect to your IEC inlet with fuse and mains switch in between.

The transformer secondaries pin 5 and 8 connect to the two holes labled 'AC' on your supply pcb. Link transformer secondaries pin 6 and 7 and take this junction to the pcb hole labled 'GND'.
good luck
Title: Re: S800 Support Thread
Post by: mitsos on December 19, 2009, 09:55:40 AM
haha! This time you beat me harpo!!

A small question for you...  on the datasheet, pin 5&7 are hot and 6&8 are cold. The way you are suggesting, the secondaries are in series and you are connecting the "center tap" to ground. What is the difference between this and connecting the two hot pins to each AC and the two cold pins to AC ground?
Title: Re: S800 Support Thread
Post by: Harpo on December 19, 2009, 12:20:16 PM
on the datasheet, pin 5&7 are hot and 6&8 are cold. The way you are suggesting, the secondaries are in series and you are connecting the "center tap" to ground. What is the difference between this and connecting the two hot pins to each AC and the two cold pins to AC ground?
Difference is a working psu. For this psu design you want a center tapped transformer. Imagine this a single winding secondary with in-phase and out-of-phase potential at its end terminals and a phase-neutral tap in the middle. For same behaviour you connect a dual secondary to substitute this imaginary center tapped transformer as described above.
The transformer following rectifier is in between both end terminals (no connection to the center tap), sorting the positive and negative halfcycles to the 2-anode-side and 2-kathode-side diode junctions for +/- ends. The rectifying diodes have to see a differing voltage potential to do so.
Title: Re: S800 Support Thread
Post by: mitsos on December 19, 2009, 06:06:40 PM
I guess it helps to check a schematic now and again before posting, eh?  :-[
Title: Re: S800 Support Thread
Post by: evolver on December 19, 2009, 06:11:09 PM

Depending on your location (please update your profile, this is an intercontinental forum and mains voltages differ),

updated -- sorry for the breach of etiquette. I am in NJ / USA.


thanks
Title: Re: S800 Support Thread
Post by: evilcat on January 08, 2010, 09:02:11 AM
Hi everyone !

I've nearly finished my 1st unit. Before plugging the TL071s, is there any test measerements to do ?
Thanks.
Title: Re: S800 Support Thread
Post by: RedNoise on January 08, 2010, 09:07:48 AM
check voltage accordingly to the DIP8 config!
Title: Re: S800 Support Thread
Post by: Tungstengruvsten on January 08, 2010, 01:35:27 PM
just got mine up and working and the LMF is off in it's frequencies(but starts at the right bottom frequency) ...and displays a weird waveform compared to the HMF - here's some AP curves....

HMF
(http://i2.photobucket.com/albums/y8/tungstengruvsten/th_S800HMFfullcutboost1Kand9K.gif) (http://s2.photobucket.com/albums/y8/tungstengruvsten/?action=view&current=S800HMFfullcutboost1Kand9K.gif)

LMF
(http://i2.photobucket.com/albums/y8/tungstengruvsten/th_S800LMFfullcutboost100Hzand1K2.gif) (http://s2.photobucket.com/albums/y8/tungstengruvsten/?action=view&current=S800LMFfullcutboost100Hzand1K2.gif)



It seems that the available boost and cut goes down as the frequency of the LMF goes up...anyone seen this before?  Is this normal for these? part of their sound?  because they sound frickin' awesome on guitars! 
Title: Re: S800 Support Thread
Post by: evilcat on January 08, 2010, 04:20:14 PM
check voltage accordingly to the DIP8 config!

Honestly, I don't understand what it means !!! Sorry but, I'm a newbie, that's my 1st built. What voltage should I measure for what pin ? Thanks.
Title: Re: S800 Support Thread
Post by: RedNoise on January 08, 2010, 04:33:28 PM
you can pm me to get my email , I'll explain it in french if ya want!
Title: Re: S800 Support Thread
Post by: Tungstengruvsten on January 10, 2010, 04:14:20 AM
sorry....didn't want this to get missed since it was on the other page?  Anyone notice this behaviour or know fer sure if it's just the way it is?

just got mine up and working and the LMF is off in it's frequencies(but starts at the right bottom frequency) ...and displays a weird waveform compared to the HMF - here's some AP curves....

HMF
(http://i2.photobucket.com/albums/y8/tungstengruvsten/th_S800HMFfullcutboost1Kand9K.gif) (http://s2.photobucket.com/albums/y8/tungstengruvsten/?action=view&current=S800HMFfullcutboost1Kand9K.gif)

LMF
(http://i2.photobucket.com/albums/y8/tungstengruvsten/th_S800LMFfullcutboost100Hzand1K2.gif) (http://s2.photobucket.com/albums/y8/tungstengruvsten/?action=view&current=S800LMFfullcutboost100Hzand1K2.gif)



It seems that the available boost and cut goes down as the frequency of the LMF goes up...anyone seen this before?  Is this normal for these? part of their sound?  because they sound frickin' awesome on guitars! 
Title: Re: S800 Support Thread
Post by: Tungstengruvsten on January 11, 2010, 10:44:19 AM
ahem...just checking before I put the lid on and call it a day!!!
Title: Re: S800 Support Thread
Post by: Tungstengruvsten on January 12, 2010, 10:17:37 AM
...and another bump just to see if anyone gives a sh*t...
Title: Re: S800 Support Thread
Post by: MikoKensington on January 12, 2010, 10:26:33 AM
Is that at full boost and cut?  I remember reading that these do wacky things when they're working heavily. 
Title: Re: S800 Support Thread
Post by: wolfgang on January 12, 2010, 10:36:07 AM
So you have this type of curve wenn the lid is closed?
And when its open everything is ok?


I had similar problems! the psb is to close to the lid and can short something. I isolated the lid with tape and everything was fine!!

regards,
Wolfgang


Title: Re: S800 Support Thread
Post by: Tungstengruvsten on January 12, 2010, 10:55:23 AM
This is at full boost and cut - the only thing changed is the frequency...as the frequency goes up the available boost and cut goes down...on the LMF only.  Very strange!

This is with lid-off - haven't closed it up yet to call it a day, but I've got the lid well protected from the PCB pins...
Title: Re: S800 Support Thread
Post by: benlindell on January 12, 2010, 12:48:14 PM
Updated: I mistakenly had this with 270degree scales, I fixed it up now. New link below
Hey guys. I designed a 4-channel Front panel.  here's the illustrator file: http://benlindell.com/diy/S800%20to%20Laser.ai (http://benlindell.com/diy/S800%20to%20Laser.ai)

Here's pictures of a cardboard prototype:
(http://twin-x.com/groupdiy/albums/userpics/IMG_0212.jpg)
(http://twin-x.com/groupdiy/albums/userpics/IMG_0217.jpg)
(http://twin-x.com/groupdiy/albums/userpics/IMG_0220.jpg)
Title: Re: S800 Support Thread
Post by: evilcat on January 15, 2010, 03:05:42 AM
Hi everyone !

I've finished soldering yesterday and when I'm powering up the unit, the led beginning to blink faster and faster after maybe 10 sec. What does it mean ?
Another question : should I send a signal (like a sin or white noise) for make some measures on the IC pins ?
Thanks for helping.

Ben.
Title: Re: S800 Support Thread
Post by: 3nity on January 15, 2010, 01:05:01 PM
that means that its gonna explode once the LED stays on!  ;D
The led works if the eq is in bypass....maybe a contact..
Title: Re: S800 Support Thread
Post by: evilcat on January 15, 2010, 03:32:24 PM
that means that its gonna explode once the LED stays on!  ;D
The led works if the eq is in bypass....maybe a contact..

Ha ha ! Good one !
Now, seriously, the led works when EQ is bypass ?!!! I thought that it was when the EQ is "on"...
And what about the measures on the IC's pins  ?
Title: Re: S800 Support Thread
Post by: RedNoise on January 15, 2010, 04:50:17 PM
regarding DIP8 voltages , just check accordingly to datasheet(you'd better pull them out before checking)
Peace.
Title: Re: S800 Support Thread
Post by: RedNoise on January 15, 2010, 04:53:20 PM
the led beginning to blink faster and faster after maybe 10 sec.

faster and faster or more and more ?? "she" should not blink ...desolder led and check linearity of voltage...something looks like wrong with voltage here!
Title: Re: S800 Support Thread
Post by: evilcat on January 16, 2010, 07:58:48 AM
The LED isn't blinking when the ICs are unplugged and the voltages are OK. But when I re-plugged the ICs, the LED starts blinking again !

Help !!!
Title: Re: S800 Support Thread
Post by: peterc on January 16, 2010, 08:06:32 AM
Check all component values & use a magnifying glass to check for shorts.

Check your PSU to make sure the voltages are right. Measure the voltages on the ICs to make sure that the power rails are correct.

This is an unusual fault so I am sure it is one of the above.
Title: Re: S800 Support Thread
Post by: evilcat on January 16, 2010, 03:16:28 PM
All the caps values are OK, as the power rails. I just have a doubt for C24, C26 and Cpsua and Cpsub who needs to be 100nF : they are marked .1J63 (see the picture). Does it means that they are 100mF ?!!! I've put them 'cause I bought the Collin's kit and they were they only caps left so the only place where they could be soldered were for the 100nF caps (I don't know if I'm clear, sorry for my english  :-\ !).

Peter, what do you mean by "using a magnifying glass to check for shorts". I don't understand !

Thanks

(http://)

Title: Re: S800 Support Thread
Post by: evilcat on January 16, 2010, 03:27:50 PM
Ok, so I've checked "magnifying glass" on wikipedia and now I understand  :D ! Thanks Peter, I've learned a new english word !!!
Title: Re: S800 Support Thread
Post by: RedNoise on January 16, 2010, 03:53:24 PM
Hey le chat!
Have you checked (and rechecked) your 3PDT Wiring?
Title: Re: S800 Support Thread
Post by: evilcat on January 16, 2010, 04:06:53 PM
Yes Thibault, I have and the wiring is ok.
There is not orientation issue, isn't it ? I mean, top and bottom...
Title: Re: S800 Support Thread
Post by: RedNoise on January 16, 2010, 04:13:45 PM
hoping it's a on/on 3pdt , check with this schemo:(see attached Matta's file)
Title: Re: S800 Support Thread
Post by: RedNoise on January 16, 2010, 04:16:22 PM
try step by step adding AOP one by one , swap them if necessary...
The strange thing is that you told me your eq was perfectly working but the led , right?did you check with another led ?
Title: Re: S800 Support Thread
Post by: evilcat on January 16, 2010, 04:20:52 PM
I don't know yet if the EQ is working ! Voltages are ok, wiring is ok, caps values and orientation are ok (except the doubt I have for the 100nF caps).
3PDT is "on/on", and I've already checked with this schemo.
I will try step by step adding and swapping AOP.
Thanks for your help.
Title: Re: S800 Support Thread
Post by: Slenderchap on January 17, 2010, 06:51:16 AM
The 100nF capacitors say 0.1J on them.

0.1J = 0.1 microfarad, "J" means 5% tolerance

Colin
www.audiomaintenance.com
Title: Re: S800 Support Thread
Post by: evilcat on January 17, 2010, 07:27:23 AM
OK, so it's not the problem, thanks Colin. I'll test spet by step the ICs this afternoon.

Ben
Title: Re: S800 Support Thread
Post by: evilcat on January 17, 2010, 09:21:19 AM
The ICs become very hot after 10/15 sec : is it normal ?
Title: Re: S800 Support Thread
Post by: RedNoise on January 17, 2010, 09:22:18 AM
nope!
did you check every pins of the dip8?
Title: Re: S800 Support Thread
Post by: evilcat on January 17, 2010, 03:49:15 PM
Ok guys, first of all : IT WORKS  ;D !

I powered up, checked again the voltages, values, orientation, wiring, everything was find but the ICs became too hot to be touch after 15 sec and the LED started blinking again ! So I unplugged the ICs and started putting them one by one, waiting for each one to see if it becomes hot and after one or two swapping, it worked ! No ICs too hot anymore, no blinking LED, and a working unit.

And I discovered something weird at the very end, when everything worked : one of the IC is different. I've got 5 TL071 (plugged in U1 to 5) and 1 NE5322 (plugged in U6). So, maybe very dumb question : Is it normal ? I always thought that this unit works only with TL071 because this thread talks only about them but, was I missed something ? If yes, then I'm stupid and I only plugged ICs to the wrong places. If not, then it's weird, isn't it ?  ???

Thanks to everyone for having helped me.

Ben.
Title: Re: S800 Support Thread
Post by: evilcat on January 17, 2010, 03:54:58 PM
Ok, ok, so I'm a VERY STUPID PERSON !
U6 = NE5322

SHAME ON ME !!! Sorry, I won't do it again Father.   :-\
Title: Re: S800 Support Thread
Post by: peterc on January 18, 2010, 02:14:48 AM
Well done for finding the fault!

First step in a looong & winding road.... ;)

Peter
Title: Re: S800 Support Thread
Post by: evilcat on January 18, 2010, 04:07:08 AM
Thanks Peter for the kind word. I hope I will do a loooong DIY road ! Next step, finish my EZ 1290 and put it in the same box in order to make a small "channel strip" ! I'll post pictures.

Ben
Title: Re: S800 Support Thread
Post by: RedNoise on January 18, 2010, 06:56:44 AM
hi Ben glad you get this working : thumb up !
Title: Re: S800 Support Thread
Post by: pietro_moog on January 18, 2010, 12:51:06 PM
hi guys!
i know the s800 is modeled after the Trident s80 eq. is it the same circuit of the original?
i hear that Trident A range is a top class console, while the s80 was a good console.
is there so much of a difference? do they sound the same?
is this eq good for tracking?
how does it sound?

thanks
Title: Re: S800 Support Thread
Post by: peterc on January 18, 2010, 03:39:10 PM
The A range is completely different, using transformers, transistors & coils as opposed to IC's for the S800

Peter
Title: Re: S800 Support Thread
Post by: pietro_moog on January 19, 2010, 11:33:48 AM
thanks Peter!

do you  guys think that's a good sounding eq for tracking?
i know i'm breaking balls, but 


"can someone upload 2 files,like origianal and eq'ed?"
that would be so AWESOME!
i know it's a cheap project, but i must seriously watch my finances.
thanks
Title: Re: S800 Support Thread
Post by: benlindell on January 27, 2010, 04:18:37 PM
just got mine up and working and the LMF is off in it's frequencies(but starts at the right bottom frequency) ...and displays a weird waveform compared to the HMF - here's some AP curves....

