GroupDIY

Project Specific Discussions => Filters/Equalizers => Topic started by: Igor on September 13, 2011, 05:36:39 PM

Title: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on September 13, 2011, 05:36:39 PM
Here is the support thread for He-69, Helios inspired EQ.

For now, I tested the PCB's for 500/51X version, they will be available at my store
within a hour from now; rack version PCB will be available very soon.
Rackit! can be used for testing/racking this (and many others) 500/51X projects:

http://www.groupdiy.com/index.php?topic=45678.0

500/51X:

(http://i251.photobucket.com/albums/gg291/diy33609/51x_ver.jpg)

Rack version (2 channels can fit in 1RU):

(http://i251.photobucket.com/albums/gg291/diy33609/rack_ver.jpg)

Front view:

(http://i251.photobucket.com/albums/gg291/diy33609/P1060618.jpg)

Transformer version:

(http://i251.photobucket.com/albums/gg291/diy33609/P1060616.jpg)

Transformerless version:

(http://i251.photobucket.com/albums/gg291/diy33609/P1060615.jpg)

Please, download documentation and meditate to files at least 30 minutes ;)

http://ij-audio.com/downloads/HE_69.rar

PCB set is as usual, high quality, Israeli made.

Kit contains: PCB set, black Aluminum anodized, machined/engraved front,  bracket, inductors, mounting hardware, DOA sockets.

Please note, we will be able to ship the kits after Sept 28th (we almost out of brackets and ordered new batch;
it should be ready at Sept 26th).
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on September 13, 2011, 05:37:05 PM
RESERVED :)
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Dubka on September 22, 2011, 06:20:25 PM
Mate, where are these knobs from?
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on September 23, 2011, 09:04:16 PM
The knobs are ELMA.
In Israel, they are available from local distributor (MOQ = 100+); in small quantities,
these knobs, usually in black, are available from Farnell.
10mm wing knob, 10mm knob, grey, without line, + black skirt with line, + black cap with line; 3.15mm shaft.

The great advantage of these knobs is they are available in sizes 9...45mm for every possible shaft,
can be stacked for concentric pots, can be used with skirt/pointer, etc. Excellent quality BTW.

http://il.farnell.com/jsp/search/browse.jsp?N=2017+202401&Ntk=gensearch&Ntt=elma+knob&Ntx=mode+matchallpartial
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Grummy77 on October 21, 2011, 08:11:51 PM
Anyone build this yet? I'm thinking of pulling the trigger as I am in need of some hardawre eq. Doesn't look like it'd be too difficult of a build.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on November 07, 2011, 04:24:09 AM
I built 8 of these EQ's at the moment. It is way more simple than 90% of my other projects.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Grummy77 on November 07, 2011, 07:52:54 AM
I built 8 of these EQ's at the moment. It is way more simple than 90% of my other projects.

Care to share your thoughts on the plus and minuses of the transformer vs the transformerless versions? I noticed your store on diyrecordingequipment no longer is offering the partial kit anymore. Will you be selling partial kits for these again?

Cheers.
Aaron
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on November 07, 2011, 10:35:13 AM
The store is updated, kits are in stock. Thoughts...... Transformers = lows and low-mid saturation, some phase shift on highs;
generally, more iron is more 3rd harmonic (but it is shifted by 90 deg to sound in opposite to say PP circuits)....mmmm....dunno)
Last time I more and more tending to clean sound with bit of second harmonic. Too much distorting Iron is long time ago out of my style.
However, the combination which I liked very much sound-wise is LL1524 and balanced line receiver.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Grummy77 on November 07, 2011, 12:12:56 PM
Thanks for the reply. I'll be getting a couple at some point, hopefully sooner rather than later. Glad to hear the kits are back. ;D

Cheers.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ruffrecords on November 07, 2011, 12:16:29 PM
On the mid section front panel layout I think the switch should have PK above and TR below (for trough) - not TH.

Cheers

Ian
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on November 08, 2011, 11:58:58 AM
Thanks for the reply. I'll be getting a couple at some point, hopefully sooner rather than later. Glad to hear the kits are back. ;D

Cheers.


Mm. Yep. Welcome :)
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on November 08, 2011, 11:59:38 AM
On the mid section front panel layout I think the switch should have PK above and TR below (for trough) - not TH.

Cheers

Ian

Thanx Ian! Will fix for the next batch.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: jandoste on November 18, 2011, 04:19:17 PM
Hey Guys,
If you have any TBD link on mouser or Farnell link  I'll be very happy guy:)! sorry about my newbie question  :o
1   TBD   C10                                 
5   TBD   MF 1/4W 1%         R10, R12, R13, R14, R15

Thanks
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: zayance on November 18, 2011, 05:01:00 PM
Hey Guys,
If you have any TBD link on mouser or Farnell link  I'll be very happy guy:)! sorry about my newbie question  :o
1   TBD   C10                                 
5   TBD   MF 1/4W 1%         R10, R12, R13, R14, R15

Thanks

TBD: To Be Determined  :-)

Zobel network maybe? Don't have the schemo in front of me...
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: jandoste on November 18, 2011, 05:05:44 PM
Hey Guys,
If you have any TBD link on mouser or Farnell link  I'll be very happy guy:)! sorry about my newbie question  :o
1   TBD   C10                                 
5   TBD   MF 1/4W 1%         R10, R12, R13, R14, R15

Thanks

TBD: To Be Determined  :-)

Zobel network maybe? Don't have the schemo in front of me...

Thanks Zayance
TBD: To Be Determined   :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :) :)
cheers,
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: jandoste on November 22, 2011, 04:48:55 AM
Hey Igor,
Please can you tell me if 9048 is on right position?
Thanks
(http://i1236.photobucket.com/albums/ff442/jandoste/photo-4.jpg)
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: jandoste on November 23, 2011, 05:41:09 PM
Hey Guys,
I think Igor will back here in two months  ;D so if you have any idea that can I use 608pF instead of 506pF? [ CH5 and CM1 ]
Thanks for any advance!
cheees,
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on December 01, 2011, 05:31:20 PM
Here. Took less than a year!!! Woa!!!!!
:)
680/560 pf. Mmm.... I'd use 5% values for all, but there is another way, connect 2 capacitors in parallel....
Cay 560 pf is 220 || 330 pf.... (roughly)

Carenhills. On back side of PCB printed inductor values at each pin. I don't have schem at this comp.
If not found, drop a line, will check and post. However, don't give a fish, but teach fishing:
Inductor datasheet and schematic/pcb!!!
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: jandoste on January 14, 2012, 07:35:22 PM
Hey Igor,
I really can't understand that what I need to use for R12 and R15?

OUTPUT TRANSFORMER     T1   
1   LL1524(1517) 1:1 OR  1:2 CAN BE USED;
for 1:2 output transformer, r12/r15 should have relation 25/5.1, for example, r12=24k9/r15=5k1,
depending on which impedances your amp wants to see; for amp used with f76, i used 2k49 and 511r;
for 1:1 output transformer or transformerless,
[/size] r12/r15=50:5.1 That what I used

and also you are saying here,

1   TBD   POLY/COG 22...330 PF 50...200V   C7   
DEPENDING ON FEEDBACK RESISTOR'S VALUES AND AMP; 22PF WITH
R12=47K, 330PF WITH R12=2K5

next question is about R17! Can I use 51R ?



Thanks

Regards


Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on January 17, 2012, 10:41:41 AM
Quote
Hey Igor,
I really can't understand that what I need to use for R12 and R15?

OUTPUT TRANSFORMER T1
1 LL1524(1517) 1:1 OR 1:2 CAN BE USED;
for 1:2 output transformer, r12/r15 should have relation 25/5.1, for example, r12=24k9/r15=5k1,
depending on which impedances your amp wants to see; for amp used with f76, i used 2k49 and 511r;
for 1:1 output transformer or transformerless,[/size] r12/r15=50:5.1 That what I used

and also you are saying here,

1 TBD POLY/COG 22...330 PF 50...200V C7
DEPENDING ON FEEDBACK RESISTOR'S VALUES AND AMP; 22PF WITH R12=47K, 330PF WITH R12=2K5

last question is about R17! Can I use 51R ?

Mm... OK!
Don't give a fish, but give a fishing tutorial ;)
http://ij-audio.com/downloads/HE_69.rar
File:
SCHEM_PS_IO_RELAYS.png
r17 depends on relays coil resistance. Mine are 200R; yours can be different.
Take one relay, measure the coil resistance with ohmmeter, all calculations are shown on schemo/datasheet.
The voltage on each relay should be 5V, and voltage on r17 should be 1.25V. The rest is Ohm's law.

In case of use 1:1 output transformer, use 4k99, about 200pf (+/-30% is fine), and 511R.
What transformer and discrete op-amps are used?

50K low-boost resistor. See the picture. Tie 3 pins together. Connect free pins.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: jandoste on January 17, 2012, 12:09:19 PM
Thanks Igor!
I use ll1524-l7101 and gar1731 that I used...

