S800 Support Thread

[mrphotodude]

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
PS=470uf@35v electrolytic
PCB=100uf electrolytic with round space and polarity marker

C26
SCH=100uf@25v
PS=100uf@25v
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

 

[peterc]

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 : PS=470uf@35v elec : PCB=100uf electrolytic with round space and polarity marker

>>C26 : SCH=100uf@25v elec : PS=100uf@25v : 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

Peter

 

[Holger]

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:

 

[brother303]

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:

 

[okgb]

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

 

[Lowfreq]

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.

 

[peterc]

Please see second post for errata.

Peter

 

[brother303]

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:

 

[stitch-o]

[quote author="brother303"]The schems say 18V,[/quote]
If I might ask a question::
Where might those schems be located?

This toroidal should do the trick?

Cheers!

 

[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

 

[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?

 

[stitch-o]

[quote author="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[/quote]
Perfect-o

Cheers!

 

[3nity]

Antek stuff dont fit a 1U rack.

 

[Brolik]

Peter, are those transformers you mentioned big enough for the 8 channel or are they for the 2 channel version?

 

[peterc]

I would use a 50VA part for an 8 channel unit

Peter

 

[mrphotodude]

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?

 

[Brolik]

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.

 

[Benny]

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:

 

[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

 

[Holger]

[quote author="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[/quote]

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.