HMF
(http://i2.photobucket.com/albums/y8/tungstengruvsten/th_S800HMFfullcutboost1Kand9K.gif) (http://s2.photobucket.com/albums/y8/tungstengruvsten/?action=view&current=S800HMFfullcutboost1Kand9K.gif)

LMF
(http://i2.photobucket.com/albums/y8/tungstengruvsten/th_S800LMFfullcutboost100Hzand1K2.gif) (http://s2.photobucket.com/albums/y8/tungstengruvsten/?action=view&current=S800LMFfullcutboost100Hzand1K2.gif)



It seems that the available boost and cut goes down as the frequency of the LMF goes up...anyone seen this before?  Is this normal for these? part of their sound?  because they sound frickin' awesome on guitars!  

Hey man, I just had a chance to sweep one of my channels and I got the same exact results as you did.
(http://blog.benlindell.com/wp-content/uploads/2010/01/LMF-150x150.jpg) (http://blog.benlindell.com/wp-content/uploads/2010/01/LMF.jpg)
(http://blog.benlindell.com/wp-content/uploads/2010/01/HMF-150x150.jpg) (http://blog.benlindell.com/wp-content/uploads/2010/01/HMF.jpg)

I did some more sweeps and posted here: http://blog.benlindell.com/?p=75

Is it weird that the highpass filter works regardless of bypass?
Title: Re: S800 Support Thread
Post by: Tungstengruvsten on January 27, 2010, 04:25:57 PM
that's good news...I think.  Would love to have someone who designed/knows what a 80b spits out to comment...
Title: Re: S800 Support Thread
Post by: pedroplanet on January 27, 2010, 04:55:41 PM
Quote

do you  guys think that's a good sounding eq for tracking?
i know i'm breaking balls, but 


It works well on drums.
Yesterday I tried to record guitars on it and couldn't get anything satisfactory.

I'd say it's a good but not great eq.
Title: Re: S800 Support Thread
Post by: rascalseven on January 27, 2010, 08:25:05 PM

Is it weird that the highpass filter works regardless of bypass?


Yes, that's weird.  The HPF on all of mine (10-channels) works perfectly.

I designed the S800 project (and by 'designed' I mean stole it directly from the Series 80 channelstrip drawings), because it is a revered eq that requires no esoteric parts (other than, perhaps, the dual-gang 100k reverse log pots).  Low parts cost and great performance makes this a great project.  I used to have some Trident EQ's and missed them badly after selling them, so I wanted to build some.

They are not the slickest EQ's around (GML ain't worried), but there is something unique and magical about them.  Quite honestly, if I were to build them again, I'd load half with 10k pots with a couple of resistors to reduce the total amount of available cut and boost, as it doesn't take much to get where you want to go with these.  Pretty heavy-handed stuff, but I love them on drums!  Also enjoy them (used gently) on electric guitars.  It's pretty raw stuff, but a nice, aggressively musical character that's cool on rock stuff.  It's one of those designs with a 'sound'... some love it, others won't.

As for the design itself, the only place I wandered from the original was in adding the balanced output.  On the console channelstrip the HPF is followed by a polarity inverting stage and then a pair of transistors feeding an unbalanced direct out.  I didn't care for the inverting stage and wanted a balanced out, so I added it, and that was that.

FWIW the 22u/16v caps are, I believe, tantalums in the consoles.  Colin's kits used electros, IIRC, which is cool, but a little less color as a result.  Mine have electros.  I may swap for the tants at some point, but have too many other things to do first.

JC
Title: Re: S800 Support Thread
Post by: RedNoise on January 29, 2010, 01:25:31 AM
Hi ,
BenLindell , did you use Omeg pots from Collin?Aren't they 300°??Your FP looks like you designed 270° scale for pots,is there a reason?If yes : why?
Thanks.
Title: Re: S800 Support Thread
Post by: benlindell on January 29, 2010, 01:44:50 AM
Yes I did, and yes it was. I have updated it since, I just started it with 270 and did find that till I tested it out. I just updated my front panel post
Title: Re: S800 Support Thread
Post by: RedNoise on January 29, 2010, 01:57:33 AM
thanks Ben !
Title: Re: S800 Support Thread
Post by: benlindell on January 29, 2010, 11:32:25 AM
Sorry guys, one last front panel update. I changed up some of the numbers on the scale. Some of them were not close to what frequency was being worked at all.

Updated link: http://benlindell.com/diy/S800%20to%20Laser2.ai (http://benlindell.com/diy/S800%20to%20Laser2.ai)
Picture:(http://benlindell.com/diy/S800-to-Laser2.jpg)
Title: Re: S800 Support Thread
Post by: evilcat on January 29, 2010, 05:50:40 PM
I designed the S800 project ('designed' is really too grandiose a term, I stole it directly from the Series 80 channelstrip drawings), because it is a revered eq that requires no esoteric parts (other than, perhaps, the dual-gang 100k reverse log pots).  Low parts cost and great performance makes this a great project.  I used to have some Trident EQ's and missed them badly after selling them, so I wanted to build some.

JC


I was thinking of asking this question some time ago : who brought this project to this forum ? So it's you Rascal7 and Peterc "only" makes the PCBs, is that right ? I'm asking this because I want to put the name of the "designer" on my case.

Ben A
Title: Re: S800 Support Thread
Post by: benlindell on March 08, 2010, 06:22:40 PM
Hey guys, finished up my first of two 4-Channel units this afternoon, love this thing, been running music through it and am really digging it.

More pics here: http://blog.benlindell.com/?p=222

Title: Re: S800 Support Thread
Post by: Hammond on March 26, 2010, 06:04:05 PM
Hi Guys

Just finished 2 of 4 channels.It Sounds great!
But i i' ve noticed that if i set the unity gain with the eq bypassed, for example;
i send a 1k tone at -6db to the eq and i get -6db at the output on both channels.
but if put the eq in, at the output i get -6.5 on left ch and -6.3 on the right ch.

Please can someone explain this behavior :-\
Title: Re: S800 Support Thread
Post by: Hammond on March 30, 2010, 04:44:15 PM
No one has that little ( 0.3-0.5 ) db difference between bypass and on? :-\
Title: Re: S800 Support Thread
Post by: benlindell on March 31, 2010, 12:07:30 AM
That difference is most likely from the pots, even in the middle they could be upto 10-20% off spec, so that's not unusual.
Title: Re: S800 Support Thread
Post by: Hammond on March 31, 2010, 09:45:47 AM
So the best thing to do is set it up for unity gain when the eq is engaged.

Thanks Ben  ;)

Title: Re: S800 Support Thread
Post by: hansherman on April 04, 2010, 12:48:58 PM
hey

everyone here says use "on on" 3pdt switches for the bypass. is it ok to use "on off on" instead?

cheers

s
Title: Re: S800 Support Thread
Post by: peterc on April 04, 2010, 02:05:29 PM
Sure. There will probably be no signal in the middle position though......
Title: Re: S800 Support Thread
Post by: benlindell on May 26, 2010, 11:44:16 PM
So I'm finishing up my second set of 4 and I want to see if anyone has some ideas about how to increase the headroom on these. The eq works great on guitars and quiet sources, but big loud drums and bass I'm getting an awful lot of distortion.

Anyone have some ideas?
Title: Re: S800 Support Thread
Post by: evilcat on May 27, 2010, 08:13:04 AM
I read somewhere in this thread that the voltages changed the headroom. +/-15V is the "normal" voltage operation but you can go to +/-18V without danger. Hope it'll help !

Ben A.
Title: Re: S800 Support Thread
Post by: peterc on May 27, 2010, 09:15:05 AM
Ben

Can you not drop the level going into the EQ's & gain up later?

I used a 1:1 gain staging set-up, so I am not too sure why there is overload.

Peter
Title: Re: S800 Support Thread
Post by: rrs on May 31, 2010, 05:51:05 PM
Hi

Just awaiting my boards so in the meantime designing a front panel to be done at Front Panel Express .Looking at Ben Lindell's design the 6 pot's are evenly spaced at 24cm.
Is this correct?
Title: Re: S800 Support Thread
Post by: helterbelter on June 30, 2010, 07:08:40 AM
I've downloaded the schematic from the Gmail account, but I can't open it. Probably zipped with a Mac. Can somebody mail it to me as JPEG, PDF, or such ?

my email is paulbeltman {at} yahoo {dot} com

Thanks in advance.  :)
Title: Re: S800 Support Thread
Post by: nickeveslage on June 30, 2010, 09:28:44 AM
Paul

E-mail sent. I didn't have any trouble unzipping on a PC. Anyway, I sent you a PDF since I've only got a reader and can't edit or save in other formats.

Enjoy!
Title: Re: S800 Support Thread
Post by: helterbelter on June 30, 2010, 11:33:11 AM
Thank you's to both Nickeveslage and Rednoise !

 :D
Title: Re: S800 Support Thread
Post by: penguin on July 06, 2010, 01:44:50 PM
i wanna add a switch, so i can cut sharper on HPF when i needed to... which component (s) i need to mess about ?
Title: Re: S800 Support Thread
Post by: rrs on July 08, 2010, 08:18:57 AM
Hi Guys
I am using Peter C's PSU at 18V (or 17.7V+/- to be exact). I have a 4 Chanel unit using the TL071''s and have noticed some here are having success with OPA134's and 602's.
Well with me being a "ME TOO" type person I would be interested in doing this but am worried if the increase in current draw will be too much for Peter C's Green PSU V6.

I don't want to shell out for 4 channels of Burr Browns to find I will also need to upgrade the PSU.
Title: Re: S800 Support Thread
Post by: jordan s on July 19, 2010, 02:49:20 AM
Does anyone know where I can get some PCB's? I emailed Peter C a few weeks ago but he doesn't seem to be responding any time soon.
Title: Re: S800 Support Thread
Post by: RedNoise on July 19, 2010, 02:53:44 AM
IIRC PeterC or blackmarket is your only chance to get them...be patient! ;)
Title: Re: S800 Support Thread
Post by: slowbass on July 19, 2010, 05:14:10 AM
Tat Purusha sells the PCBS along with his case...
Title: Re: S800 Support Thread
Post by: flintan on July 30, 2010, 12:09:44 PM
Finished a dual s800 eq today. I ended up building it upside down with everything mounted to the top of the case because of the reversed layout of pots/freq. Seemed like the easiest solution. Will track some drums next week with it on the ribbon overheads.

(http://forumbilder.se/thumbs/790201060628Pc416.jpg) (http://forumbilder.se/show.aspx?iid=790201060628Pc416)

(http://forumbilder.se/thumbs/2d0201060805P9f9f.jpg) (http://forumbilder.se/show.aspx?iid=2d0201060805P9f9f)
Title: Re: S800 Support Thread
Post by: 3nity on July 31, 2010, 01:43:00 PM
Congrats Flint.
Looking really good!
looking forward to complete mines..
Cheers.
Title: Re: S800 Support Thread
Post by: stereokillah on August 11, 2010, 06:18:27 PM
hi there,
i've one of my board that do a strange song like sound generator  when i put the frequency around 100hz on LMF
someone could help me please.

i checked all capacitors etc..

all seems good.

thanks.
Title: Re: S800 Support Thread
Post by: benlindell on August 11, 2010, 09:01:16 PM
I remember having something like that happen on one of mine and I think it was that I forgot to solder one leg of one of the pots. Double check everything is soldered well.
Title: Re: S800 Support Thread
Post by: stereokillah on August 12, 2010, 08:30:53 PM
Thank you Sir, it was the good direction, a bad connection between the wire and board for the potentiometer.
Title: Re: S800 Support Thread
Post by: kpearsall on August 12, 2010, 08:52:20 PM
will this psu kit work with the design?

http://www.paia.com/proddetail.asp?prod=9770U

Title: Re: S800 Support Thread
Post by: peterc on August 13, 2010, 01:59:20 AM
Rather go with this one:

http://www.paia.com/proddetail.asp?prod=9770R-15

Running on +-15v rather than +-18v will make very little difference to the sound(if any) & this PSU is regulated, while the U version is unregulated.

Peter

will this psu kit work with the design?

http://www.paia.com/proddetail.asp?prod=9770U


Title: Re: S800 Support Thread
Post by: kpearsall on August 13, 2010, 03:40:20 PM
I'll give that a shot then... I've got an 80c here in the studio which is running at 18 just thought that would be nominal for headroom purposes. I'll test them against each other when I'm finished.
Title: Re: S800 Support Thread
Post by: benlindell on August 14, 2010, 12:29:05 AM
I tested a set of mine with both 15V and 18V and they sounded and measured the same at both voltages.
Title: Re: S800 Support Thread
Post by: Siegfried Meier on August 20, 2010, 09:20:19 PM
Hey guys,

Loving my 8 channel unit that I built a few years  back, and am considering building a 32 channel version for a little custom console idea I've been thinking about for a while.

In doing some tests today, I was noticing the hiss that is brought out when you boost the top end etc., general eqing stuff that happens with all analog eq's.  In working with plugs for so long, it's easy to forget that this was a basic fact of boosting.  I'm worried now that building 32 of these would inject significant noise into the mix, so I'm wondering if there's anything that can be done to reduce the amount of hiss, or if it's simply inherent in this circuit and a fact of the design.

Any thoughts appreciated.

Thanks!
Sig
Title: Re: S800 Support Thread
Post by: pedroplanet on August 20, 2010, 10:07:51 PM
nice question, I could never boost the high shelf as much as I wanted due to the hiss,
but never tought about it...
Title: Re: S800 Support Thread
Post by: 3nity on August 20, 2010, 10:38:17 PM
The hiss is the first thing i noticed last night when tested my 2 S800 channels.
It would be interesting if someone has an idea on how to fix that.
Thanks.
Title: Re: S800 Support Thread
Post by: JoeMorris on August 21, 2010, 08:59:06 AM
Is it possible to get PCBs for these anywhere? I really want to build a pair.
Title: Re: S800 Support Thread
Post by: evilcat on August 23, 2010, 06:39:42 AM
Ask to Peter C if is still have boards. He's the one who make them for us. See in the Black Market.
Title: Re: S800 Support Thread
Post by: Siegfried Meier on August 25, 2010, 10:07:27 PM
Is everyone getting the hiss thing?  Dead quiet when the unit is engaged, but all controls are flat.  I imagine it's pretty normal and just inherent in the chips used in that circuit.

By comparison though, my Focusrite Red 3 is dead quiet with ALL frequency bands cranked.  I only got a tiny bit of hum, which I don't get in my S800's. 