PS: We will fishing and driking french wine in haifa together :) don't forget it!  ::)

EDIT: gar1731 won't work with 24V...
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: jandoste on January 19, 2012, 01:31:39 PM
Hey Igor,
I just want to be sure how and where can I place the small pins in their locations? [switch  12 position]
any idea? ::) ::) ::) ::)


regards
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: zayance on January 19, 2012, 07:14:41 PM
Hey Jandoste, did you order the one seen on pic? That's a 2 Deck 2 Pole, we need a 2 deck 1 Pole here :/

As for the stop pins, the instructions of this are in the Grayhill tube, the principle is when having the Deck pins laying flat on table,
and the pot axis at a given position (shown on instructions), you insert the first pin and the last for the last position,
number of position is written on the back of the Grayhill, simple as that...
Use resistor legs a little long to try it out and see if you get the point.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: jandoste on January 19, 2012, 07:44:54 PM
Hey Jandoste, did you order the one seen on pic? That's a 2 Deck 2 Pole, we need a 2 deck 1 Pole here :/

As for the stop pins, the instructions of this are in the Grayhill tube, the principle is when having the Deck pins laying flat on table,
and the pot axis at a given position (shown on instructions), you insert the first pin and the last for the last position,
number of position is written on the back of the Grayhill, simple as that...
Use resistor legs a little long to try it out and see if you get the point.

Hey Zayance,
I didn't order this one:) I got the deck from digikey ::) awesome!
I was searching a picture for posting here that I found :D it on google:)
Ok, I understand how I need to drop the pins   ::)
Thanks Thanks Thanks
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: jandoste on January 23, 2012, 05:58:55 PM
Hey Igor,
1- Do I need to cut pins 17/18 of card edge connector?
a- I would like use -/+24V in the furture! so can I just jump jp1/jp 2 instead of cutting pins 17/18?
b- But I use -/+16 V for the moment! PSU out is ok! so I got -/+ 16V and when I connect PSU to the board than R1/R2/R3/R6 are smoking :( ? do you have any idea?
3-On the rackit; What I need to do with three pins: Outs G and insG? and the Link conncetion must be connected how?

Thanks!
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on January 23, 2012, 06:28:41 PM
Fishing in polluted sea in Haifa.... NO!!!! On the north of Israel there are few small rivers dedicated for fishing, same, not best fun.
But for sure, some good pubs, YES!!!!!!
Attached is the stoppin picture, copy pasted from F-76 ;)

Quote
Hey Igor,
1- Do I need to cut pins 17/18 of card edge connector?

No

Quote
a- I would like use -/+24V in the furture! so can I just jump jp1/jp 2 instead of cutting pins 17/18?

He, yep. Just tell to people you using API opamps on +/-16V, it is bit different! Yes, in this case, jump +16 to +24; same jump -16 to -24,
use ONLY +/-16V power supply AND DO NOT INSTALL ANY REGULATORS (317/337) on Rackit!!!!!!

+/-16V power supply should be connected to +/-24V rails of rackit.

In future, if you like to change it to 51X format: remove all +/-16V discrete opamps;
balanced line receiver feed from +/-16 anyway; put +/-24V opamps, 317/337 to rackit, DISCONNECT 16 and 24V rails, feed +/-24V supply to +/-24V rails of rackit.

Quote
b- But I use -/+16 V for the moment! PSU out is ok! so I got -/+ 16V and when I connect PSU to the board than R1/R2/R3/R6 are smoking :( ? do you have any idea?

Remove op-amps, all IC's, recheck; this way we can know if the prob is reversed power supply cap, short or discrete opamps.

Quote
3-On the rackit; What I need to do with three pins: Outs G and insG? and the Link conncetion must be connected how?

OUTG and INPG are pins 1 of XLR's. Depending on grounding scheme, tie them to agnd (circuit analog ground) or case.
For me, agnd worked best.

LINK - do nothing, it used for compressors only to tie detectors together.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: jandoste on January 29, 2012, 07:23:22 AM
Thanks for reply!
bumped on Facebook!
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: jandoste on January 30, 2012, 04:58:53 AM
Igor,
Bumped on Fcebook and I can't find you anymore :).... and I feel that I'm alone for building this HLS! I told you my problem on Facebook!So what I mean you already knew it !
I didn't understand 50K Lin boost pot! the pic is right?
(http://i1236.photobucket.com/albums/ff442/jandoste/P1060575.jpg)
Thanks
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on February 02, 2012, 11:34:44 PM
Igor,
Bumped on Fcebook and I can't find you anymore :).... and I feel that I'm alone for building this HLS! I told you my problem on Facebook!So what I mean you already knew it !
I didn't understand 50K Lin boost pot! the pic is right?
(http://i1236.photobucket.com/albums/ff442/jandoste/P1060575.jpg)
Thanks

Answered on Facebook ;)

DUAL power supply. The picture is right.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Axelerator on February 09, 2012, 03:02:31 PM
Hi igor
Having your nice boards here now
getting slowly sorted i would like you to "nail it down" for me/ us plz..
you liked most the only output tranny version , there did you like 1:2 or 1:1 more ?
how was the original amp driven ?
I would use 24v 511x version with the Helios amp
..
suggested values for  the TBD  ? ::) ;D
electronic knowlegde is just getting more very slowly here...
greets
axel
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: StudioSQ on February 10, 2012, 11:28:17 PM
Where are the engraved front panels available?
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Axelerator on February 17, 2012, 08:55:08 AM
ugh getting confused about those grayhills, in the bom DIGIKEY  GH7326-ND is suggested  for beeing a
71ADF30-01-1-AJS  GRAYHILL ROTARY SWITCH 1X12
but on their side this number is linked with the 71ADF30-01PAJN switch.
they have the    71ADF30-01PAJS-ND but with another Digi - number..
so as they are quite costy for 4 eqs ;D
i would like to be ceartain which one to use...
..or doesnt matter ?
thanks as always,
axel
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Axelerator on February 20, 2012, 05:52:19 AM
plz...
bump !
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: zayance on February 20, 2012, 09:10:20 AM
ugh getting confused about those grayhills, in the bom DIGIKEY  GH7326-ND is suggested  for beeing a
71ADF30-01-1-AJS  GRAYHILL ROTARY SWITCH 1X12
but on their side this number is linked with the 71ADF30-01PAJN switch.
they have the    71ADF30-01PAJS-ND but with another Digi - number..
so as they are quite costy for 4 eqs ;D
i would like to be ceartain which one to use...
..or doesnt matter ?
thanks as always,
axel

The one that confuses you, is not available anyhow so...

The ones that you need:

http://search.digikey.com/scripts/DkSearch/dksus.dll?x=24&y=12&lang=en&site=us&KeyWords=GH7328-ND

http://search.digikey.com/scripts/DkSearch/dksus.dll?x=26&y=10&lang=en&site=us&KeyWords=GH7326-ND
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Axelerator on February 20, 2012, 11:19:48 AM
 :) many thanks !
so i can finaly start

axel
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: oceres on February 21, 2012, 01:12:38 AM
Interested in this EQ for the 51X rack. I loved the mids very much when I had the UAD-1 Type 69. True story, I jumped up out of my chair when I heard it the first time on electric guitar. That had never happened before or since regarding anything audio related.  :o

Good luck on your builds!
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on February 27, 2012, 02:51:51 PM
Hi igor
Having your nice boards here now
getting slowly sorted i would like you to "nail it down" for me/ us plz..
you liked most the only output tranny version , there did you like 1:2 or 1:1 more ?
how was the original amp driven ?
I would use 24v 511x version with the Helios amp
..
suggested values for  the TBD  ? ::) ;D
electronic knowlegde is just getting more very slowly here...
greets
axel


Hi Axel!

Possible to use 2:1 balanced line receiver and 1:2 out trafo, etc.

TBD's: see the schemo and BOM. In general, mekeup amp should have feedback res' with relation 2500:511
to bring the signal after passive eq to unity gain. Values depending on which impedances amp prefer to see,
mine stage (used in 51X-F76) prefer low impedance - 2k5:511R, "original" amp prefer higher impedance - say 49k9:1k2.

R17 - resistor which sets the current for relays - see schemo, all calculations are here.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on February 27, 2012, 02:53:11 PM
Where are the engraved front panels available?

Mm... At the store, with kits, or just mail/skype/facebook.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on February 27, 2012, 02:56:20 PM
ugh getting confused about those grayhills, in the bom DIGIKEY  GH7326-ND is suggested  for beeing a
71ADF30-01-1-AJS  GRAYHILL ROTARY SWITCH 1X12
but on their side this number is linked with the 71ADF30-01PAJN switch.
they have the    71ADF30-01PAJS-ND but with another Digi - number..
so as they are quite costy for 4 eqs ;D
i would like to be ceartain which one to use...
..or doesnt matter ?
thanks as always,
axel

The one that confuses you, is not available anyhow so...

The ones that you need:

http://search.digikey.com/scripts/DkSearch/dksus.dll?x=24&y=12&lang=en&site=us&KeyWords=GH7328-ND

http://search.digikey.com/scripts/DkSearch/dksus.dll?x=26&y=10&lang=en&site=us&KeyWords=GH7326-ND

Agree ;)

Interested in this EQ for the 51X rack. I loved the mids very much when I had the UAD-1 Type 69. True story, I jumped up out of my chair when I heard it the first time on electric guitar. That had never happened before or since regarding anything audio related.  :o

Good luck on your builds!

It IS already done for 51X format. If need built unit - consider, I am overloaded with work already for 2 month, but...possible!
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: oceres on February 28, 2012, 01:55:51 AM
Quote from: Igor

It IS already done for 51X format. If need built unit - consider, I am overloaded with work already for 2 month, but...possible!