Again, likely just the circuit and parts used?

Curious to know.
Thanks,
Sig

Title: Re: S800 Support Thread
Post by: Fortran on September 05, 2010, 10:57:13 PM
Can anybody suggest which XLR's M/F are suitable for this build ? Im looking at the Neutrik D-series. Would the following be ok ?


Female: NC3FD-V-BAG
Male:  NC3MD-V-BAG

http://www.neutrik.com/uk/en/audio/204_269621/D_Series_productlist.aspx
Title: Re: S800 Support Thread
Post by: pacemaker on September 14, 2010, 06:11:46 AM
hi guys,
i've finished my 2nd stereo S800,
i love these eq's but would like to enlarge the Q,
I know it can be done with modifying some resistance ,
or installing trimpots or better pots,
being a noob in electronic theory,
i can't find by myself wich resistance to change,
would somebody having the knowledge accept to answer me ?
Hope somebody will help me,
Best regards,
Francois
Title: Re: S800 Support Thread
Post by: pacemaker on September 15, 2010, 03:57:41 AM
Hi guys,
i tried to study harder,
i'm guessing that for HF ,
changing the Q could be done by replacing R9 by a trimpot
FOR LF ,it might be R12
HMF R14 and LMF R16
Please can anybody help me for this ?
best regards,
Francois
Title: Re: S800 Support Thread
Post by: pacemaker on September 28, 2010, 04:31:05 AM
Still nobody ?
please EQ guru's help us,
i think a lot of people would like to put trimpot or pots
to change the Q on this wonderfull EQ,
best regards,
francois
Title: Re: S800 Support Thread
Post by: audiophreak on October 08, 2010, 10:16:15 AM
Hi All,
       Only got to page 18 so far, but haven't seen the info I'm looking for yet, so here goes ...   ;D

  In this pic, is what I have labeled  A = Link/jumper/ zero Ohm R
                                                 B = 47kR
                                                 C  = 47kR

  ... Also, are all the Lk / LK1 / LK1LK / LK2 / LK2LK / LK3LK  - are they all Link/jumper / zero Ohm R ?

  sorry if I've missed it or haven't read it yet

  many thanks as always  :)
Title: Re: S800 Support Thread
Post by: benlindell on October 08, 2010, 10:20:07 AM
Yes to all. I remember that part of the board was really confusing. All of those lk parts are jumpers
Title: Re: S800 Support Thread
Post by: audiophreak on October 08, 2010, 10:37:59 AM
Thanks !    :)
Title: Re: S800 Support Thread
Post by: peterc on October 08, 2010, 02:51:00 PM
LK = link
Title: Re: S800 Support Thread
Post by: pacemaker on October 08, 2010, 05:23:48 PM
couls somebody come and shine with a way to change the Q
on this wonderfull EQ ?
Title: Re: S800 Support Thread
Post by: audiophreak on November 07, 2010, 05:02:42 PM
Hi All,
        Will be putting four of these in a 2U rack case, was wondering about PSU.... I have the one that came with Collins kits, ( the Green Pre PSU )  but also have a couple SSL9k PSU PCBs left over,  is one better suited for this than the other ?

  Also would like to know about different OpAmp options...  ;D

  any info would be great, Thanks
Title: Re: S800 Support Thread
Post by: audiophreak on November 26, 2010, 03:25:23 PM
O.K.   --  I'm going to used the the Green Pre PSU , and would like to know if I can use a W04 bridge rectifier instead of the big square one

  Thanks,
            Chip
Title: Re: S800 Support Thread
Post by: peterc on November 26, 2010, 03:45:32 PM
Chip

W04 should be fine.

Peter
Title: Re: S800 Support Thread
Post by: audiophreak on November 26, 2010, 04:03:13 PM
Thanks Peter !

   should be ready to flip the switch in a couple of days, waiting on some parts, ...  and Thanks for building and making this project available.

    Chip
Title: Re: S800 Support Thread
Post by: audiophreak on November 30, 2010, 11:00:07 PM
Hi All,
       Just re-read this thread , but didn't see the problem I'm having. Just fired up a quad of these in a 2U case, three work fine, one the LF and HF dont work, audio passes fine and LMF and HMF work fine, bypass works too.

  Any Idea's ?

   with the PCBs upside down makes it very difficult to test, was thinking of swapping out ICs with a working channel, if not the problem will have to remove and run leads from PSU to test   >:(

  any suggestions greatly appreciated.

   Thanks  !
Title: Re: S800 Support Thread
Post by: peterc on December 01, 2010, 01:19:17 AM
Check all your soldering & component values (I'm sure you have already). The fact that 2 bands work & 2 dont point to an error there in.

Check pot wiring as well.

Peter
Title: Re: S800 Support Thread
Post by: audiophreak on December 01, 2010, 08:58:25 AM
Thanks Peter  :)
Title: Re: S800 Support Thread
Post by: audiophreak on December 01, 2010, 11:54:23 AM
.. well... I swapped in  ICs from a working channel and its all good now !  :D

  so gotta place an order for for some TL071s, I think I have a couple 5532s left over from  GSSL builds - will post some pics soon.
 
Title: Re: S800 Support Thread
Post by: audiophreak on December 08, 2010, 10:17:14 AM
Hi All,
        Got the new ICs in and all is well  :D

      I've been doing some testing with a frequency analyzer and found some things a little odd.
 Running Pink Noise through it I found the that the Low frequency seems to be centered around 80Hz with toggle on the lower frequency position, when toggle in higher frequency position, frequency doesn't seem to change, what does seem to change is the Q or bell curve gets wider but still centered around 80Hz   ???

  Same thing with the High Frequency, seems to be centered around 10k with toggle in lower frequency position, when switch to higher frequency position the Q gets wider, but still centered around 10k  ???

  I hope I havent wired something wrong or placed wrong components, I used Collins Kits, and it all sound s good.

  Any Thoughts ?   Anyone ? 

  Pix to follow soon  :)
Title: Re: S800 Support Thread
Post by: audiophreak on December 09, 2010, 08:37:58 PM
I apologies if this has been covered or if this is too much of a Newbee question, but would like to know if this is the way this EQ works, or did I mess up the build ?
Title: Re: S800 Support Thread
Post by: benlindell on December 09, 2010, 11:31:44 PM
I apologies if this has been covered or if this is too much of a Newbee question, but would like to know if this is the way this EQ works, or did I mess up the build ?

No question is too newb. Sometimes pink noise with a spectrum analyzer can be tough to see smoothly and clearly. Check out the sweeps I made of my unit:
http://blog.benlindell.com/?p=75

You may want to try out something like RMAA or fuzzmeasure as well.
Title: Re: S800 Support Thread
Post by: audiophreak on December 10, 2010, 09:36:18 AM
Thanks Ben !
    .. so I guess I need to invest in proper testing gear   ;D   from your description my method doesn't  seem to have a fine enough  " resolution "  .
    after posting last night, i remembered your blog - ( awesome information , and I used your pannel layout too ) I think everything sounds like your sweeps in my unit, but the LF doesnt " sound " like your LF sweeps, - will need to figue out better testing methods.
  Thanks again,
                       Chip
Title: Re: S800 Support Thread
Post by: audiophreak on December 20, 2010, 07:57:06 PM
Hi All,
       Setting for unity gain ( Duh )   ::)  seams to have fixed what I was hearing and the units sound great !  :)

  Thanks to Peterc , benlindell  - ( used your panel graphic ) , and All who posted, and to this Great Forum Community.

here are some pix - https://goo.gl/photos/5K71Xuvt7iaKfbWD9
Title: Re: S800 Support Thread
Post by: evilcat on December 21, 2010, 04:30:16 AM
Nice and clean built, congrats !
Title: Re: S800 Support Thread
Post by: 3nity on December 21, 2010, 09:43:11 AM
AudioPhreak...what knobs are those you used??
Thnaks,
Title: Re: S800 Support Thread
Post by: audiophreak on December 21, 2010, 10:04:01 AM
Hi 3nity,
           I got them from Selco - http://catalog.selcoproducts.com/viewitems/collet-knobs/basic-collet-knob?&pagenum=2&measuresortid=0

  Knobs - P/N - S151-250 Black   ,   Caps - P/N C151 White
Title: Re: S800 Support Thread
Post by: 3nity on December 21, 2010, 09:06:57 PM
nevermind...
Title: Re: S800 Support Thread
Post by: audiophreak on December 21, 2010, 10:44:42 PM
Thanks evilcat  !   :)
Title: Re: S800 Support Thread
Post by: pietro_moog on December 30, 2010, 02:37:55 PM
hi guys
i'm looking for 4 pcbs, do you know where i might get them?
Title: Re: S800 Support Thread
Post by: audiophreak on December 30, 2010, 03:16:13 PM
I think Peterc should still have them, or try the Black Market, I would also highly recommend Collins kits, (AML )  they have everything except PSU components.
Title: Re: S800 Support Thread
Post by: pietro_moog on December 30, 2010, 03:24:37 PM
cool. i thought they just have components kits. i'll mail them, thanks.
Title: Re: S800 Support Thread
Post by: audiophreak on December 30, 2010, 03:39:33 PM
  sorry.... AML does only have componat kits, I was just recommending them  ;D
Title: Re: S800 Support Thread
Post by: buschfsu on January 19, 2011, 07:53:39 PM
Guys where is a good spot to tie in and out for unbalanced connection keeping in mind i need the bypass to work.? Thanks
Title: Re: S800 Support Thread
Post by: beatnik on April 18, 2011, 05:57:45 AM
where to buy pcbs for this project? or, even better, a self etch file? i tried to search with no results
Title: Re: S800 Support Thread
Post by: JoeMorris on May 27, 2011, 07:03:59 AM
Do AML not do component kits for these any more? I quite fancied building some
Title: Re: S800 Support Thread
Post by: MasonAtom on August 25, 2011, 01:57:24 PM
Updated: I mistakenly had this with 270degree scales, I fixed it up now. New link below
Hey guys. I designed a 4-channel Front panel.  here's the illustrator file: http://benlindell.com/diy/S800%20to%20Laser.ai (http://benlindell.com/diy/S800%20to%20Laser.ai)

Here's pictures of a cardboard prototype:
(http://twin-x.com/groupdiy/albums/userpics/IMG_0212.jpg)
(http://twin-x.com/groupdiy/albums/userpics/IMG_0217.jpg)
(http://twin-x.com/groupdiy/albums/userpics/IMG_0220.jpg)

Hey Ben, I was reading through this thread and you mentioned that you saw some weirdness in the frequency sweeps? Looking at your pictures closely, I think you have a "link (0 ohm) resistor where R41 should be, and a 47k resistor where the link should be. I haven't checked this against the schematic, so this might have nothing to do with the bands that you're having issues with, but I thought I'd point it out. Of course, I could also be horribly wrong.

Really great looking builds regardless.

Mason
Title: Re: S800 Support Thread
Post by: MasonAtom on August 25, 2011, 02:10:00 PM
Ben, looking over the schematic, the 47k resistor is right at the balanced output, doesn't appear to be related to the LMF at all.
Title: Re: S800 Support Thread
Post by: 3nity on August 25, 2011, 10:49:08 PM
Anyone here please.
I need to calibrate my pair of S800.
Do i need something special for calibration??
Thanks,
Title: Re: S800 Support Thread
Post by: evilcat on August 26, 2011, 05:05:30 AM
If I remember correctly, there's a trimmer for adjust unity gain, and that's all.
Title: Re: S800 Support Thread
Post by: baadc0de on September 18, 2011, 03:00:42 PM
(http://farm7.static.flickr.com/6206/6159393976_a3b861d8f3_z.jpg) (http://www.flickr.com/photos/[email protected]/6159393976/)

Finished four channels in purusha case. Just wanted to give you all a heads up on how they look like with Elma (I think?) knobs that I got off of electrochronic.

Cheers and thanks for an easy and good sounding project!
B.
Title: Re: S800 Support Thread
Post by: spase on September 22, 2011, 09:42:47 PM
anyone know where i can find this pcbs?Thank you
Title: Re: S800 Support Thread
Post by: evilcat on September 23, 2011, 03:19:33 AM
Try PeterC, he may have some left...
Title: Re: S800 Support Thread
Post by: spase on September 23, 2011, 06:10:07 AM
they are sold out...anyone can make another run from this pcbs????
Title: Re: S800 Support Thread
Post by: peterc on September 23, 2011, 07:27:09 AM
If there is enough interest, say more than 30 PCbs, I can do another run.

Regards
Peter
Title: Re: S800 Support Thread
Post by: kpearsall on September 23, 2011, 10:18:11 AM
I'm in for 8. what's the price per board?
Title: Re: S800 Support Thread
Post by: spase on September 23, 2011, 10:22:47 AM
give us a price for 8 boards
Title: Re: S800 Support Thread
Post by: spase on September 23, 2011, 10:42:19 AM
i will go for more if there will be a good price :)
Title: Re: S800 Support Thread
Post by: kpearsall on September 23, 2011, 11:11:05 AM
same here.
Title: Re: S800 Support Thread
Post by: peterc on September 23, 2011, 11:14:32 AM
I will have to check, but the boards will be US$14 - $18 each. Shipping will be $10 per 5 boards

Delivery is 3 weeks + 2-3 weeks shipping

Peter
Title: Re: S800 Support Thread
Post by: kpearsall on September 23, 2011, 12:21:29 PM
ok. Make my order for 10 boards please :)




EDIT: My friend would like to get in on this as well, so make my order for 20 boards!
Title: Re: S800 Support Thread
Post by: spase on September 24, 2011, 12:38:46 AM
im in for 10 just to know peter...did you have any other pcb projects at the moment in stock?
Title: Re: S800 Support Thread
Post by: spase on September 24, 2011, 01:07:43 AM
You can try to make a kit again...maybe someone will want with a kit include :)
Title: Re: S800 Support Thread
Post by: baadc0de on September 24, 2011, 03:26:16 AM
I have ordered a kit from colin for the s800 for my recent builds. No problems with stock or waiting.

The cases that we probably see the most (purusha s800-2 and s800-8) are not available anymore afaik.
Title: Re: S800 Support Thread
Post by: spase on September 24, 2011, 09:43:15 AM
how much are the kit for this eq?we can try to make another run for that cases :)
Title: Re: S800 Support Thread
Post by: baadc0de on September 24, 2011, 01:25:50 PM
http://www.audiomaintenance.com/acatalog/kits.html

Quote
AML-17-011 - S800 kit - mono channel

Details: Click on image for kit list / information
Part Code: AML-17-011 
(1+) £18.81 each (Ex.VAT)
(4+) £17.81 each (Ex.VAT)
(8+) £16.81 each (Ex.VAT)

What you don't get from him is:
- the power supply: trafo, PCB, components
- SPDT switches
- 3PDT switches
- PCB, case
- LED indicators

the rest, ofcourse not including the tools you need to do DIY with, is provided for (pots, capacitors, sockets, opamps, resistors, ..)
Title: Re: S800 Support Thread
Post by: spase on September 24, 2011, 03:19:55 PM
thanks for this great info :)) first to get those s800 pcbs from peter than we go for this :))
Title: Re: S800 Support Thread
Post by: spase on September 25, 2011, 11:14:11 AM
we can try to make another run from that purusha 8 channel casses
Title: Re: S800 Support Thread
Post by: baadc0de on September 25, 2011, 01:21:40 PM
we can try to make another run from that purusha 8 channel casses

Yes, I've asked him about it and he seems amenable. Cases could be deeper this time around, no? In any event I suggest the debate and possible ordering thread for cases should move to his forum www.diy-racked.com/diy-talk (http://www.diy-racked.com/diy-talk)
Title: Re: S800 Support Thread
Post by: peterc on September 28, 2011, 02:33:57 AM
I have ordered a batch of 70 PCBs.

Price is US$15 each, PSU boards are $6, shipping is $10 per 5 boards

Peter
Title: Re: S800 Support Thread
Post by: kpearsall on September 28, 2011, 09:39:41 AM
great! will 1 psu board supply enough current for 8 channels?
Title: Re: S800 Support Thread
Post by: peterc on September 28, 2011, 09:42:09 AM
1 PSU board will be fine if you use heatsinks on the regs or mount the regs on the case.

Peter
Title: Re: S800 Support Thread
Post by: Indecline on September 28, 2011, 10:55:50 AM
oh badass!! I'm defiantly in for 4 boards and 1 psu board. Where can i pay peterc?  ;D
Title: Re: S800 Support Thread
Post by: spase on September 28, 2011, 11:56:56 AM
tell us when we can pay for that boards.im in for 9 boards,and one psu.send me a pm or something
Title: Re: S800 Support Thread
Post by: peterc on September 28, 2011, 02:49:57 PM
Order list:

kpearsall    20 + 2PSU    Paid
Indecline     4 + 1PSU     Paid
Spase          9 + 2PSU    Paid
Tsane          8 + 2PSU    Paid
Coriolis        5                Paid
Jay Dubrek  6 + 1PSU    Paid
Rellister       2 + 1PSU    Paid
-------------------------
                  54 + 8PSU

BOM is here:
http://twin-x.com/groupdiy/displayimage.php?album=lastup&cat=10096&pos=0 (http://twin-x.com/groupdiy/displayimage.php?album=lastup&cat=10096&pos=0)

Peter
Title: Re: S800 Support Thread
Post by: kpearsall on September 28, 2011, 05:49:56 PM
I'm in for 20 boards and 2 PSU boards... I had edited my original 10 board post, sorry. So 20 boards and 2 PSU boards. Thanks PeterC. Let me know how and when I can pay.
Title: Re: S800 Support Thread
Post by: Tsane on September 29, 2011, 05:40:44 AM
I'd like 8 boards and 2 psu boards. Thanks!
Title: Re: S800 Support Thread
Post by: Indecline on September 29, 2011, 11:23:01 AM
thanks! payment sent!
Title: Re: S800 Support Thread
Post by: kpearsall on September 30, 2011, 12:02:52 PM
Payment sent. Thanks again for doing this Peter.
Title: Re: S800 Support Thread
Post by: spase on October 05, 2011, 01:15:50 PM
payment sent peter 167$ for 9 pcbs 2 power supply boards and shipping :)
Title: Re: S800 Support Thread
Post by: coriolis on October 06, 2011, 08:09:17 AM
Hi peterc - pm sent for odering details!

Best

C
Title: Re: S800 Support Thread
Post by: coriolis on October 06, 2011, 10:56:58 AM
Boards paid! Must be fun knowing people all over the world are building your projects!

C
Title: Re: S800 Support Thread
Post by: spase on October 06, 2011, 01:06:15 PM
we gonna need a good case for this 8 channel eq.Anyone have an idea for a case or something?we can buy from purusha but we need to be like 3-4 to get another round.
Title: Re: S800 Support Thread
Post by: spase on October 06, 2011, 01:14:34 PM
or maybe a 2 - 4 channel cases :))
Title: Re: S800 Support Thread
Post by: kpearsall on October 06, 2011, 01:21:22 PM
I was gonna make a front panel in Front Panel Designer for mine. I really don't like the blue cases for them. and I'd like to use as many pushbuttons as possible. I'm gonna base mine off the 80c I have here at work.
Title: Re: S800 Support Thread
Post by: spase on October 06, 2011, 01:35:57 PM
you can share with us if you like...i will take that panel if you make it look good :))
Title: Re: S800 Support Thread
Post by: kpearsall on October 06, 2011, 02:26:36 PM
Will let you know... I still need to get the measurements for drilling. Hoping to have the layout done this weekend but I have some session work as well.
Title: Re: S800 Support Thread
Post by: JayDubrek on October 06, 2011, 05:56:50 PM
Am I too late to get in on this? Need 6 pcbs + 1 psu pcb...
Cheers
Jay
Title: Re: S800 Support Thread
Post by: MasonAtom on October 12, 2011, 04:20:48 PM
Wow... after sitting on this project for 3 years, I finally assembled one channel last night and played around with it to EQ some DI bass and guitar (instrument --> NewYorkDave MILA --> S800 --> soundcard).

Couple comments/questions:

1) What fuse value is everyone using? I think I have a 1A fuse in currently.

2) Very nice, very versatile EQ, capable of subtle to not-so-subtle coloration. Really nice to dial in a bit of chimey harmonic distortion in the mid-range on DI guitar.

Everything worked great... but it seemed to me that the Low Frequency select switch (60 Hz / 120 Hz) acted more an on/off gain boost. I looked at the realtime FFT frequency response with a bass guitar signal and it didn't seem like there was any frequency dependence... just that everything below 200 Hz was boosted when set at 120 Hz, and slightly cut when set at 60 Hz. The relative peak to peak intensities in the 20 Hz to 200 Hz region stayed the same. (I had the low-mids set around 500 Hz when I did the testing so I don't think they were interfering.) Any thoughts on this?

The HPF works as advertised, with a clear decrease in the peak size < 50Hz.

Mason

I'll post some pictures once I make the panel.
Title: Re: S800 Support Thread
Post by: JayDubrek on October 19, 2011, 07:43:01 AM
Payment sent for 6x PCB + PSU PCB
Thanks Peter...

Jay
Title: Re: S800 Support Thread
Post by: peterc on October 19, 2011, 08:41:49 AM
Boards arrived today, will ship them this weekend.

Regards
peter
Title: Re: S800 Support Thread
Post by: Indecline on October 19, 2011, 11:14:49 PM
Boards arrived today, will ship them this weekend.

Regards
peter
awesome, just got parts in from audio maitence yesterday!
Title: Re: S800 Support Thread
Post by: coriolis on October 20, 2011, 07:12:06 AM
Hmm...been all the way through this thread, searched all of groupdiy, checked the gmail account, etc:
But can't find a schem for this! Can anyone point me to it or pm it to me?

Thanks in advance! I'm still debating whether I should order more boards - they seem like a cool piece of kit...

C
Title: Re: S800 Support Thread
Post by: JayDubrek on October 20, 2011, 03:35:15 PM
Anyone else gonna go for Purushas 8 space case? He's sayin he can do them in red or black also, depending on what the majority want...personally I just need an easy solution to metalwork on this..!
Title: Re: S800 Support Thread
Post by: CapRock on October 20, 2011, 11:03:35 PM
Hey Everyone,
     I Just finished 4 channels of these eq's and noticed something odd I wanted to ask about.  I set all of them up for unity gain with the trimpots.  For some reason I am getting a lot of distortion in all 4 channels but only when they are in bypass.  If I flip the switch and put them in circuit and leave all the knobs at center detent, everything sounds clean and there is almost no audible volume difference.  If I then flip back to bypass the sound remains clean for about ten seconds and then slowly starts to become distorted again.  All pots, switches are working as they should and so are led's.  here is my ground scheme in case it helps define the problem.  IEC input to chassis -> Chassis to PSU ground (AC input side) -> PSU ground (DC output side) to both PCB power supply input grounds.  XLR's are grounded to the chassis tab on each connector and I left the ground pads for the XLR's on the PCB empty.  If anyone has any insight as to what may be causing this please let me know, thanks in advance...



Cap
Title: Re: S800 Support Thread
Post by: peterc on October 21, 2011, 03:35:37 AM
@Caprock

If you have a look at this pic

(http://img.photobucket.com/albums/v318/peter_cornell2002/s80_input_circuit_p1.jpg)

you will see that 1 section of the bypass shorts out a resistor to ground, and if there is no ground to that pad, it might be that there is a 10sec discharge path that leads to the distortion.

Make sure that that leg of the switch is properly grounded.

Peter
Title: Re: S800 Support Thread
Post by: peterc on October 21, 2011, 03:52:05 AM
@coriolis

http://twin-x.com/groupdiy/displayimage.php?pid=4694&fullsize=1
Title: Re: S800 Support Thread
Post by: CapRock on October 21, 2011, 02:43:57 PM
Do I need to run the ground wire to the switch, in my case a 3pdt wired as Matta showed in his diagram, or do i need to run the ground wire to a specific solder pad where the bypass switch connects on the PCB?
Title: Re: S800 Support Thread
Post by: peterc on October 21, 2011, 03:32:40 PM
If you have ground attached to the PCB, then the switch pin should automatically be grounded.

Just check to see that this pin is actually grounded

Peter
Title: Re: S800 Support Thread
Post by: CapRock on October 21, 2011, 10:45:21 PM
Ok, it is grounded.  I think the issue I was having is that I was sending a signal close to digital "0" or +18db through the unit and i was distorting the input.  For some reason when I engage the circuit without any pots turned the problem goes away.  I found that around -9 DBf is where my signal begins distorting.  Anything around -18 dbf (0dbu) - -9 dbf is clean.  Does that sound about right for what the input of this circuit can handle?
Title: Re: S800 Support Thread
Post by: coriolis on October 23, 2011, 02:06:47 PM
@peterc:
Thanks for the schem - but I can barely read the component values. Got anything in better resolution?
Sorry to be a pain!

C
Title: Re: S800 Support Thread
Post by: Rellister on October 30, 2011, 11:50:14 AM
Peter,

Boards still available for this?
PM´d also.

Thanks
Title: Re: S800 Support Thread
Post by: peterc on October 31, 2011, 04:53:57 PM
Rellister

I have PCBs,  PM sent.

Regards
Peter
Title: Re: S800 Support Thread
Post by: JayDubrek on November 07, 2011, 09:09:28 AM
Hi Peter- just wondered when PCBs are being sent out?
Cheers
Jay
Title: Re: S800 Support Thread
Post by: peterc on November 07, 2011, 09:53:14 AM
Jay

PCBs were sent during last week. Shipping is 2-4 weeks, usually 2-3 weeks.

So they should be showing up from next week onwards.

Regards
Peter
Title: Re: S800 Support Thread
Post by: JayDubrek on November 07, 2011, 10:38:47 AM
That's great...thanks Peter!
Title: Re: S800 Support Thread
Post by: Rellister on December 08, 2011, 09:45:17 AM
peterc,

are my pcb´s in the mail?
Over 4 weeks, getting worried :-\



Title: Re: S800 Support Thread
Post by: JayDubrek on December 08, 2011, 10:47:07 AM
Yep-still no sign...everything okay with the PCBs Peter?
Thanks
Jay
Title: Re: S800 Support Thread
Post by: Tsane on December 08, 2011, 11:11:59 AM
I received mine yesterday (Belgium), so they're probably somewhere very close now ;)
Title: Re: S800 Support Thread
Post by: spase on December 08, 2011, 11:13:27 AM
still waitin here :(
Title: Re: S800 Support Thread
Post by: peterc on December 08, 2011, 11:20:29 AM
Hi al

Sorry for the delay, they should be there anytime soon.

A batch of boards arrived with  another client on Tuesday that was sent at the same time.

Peter
Title: Re: S800 Support Thread
Post by: Rellister on December 09, 2011, 04:38:16 AM
Thanks Peter, all good.

Which cases/panels do people have in mind who still haven´t built this?

 

Title: Re: S800 Support Thread
Post by: kpearsall on December 09, 2011, 11:46:14 AM
I'm still deciding on that too. Was making a design for an 8 channel, but I want it so exact it really has to wait until I have the actual cards ready to go so I can make measurements....
Title: Re: S800 Support Thread
Post by: JayDubrek on December 12, 2011, 05:31:55 AM
Boards arrived this morning....thanks Peter!

Jay
Title: Re: S800 Support Thread
Post by: Rellister on December 12, 2011, 06:22:01 AM
Arrived here too!
Thanks!

Title: Re: S800 Support Thread
Post by: Indecline on December 14, 2011, 08:09:10 PM
boards arrived in houston yesterday. they look nice!! thanks again peter!!
Title: Re: S800 Support Thread
Post by: kpearsall on December 15, 2011, 11:04:48 AM
boards arrived in wisconsin. Thank you peter I can't wait to build these!!!
Title: Re: S800 Support Thread
Post by: craigmorris74 on December 26, 2011, 02:13:51 PM
Would an  +-24V 0.6A Power One supply adjusted down to +-18V be suitable for powering 2 channels of S800 EQ and 4 channels of W492 EQ? (the W492 has opamps rated for higher voltage).