Yes the HE69-51X is known, thanks! Will probably be the next DIY project here when the chance arrives. I've my mind on the transformerless version.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on February 29, 2012, 08:52:05 AM
Mm. Yep. Welcome to DIY EQ land!
:)
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: jandoste on February 29, 2012, 01:29:13 PM
Hey Guys,
Did you try John Hardy 990c opams for this project?
Cheers
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: StudioSQ on February 29, 2012, 01:31:32 PM
I actually ordered the kit and it came without a front panel. Is is on the way in another shipment?
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on February 29, 2012, 02:18:35 PM
IMO, 990C should work, but better to run them at +/-16V.
Front panel: should come with kit. We had an overload with work, and, maybe, my assistant
forgot to ship it. Happens, human factor. Just let us fix it.
If something is missing: please mail me to igor_jazz at yahoo, will send ASAP.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: jandoste on February 29, 2012, 04:41:55 PM
IMO, 990C should work, but better to run them at +/-16V.
Thanks Igor:) you told me that and had your great support on FB! just I wanted to know if someone already tried it...John hardy wrote me that 990C must work but I am not sure that is right :(
Anyway :) I am waiting my new op-amps :)
Cheers
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: StudioSQ on February 29, 2012, 05:30:49 PM
Just sent you an email abouy the pannels, thanks
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: nielsk on March 11, 2012, 05:20:28 PM
Since the HE opamp board was not included I guess I'll be sticking a 2520 in there, what are the TBD values for this?
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Grummy77 on March 12, 2012, 08:16:10 PM

Hi Igor.

I was hoping you could offer a little more info or guidance on the procedure to make the Transformer-less version. Forgive my lack of knowledge and understanding. I consider myself learning. 

I think I've been able to wrap my head around the differences in the input options from the documentation but I'm still a bit hazy on how I would implement the transformer-less output section. In the photos you supplied there seems to be a small PCB with what appears to be a DIP8 IC opamp in place of the LL1524. Is this something you offer separately? Is it needed for the tranny-less output option?

Basically the only detail I understand about the tranny-less output option is to add a resistor between TR+ & TR+2, and TR- & TR-2. I can't seem to find any onfo about that little PCB (in place of the output Tranny) in your tranny-less picture.

Any incite appreciated.
Cheers.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: nielsk on March 14, 2012, 01:28:39 PM
Bump?
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: nielsk on March 15, 2012, 10:08:00 PM
Where does the other switch go and what does it do?
What is the deal with the Bypass 1,2 & 3 pads?
Any support at all on this thing would be appreciated.....
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ruffrecords on March 17, 2012, 06:08:13 AM
The knobs are ELMA.
In Israel, they are available from local distributor (MOQ = 100+); in small quantities,
these knobs, usually in black, are available from Farnell.
10mm wing knob, 10mm knob, grey, without line, + black skirt with line, + black cap with line; 3.15mm shaft.

The great advantage of these knobs is they are available in sizes 9...45mm for every possible shaft,
can be stacked for concentric pots, can be used with skirt/pointer, etc. Excellent quality BTW.

http://il.farnell.com/jsp/search/browse.jsp?N=2017+202401&Ntk=gensearch&Ntt=elma+knob&Ntx=mode+matchallpartial

Hi Igor. I cannot see the 10mm wing knob at Farnell. There's a 14.5mm black one and a 21mm grey one. Which size did you use for this project?

Cheers

Ian
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: zayance on March 18, 2012, 06:36:31 PM
The knobs are ELMA.
In Israel, they are available from local distributor (MOQ = 100+); in small quantities,
these knobs, usually in black, are available from Farnell.
10mm wing knob, 10mm knob, grey, without line, + black skirt with line, + black cap with line; 3.15mm shaft.

The great advantage of these knobs is they are available in sizes 9...45mm for every possible shaft,
can be stacked for concentric pots, can be used with skirt/pointer, etc. Excellent quality BTW.

http://il.farnell.com/jsp/search/browse.jsp?N=2017+202401&Ntk=gensearch&Ntt=elma+knob&Ntx=mode+matchallpartial

Hi Igor. I cannot see the 10mm wing knob at Farnell. There's a 14.5mm black one and a 21mm grey one. Which size did you use for this project?

Cheers

Ian

10mm ones

Drop him a line:
https://sites.google.com/site/diypartsstore/catalog/catalog-page-2
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ruffrecords on March 19, 2012, 04:31:35 PM
The knobs are ELMA.
In Israel, they are available from local distributor (MOQ = 100+); in small quantities,
these knobs, usually in black, are available from Farnell.
10mm wing knob, 10mm knob, grey, without line, + black skirt with line, + black cap with line; 3.15mm shaft.

The great advantage of these knobs is they are available in sizes 9...45mm for every possible shaft,
can be stacked for concentric pots, can be used with skirt/pointer, etc. Excellent quality BTW.

http://il.farnell.com/jsp/search/browse.jsp?N=2017+202401&Ntk=gensearch&Ntt=elma+knob&Ntx=mode+matchallpartial

Hi Igor. I cannot see the 10mm wing knob at Farnell. There's a 14.5mm black one and a 21mm grey one. Which size did you use for this project?

Cheers

Ian

10mm ones

Drop him a line:
https://sites.google.com/site/diypartsstore/catalog/catalog-page-2

Thanks for the tip.

Cheers

Ian
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: nielsk on March 22, 2012, 08:27:11 AM
Any       support    at   all??????
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Grummy77 on March 22, 2012, 02:40:51 PM
I've noticed on Igor's threads that he kinda comes and go's. It seems like he'll pop in when he's got time and answer a bunch of questions all at once. I'm guessing he's just busy right now.

This is one of his newer PCB's so I'm guessing that there aren't too many others that have experience with it. If there were we'd probably get some more discussion happening and end up answering our own questions.

Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Grummy77 on March 22, 2012, 03:06:54 PM

I'll offer what little advise I can guess at until Igor returns. (keep in mind I'm pretty new to DIY)

nielsk - 2520 - Not sure about your TBD values for dropping a 2520 op-amp in. But if you're building the +-16v version you should have no problem using a 2520.

In my partial kits (I bought 2) I received a pair of Op Amp PCB's that I put together (I've yet to test them yet). Just in case I also purchased a pair of ML918 kits from Whistlerock http://www.whistlerockaudio.com/cart/index.php?main_page=product_info&cPath=35_39&products_id=106
and when building them I made the three resistor substitution to optimize them for +-24v. I did this because I plan to build the 51x version and run them off of 24v
Otherwise I've got some red dots, GAR2520s, and GAR1731s from CAPI that I could have used.

- Switch & bypass1,2,& 3. I could be wrong, but from what I can tell the Bypass (& preamp integration) switch connects to those three bypass pins. It looks like in the photos that Igor runs the wires and solders them from the backside of the PCB.

That's what I seem to gather anyway.


Unfortunately I'm still confused as to what the little PCB is in the outpu ;Dt tranny hole on the transformer-less version pics and whether I need whatever it is :P. Oh well I think I might just wait until I can afford the two Lundahl's. I seem to think I have a grasp on that option. Plus having some tranny's in there feels a little more bad ass.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: nielsk on March 23, 2012, 08:15:07 AM
Thanks for you reply, Grummy... so it looks like I should have received the op amp board then.
I would sort of figure that, as the op amp would be a big part of what makes this different from all the other LCR eqs...
The pics in the download clearly show the pk/th switch wiring from every angle imaginable, but I find nothing concerning the xlr}ins switch. No explanation of what this is or how it is supposed to work & be wired.
Like most I want a bypass switch, if this can be configured as such I need information, as with these black PCBs w/ ground planes, I can't trace anything out.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on April 04, 2012, 07:43:55 AM
Since the HE opamp board was not included I guess I'll be sticking a 2520 in there, what are the TBD values for this?

Please check the BOM and documentation. For 2520, use feedback resistors 25K/5k1.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on April 04, 2012, 07:52:38 AM
Thanks for you reply, Grummy... so it looks like I should have received the op amp board then.
I would sort of figure that, as the op amp would be a big part of what makes this different from all the other LCR eqs...
The pics in the download clearly show the pk/th switch wiring from every angle imaginable, but I find nothing concerning the xlr}ins switch. No explanation of what this is or how it is supposed to work & be wired.
Like most I want a bypass switch, if this can be configured as such I need information, as with these black PCBs w/ ground planes, I can't trace anything out.

You can figure thois out easy from schemo.
For use with xlr/ins/byp option, switch is SPDT ON-OFF-ON toggle.
Center of switch connected to 2.
In mid position, all relays are energized.
When BYP1/2 relays are not energised (/BYP1, /BYP2 points are connected), it is bypass.

Any       support    at   all??????

Hm. All questions you asked is just a matter of some minutes to stare into schematics and meditate ;)

Forum topics actually take a lot of my time, it is like understand what happened, check with the schemo, etc.
If I am busy with my stuff - sorry. I checking the threads couple of times every week, so...
if this is the matter of hardcore troubleshooting, I answer as soon as I can,
the questions like see the bom/schemo are left for when I have a free time.

Example. Let's assume we not boost/cut anything.
Than, signal drop path is r21(22k) to (r22(5k1) in parallel to mid cut (25k)), or mid boost(25k) to r22,
so, we need 25->5.1 feedback resistors coefficients to restore to unity gain.