Thanks,
Craig
Title: Re: S800 Support Thread
Post by: spase on December 26, 2011, 03:10:36 PM
....
Title: Re: S800 Support Thread
Post by: spase on January 09, 2012, 09:46:25 AM
Finally i take those boards from customs.Thank you Mr.Peter.
Kind Regards
Spase
Title: Re: S800 Support Thread
Post by: peterc on January 09, 2012, 02:51:28 PM
Hey Spase

Glad you finally got them, enjoy the project

Peter
Title: Re: S800 Support Thread
Post by: spase on January 11, 2012, 02:38:02 PM
im starting to collect the caps for this project.anyone can tell me what voltage should i need to buy?
Title: Re: S800 Support Thread
Post by: peterc on January 11, 2012, 03:31:21 PM
25v or 35v for electrolytic, other caps start at 50v so those will be fine.
Title: Re: S800 Support Thread
Post by: spase on January 11, 2012, 10:53:17 PM
and for the switches i need spdt and dpdt ( on - on ) right?
Title: Re: S800 Support Thread
Post by: evilcat on January 12, 2012, 04:18:26 AM
spdt for frequencies (lo and hi) and 3PDT for the bypass
Title: Re: S800 Support Thread
Post by: spase on January 12, 2012, 08:25:50 PM
http://www.omeg.com/br2bubr2.htm can i use this pots im gonna remove those metal ears from them? they are 22k lin omegs
Title: Re: S800 Support Thread
Post by: bpucekov on January 13, 2012, 05:27:54 AM
audio maintenance sell full kits with all components at very reasonable price
http://www.audiomaintenance.com/acatalog/kits.html
 
Title: Re: S800 Support Thread
Post by: MasonAtom on January 25, 2012, 09:47:39 AM
I finally got around to completing my build (from the original group buy!).

I've posted some pictures here: https://plus.google.com/u/0/photos/116886998028395181572/albums/5701571111086718129 (https://plus.google.com/u/0/photos/116886998028395181572/albums/5701571111086718129).

I haven't done any extensive testing on it yet, but I like what I've heard so far when using it on DI bass and guitar.

Mason
Title: Re: S800 Support Thread
Post by: spase on January 25, 2012, 09:54:35 AM
403. That’s an error.
We're sorry, but you do not have access to this page. That’s all we know.

Fix your link
Title: Re: S800 Support Thread
Post by: Paul Fawcett on January 25, 2012, 12:59:11 PM
403. That’s an error.
We're sorry, but you do not have access to this page. That’s all we know.

Fix your link

Works for me.
Title: Re: S800 Support Thread
Post by: audiophreak on January 25, 2012, 01:13:55 PM
403. That’s an error.
We're sorry, but you do not have access to this page. That’s all we know.

Fix your link

  403 error message for me too :(
Title: Re: S800 Support Thread
Post by: ZenZeven on January 29, 2012, 04:45:28 PM
PeterC cant seem to PM you.
Apparently your box is full?
Does this meen you dont
have any PCB's left over for me?

-Frans
Title: Re: S800 Support Thread
Post by: craigmorris74 on March 26, 2012, 09:07:47 AM
I've never been able to get the LMF of one of my two channels to work.  Everything else is fine with that channel, but when I boost or cut the gain know nothing happens.  I've checked for bad soldering, and am to the point were I'll have to pull each component out of this section to see where the problem is.  Is there one part that would completely stop this section from working? 

Thanks,
Craig
Title: Re: S800 Support Thread
Post by: shabtek on March 26, 2012, 09:42:51 PM
@craigmorris; could be a bad pot--wiper not making contact
Title: Re: S800 Support Thread
Post by: craigmorris74 on March 27, 2012, 10:08:30 AM
-shabtek,  thanks for the tip.  I'll desolder the gain/boost pot and see if its working properly.
Title: Re: S800 Support Thread
Post by: craigmorris74 on April 04, 2012, 11:54:06 AM
Pulled out the pots from the LMF section, and they seem to be working fine.  Any other components that need checking to get this section going?

Thanks
Craig
Title: Re: S800 Support Thread
Post by: darnell on April 04, 2012, 03:32:25 PM
Any pcb's left?  I would love a bunch.

D.
Title: Re: S800 Support Thread
Post by: craigmorris74 on April 04, 2012, 04:58:56 PM
The schematic on this project is kind of hard to track down.  See the attachment PDF.
Title: Re: S800 Support Thread
Post by: jordan s on April 11, 2012, 01:05:53 AM
Also interested in some boards
Title: Re: S800 Support Thread
Post by: supiarmando on April 11, 2012, 12:19:06 PM
I would buy 30 PCBs!
Title: Re: S800 Support Thread
Post by: supiarmando on April 12, 2012, 05:18:03 PM
I must chance the number, 2 friend of mine cancelled, because they are angry. Now I need only 10 but this is 100%.
Title: Re: S800 Support Thread
Post by: kpearsall on May 01, 2012, 04:46:46 AM
Craig, did you ever figure out your LMF issue? I'm having the same thing happen.
Title: Re: S800 Support Thread
Post by: solderspongebob on May 01, 2012, 05:15:52 AM
I'm in for 2 PCBs if another run is being considered (don't suppose there's any self-etch or gerbers around is there?).
Title: Re: S800 Support Thread
Post by: kpearsall on May 01, 2012, 05:38:50 AM
Craig nevermind I got it. Check the voltages on U4. My -V was 2 volts lower and that's what killed it. I resoldered that and it works fine! The odd thing was, that measuring the same place for continuity said the connection was ok, but power it up and I was missing 2 volts!
Title: Re: S800 Support Thread
Post by: craigmorris74 on May 01, 2012, 09:34:30 AM
I got my LMF working.  I pulled out the pots and resoldered all related components (again), and it finally started working.
Title: Re: S800 Support Thread
Post by: kpearsall on May 01, 2012, 10:04:15 AM
great craig! glad it's working out for you :)
Title: Re: S800 Support Thread
Post by: Category 5 on July 08, 2012, 02:54:26 AM
Got a full kit including PCB's, Case and faceplace, knobs and components.  Add a toroid and some connectors and you have the whole deal ready to build.  Need to unload some stuff so anyone wanting to build one or get a couple more chann;es can have it cheap.
Title: Re: S800 Support Thread
Post by: supiarmando on August 24, 2012, 02:34:12 PM
Today I made a vector pdf so all poor guys like my can go ahead and etch themself! Please note that this is done with illustrator and not eagle!!!
Title: Re: S800 Support Thread
Post by: tonning on September 06, 2012, 10:14:25 AM
Anyone knows where to get PBCs for the s800 at the moment (if possible)?
Title: Re: S800 Support Thread
Post by: evilcat on September 06, 2012, 02:22:50 PM
You should ask PeterC, he's the one who've launched this project and who's making boards.

Ben
Title: Re: S800 Support Thread
Post by: detonator on September 06, 2012, 07:33:01 PM
Today I made a vector pdf so all poor guys like my can go ahead and etch themself! Please note that this is done with illustrator and not eagle!!!
Great work. Can you also post the slikscreen side?
Title: Re: S800 Support Thread
Post by: tonning on November 29, 2012, 02:49:51 AM
Hi,

Will this trafo be able to drive 8 boards?

http://www.musikding.de/Passive-parts/Transformers/Toroidal-transfomer/Toroidal-transformer-230V-2x-15V-50W::2883.html
Title: Re: S800 Support Thread
Post by: peterc on November 29, 2012, 04:31:36 AM
That transformer will be fine for 8 channels.

Peter
Title: Re: S800 Support Thread
Post by: tonning on November 29, 2012, 06:29:45 AM
Cool, thanx :)
Title: Re: S800 Support Thread
Post by: supiarmando on November 29, 2012, 09:20:02 AM
Today I made a vector pdf so all poor guys like my can go ahead and etch themself! Please note that this is done with illustrator and not eagle!!!
Great work. Can you also post the slikscreen side?
Title: Re: S800 Support Thread
Post by: justanalogue on December 02, 2012, 12:30:14 PM
Just finishing my 800's and found out that I soldered C18, 19 and 20 in the WRONG positions!
Pay attention to that, it took me a day to find out!
Couldn't get to work..........
It's nice to have the option for different pitches but it got me fooled >:(


Willem

Title: Re: S800 Support Thread
Post by: tonning on December 06, 2012, 02:29:49 AM
Hi,

Two questions for the green psu for the s800:

Will this heatsink be big enough for running 8 channels (one for each regulator)?: http://www.musikding.de/Nuts-washers-screws/Heatsinks/Heatsink-19mm-22K-W::2108.html

And will this do the job as the 100nF caps on the green psu?: http://www.musikding.de/Passive-parts/Capacitors/Film-Capacitors/Arcotronics-MKT/MKT-0-1uF::521.html

I think the BOM links to polarized electrolytics, but the PCB does not show any ploarization, so I thought the MKTs might work? ???
Title: Re: S800 Support Thread
Post by: peterc on December 06, 2012, 03:23:53 AM
Yes to both

Peter
Title: Re: S800 Support Thread
Post by: tonning on December 06, 2012, 05:15:31 AM
Awesome, thanks Peter :)
Title: Re: S800 Support Thread
Post by: tonning on December 07, 2012, 01:22:34 AM
Sorry for asking all these noob questions.. but are the caps in Collins kit marked with u1k = 100nF?
Title: Re: S800 Support Thread
Post by: peterc on December 07, 2012, 02:09:23 AM
A quick google search comes up with this:

https://www.google.co.za/search?q=capacitor+marking&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

Peter
Title: Re: S800 Support Thread
Post by: tonning on December 10, 2012, 05:20:22 AM
Think I found a table confirming my assumption, thanks :)
Title: Re: S800 Support Thread
Post by: andia on December 11, 2012, 04:50:54 AM
are there any pcbs left for this project? thanks alot, andi
Title: Re: S800 Support Thread
Post by: straypacket on January 07, 2013, 08:09:39 AM
bump on the PCBs.  I would be interested in supporting the community by purchasing PCBs :)

(read:  I would  screw them up trying to make them myself)
Title: Re: S800 Support Thread
Post by: straypacket on February 08, 2013, 07:53:25 AM
Hi Peter - I sent a PM for payment info for 2 S800 and 2 PSU pcbs
Title: Re: S800 Support Thread
Post by: BricktopRecording on February 12, 2013, 02:31:20 PM
If pcbs become available again I'd be good for at least 4.
Title: Re: S800 Support Thread
Post by: straypacket on February 21, 2013, 07:01:12 PM
Hi Peter,

Payment sent for 2 S800 PCBs and 2 PSU PCBs.

Title: Re: S800 Support Thread
Post by: hansherman on April 05, 2013, 11:30:15 AM
Hi

Finally finishing this project off, it also happens to be my first. I just have one quick question.

Is it ok to use the on-on mini toggle switch that came with the audio maintenance for the power switch?

I read elsewhere on another site that mini toggle switches should be avoided for power switch situations.

Cheers!
Simon
Title: Re: S800 Support Thread
Post by: spase on May 06, 2013, 11:10:10 PM
is that a link between R41 and R42?
Title: Re: S800 Support Thread
Post by: peterc on May 07, 2013, 02:00:59 AM
Quote
Is it ok to use the on-on mini toggle switch that came with the audio maintenance for the power switch?

Most toggle switches have a voltage and current rating printed or engraved into the body of the switch.

Have a close look and see if there is anything there.

Peter
Title: Re: S800 Support Thread
Post by: Rockitdog on May 21, 2013, 03:47:37 PM
Hi everyone.

My S800 boards are on the way, parts kit from AML is on the way.

Can someone recommend a power transformer? (230V primary) Brand names and places to order? I've had some bad luck with locally supplied rubbish recently.

I did read elsewhere that I can use Mnats power-supply board with the S800. (I've got one already) Has anyone had any luck with this?
If not can anyone give me an idea of where i would find a schematic, or even possibly a power-supply pcb that would be suitable?

Thanks!

Mnats Power-supply board that I have
(http://mnats.net/images/psu_2009_bare_blue_small.jpg)

I did also find a pcb layout for for the Green Pre PSU (I just want to confirm that this is a common option)

Which would be a better option if the Mnats board can be used?
Title: Re: S800 Support Thread
Post by: Rockitdog on May 23, 2013, 05:23:56 AM
Anyone still alive that knows anything about this project?

Peterc?

I know this is an old project and support is hard to find, but surely someone can help me here?

Thanks
Title: Re: S800 Support Thread
Post by: peterc on May 23, 2013, 06:02:38 AM
PM me your phone number.

From RS :
http://za.rs-online.com/web/c/power-supplies-transformers/transformers/toroidal-transformers/?sort-by=default&sort-order=default&applied-dimensions=4294499937&lastAttributeSelectedBlock=4294511534

30Va or 50VA should be fine depending on how many channels. Bit more expensive but Nuvotem make good transformers.

Peter
Title: Re: S800 Support Thread
Post by: Rockitdog on May 23, 2013, 07:46:15 AM
PM me your phone number.

From RS :
http://za.rs-online.com/web/c/power-supplies-transformers/transformers/toroidal-transformers/?sort-by=default&sort-order=default&applied-dimensions=4294499937&lastAttributeSelectedBlock=4294511534

30Va or 50VA should be fine depending on how many channels. Bit more expensive but Nuvotem make good transformers.

Peter

Peterc, thank you so much. Really helpful. I will PM you this evening, Im a bit hectic today.

Thanks once again.
Title: Re: S800 Support Thread
Post by: ptiroc on June 10, 2013, 07:16:15 AM
Hi everybody ! I'm despaired ! I can't found any pcb's or pcb layout for this project....Peter, do you still sell this pcb's (for the eq and for the psu)?  Thanks
Title: Re: S800 Support Thread
Post by: Rockitdog on June 10, 2013, 08:10:06 AM
Hi ptiroc.

I did try and message Peterc a few times but he diddnt get back to me. I dont think he is doing the pcb's anymore. Although I must thank him for helping me out with the power transformer selection. (Thanks again Peter)
 I was lucky enough to get some boards from another forum member who had them laying around. There is however some info available on peters'c twin-x account. Low rez schematic and a bom.

http://www.twin-x.com/groupdiy/thumbnails.php?album=488

I just got the components kit from Colin at AML. really amazing kit. And I finished stuffing my boards yesterday without any issue. The power supply that seems to be recommended is the Green Pre PSU. You can find info on that here (Including self etch files). There is also an image floating around of parts you can exclude when using the Green PSU for the S800 ( Minus Phantom power).

http://www.twin-x.com/groupdiy/index.php?cat=10096

Along with some other bits and bobs. I must say, this project has been on my wish list for some time. Im happy to be doing it now despite the lack of general interest there seem to be in this project these days.

The best I can do PCB wise is this scan I took of mine. (Would it be ridiculous to suggest tracing it in Corel or Photoshop? It is Peterc's pcb artwork design)   

Good luck!
Title: Re: S800 Support Thread
Post by: ptiroc on June 10, 2013, 11:16:27 AM
hello rockitdog. Many thanx for the (fast) response. I already have the schem, but it's a bit fluzzy and my knowledge in electronics won't suffice to do the pcb by my own. i'll see with your scan, it's a very good quality...:). Thanx again. cheers
Title: Re: S800 Support Thread
Post by: Paul Fawcett on July 17, 2013, 02:45:44 PM
This is for those of you that have read through the whole thread and caught that some users found that their real-world sweeps diverged significantly (especially for the low mid and high mid controls)....