See the schemos where 2520 used and you find that 25k/5k1 is good point to start with. Etc. ;)

BTW, strange, we included the "original" amp boards with kits.
One of duded told he have not received it or lost when unpacking, so, we resent.
So, if this happened with you too, just drop me an email, will send the He amp board, of course, no charge for this.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: nielsk on April 07, 2012, 07:13:12 PM
Thanks for the reply.
Bear in mind that it makes perfect sense to you because you designed it, and have looked at it probably hundreds of times.
The schematics are on multiple sheets, instead of one complete drawing, so it is a challenge to visualize the complete signal path. The relays are using an unusual  scheme. As this is set up to be used different ways and using non-standard nomenclature, it presents challenges to someone seeing it the 1st time.
I think we can all benefit by keeping this perspective in mind. It's just a simple EQ, but it is presented with so many options that a few simple instructions would go a long way.
I will email about the op amp board.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on April 30, 2012, 07:40:06 PM
The boards sent within a week after your request.
Mm.. well, visualize... better to say, I feel schematics as chess play, billiard, strategy, whatever, when I offer DIY projects, I not always have tones of time to make best readable documentation and expect people understand it; 20 minutes of meditation with schemo is enough IMO to get catch what's going on here. Every my project which have more than 1.2 revision was built and checked at least 2 times by me and the docs were checked twice at least and readable for me. Anyway, will keep this in mind and do my best to describe all possible stuff in docs. For last month, I abandoned support threads by simple reason - have no time. Well, will have a free week soon!
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Grummy77 on May 23, 2012, 09:04:55 AM
Yesterday I went from being super pumped to super disappointment. I got a pair of LL1517 trannies in the mail. They were the last piece of the puzzle for my two he69 builds. As far as I could tell I had two complete he69's with THAT1246 inputs and the transformer output option.  ;D  They both pass audio well.

But that's where the good times stop rolling  :-[. I can't seem to get the EQ love. It's as though they are locked in bypass. I can hear at least one relay switching when I flick the from XLR-Bypass-INS. However byp & XLR seem to both be bypassing the EQ section. INS doesn't pass audio (but that I expected since I don't have a pre connected there).

Igor or anyone else have suggestions of where I should start troubleshooting first. Perhaps I mis-wired the bypass switch? or am using the wrong relays?

Cheers.  :P
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Grummy77 on May 23, 2012, 08:37:44 PM

After reviewing the schematics and testing I came to the conclusion that the centre pin on the bypass switch should be connected to [byp#1]. it seems to be switching correctly. Unfortunately when not in bypass the audio doesn't seem to make it past my ll1517. Using a scope I was able to trace a sine wave to the opamp output just before the ll1517. I wonder what I screwed up there.

Hoping I won't need to pull out the transformers cause I imagine that to be real fun like.  :-\
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Grummy77 on May 23, 2012, 08:52:24 PM
Imma F#@&ing moron!!!  :o

Totally installed the ll1517's upside down. The label on them is basically upside down compared to the ll1724's. I need to pay more attention when I do this stuff. I was pretty careful the entire process. I think I just got too excited at the idea of getting to finally finish and hear.

That's what I get. Yeesh.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: zayance on May 24, 2012, 06:39:35 AM
Oh good that you manifested yourself, tottaly forgot to warn people here.
The relays part number Igor wrote on his BOM (farnell code) seems to not be a good one, has a relase voltage of -3V.
I told Igor, but too busy as always so.....
Better go for 12V relay options and check datasheet to make sure release voltage is a positive one, because most 5V Relays with Coil resistance over 200ohms will have this same spec. from what i found out.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Axelerator on June 13, 2012, 11:12:13 AM
hi together, just want to ask for some opinions for my eq´s still on the bench (being quite a chess newb after all this years..!)
anybody has theirs working ?
sounds how with helios to maybe 2520 style ?
..as i have 4 set´s i thought maybe try two different drivers for my lundahl outs...
axel
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Grummy77 on June 13, 2012, 01:11:52 PM
anybody has theirs working ?
sounds how with helios to maybe 2520 style ?

I've "sort of" got a pair working over here. I'm pretty sure I've made some errors along the way. I'm basically the poster child for how to not take your time and have patience. I was pretty careful up until I figured I was almost done. Then the anticipation got the better of me. The two I made have the THAT line driver input and the Lundahl output. So far I've just been using Igors Opamp. I do have a pair of Whistle Rock 918's that have been optimized to run off +-24v I do have some GAR2520's, GAR1731's but I don't want to fry or shorten their life running them on +-24v. I have a movie and a first season of a new TV show on my plate right now so I don't have the time to do my needed troubleshooting. Although I have some issues. I effing LOVE them so far. So quick to dial in. They almost take the skill out of EQing. I usually don't track through EQ but I do with these now for certain sources. voice & acoustic guitar. When I get a chance to compare the OpAmps I have here I'll post. Might be a smart Idea for me to work out what my issues are first though.

My first issue which isn't as huge of a deal is they have very little headroom compared to the rest of my gear. I need to take signal down below -20 or I hear audible distortion (although I've had some success with a little of this distortion already). It is possible that this is normal I s'pose.

The other issue I have is in the bottom end. No matter what the settings there seems to be a permanent 50hz Low cut filter happening. It's a very smooth cut but It will prevent me from being able to use it on a drum bus, or mix bus. Other than those two issues it seems to behave as should. I compared with some of the Helios Type 69 graphs I've seen on line here and it seems to be doing comparable things (outside of my permanent 50Hz cut)  :-\

That said I almost don't want to change it. As it has become my favorite vocal sweetener. Especially for BG vocals & BG vocal bus. So quick to dial in. Also when running it a tiny bit hot the distortion it adds is kinda rad.  ;D

My deadlines end in September, so I can get back to messing around with this stuff then.

Cheers.

Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Axelerator on June 16, 2012, 07:04:45 AM
ok thanks for your informative answer here...
maybe i will go with some +/- 24volt opamps , i will use the eq´s mainly for tracking my synths and drummachines which have quite loud outs around +4 db.
hmm... anybody else with the 50 hz cut issues ?
there are frequencies below i really like in electronic music..!! ;)
greets
axel
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: nielsk on June 18, 2012, 11:43:37 AM
Getting close to firing this up, what is R15 w/ HE amp?
How about R1A & R2A?
Using TX-2 12 volt relays, I have 50 ohms in R17...
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Grummy77 on June 18, 2012, 09:12:45 PM
Getting close to firing this up, what is R15 w/ HE amp?
How about R1A & R2A?
Using TX-2 12 volt relays, I have 50 ohms in R17...

R15 - Off the top of my head I can't remember (plus who knows if I even did it right? :P)
I think Igor has the info for that in his BOM doc. according to his BOM it's dependent on what output transformer (or weather you're using one). I believe you need to have a ratio with R12. So you need to figure out both R12 and R15 together.

R17 - Is dependant on what Relay's you are using. The info on how and the formula for that is in Igor's "SCHEM_PS_RELAYS" document. That one you need to reference your Relay data sheet to know what digits to throw into the formula in order to calculate R17.

Hope that helps.

Cheers. 
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: nielsk on June 18, 2012, 11:12:18 PM
Thanks for the reply, the schematic notes for the HE amp to use 47K for R12, so obviously there is an established value for R15... it just does not happen to be documented.
I get it about R17, what is the deal on R1A & 2A?
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Grummy77 on June 19, 2012, 01:31:56 AM

Not sure about R1A & R2A. I built mine to run off of 24v and I thought those were only for 16v. I thought I read Igor explai the 16vsetup somewhere on the forum here.


Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on August 19, 2012, 12:34:04 PM
Hi
I'm putting together my shopping cart for this EQ, but I can't seem to find a good match for the 10 way pcb-pcb connector. Anyone able to point me in the right direction?

Cheers :D
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on August 19, 2012, 10:29:45 PM
http://il.farnell.com/multicomp/2212s-10sg-85/socket-pcb-1-row-10way/dp/1593464
http://il.farnell.com/multicomp/2211s-10g/header-1-row-vert-10way/dp/1593417
http://il.farnell.com/samtec/ss-110-t-2-n/receptacle-2-54mm-thru-hole-10way/dp/1668209
etc etc
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on November 30, 2012, 12:45:08 PM
Are there people who finished their EQ's? Anyone? ;)
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Grummy77 on November 30, 2012, 01:14:50 PM
Haha. I have but I unfortunately messed something up. Got busy, so I haven't had the time to troubleshoot. I am able to use it but it has some issues. I've had great success using it on a stacked BG vocal bus.

The actual EQ curves do what I would expect them to based on Helios type 69 plots I've seen on line. With one side effect that on mine there seems to be a low cut filter happening at all times from about 40-50hz or so.

The issue that sucks most for me is I have no headroom coming out of the DAW I need to drop the level by 15-20db or it get pretty distorted. Especially when I start boosting (which is nice to do with this EQ). It might be my power supply though too. It puts out 24v but just barely. I'm wondering if it just sags under +-24 once I start powering the EQs. Do you know off hand if that could be cause the lack of headroom I'm experiencing?