To help get to the bottom of this, I simmed in LTSpice (with ideal opamps) the entire Trident EQ circuit. Based on this sim, I see that the LMF should range from about 100Hz-840Hz, and the HMF from about 1KHz-14Hz.  This is quite consistent with the results found earlier in this thread by Ben Lindell, and is markedly different than what is on the old front panels, especially for the LMF control.  The intermediate frequency values for these controls will naturally strongly depend on the taper of the particular 100 rev log pots you end up with, but at this point I would probably opt to use the front panel values that Ben used (and provided in his updated faceplate file earlier in the thread). 
Title: Re: S800 Support Thread
Post by: j.frad on August 12, 2013, 10:58:40 AM
Hey everyone, I'm almost done with my stereo s800 but on one channel the mid bands don't work.
I've been staring at the pcb the whole day...

The gmail account is down and I can't find the schematic, could someone please email it to me?
jules (dot) fradet (at) hotmail (dot) fr
 thanks!
Jules
Title: Re: S800 Support Thread
Post by: peterc on August 12, 2013, 03:29:19 PM
Jules

Docs are here

http://twin-x.com/groupdiy/index.php?cat=10096

Peter
Title: Re: S800 Support Thread
Post by: j.frad on August 13, 2013, 05:28:29 AM
Thanks! hope to get thing thing going today
Title: Re: S800 Support Thread
Post by: Rockitdog on August 16, 2013, 04:51:04 AM
Finished up my S800 a couple of weeks back, thought I would post a pic. Big thanks to TDM for having some left over PCB's and a Big thanks to Colin at Audio Maintenance Limited (Slenderchap) for the amazing parts kit and big thanks to Peterc for the help and the docs. I am loving this EQ!! Its fantastic! Went for a bit of an unconventional DIY front panel design, diddnt turn out too bad and it looks kind of unique if you ask me. Its in good company with my Hairball REV A 1176 (Which I love to bits!!)

Next? A stereo LA4.

(http://3.bp.blogspot.com/-JcLoTNM7cKk/Ug3nC88m1FI/AAAAAAAAA3U/VLQk1-GQnl0/s1600/S800-EQ-1small.jpg)
Title: Re: S800 Support Thread
Post by: peterc on August 16, 2013, 03:27:23 PM
Nice!

One of the best looking projects in a long time.

Peter
Title: Re: S800 Support Thread
Post by: iampoor1 on August 18, 2013, 12:54:18 AM
Does anyone have Gerber files for the eq boards if they are not being sold anymore?
Title: Re: S800 Support Thread
Post by: tazwolf on August 24, 2013, 01:50:48 PM
Hi
I want to hard wire the s800 as always on and without the switch, I want to use a relay bypass
how do I wire the pcb without the switch so it is always on?
im sure i have seen a diagram of how to wire it like this but I have not been able to find it again.

regards
/Taz
Title: Re: S800 Support Thread
Post by: Siegfried Meier on November 22, 2013, 10:20:39 PM
Did anyone ever do a real FPD file for this project? 

Thanks!
Sig
Title: Re: S800 Support Thread
Post by: Spencerleehorton on March 18, 2014, 06:27:44 AM
Hi all,

This unit looks great and just what I'm looking for, where are pcbs available or self etch files?

Regards

Spence.
Title: Re: S800 Support Thread
Post by: peterc on March 18, 2014, 09:43:21 AM
Would anyone be interested in a 500 series layout?

I have started to do this, should be done in a few days.

Regards
Peter
Title: Re: S800 Support Thread
Post by: mitsos on March 18, 2014, 01:06:36 PM
possibly would be.. depends what pots you end up deciding to use and their availability/cost?  You mentioned maybe going dual concentric...
Title: Re: S800 Support Thread
Post by: peterc on March 18, 2014, 03:39:14 PM
Pots will not be dual concentric, but separate for the Freq and Gain.

My preference is to use Omeg Eco (green bodies) as I have had good results and they are very reasonably priced.

It means mounting the switches onto the front panel instead of the PCB as I usually like to do, but 6 pots take up the whole width of the panel.

Peter
Title: Re: S800 Support Thread
Post by: mitsos on March 18, 2014, 05:54:38 PM
I'd look at smaller pots, then you can use the little CK (or other) PC mounted toggles for the freqs.   Maybe someone can stock them for you (preferably in the US, everything is easier and cheaper that way).  I just saw the TB audio site has a kit of Bitech pots for the neumann 492 EQ, those are the same pots we use in the Pultec, they're very nice.  They also make smaller ones, GR uses them in the harrison EQ, now that has a lot of pots...   
Title: Re: S800 Support Thread
Post by: Gearsix on August 08, 2014, 10:34:53 AM
Hello Peter, any new about the S800 eq in 500 series layout?
Title: Re: S800 Support Thread
Post by: peterc on August 08, 2014, 03:01:36 PM
Yes, it will happen in the next week or so, just finishing off another project.

Peter
Title: Re: S800 Support Thread
Post by: Gearsix on August 09, 2014, 01:38:59 AM
Great Peter!
Title: Re: S800 Support Thread
Post by: ipagel on August 09, 2014, 05:58:55 AM
Would anyone be interested in a 500 series layout?

I have started to do this, should be done in a few days.

Regards
Peter

I'm definitely on the 500 series version.

 :)
Title: Re: S800 Support Thread
Post by: peterc on August 27, 2014, 04:20:05 PM
Update on this project, board is done and I will get a quote for it tomorrow.

Some pics:

(http://img.photobucket.com/albums/v318/peter_cornell2002/S800/Front-w-Switches.jpg) (http://smg.photobucket.com/user/peter_cornell2002/media/S800/Front-w-Switches.jpg.html)

(http://img.photobucket.com/albums/v318/peter_cornell2002/S800/S800-Top-1.jpg) (http://smg.photobucket.com/user/peter_cornell2002/media/S800/S800-Top-1.jpg.html)

(http://img.photobucket.com/albums/v318/peter_cornell2002/S800/S800-Top-3.jpg) (http://smg.photobucket.com/user/peter_cornell2002/media/S800/S800-Top-3.jpg.html)

(http://img.photobucket.com/albums/v318/peter_cornell2002/S800/S800-Top-2.jpg) (http://smg.photobucket.com/user/peter_cornell2002/media/S800/S800-Top-2.jpg.html)

The only way I could do this was to put the Bypass and Freq select switches on the underside of the boards.

If there is any further interest I will do a front panel as well. I will open a White Market thread as soon as I have more details.

Peter
Title: Re: S800 Support Thread
Post by: ipagel on August 27, 2014, 05:28:09 PM
Looks great peter.
What would be included?

PCB and front plate?

 :)
Title: Re: S800 Support Thread
Post by: Category 5 on September 05, 2014, 10:24:44 AM
500 series?  Brilliant!!!   Count me in.
Title: Re: S800 Support Thread
Post by: fragletrollet on March 13, 2015, 07:03:20 PM
Uhm... day of the dead (thread) here...

I see AML still sells kits for these, and I`ve seen frontpanels being sold aswell... but is the project still alive?  8)
Title: Re: S800 Support Thread
Post by: peterc on March 31, 2015, 09:09:39 AM
Hi Frag

There was not a lot of response to this idea and so it is dormant, but still lurking!

Peter
Title: Re: S800 Support Thread
Post by: fragletrollet on March 31, 2015, 10:37:31 AM
Hey Peter, thanks for getting back to me. Tried sending you a PM, but your inbox is full :)

Well I`ll be following this thread hoping that you get around to reprinting the boards  8)
Title: Re: S800 Support Thread
Post by: Jonas05 on April 21, 2015, 10:08:58 AM
I'm also intrested in maybe 4 PCBs. I would prefer rackmount Units but API500 is better than nothing ;)
Let me know when you are making boards!
Title: Re: S800 Support Thread
Post by: straypacket on April 23, 2015, 09:07:22 AM
Also interested in 3 more standard PCBs.
Title: Re: S800 Support Thread
Post by: john12ax7 on May 25, 2015, 01:22:15 AM
Is there a schematic for these? Don't think the Gmail account works anymore.
Title: Re: S800 Support Thread
Post by: JW on June 29, 2015, 11:02:34 AM
Hey folks,

Does anybody sell cases for an 8 channel S800 these days? Or at least a front panel?
Title: Re: S800 Support Thread
Post by: JW on July 01, 2015, 10:56:50 AM
Fragletrollet,

Where have you seen front panels? Are you talking about 2 channel or 8 channel?
Title: Re: S800 Support Thread
Post by: weiss on July 01, 2015, 01:20:09 PM
Hey folks,

Does anybody sell cases for an 8 channel S800 these days? Or at least a front panel?

I think one guy offered one in the black market few days ago
Title: Re: S800 Support Thread
Post by: pablobolche on August 14, 2015, 05:18:31 PM
hi there…
working on a couple of s800…got the aml Kit..
 seems to work fine except for the bypass…when I engage the eq I get a gain boost..

thought it might be the calibration so...
I calibrated the board…feeding a 1.22 v 1k tone… getting 1.22v on the output with eq on…
I bypass and get 0.23v on the output..

happens the same on both EQs…I am not an expert but have learned resistor color chat thanks to this protect and everything seems ok…

I have read through the thread and can't find where my problem might be

all help is welcome


Title: Re: S800 Support Thread
Post by: ZekeProductions on October 13, 2015, 10:43:04 PM
Ok,

This may help. What I did was get 30mm standoff and join the boards together, I then added some 3mm weather stripping on the top and bottom of the case, when you screw it together it clamps down on the PCB's, holding them all in place.

(http://www.matt-allison.com/diy/S800/8_channel_PCB_wired.jpg)

Cheers

Matt

Sorry for the noob question here but I've started building this and I was thinking of using this method that matta suggested. Does anyone know what kind of wires I can use to do this method. is it just regular hookup wire 24awg solid core like in the link below?

http://www.mouser.com/ProductDetail/Alpha-Wire/3050-RD005/?qs=sGAEpiMZZMtW9UaYX5J1tM4kpfBO860L9v%2f3ZB7f%2f88%3d


Thanks in advanced
Title: Re: S800 Support Thread
Post by: dane999 on December 02, 2015, 05:08:57 AM
Hello,

Just to share some DIY happiness, I finally built my unit, AML kits, case by Frank et frontpanels.de, PSU is a Vellman 1A kit... Very very happy with the sound, perfect on bass, guitars and drums, which are fortunately 95% of my job  8), and very quiet unit.
Thanks a lot to everyone who made this possible !

(https://scontent-cdg2-1.xx.fbcdn.net/hphotos-xap1/t31.0-8/12314310_857725254345244_5659667312787404219_o.jpg)
(https://scontent-cdg2-1.xx.fbcdn.net/hphotos-xfl1/t31.0-8/11223986_857725034345266_3310388190924568634_o.jpg)
(https://scontent-cdg2-1.xx.fbcdn.net/hphotos-xfa1/t31.0-8/12307323_857725304345239_5450822699814895875_o.jpg)
Title: Re: S800 Support Thread
Post by: JW on January 26, 2016, 11:45:34 AM
Okay, I'm working on a 4 channel unit here. I'm curious which caps might be fun to experiment with to change the sound a bit. Wimas are cheap so I thought I'd at least try with one channel to see if I like them better. I'm guessing C5 and C6, which are in the high freq. circuit. Maybe C11-C14? I'm not sure which caps will effect the sound most. Are the caps in the sweep circuit very important?

???

Second question/comment.  Somebody back in this thread mentioned getting rid of hiss in the high shelf by using opa267 for U1. Looks like that chip is SMD only. So an adaptor would be needed. I also noticed that the datasheet has those chips operating at 12V max! Hmmmm

So, I don't think I'll even try that. I don't want to lower the supply voltage just to try out one chip. Opa134 might be interesting though. Yet, someone else (please forgive me for forgetting who it was. I don't want to dig through the whole thread right now) seems to have solved their problem by swapping back to the original TLO71 from Opa134. I wonder if this was entirely a current consumption issue. . . .

I do have a big power transformer .

Title: Re: S800 Support Thread
Post by: JW on February 01, 2016, 11:55:20 AM
Bump

???
Title: Re: S800 Support Thread
Post by: john12ax7 on February 01, 2016, 08:55:46 PM
I don't have a schematic, but in general all caps affect the sound to some extent. Wima film caps would be a good choice to experiment with in all the filter sections.

Opa134 can substitute for tl071, just at a higher current draw. Opa134 is better in most ways, but sonically you might prefer one or the other.
Title: Re: S800 Support Thread
Post by: peterc on February 01, 2016, 11:38:07 PM
I would not expect huge changes but try it and see.

Most of my builds are done with Wima caps MKS4, as far as i remember.

I think the opamp change will have more of an effect, but without trying it would be hard to tell.

This eq has a really 'in your face' nature.

Peter
Title: Re: S800 Support Thread
Post by: JW on February 05, 2016, 07:40:48 PM
Can someone help me with wiring this power transformer? It's an Antek AS-0518 Here's it's spec page:  http://www.antekinc.com/content/AS-0518.pdf

For the primary, I'm in the U.S, so it's in parallel right? Meaning I tie together the two reds for the AC hot, and the two blacks for the AC neutral?  What about the purple (extra static shield) Would I tie that to the Chassis?

For the secondaries, parallel again? Tie the middle blue and green wires together and the outer Blue and green are my secondary leads to the power supply pcb?
Title: Re: S800 Support Thread
Post by: peterc on February 06, 2016, 01:52:27 AM
Correct on the primaries

Secondaries are wired in series, tie the central Blue and Green together - make sure you are not shorting out one of the secondaries!

This combined join gfoes to 0v/Chassis ground as illustrated bit 'ct' in this diagram.

http://3.bp.blogspot.com/-PXkB2Ay6OHc/UEHP-rOgR3I/AAAAAAAAD_U/YeqEd1jmXlI/s1600/dual-regulator-power-supply-circuit-300x247.gif
Title: Re: S800 Support Thread
Post by: fragletrollet on February 06, 2016, 08:20:36 AM
So are boards available again?
Title: Re: S800 Support Thread
Post by: JW on February 06, 2016, 12:16:54 PM
Thanks Peter,

Where should I ground the electro static shield? (purple wire on the primary)
Title: Re: S800 Support Thread
Post by: peterc on February 06, 2016, 02:39:58 PM
I think at the Chassis ground
Title: Re: S800 Support Thread
Post by: fragletrollet on February 07, 2016, 06:25:05 AM
So are boards available again?