I also think I gently fried some components. On my Power Supply, on these EQs, and on my RACKIT. :(. when testing them I think I actually shorted the +24 & -24 sockets on the HE69s (both of them). It was safe to say I was swearing up a storm that day. I did see some smoke. But didn't see exactly from where. My RACKIT's out of commish and the power supply no longer gives me phantom Power and my +-24v looks extra squiggly on the oscilloscope. I've just got around to ordering news caps 337s & 317s for the power supply & RACKIT. hopefully that's all I'll need. But I did also order new fresh electrolytic caps for the HE69s too. Hoping that's all I fried. I might order a Beecher transformer for the powersuplly too. But I'm also just considering buying one off the slick CAPI floor supplys that Jeff has and calling it a day.

Honestly I should have upped my DIY chops before attempting these. I have been learning exponentially from the process though. If I pretend this was school, then it's an inexpensive coarse. ;)

Cheers.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: whomper on November 30, 2012, 02:03:12 PM
Are there people who finished their EQ's? Anyone? ;)

Waiting for Grayhills. Should arrive in a week if all goes well :-)

Looking to finish the two HE-69 by end of next week, so will report then. Hopefully it will go smoothly.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: tonycamp on December 03, 2012, 02:00:49 PM
Does anyone know the final cost for this build, i'm trying to budget, and it's taking me forever to figure all these kits out!! :o

thanx for your help ;)
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Grummy77 on December 03, 2012, 03:57:06 PM
All said and done I think I was in a good $900 -$1000 total for my pair. This was using the THAT IC on the input and the Lundahl tranni output. If I can work out all my bugs it'll have been well worth it.

Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on December 03, 2012, 09:17:45 PM
Grummy77: fix the fried stuff and let's fix the rest together!
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Axelerator on December 11, 2012, 09:36:00 AM
hi igor, just to be sure..i soldered now all the pins on lundahl out tranny, and zobel and load resistor determines if it is 1/1 or 1/2 ?
second..
going to use some 24v doas from pier and he wrote me for best performance of his 2050e on output i should invert C8 and C9.now i wonder if he means swapping the C´s or inverting the polarity on each.. got confused :-\
thanks alot
ax
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on December 11, 2012, 08:04:22 PM
hi igor, just to be sure..i soldered now all the pins on lundahl out tranny, and zobel and load resistor determines if it is 1/1 or 1/2 ?
second..
going to use some 24v doas from pier and he wrote me for best performance of his 2050e on output i should invert C8 and C9.now i wonder if he means swapping the C´s or inverting the polarity on each.. got confused :-\
thanks alot
ax

For placing the out trafo, you have pictorial. All pins should be soldered.
If use 1524, load is 1...3k, zobel is 4n7...10n with 200r...1k.

If these opamps have some dc offset and output is about some millivolts...volts to minus, yes reverse polarity of caps.
c9 is 220...1000uf, 16...35v; c8 is 100...200 uf, 16...25v.
Fluke at dc voltmeter range, - to ground, + to opamp's out, and you know exactly what to do with the caps:)
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Axelerator on December 12, 2012, 12:04:57 PM
cool 8)

sometimes it is as easy !
..had to take main price advantages in your shop lately.
diying is proof again for the next  months  ;D

axel
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on December 13, 2012, 11:47:30 AM
Mm... ok :)
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: BajenKeno on December 19, 2012, 09:03:53 PM
Hey people! I wonder if theres an ~estimated total cost for the kit ($200) and all the parts needed?

Regards /Simon
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: tonycamp on December 19, 2012, 09:24:32 PM
anyone finish and try one of these yet? I'm sure they're gonna be great, as Igor is a monster, just curious to hear character and opinions on it.

thanx
T
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Igor on December 21, 2012, 03:24:26 AM
Hey people! I wonder if theres an ~estimated total cost for the kit ($200) and all the parts needed?

Regards /Simon

With pcb's, fronts/lbrackets and inductors from us, you need about $130-240 per one EQ channel.

anyone finish and try one of these yet? I'm sure they're gonna be great, as Igor is a monster, just curious to hear character and opinions on it.

thanx
T

Thanx for compliment, I am Addams. Sound talks - "punchy, creamy and crispy". Bah! Hate sound talks.
From my experience. Useful EQ with very different character from most of things I heard. Low boost is the "cool thing" here.
Always works on kick. Can be cool for vocals, too.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: whomper on December 26, 2012, 11:46:43 AM
From my experience. Useful EQ with very different character from most of things I heard. Low boost is the "cool thing" here.
Always works on kick. Can be cool for vocals, too.

Indeed. Finished two (with Igor's help) and the low boost is really something. It does not only boost but add some warm distortion as well. Interesting high end, not the silky EQN, rather adds subtle shine.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: whomper on December 26, 2012, 11:47:25 AM
What did people for knobs? Am looking at available options for those thin shafts.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on January 25, 2013, 10:37:37 AM
Looking to build this with the THAT chip input option and trafo output.

Anyone done one like this? Any hints/things I should be wary of?

Bit stuck on finding the values for the zobel network - R13, R14, C10 - anyone want to share their values?
LL1517 seems to be most readily available trafo in UK so will use that.

I'm putting together a mouser BOM for this specific option (minus the grayhills, trafo's and a couple of other bits mouser doesn't stock) and would like to get it all in one go (avoid paying lots of p&p!). It currently misses R13, R14, C10. The relays also aren't there as the only suitable ones had a lead time of 23 weeks, so I'll use Farnell for those. Grayhills from Digikey.

http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=b2048887f3

http://uk.farnell.com/te-connectivity/fx2-d3243/relay-pcb-dpco-5vdc/dp/9913947?Ntt=9913947




For the knobs, Igor wrote this on the 1st page:

"The knobs are ELMA.
In Israel, they are available from local distributor (MOQ = 100+); in small quantities,
these knobs, usually in black, are available from Farnell.
10mm wing knob, 10mm knob, grey, without line, + black skirt with line, + black cap with line; 3.15mm shaft.

The great advantage of these knobs is they are available in sizes 9...45mm for every possible shaft,
can be stacked for concentric pots, can be used with skirt/pointer, etc. Excellent quality BTW.

http://il.farnell.com/jsp/search/browse.jsp?N=2017+202401&Ntk=gensearch&Ntt=elma+knob&Ntx=mode+matchallpartial"
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on January 25, 2013, 05:22:32 PM
This datasheet for the LL1517 seems to suggest that the zobel network isn't necessary:

http://www.canford.co.uk/ProductResources/ig/2735.pdf

(page 2, 'optimum load for best square wave response)

I might see how it goes leaving R13 & c10 out, with 600R for R14.

This would make the mouser BOM above complete, with the following parts sourced elsewhere:

Relays & ELMA knobs (Farnell) , Grayhills (Digikey), Lundahl LL1517 (canford)

Just need to sort out the components for the DOA board that came with it and I\m ready to roll...
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on March 16, 2013, 08:00:22 PM
Almost finished with this build. Just need to wire in the switches, pots and solder the grayhills.

Couple of questions on the grayhills...First, the stop pins. As far as I can work out, just 1 pin is required for each switch, placed in the '6 o'clock' position??

Also, did you have to cut the shafts to fit the elma knobs?
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: HMPS on March 17, 2013, 08:22:13 PM
Igor,

I'm looking at building these.  Are all of the materials included in your kit? 

Thanks!
David
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on March 18, 2013, 12:04:56 PM
Anyone out there??

Few questions for this build:

Stop pins for the grayhills: As far as I can work out, just 1 pin is required for each switch, placed in the '6 o'clock' position??

Transistors on the HE amp from igor: the BC184 and BC214 are obsolete now...I found this instead of the 184:
http://uk.farnell.com/jsp/search/productdetail.jsp?sku=9556389

But can't find anything for the 214, any suggestions?

hello??
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on April 09, 2013, 09:26:14 AM
HMPS: The kit (if you recieve it) includes the PCB, front panel, inductors, mounting hardware & opamp PCB (if chosen).

You have to source the components yourself. If you look through this thread you might be able to guess that the documentation for it is quite sketchy and support non-existent.

I created a mouser BOM (see this thread) for most of the components. The switches are available from digikey.
My BOM is for the THAT1246 input and I opted for the Lundahl 1517 output.
I had to go to Farnell for the relays - I am still not 100% sure that the ones I got are suitable (from the datasheet they should be...)

Some of the capacitors are unusual values which you might not find in mouser, but I could find all the missing ones (as styroflex caps) on ebay.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on April 09, 2013, 09:35:04 AM

Ok, I'm going to attempt another couple of questions, although I severely doubt there is any point.

First of all, the obsolete BC184 amd BC214 can still be found on ebay, if anyone is wondering.

My questions:

1. Grayhill switches. On page 2 igor indicated (via the picture I have attached) that the stop pins should go in the 12 and 11 o'clock positions for all switches.
However, this would give 10 positions and both the schematic and front panel seem to indicate that we need 11 positions.
So what is the correct placement for the stop pins?