So I`m guessing not, that these are all people who got the old pcb?
Title: Re: S800 Support Thread
Post by: peterc on February 07, 2016, 06:55:38 AM
Hi Frag

I can do another run but would need a minimum of 25 boards @ $20 each. Costs have gone up on this end.

Let me know and I will open a White market thread.

Peter
Title: Re: S800 Support Thread
Post by: fragletrollet on February 08, 2016, 05:48:36 AM
I`d be up for 8... hope someone else chimes in aswell  8)
Title: Re: S800 Support Thread
Post by: TDRS on February 12, 2016, 10:51:24 PM
I would commit to 8 as well.
Title: Re: S800 Support Thread
Post by: junkface on April 22, 2016, 09:11:26 AM
I'll do 4
Title: Re: S800 Support Thread
Post by: junkface on April 22, 2016, 10:06:07 AM
I'll do 4
or 8 if it'll get us over the minimum quicker.
Title: Re: S800 Support Thread
Post by: peterc on April 25, 2016, 04:35:23 AM
Hi Junk, TDR and Flag

I have got a quote from my PCB plant, delivery to me is 10-14 working days, and shipping to you is 2-3 weeks.

So about a 6 weeks delay before you get the boards.

Is that OK with you? If so, I will order them and put up a White Market thread as soon as I receive them.

Regards, Peter
Title: Re: S800 Support Thread
Post by: TDRS on April 25, 2016, 07:31:42 AM
Fantastic! Thank you Peter. 
Title: Re: S800 Support Thread
Post by: fragletrollet on April 25, 2016, 10:08:35 AM
Great!
Title: Re: S800 Support Thread
Post by: JW on April 25, 2016, 05:20:57 PM
Ah,

Just finished 4, so I guess I should order another 4 because they're frikkin awesome.  Junk,  if you're just ordering 8 to get past the minimum, let me know. I'll take half of those if you want, or maybe I can add 4 more Peter? Hmmmmmm

Thanks
Jon
Title: Re: S800 Support Thread
Post by: peterc on April 25, 2016, 05:47:04 PM
Thanks for the support guys, I will order 40 and put them in the WM section

Peter
Title: Re: S800 Support Thread
Post by: junkface on April 26, 2016, 07:00:43 AM
Thanks Peter! Jon,  I was just originally asking for 8 to get the min # up, but after some thought it's gonna be a whole lot cheaper to do 8 at once than to do 4, fall in love and do another 4 later.  ;)
Title: Re: S800 Support Thread
Post by: jimfowler on May 15, 2016, 10:06:15 AM
Any boards still available?  I see nothing in the white market.

- Jim
Title: Re: S800 Support Thread
Post by: peterc on May 15, 2016, 10:28:57 AM
Hi Jim

The boards have been ordered, 3 week lead time unfortunately.

I will post here as well as soon as they arrive.

Peter
Title: Re: S800 Support Thread
Post by: Le Roux on May 19, 2016, 01:05:45 PM
The boards you ordered, are they 500 series?

Thanks
Neil
Title: Re: S800 Support Thread
Post by: peterc on May 19, 2016, 01:40:03 PM
Hi Neil

Nope, these are the original boards, not the 500 series PCBs

Peter
Title: Re: S800 Support Thread
Post by: Le Roux on May 19, 2016, 02:32:20 PM
Thanks Peter.

I am interested in a pair if there's some extras.
I will keep an eye on this thread

Thanks
Neil
Title: Re: S800 Support Thread
Post by: Munchkin on May 26, 2016, 11:10:53 PM
I'd also be up for a couple of boards. Thanks.
Title: Re: S800 Support Thread
Post by: peterc on June 03, 2016, 01:58:16 AM
Hi all

Boards are now available in the White Market

http://groupdiy.com/index.php?topic=62900.0

Regards
Peter
Title: Re: S800 Support Thread
Post by: fazeka on June 07, 2016, 02:42:12 AM
With Peter making PCBs again, anyone going to have front panels?
Title: Re: S800 Support Thread
Post by: JW on June 12, 2016, 07:39:48 PM
Finished a 4 channel unit
Title: Re: S800 Support Thread
Post by: JW on June 12, 2016, 07:43:40 PM
And the guts
Title: Re: S800 Support Thread
Post by: JW on June 12, 2016, 07:56:10 PM
And a question. I'm a little confused as to how to hook these up to my consoles send/return jacks. I've attached a schematic. It's a Yamaha PM2000, and the send/return is listed as "input interstage" in the top right of the schematic.

According to yamaha literature, these are 600 ohm sends (I can't remember the returns input impedance) But anyway, there's no transformers. Just unbalanced send and return.

Here's the handy Rane literature about system interconnects: http://www.rane.com/note110.html

Looks like figure 13 would be right going into the S800's from my sends,
and figure 3 or 5 (?) would be correct coming out of the S800 and into my returns?

Can someone confirm this?
Title: Re: S800 Support Thread
Post by: peterc on June 13, 2016, 10:13:56 AM
Hi JW

13 looks good for the sends to the S800.

5 looks right for the returns, but I would not join 1 + 3 on the EQ output.

Peter

Title: Re: S800 Support Thread
Post by: TDRS on June 30, 2016, 01:45:14 PM
With Peter making PCBs again, anyone going to have front panels?
. How about just a template if there are no cases or front panels.  I noticed most of the docs and templates from this thread are so old the links no longer work.
Title: Re: S800 Support Thread
Post by: fazeka on July 02, 2016, 05:38:47 AM
+1

How about just a template if there are no cases or front panels.  I noticed most of the docs and templates from this thread are so old the links no longer work.
Title: Re: S800 Support Thread
Post by: Eugene Aon on August 06, 2016, 09:52:17 AM
Are there any boards left for sale? Cant find white market thread..
Title: Re: S800 Support Thread
Post by: TDRS on August 14, 2016, 05:37:59 PM
I'm just getting started with these boards. I downloaded the schematic but it's such a low resolution I can't read it. Is there a high resolution schematic other than the one in the download section for docs here. My problem is R41 and R42. Heres a pic, I see 3 resistors positions, is 1 and 3 R41 and R42? If so, whats #2?  I can't read where the pin hole goes through the board. Any tips?
Title: Re: S800 Support Thread
Post by: TDRS on August 14, 2016, 05:48:10 PM
I see now that it's a link. So is it 1 is R41, 2 is a link and 3 is R42?
Title: Re: S800 Support Thread
Post by: peterc on August 14, 2016, 06:05:03 PM
In this case:
1 = LK = oR link
 2 = R41 = 47k
3 = R42 = 47k

Hope that helps.
Peter
Title: Re: S800 Support Thread
Post by: TDRS on August 14, 2016, 10:35:09 PM
It does indead. Thanks Peter.
Title: Re: S800 Support Thread
Post by: dogfaceaudio on November 07, 2016, 01:04:00 PM
Just got my kit from Colin, though it didn't include the push button 4 pole switch. Anyone know of a Mouser part for this? Or where to order one? Thanks.
Title: Re: S800 Support Thread
Post by: Munchkin on November 27, 2016, 01:50:12 AM
Just got my kit from Colin, though it didn't include the push button 4 pole switch. Anyone know of a Mouser part for this? Or where to order one? Thanks.

Yeah, I'm putting my S800 together soon and spent a good chunk of yesterday trying to sort the switches out.  Part number is SPUN194700 and they're inexpensive, but you have to buy the switch caps separately. Part number UE200011 (Black), UE200013 (white), comes in other colours too. I found here in the UK that Mouser wanted £33 of goods purchased before free shipping and from what I remember there's a flat rate of around £12 - £15 otherwise. I may be wrong about that as it's been a while since I ordered anything from them, but too much for a few quids worth of switches. At least they sell the switch caps though, unlike R.S and some of the other big companies (I think I checked Farnell & Canford aswell). Kinda odd to sell the switches but not the caps ????.   Colin also sells  SPUN switches, dunno about the caps, didn't see any on the website. So in the end I ordered a couple of 3PDT toggle switches as part of an order from Banzai. Oh well. Hope you have better luck..
Title: Re: S800 Support Thread
Post by: craigmorris74 on February 19, 2017, 09:28:12 PM
Greetings folks,

I few years back I built a couple of these, but when I hooked them up, I wired one of the power supplies backward (+ to - and vice versa) and blew up one of the electrolytic capacitors.  Upon further testing, I noticed this channel is still pretty noisy-it sort of sounds like the ocean when inserted.  Rather than recap the whole board, I was wondering if there was a certain electrolytic cap that would most likely be causing my noise problem.

Thanks,
Craig
Title: Re: S800 Support Thread
Post by: peterc on February 20, 2017, 03:10:41 AM
HI Craig

Were the opamps in at the time? They might be noisy......

The 2 main filter caps both need to be changed, next to the power connector.

Start there, but you might need to do more, unfortunately.

Peter
Title: Re: S800 Support Thread
Post by: craigmorris74 on February 20, 2017, 06:02:47 PM
Thanks for the reply, Peter.  The opamps were in when this happened, so I can check those, and replace the two lytics first.  Appreciate the feedback!

UPDATE:  One of the opamps was causing the noise.  Replaced them all and the problem went away.
Title: Re: S800 Support Thread
Post by: NannerPuddin on June 28, 2017, 04:01:57 PM
I tried the white market link so I could get a few of the boards.  I got an error.  What do I need to do to either get on the white market or otherwise get a few of the boards?

Thanks,

Doug
Title: Re: S800 Support Thread
Post by: audiophreak on June 28, 2017, 05:11:31 PM
I may have a couple of these , I'll check and send PM
Title: Re: S800 Support Thread
Post by: audiophreak on June 30, 2017, 11:06:06 PM
I tried the white market link so I could get a few of the boards.  I got an error.  What do I need to do to either get on the white market or otherwise get a few of the boards?

Thanks,

Doug

  I have a couple of these , just have the links ( jumpers) soldered in , whats your location ?
Title: Re: S800 Support Thread
Post by: NannerPuddin on July 10, 2017, 04:18:10 PM
Hey Audiophreak,

Sorry for the delay in getting back to you, I was on family vacation for a week and just now got back on the board.  I am in East Tennessee. I would love to get a couple of them if you could spare them.

Thanks,

Doug
Title: Re: S800 Support Thread
Post by: audiophreak on July 10, 2017, 04:52:01 PM
pm sent
Title: Re: S800 Support Thread
Post by: ZekeProductions on July 28, 2017, 02:05:24 PM
I've already built this EQ a while back, it definitely is a great EQ. I may want to build another one but I'm curious if anyone has built this EQ with Stepped potentiometers for both the gain and frequency. is it possible? it would definitely make recall much easier.  ;D
Title: Re: S800 Support Thread
Post by: dogfaceaudio on October 08, 2017, 05:37:19 PM
Does anyone have the dimensions for front panel holes? Or an FPD file? Thanks.
Title: Re: S800 Support Thread
Post by: brewbacca on October 09, 2017, 04:08:47 PM
I'm also wondering if anybody has an FPD or dimensions for the front panel.
Title: Re: S800 Support Thread
Post by: JW on February 21, 2018, 10:40:09 AM
Question about the cheap yellow and blue polyester caps. I have some recent kits from AML that came with Wimas. After having compared I like the yellow and blue polyesters that came with my earlier kits better. Interesting, but to my ear the bands seem to blend better.  Does anybody know exactly which series of cap these are that originally came in the AML kit? I think I read at one point that they were Dubilier type? Like these?: https://www.mouser.com/ProductDetail/Cornell-Dubilier-CDE/185103J100RAA-F?qs=sGAEpiMZZMv1cc3ydrPrF6kAfBcSzk7fYKtmY0JDDVM%3d

Or perhaps these? https://www.mouser.com/ProductDetail/Cornell-Dubilier-CDE/184333K250RBB-F?qs=sGAEpiMZZMv1cc3ydrPrF8gMTJ0uZsYN7SxNnmJTges%3d

Title: Re: S800 Support Thread
Post by: JW on February 24, 2018, 10:48:27 AM
Bump. No one knows the answer to my last question? (AML not getting back to me)

This kind of capacitor looks very similar to those found in the Soundcraft Ghost I've noticed. . . I'm gonna go researching that.
Title: Re: S800 Support Thread
Post by: Timjag on February 24, 2018, 03:18:36 PM
https://uk.rs-online.com/mobile/c/passive-components/capacitors/polyester-film-capacitors/
Title: Re: S800 Support Thread
Post by: JW on February 24, 2018, 09:40:28 PM
Hey,
Thanks for that link, but it's just to polyester films at RS UK. Not even Dubilier type? ? ? ? ? 

Good idea narrowing it down to them though because Colin did probably buy from UK for these kits? (Sheesh I don't know)
Title: Re: S800 Support Thread
Post by: ZekeProductions on April 10, 2018, 09:37:41 AM
So I had an issue with noise in my EQ and decided to pull it apart and check the wiring. Long story short I think I messed something up and went to buy another AML kit but they don't sell them anymore. Has anyone recently put the kit together from mouser or somewhere like that and share the BOM.

I also just recreated the FPD and ordered it.  So if the holes are right I may have a spare front panel for sale soon if someone wants it.
Title: Re: S800 Support Thread
Post by: ZekeProductions on June 03, 2018, 05:16:42 PM
If anyone is looking for a faceplate for this project I have an 8ch face plate for sale. PM me if you are interested.

https://groupdiy.com/index.php?topic=68967.0
Title: Re: S800 Support Thread
Post by: Le Roux on June 30, 2018, 04:17:00 PM
Wow,well done...!..

 great pics ,but my browser is having immense difficulty in loading them all..

OK I have a question about unity gain with the S800 , in unbalanced mode.. I have read this entire thread a number of times.

So..yeah we have the trimmer on board , and I've set it for unity , in a balanced situation.

Now..I rig it up in an unbalanced situation..i.e my home studio where it will live , and so I have, our old friend, the 6dB level drop.

I can readjust the trimmer for unity in unbalanced mode, but my question is if this is the best remedy , or should the trimmer be left alone , and some other resistor values be changed?

Only asking , since in other circuits like the calrec eq,input res could be changed , and the vca i/p resistors on the gssl were the best spot.

I cant find anywhere, the official word on the purpose of the trimmer; I'm assuming it's to set balanced unity/CMR...but is it ok ,or a bit crude perhaps , to use it as a 6dB compensation boost ?

any thoughts anyone?