2. I am unsure of the wiring of the XLR/BYP/INS Switch. Again it is not shown in the 'pictorial'. This should go to BYP1 BYP2 and BYP3 holes on the board, but which order? BYP3 seems to be for the INS, which is the 3rd position on the switch (according to front panel layout), so it should go to the 3rd pin? XLR is the first position, so this should be pin 1? Can you confirm this?
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: jsteiger on April 10, 2013, 08:38:04 PM
.....1. Grayhill switches. On page 2 igor indicated (via the picture I have attached) that the stop pins should go in the 12 and 11 o'clock positions for all switches.
However, this would give 10 positions and both the schematic and front panel seem to indicate that we need 11 positions.
So what is the correct placement for the stop pins?
This makes sense. 1 pin will give you all 12 positions with a stop pin "in between" the first and last positions. 2 stop pins right next to each other will give you 11 positions. Think of the wiper locations as being in between the holes for the stop pins.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: waner on May 07, 2013, 01:18:18 PM
Hi

I`m about to finish two of these, but I have a hard time sourcing the relays.
Can anybody give me a tips on a relays for this unit?

Also
I`m building these with the HE amp. On the schematic it says to leave out C7 and R11. Is that correct?

Thanks
Mattias
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on May 07, 2013, 04:26:19 PM
these seem ok
http://uk.farnell.com/te-connectivity/fx2-d3243/relay-pcb-dpco-5vdc/dp/9913947?Ntt=9913947
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on May 19, 2013, 06:26:47 AM
Finally finished my unit!

Good news: it passes audio

Bad news: that is all it does :(

It seems like it stuck in permanent 'bypass' mode; audio passes through even when no power is supplied. When I switch the contacts I can hear each relay switching, but nothing changes :(
I measure 16v at the THAT1246, 24V at the DOA and 1.25V at R17 (as it states you should in the docs) when the power is on, which all seems fine.

Any help on where I might be going wrong/other tests I can make?

Pics:
(http://i1355.photobucket.com/albums/q715/James_Ramm/IMG_1796_zpscd49df10.jpg) (http://s1355.photobucket.com/user/James_Ramm/media/IMG_1796_zpscd49df10.jpg.html)

(http://i1355.photobucket.com/albums/q715/James_Ramm/th_IMG_1797_zps34b1eb17.jpg) (http://s1355.photobucket.com/user/James_Ramm/media/IMG_1797_zps34b1eb17.jpg.html)

(http://i1355.photobucket.com/albums/q715/James_Ramm/th_IMG_1798_zps969322f2.jpg) (http://s1355.photobucket.com/user/James_Ramm/media/IMG_1798_zps969322f2.jpg.html)
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on May 21, 2013, 09:21:45 AM
Traced my problem back to the relays. The input relays aren't switching....it seems like their default position is off/in 'bypass' and powering the unit should switch these to being on.
But it doesnt. So nothing getting through to the input.
This is odd as when I cross the wires I can hear the relays 'click'. But perhaps this doesn't mean that they are actually switching.

So next step I will take is to remove the relays and put a jumper across to hardwire it to 'on'. Then I can see what else I have screwed up!!

:)
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: taliska on October 25, 2013, 01:02:06 PM
Hi.

I'm planning on building a pair of these soon (hopefully in igors favoured configuration), and was wondering whether anyone has a/b'd the lundahl LL1524/LL1517 transformers that are recommended for this build?

Just trying to work out whether it's worth importing the preferred one that isn't readily available in the UK (LL1524) or just using the one that is...(LL1517)...

Thanks!

Kaz
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: zayance on October 27, 2013, 05:32:33 AM
Traced my problem back to the relays. The input relays aren't switching....it seems like their default position is off/in 'bypass' and powering the unit should switch these to being on.
But it doesnt. So nothing getting through to the input.
This is odd as when I cross the wires I can hear the relays 'click'. But perhaps this doesn't mean that they are actually switching.

So next step I will take is to remove the relays and put a jumper across to hardwire it to 'on'. Then I can see what else I have screwed up!!

:)

Mine is sitting on lab bench for a huge amount of time now, not much time for diy and even less for troublshooting these days :/
I have the same problem with mine, first i had the relay Igor mentionned on farnell codes and it wasn't working well, since it switching was occuring if a minus voltage was applied to the relay (bi-stable iirc the name) so i changed this to the normal relays we use in most of our builds here, and the unit was passing audio and EQ was beeing switched as well, but in bypass mode it was muting the signal, odd.
So mine is still at that state, and while all is soldered at right spot, i know that these work no prob since one forum member has his working good (serviced by igor tough), so it must be a simple mistake or a PCB tweak maybe (cut trace hardwire etc... but didn't look to deep into that) i guess i should move my a.. and try to find my prob as well...
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on October 27, 2013, 06:01:02 AM
It's been a while since I did mine and I'd forgotten how I'd left it. It works, but I just took a look at the insides and I can see now that I'd decided I didn't need the insert or bypass (as bypassing can be done at the patchbay) and just left it hardwired to 'on', no relay.


It would be good to get to the bottom of the problem as the BOM still reflects Igors part number; it must be correct if other members have working versions?

I might put out a competition to try and get a good tutorial for these things....
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: taliska on October 27, 2013, 09:13:48 AM
It's been a while since I did mine and I'd forgotten how I'd left it. It works, but I just took a look at the insides and I can see now that I'd decided I didn't need the insert or bypass (as bypassing can be done at the patchbay) and just left it hardwired to 'on', no relay.


It would be good to get to the bottom of the problem as the BOM still reflects Igors part number; it must be correct if other members have working versions?

I might put out a competition to try and get a good tutorial for these things....

I guess the ideal person to find would be someone who had the exact same problem with the relays and then managed to fix it, so they know what the exact issue is. Someone with a build that worked first time won't necessarily be able to say why...

Some other thoughts:

Does anyone have a front panel designer file for the face plate? (or have an unassembled one that they can measure up?) I'm happy to extrapolate based upon the images in the first post, but obviously I'd prefer more accuracy over less. The nice thing is that most of the pots and switches are point to point wired, so exact positioning doesn't matter, but the grayhill is pcb mounted, so that's a little bit more critical.

FWIW, if I do end up making a fpd file for myself, I'll make it available here, but obviously it will be use at your own risk! ;)

Kaz
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: zayance on October 27, 2013, 09:24:03 AM
Well i guess i Found the prob, need to confirm that, but that was a stupid one if so, so Huge LOL...  ::) :P
I used ON-OFF-ON switch (can't see if that's your case as well ramshackles?),  BOM says clearly not to use if not using "Insert" option (Pre) so ON-ON there since i'm not using his albatross pre

Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on October 27, 2013, 09:26:16 AM
It's been a while since I did mine and I'd forgotten how I'd left it. It works, but I just took a look at the insides and I can see now that I'd decided I didn't need the insert or bypass (as bypassing can be done at the patchbay) and just left it hardwired to 'on', no relay.


It would be good to get to the bottom of the problem as the BOM still reflects Igors part number; it must be correct if other members have working versions?

I might put out a competition to try and get a good tutorial for these things....

I guess the ideal person to find would be someone who had the exact same problem with the relays and then managed to fix it, so they know what the exact issue is. Someone with a build that worked first time won't necessarily be able to say why...

Some other thoughts:

Does anyone have a front panel designer file for the face plate? (or have an unassembled one that they can measure up?) I'm happy to extrapolate based upon the images in the first post, but obviously I'd prefer more accuracy over less. The nice thing is that most of the pots and switches are point to point wired, so exact positioning doesn't matter, but the grayhill is pcb mounted, so that's a little bit more critical.

FWIW, if I do end up making a fpd file for myself, I'll make it available here, but obviously it will be use at your own risk! ;)

Kaz

Front panels and L-brackets will soon be available from my site
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: taliska on October 27, 2013, 09:33:45 AM
Front panels and L-brackets will soon be available from my site

Awesome! FWIW, it would be nice if the brackets and fronts were available separately, as I've recently just used schaeffer for the first time for a couple of front panels for the 9k500 project, and they turned out really nicely and not too expensive, so I'm more inclined to do custom front panels to differentiate a little bit! Seems fitting for a project with more options than normal...

;)
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: zayance on November 07, 2013, 01:47:43 PM
Allright, well little update, my last discovery, on last post was a quick and futile ignorance ha, not much concentrated these days, too many things in the head, anyway...
I have two of these, one as said before had the bypass not working, but when ON (XLR mode) it was passing signal and EQ was working etc..., but on the second i have, while the bypass was working i wasn't getting any good signal when ON  :o, and found out that it was because of a bad LL7101 (bad contact), had another one in stock, changed it and now at least one works no prob, on-off-on switch etc....
The first one, even if beeing an exact copy, still gives same prob, bypass mutes signal etc..., for now i leave it as is, and will further check things, but it could be a slight connection prob or maybe a bad connection, and as said can bypass an DAW or patchbay anyway just a quick update...
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on November 07, 2013, 02:36:29 PM
Front panels and L-brackets will soon be available from my site

Awesome! FWIW, it would be nice if the brackets and fronts were available separately, as I've recently just used schaeffer for the first time for a couple of front panels for the 9k500 project, and they turned out really nicely and not too expensive, so I'm more inclined to do custom front panels to differentiate a little bit! Seems fitting for a project with more options than normal...

;)

They would be available separately.
FYI, all the docs (downloadable from the site) have corel draw files for the front panels, so you could get them and your l-brackets made by whoever you like (and customise them etc)
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: taliska on February 20, 2014, 05:34:24 AM
It's been a while since I did mine and I'd forgotten how I'd left it. It works, but I just took a look at the insides and I can see now that I'd decided I didn't need the insert or bypass (as bypassing can be done at the patchbay) and just left it hardwired to 'on', no relay.


It would be good to get to the bottom of the problem as the BOM still reflects Igors part number; it must be correct if other members have working versions?

I might put out a competition to try and get a good tutorial for these things....

Hey Ramshackles, got a couple of questions if you've got time... (I'll be building my he69s soon)

Did you ever get to the bottom of your relay problems?

Was the relay switching the only major issue you came across?

Cheers,

Kaz
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on February 20, 2014, 07:32:50 AM
I skipped out the relay and 'hardcoded' it.

I've heard from a couple of other people who had relay problems that they replaced their relays with these:

http://uk.farnell.com/jsp/search/productdetail.jsp?sku=9913890&CMP=i-bf9f-00001000

and it worked fine.

As I've seen in other threads, the cascode opamp that can be used with this project is easy to mess up due to it's tiny size. You should also be careful with the pin numbering of replacement transistors (dont just stick them in!)

Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: taliska on February 20, 2014, 08:18:39 AM
I skipped out the relay and 'hardcoded' it.

I've heard from a couple of other people who had relay problems that they replaced their relays with these:

http://uk.farnell.com/jsp/search/productdetail.jsp?sku=9913890&CMP=i-bf9f-00001000

and it worked fine.

As I've seen in other threads, the cascode opamp that can be used with this project is easy to mess up due to it's tiny size. You should also be careful with the pin numbering of replacement transistors (dont just stick them in!)

Great, thanks for the info. Those relays are the same ones as used in the F76 by the looks of it...

Regarding the cascade opamp, yeah, that was me! I put in my 2n2484s with their collectors and emitters swapped due to not noticing the different pinouts on the central semi versions. I've ordered some replacement ones (multi comp) from farnell which have the same wrong pinout though, so hopefully with a bit of fiddling things my F76s will be running before too long! ;-)

Kaz
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Grummy77 on February 20, 2014, 11:02:03 AM
I don't suppose Igor is still kicking around this thread?

Igor - I know it's been well over a year since your offer but I'm hoping it still stands. On 30NOV12 you said to fix my fried components and we'll fix the rest together. I believe I've finally fixed my fried components. All of which I believe we're actually in my powersupply. I also had an underrated power transformer in that power supply for 51x capabilities. With my power supply issues resolved it cleared up my biggest issue with these EQs. Which was no headroom. They now take line level perfectly.

My only real remaining issue is that I seem to have a permanent highpass filter happening. Every other eminent of the EQs seems to work as I'd expect based on graphs I've seen on these EQs. It's jus as though there's a permanent HPF at around 50-100Hz (perhaps more of a low shelf heavily cut). When I switch the EQ to use the existing HPF it too behaves like I would expect. Just does it on top of my permanent low cut issue.

As is, in certain scenarios it's actually very useful. Good for things where I'd cutting down there anyways. Vocals (love them on group vocal bus), acoustic guitar, stuff like that. But it would be nice to have them functioning properly. Then I could try them on drum bus or even the whole mix sometime.

Thanks.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: taliska on February 25, 2014, 08:33:23 AM
Hey all,

Random question to anyone who might know:

Earlier in the thread, it is suggested that non-shorting grayhills can be used in the two positions that are designated as requiring shorted grayhills.

Does anyone know what the practical difference between the two will be when used on this board? I understand the difference is BBM or MBB, but I'm rather asking which is the correct one for this board and what the real-world difference will be?

The only other experience with grayhills I have is in full kits and Peter P's EQN, which used non-shorting switches, but then he had lots of little resistors on the board which which were used for smoothing the pops out I believe. I can't see anything approaching the same function on Igor's pcbs...

Cheers,

Kaz
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: taliska on March 05, 2014, 08:36:59 PM
Not sure there's anyone paying attention to this thread, but here goes...  ;)

I'm just in the process of wrapping up my mouser order for my components and not being a genius when it comes to this stuff wanted to state my understanding of the less well documented parts of this build for clarity's sake.

The output transformer can be setup for 1:1 or 1:2. At some points in this thread I thought that the choice was completely arbitrary, but it seems to be now, that the correct thing to do is to use 1:1 when the input transformer is included, and 1:2 when the balanced line receiver is being used.

It's my understanding that there is a 6db loss when using the balanced line receiver, as the That1246 is a 1240 series component, and the 6 means -6db of gain. There are other 1240 series ics available, but the 1246 seems to be the best for input headroom.

Because I'm using the cascode amp from Igor's F76, I'm using R12 : R15 == 2k49 : 511R, which Igor states is suitable for his amp for 1:2 operation (are these the only things required for 1:2 operation?). Additionally, when those values are used, it's also mentioned that C7 should be 330 pf.

R17 is dependent upon the relays used. It's recommended that 12v relays are used instead of the original 5v ones that were specified.

The following ones were recommended: http://uk.farnell.com/jsp/search/productdetail.jsp?sku=9913890&CMP=i-bf9f-00001000 and they have a 1K coil resistance.

According to the SCHEM_PS_IO_RELAYS.png file, to calculate the resistance required for R17 when using relays with 200R coil resistance, the following should hold true:

r17 = (voltage required at r17 / (voltage required at relays / coil resistance));

r17 = (1.25 / (5 / 200)) = 50R.

It should be noted that I just played with the numbers until they made sense, as I find the words in the schematic less than clear personally.

Also worth noting is that the schematic says..."possible to use 12v relays with 9v on each relay".

As I understand it, relays are switched by the current passing through the coil and magnetising the switch. For the 12v relay, that means that the switching current is (found the formula on a random electronics site, but it makes sense to me...):

coil current = (supply voltage / coil resistance), so:

blah = (12v / 1000R) = 0.012 Amps.

Looking at the lm317 data sheet, it looks like this one is setup as a precision current limiter. Where limit current i = 1.2 / R.

So if the coil needs 0.012 amps to trigger it, then that must mean:

R = 1.2 / i, which is:

R17 = 1.2 / 0.012, which gives 100R.

Performing the same calc using the schematic formula, and substituting the coil resistance in for the 12v coils and also substituting the 9v for the 5v gives:

r17 = (1.25 / (9 / 1000) = 138.8888889R

which is ok if 9v is an acceptable voltage, but obviously if 12v is used instead, then it matches up with my other result...

r17 = (1.25 / (12 / 1000) = 104R.

(well near enough...the discrepancy is 1.2 vs 1.25).


So, after all that, I've just got one simple question (and congrats for reading this far!):

If I go ahead and use those 12v relays, should I use:

a) 100R.
b) 138.8888889R.
c) 104R.

Answers on a postcard. :)

Kaz
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on March 06, 2014, 01:55:52 AM
I only have limited knowledge, so this might have mistakes (makes sense in my head anyway). Here goes:

The suggested relay has a coil resistance of 1.028Kohm and a coil voltage of 12V, this gives a current of 0.01167 A from ohms law.

We know the voltage across R17 should be 1.25V - that is the output voltage of the LM317 (actually, some of them are 1.25V, some are 1.2V - it says on the datasheet).

So, ohms law gives us a value for R17 of 1.25/0.01167 = 107 ohms or (103 ohms for 1.2V).

That is a bit of an awkward value, but if we look at the datasheet, we see that the operating range is not a single number, but anything between a couple of numbers. So going with a 100 ohm resistor will be fine.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: taliska on March 06, 2014, 02:33:12 AM
I only have limited knowledge, so this might have mistakes (makes sense in my head anyway). Here goes:

The suggested relay has a coil resistance of 1.028Kohm and a coil voltage of 12V, this gives a current of 0.01167 A.

We know the voltage across R17 should be 1.25V - that is the output voltage of the LM317 (actually, some of them are 1.25V, some are 1.2V - it says on the datasheet).

This gives us a value for R17 of 1.25/0.01167 = 107 ohms or (103 ohms for 1.2V).

That is a bit of an awkward value, but if we look at the datasheet, we see that the operating range is not a single number, but anything between a couple of numbers. So going with a 100 ohm resistor will be fine.

That's awesome ramshackles! :) Thank you for taking the time to check my numbers (and approximating less than I did!). Should finally be able to submit my mouser order with some level of confidence now.

Kaz
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on March 06, 2014, 03:56:48 AM
No problem. Your logic in the first part seems fine as well. The THAT1246 gives -6dB of gain, so to get back to unity at the output, a 1:2 transformer makes sense as dB = 20log(V/V0)  = 20log(2/1) ~= 6dB
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: taliska on March 12, 2014, 05:57:19 PM
No problem. Your logic in the first part seems fine as well. The THAT1246 gives -6dB of gain, so to get back to unity at the output, a 1:2 transformer makes sense as dB = 20log(V/V0)  = 20log(2/1) ~= 6dB

Great. Good to know that my brain isn't completely broken! ;)

I suspect I'm the only person building these at the moment, but just in case, I thought I'd clarify on one of the first posts in this thread.

Early on in this thread, someone asked about the which orientation the carnhill 9048 inductor should go in, and Igor suggested looking at the data sheets and the numbers printed on the back of the board. If you're a bit like me, it's quite tempting to think that the "start" pin on the inductor (the one with the white dot on it), should go approximately somewhere near the start text that's printed on the board. However, this would be an incorrect conclusion and luckily I decided to do some probing with my continuity tester before soldering as it would have been backwards! It turns out that the pins are routed pretty much to the opposite sides for the 9048 footprint.