Cheers

nEon.
Hi nEon,
looking at the schematic and leaving the trimmer (shunt in a U-pad) alone, R36 would need to be increased from 15K to 30K and compensation cap C21 decreased from 100pF to 47pF for your required +6dB unbalanced gain. Could be made switchable by paralleling a 2nd 30K and a 2nd 47pF to alter between balanced and unbalanced mode. (IMHO C21 could be kept at 47pF. The NE5532 is unitygain stable and the LPF increase from 106kHz to 225kHz for balanced operation seems safe and far enough outside the audible range to get noticed, i.e -0.034dB vs. -0.134dB tested at 20kHz). Another approach could be to measue the trimmer for the required shunt resistor values for both operation modes. Just my 2ct.
Good luck.

Is any of this necessary?
I run unbalanced and the eq sounded great. Any drawbacks from just leaving it alone running unbalanced?

Thanks
Neil
Title: Re: S800 Support Thread
Post by: fazeka on July 04, 2018, 08:42:13 PM
Hey all,

I've been trying to finish my build but I think I shorted something when the power was inadvertently left on while I was assembling it.  :( On one channel, the LF and HF doesn't seem to work. LMF and HMF boost/cut and sweep controls work. Signal at output seems low, too, even with trim max'ed out and compared with my known good working channel.

I started trying to signal trace using my 'scope from input, comparing to the known good channel. I get to pin 2 on U3 and see a signal that's not there on the known working channel pin 2 U3. The signal is slightly lower in amplitude than the input.

Any advice? I'm not versed enough to know what my next step is. Am I getting close to finding the problem given the symptoms?

Best,
Chris

(https://i.imgur.com/pgodiK3.jpg)
Title: Re: S800 Support Thread
Post by: Le Roux on July 06, 2018, 11:30:35 AM
Awesome updated schematic!! Was looking for one that I could read!! :)

I just built 8 channels, 2 of which had that issue.

Was in the wiring for the bypass switch.
One channel with a little buzz....still working on that!

Title: Re: S800 Support Thread
Post by: fazeka on July 08, 2018, 06:57:51 PM
Update: I replaced U2 and U3. Unit is now back fully functional.  ;D

However, I do have a hum/ground problem with the EQ engaged...  :( I suspect it is due to the wiring of the pots (I am not using PCB mounted pots but smallbearelectronics pots) because when I move the wiring around, the hum gets a little better/worse.

(https://i.imgur.com/TXCfGFW.jpg)

I know that the wires are longer than I'd like, but I suspect even if I were to get them shorter (as long as they need to be), I will still have hum due to varying positions they will be in, quite close to each other. No?

Otherwise, I have the unit wired up as:

I tried taking the GRD from the PCBs to the star: no improvement.  :(

Any other tips? Shielded cable from the pots to the PCBs? Something else?

Thanks,
Chris
Title: Re: S800 Support Thread
Post by: peterc on July 09, 2018, 04:35:39 AM
Hi Chris

You could try moving the toroidal transformer and see if that makes a difference.

Loosen the nut and turn it on it's axis,see if that changes.

Take the nut off and physically move the transformer around and see if the hum levels change. If that is the case, you could try  an external PSU or mount the transformer on the back of the case.
Or get some shielding for the transformer, one of our members was selling mu metal (I think)  strips for this purpose.

Here it is
https://www.don-audio.com/radiation-shielding-magnetic-shielding-tafo-hum-trafo-shielding-electro-magnetic-sheets-grain-oriented-electric-sheets-electro-magnetic-foil-shielding-foil-shielding-sheets

Regards Peter
Title: Re: S800 Support Thread
Post by: fazeka on July 10, 2018, 06:01:15 PM
Hi Peter,

Thanks for your reply. Will try what you suggest and follow-up. Thank you!

BTW, was there a chance not too long ago at a 500 series for this EQ? I thought I saw a post in this thread a few pages back, not sure if it made it to the White Market or if it did and I missed it...

Thanks,
Chris
Title: Re: S800 Support Thread
Post by: peterc on July 11, 2018, 03:59:44 AM
Hi Chris

I did make a 500 series prototype which still sits in my rack, but no more that that unfortunately
Title: Re: S800 Support Thread
Post by: fazeka on July 13, 2018, 02:29:29 AM
Update:

I took out the toroidal, flipped it around in various orientations, outside the chassis, etc. Yet I still have the hum.  :(

Seems to me that the hum is in and around the LMF and HMF, in the lower portions of the sweep (i.e., LMF ~100Hz up to about 1/3 rotation in the range, and similarly for HMF ~1k). Anyone else experience this? Is it the pots? BTW, LF and HF are quiet as a church mouse...

What would be my next step?

Chris
Title: Re: S800 Support Thread
Post by: Le Roux on July 15, 2018, 03:42:08 PM
My build

I had buzz/hum on all channels, which after a few hours of being on, disappeared?

Anyways...
Title: Re: S800 Support Thread
Post by: fazeka on July 17, 2018, 03:27:47 PM
I had buzz/hum on all channels, which after a few hours of being on, disappeared?
What's the reasoning for this? It doesn't seem possible that it can be attributed to anything with the build if it just sat there turned on and the hum just "disappeared" ?!?...

:o

For mine, I have the Small Bear Electronics (Alpha 16mm, solder terminals) pots wired up to the PCBs. When the LMF and HMF freq. sweep pots are kept away from the others, the hum goes down significantly.  :D However, when these are mounted to the front panel (i.e., within the vicinity of the other pots), the hum returns... I even tried shielded cable for these pots (telescoping the braided shield on the pot side of the cable, connected the shield on the other side of the cable to the star ground point) and no help. :( I'm really scratching my head here, it's quite maddening!  >:(

Does the hum having anything to do with these pots being dual-ganged? Or is it attributable to (that part of) the circuit? Capacitive coupling?

Chris
Title: Re: S800 Support Thread
Post by: Le Roux on July 17, 2018, 07:11:18 PM
Seriously, I had a hum/buzz on all boards outside of the case and when I installed it, was still there.

All of a sudden, it was gone!
No idea why!!! As long as it don’t come back!

I used AML parts kit.
It’s a log pot?? Or rev log?
Is small bear matching what’s required?
Only thing that comes to my mind!
I hear ya on frustration
Had a project or two I gave up on cause I can’t spend all day everyday  figuring out why it doesn’t work!
There’s music to be recorded!!

 
Title: Re: S800 Support Thread
Post by: ZekeProductions on July 21, 2018, 06:16:42 PM
What's the reasoning for this? It doesn't seem possible that it can be attributed to anything with the build if it just sat there turned on and the hum just "disappeared" ?!?...

:o

For mine, I have the Small Bear Electronics (Alpha 16mm, solder terminals) pots wired up to the PCBs. When the LMF and HMF freq. sweep pots are kept away from the others, the hum goes down significantly.  :D However, when these are mounted to the front panel (i.e., within the vicinity of the other pots), the hum returns... I even tried shielded cable for these pots (telescoping the braided shield on the pot side of the cable, connected the shield on the other side of the cable to the star ground point) and no help. :( I'm really scratching my head here, it's quite maddening!  >:(

Does the hum having anything to do with these pots being dual-ganged? Or is it attributable to (that part of) the circuit? Capacitive coupling?

Chris

Maybe if you record the sound and upload it somewhere so we can hear it and maybe someone can tell where it could be coming from. From what I've read, whether the pot is on the board or wired the issue persists and wire and shielded wire didn't make a difference.

Maybe its a grounding issue?? Does anyone know how the inputs and outputs should be wired correctly? I would love to know that because I think I may have done mine wrong. I know the power ground should go to the chassis star ground.
Title: Re: S800 Support Thread
Post by: peterc on July 22, 2018, 07:21:21 AM
HI Chris

This is a bit of a head scratcher.

What I would do next is to eliminate the long wires to the Mid pots. Desolder the wires at the PCB and add in a pair of resistors on the pads to simulate the mid position of the pot.

Is the front panel grounded? Try removing the pots from the front panel to break a possible earth loop.

What are the + and - rails looking like? Any AC or hum on them? Check with a scope for best results.

Peter
Title: Re: S800 Support Thread
Post by: fazeka on July 23, 2018, 12:43:49 AM
Maybe if you record the sound and upload it somewhere so we can hear it and maybe someone can tell where it could be coming from.
I can do that at some point. Peter has since posted something to try, so will give that a go first to see if it resolves...

From what I've read, whether the pot is on the board or wired the issue persists and wire and shielded wire didn't make a difference.
Not quite; the smallbear electronics pots can't be attached directly to board as they have solder lugs (was trying to go for a different panel layout than the stock Colin @ Audio Maintenance/Omeg pots. When the  LMF & HMF frequency sweep pots are wired to the board but kept away from (i.e., not attached to) the panel, hum/buzz is nearly non-existent. When attached to the front panel, in close proximity to the other pots, the hum/buzz is present. When EQ is switched out, there is no hum/buzz regardless if the pots are attached to the front panel or not. Shielded wire did not make a difference here.

Maybe its a grounding issue??
Surely.  ;) But I am wracking my brain trying to resolve...
Title: Re: S800 Support Thread
Post by: fazeka on July 23, 2018, 01:12:48 AM
What I would do next is to eliminate the long wires to the Mid pots. Desolder the wires at the PCB and add in a pair of resistors on the pads to simulate the mid position of the pot.
Thank very much Peter for the suggestions. What I did was remove the LMF and HMF frequency sweep pots and the hum goes away, that's why I think it's isolated to that part of the circuit. I can try the resistors...

Is the front panel grounded? Try removing the pots from the front panel to break a possible earth loop.
Using a VOM and checking front panel for continuity to star ground, I get none.

If I'm understanding you, I think I already did this essentially when I stated above that when the pots are not installed on the panel (i.e., "floating/dangling" on their wired connections to the PCB), there is virtually no hum/buzz... The one thing that is odd is that the other pots don't have this issue and they are mounted on the front panel.

What are the + and - rails looking like? Any AC or hum on them? Check with a scope for best results.
I will check and revert back.

Ultimately, what I am thinking is something in the wiring between one gang and the other on these pots is what I believe to be causing the hum. I have each of these gangs wired to the PCB as three wires, twisted. When these two groups of three wires (essentially, representing each gang) are pushed apart (I didn't twist the 3 + 3, it's getting kinda bulky/tight in there with these short lengths of wire), the hum drops down a lot. When these two groups of three wires are pushed close together, the hum goes up and is consistent with the aforementioned hum problem.

Again, is there anything specific in the circuit design that is causing this to happen? Or is it with the pots? I mean, most everyone else is using the Colin @ Audio Maintenance/Omeg pots that attach to the PCB directly so maybe explains why no one else has this hum? But I do remember a few wiring pots to the PCB and they never complained of hum... So, thinking either the issue is with these (cheap) Alpha pots or with the way I have them wired to the PCB causing some kind of coupling between the gang wiring... ??
Title: Re: S800 Support Thread
Post by: ZekeProductions on July 25, 2018, 02:17:24 PM
I had the same issue a few months back, as long as the pots weren't close together there was not an issue. I am using the omega pots from AML Kit. I thought maybe it was the pots too but before buying new pots I thought I would try different wiring. Maybe the wire i was using, so I tried shielded cable. That did not help. I also add a second mnat power board (still 1 toroid) so that 4 EQ boards go to one board and the other 4 go to another board. That didn't help.

I thought maybe my grounding was wrong (I can't remember how I had it) but I changed it to go from the mnat power to the chassis. that didn't help. Input and outputs ground goes to a terminal block to the chassis. That didn't help either.

What stopped it for a while was was when I mounted it to the front panel, it magically went away for a while. I think its back now on one channel, I might be bugging out but I thought I heard it again yesterday after reading this thread again.

I am double checking now.
Title: Re: S800 Support Thread
Post by: ZekeProductions on July 28, 2018, 02:00:54 PM
Ok so its definitely back and its in the LMF and HMF on channel 3 as it is sweepable on those pots. funny enough it only happens in bypass. When the eq is in no noise. Really odd.

Can anyone help with this?
Title: Re: S800 Support Thread
Post by: fazeka on July 28, 2018, 05:24:58 PM
Hi,

I don't suspect the problem being these pots... I think it is something about the circuit. Though, I am not very savvy in theory to explain. My best guess the noise (hum/buzz) is due to some kind of coupling...

If I could mount these LMF and HMF pots in another plane relative to the PCB and/or the other potentiometers, I'd be done as there is no (or very greatly diminished) noise (hum/buzz) upon doing so, as I stated earlier. Of course, this is not practical as it would mean having these controls accessible via the top or sides of the unit which, needless to say, complicates their usage in a rack-mountable device! ;D

It is odd that you are encountering noise/hum/buzz with these when the EQ is switched out. I would suspect the issue would only arise with the EQ engaged... I don't mean to offend but are you certain the in/out switch is wired correctly?

Cheers!
Chris
Title: Re: S800 Support Thread
Post by: ZekeProductions on July 31, 2018, 02:11:30 PM
Hi,

I don't suspect the problem being these pots... I think it is something about the circuit. Though, I am not very savvy in theory to explain. My best guess the noise (hum/buzz) is due to some kind of coupling...

If I could mount these LMF and HMF pots in another plane relative to the PCB and/or the other potentiometers, I'd be done as there is no (or very greatly diminished) noise (hum/buzz) upon doing so, as I stated earlier. Of course, this is not practical as it would mean having these controls accessible via the top or sides of the unit which, needless to say, complicates their usage in a rack-mountable device! ;D

It is odd that you are encountering noise/hum/buzz with these when the EQ is switched out. I would suspect the issue would only arise with the EQ engaged... I don't mean to offend but are you certain the in/out switch is wired correctly?

Cheers!
Chris

No offense taken, 100% with you that this could be user error from my end as I'm not an expert builder (I do things well but not an expert )  but the bypass is definitely wired correctly. when it is engaged I can eq any signal that goes to that channel. a little goes a long way with this thing.  I'm going to look at the diagram again and see if I can figure out what components are dedicated to the LMF and HMF.


On a side note  - Does anyone have a mouser bom they can share with me? I have a few spare boards that I am thinking of building to test and see if I get the same issue. maybe even replace the ones I have issues with.
Title: Re: S800 Support Thread
Post by: JW on September 16, 2018, 02:59:48 PM
Question 1. (edit: never mind)

Question 2. If wiring up multiple boards, does each board's signal ground need to make a homerun back to the power supply ground, or can we daisy chain them together and then to the power supply ground?