Anyway, just thought it was worth mentioning, as I hadn't seen anyone state it explicitly for the less gifted of us around here! ;) I've included a picture to show the correct orientation...hope it helps someone!

Cheers,

Kaz
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on March 12, 2014, 06:36:29 PM
Good stuff. I think the silkscreen text refers to the inductors that Igor wound (and originally provided with the kit).
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: chris77 on March 13, 2014, 10:33:08 AM
Hey,

Just finished a pair of He-69eq's ,using the line reciever and Whistlerock Ml918 DOA's using 47k resistor in r6,r7 and r8 for 24v operation ,they sound great,also have a pair of the hybrid amps using opa604 opamps,used 12v relays with 100ohm resistors which work ok ,for r12,r15 i used 25k, 5k and used sockets so i could change the values.i installed the carnhill 9048's the wrong way round after a quick desolder i was back on track and the eq's sound good 8) .
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on March 13, 2014, 11:10:16 AM
Looks great - is that in a 19" rack using the rackit?

Any choice of a 'full frontal' shot?

Looks like you managed to find some 2 deck 12 position grayhills...digikey or elsewhere?

I'm glad it worked out well for you.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: chris77 on March 13, 2014, 11:46:08 AM
Yip ,Digikey ,had to pay some import tax on the switches though,which was a pain!!
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: taliska on March 14, 2014, 06:38:34 AM
Impressive stuff chris77! ;) Good to see people getting their He69s working...hoping to do the same once my digikey shipment arrives... (got another week to wait...)

Kaz
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: taliska on March 14, 2014, 07:05:58 AM
Hey people.

As I'm still twiddling my thumbs waiting for parts to arrive to finish off my He69s, I thought I'd take a look at the relay/switch stuff, as looking through the thread it seems to be a point of confusion and I wanted to get on top of it myself.

First a disclaimer. I have literally no clue what I'm doing and so I'm just doing my best to understand things as I go. The following info is how I see things, and hopefully someone smarter than myself can tell me if I'm on the right path or not. Additionally, none of this is tested yet, but hopefully soon.

(Oh, and I know I could just wire things up by looking at the pictures, but I don't want to do it that way...I'd like to be able to understand why stuff works if at all possible... ;) )

So, first thing to note is the way the circuit seems to be set up. That is, it seems to be that Igor configured it for minimum energy consumption for his common case... (well, that's my theory!)... that's why the default is for the EQ to be IN when the relays aren't being energised and the PRE is also IN when it's relay is not being energised.

Relay BYP1 -> Switches between audio IN & pass through.
Relay BYP2 -> Switches between audio OUT & pass through.
Relay BYP3 -> Switches between PRE & EQ.

Now I've never seen an original kit, so I don't have any idea of what this PRE business was about. The info that follows is just designed to help people that want a simple IN/OUT setup without the optional PRE. If I'd have given this more thought before ordering my relays, I probably would have left out BYP3 and just hard-wired it to ignore that stuff, but as it's too late for that, I'm just going to wire the switches to bypass the PRE with the knowledge that I could always experiment with something later...

And now an attachment to show how I think things should probably be connected, and the reasoning behind it. Hopefully I'm not talking crap right now...

Cheers,

Kaz

Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: taliska on April 12, 2014, 09:45:29 AM
Hey all.

A quick post to show people my (kind of) finished He69s along side my other EQs and also a request for a bit of advice on tracking down sources of distortion in the build.

Anyway, I spent some time last night putting my various EQs (EQNs/studer169s/he69s) through their paces as I haven't really had much time to use any of the stuff I've been building. I just sent sent some tracks from Logic out to each of them and back again and played with the knobs a bit to see what was possible. The good news for me is that they're all quite usable and seem to occupy different niches.

Obviously the studer 169s are the simplest ones and so unsurprisingly the ones that are best calibrated (less to go wrong!). Using those reminded me that the EQNs aren't actually properly calibrated yet. I'm going to need to get an oscilloscope before I can do that (will be starting an advice thread in the lab for that shortly).

The EQNs obviously don't need any introduction as they get a lot of love around here. Calibration excluded (the real world effect of which was differing output levels), they're obviously quite powerful EQs. Sound good, look good. I think the only negative I have with them is that they can be a little bit intimidating because of the number of controls. I have to force myself to imagine there are fewer controls than there really is so that I don't over-sculpt.

The He69s IMO are the perfect sweet spot...when they're not distorting that is. Like someone mentioned earlier in the thread, I have to drop the level going to these by -20 db otherwise it's too hot for them. I haven't rushed this build, have had zero failures and feel like I've understood more than with other projects and on top of all that, they worked first time. This makes me think that my particular combination of I/O and DOA options has some undocumented problem/workaround that is required. Still, without that workaround in place, I really liked the level of control these EQs afforded. Not overwhelming and the high shelf is pretty tasty and the lo boost is pretty impressive.

Anyway, a picture is attached for those that like eye-candy. Now to talk about the distortion problems and working out how to fix them:

There are three possible configurations:

- transformer based I/O (pic shown in first post).
- transformerless I/O (other pic shown in first post).
- hybrid (never shown and the one I'm building: That1246 -> Cascode DOA ->LL1517 configuration).

I used the appropriate resistors for the cascode DOA as Igor suggested at the start of the thread (2k49, 511R).

I've had a quick look over the schematics and I'd like to answer the following questions if possible:

- Igor doesn't populate R10 in his examples. Looking at the schematic is looks like it's for smoothing out pops when using the mid-grayhill and without this there is no connection to audio ground. Surely this should be populated? Any ideas for a sensible value? I'm pretty sure things were popping last night when I was using it, so it would be nice to resolve that while I'm troubleshooting things.

- In Igor's builds in the first post, for the transformerless one where he's using his cascode DOA, he doesn't populate C8 (150 uF) and bridges it instead. Why? Could this be the source of distortion in my build? I've populated it as he never says not to.

- How did people trim their cascode DOAs with the onboard trim pot? Using a similar method to the F76 procedure? If this was set wrong, would it produce distortion? (it's for adjusting the DC offset, right?)

And finally...can anyone comment on what the most common sources of distortion are in these kinds of circuits?

If no one can think of anything useful I should do, I guess I'll probably pick up a cheap oscilloscope and try probing to find out where the distortion creeps in to the audio path...

Cheers,

Kaz
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Whoops on March 26, 2015, 10:09:47 PM
Hello,
I will start this project soon although Igors documents link "http://ij-audio.com/downloads/HE_69.rar" doesn't work anymore.

Could anyone please share those documents or send them to me by email?

thank you
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on March 27, 2015, 09:23:30 AM
http://cdn.shopify.com/s/files/1/0256/3541/files/He69_Documentation.rar?340
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Rocinante on March 27, 2015, 11:15:07 AM
Hey
For the cascode doa where did everyone find the 2N4249?
What is a suitable alternative?
Internet is flaky would 2n2907 work?  Seems close right?
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: Krcwell on August 30, 2015, 06:02:12 PM
Time for an ol' fashioned thread resurrection...

I've been piecing together a pair of these for a while, and finally got everything situated and in place for one of them today. Since this is a more complicated project without official support, I thought its probably smart to build one all the way and get it working before starting on the second.

I'm happy to say everything works except for the relay business (more on that below) and, after a little initial testing, everything sounds good!

It's a pain to track down all the necessary info for this build, so I figured I'd list off my configuration and TBD values.

+/- 16v for 500 series rack
Cut off 51x fingers (not neccessary), jumpered jp1/2 - this sends the +/- 16v to the DOA(s)
Transformerless input using THAT 1246
Transformer output using Lundahl 1524 - bought a pair from Andre on the black market, he might have more
R14 = 2k, per BOM notes 2-3k
R13 = 200r
C10 = 4n7    Couldn't find any data from the ll1524 data sheet, so used BOM notes
DOA = gar1731
R12/15 = 24k9/5k1 for 1:2

Now, on the relay business...
I populated the relays for BYP1 & 2, left BYP3 out as this seems to be for the mic pre insert
Hardwired the BYP3 relay footprint to ignore the "to mic pre" traces
For switch, using SPDT on-on with BYP1 connected to top, BYP2 connected middle, NC on bottom
I'm using TX2-12v relays, R10 = 100r

Right now it's always in, so not sure if that means the relays I chose are energised/working or not. I'm assuming my issue is that I can't ignore the BYP3 relay and switch position altogether... I'll play around with a few things and report back findings.

I also wound my own inductor on an rm8 core for the mid-band, using the carnhill for the low band.  First time winding an inductor, so I'm really happy that A) it's working, and B) seems to be working as intended. I'm currently using a n87 400 core, but I think I'll try a n48 400 core for the second of the pair. Looks like that's the core that Carnhill uses for their rm8 inductors, so it'll be interesting to see if there's a noticeable sound difference.

More to come.
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on June 02, 2017, 08:44:15 AM
FYI new location for docs & supporting files:
http://ramshacklerecording.com/projects/he69/
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: ramshackles on January 22, 2018, 02:13:30 PM
New He69 PCB's in stock:

http://www.ramshackleaudio.com/product/he69-pcb-set

New lower price for our new site :D
Title: Re: He-69 build/support thread. PCB's/kits-available!
Post by: jandoste on August 01, 2018, 08:06:28 PM

It's my understanding that there is a 6db loss when using the balanced line receiver, as the That1246 is a 1240 series component, and the 6 means -6db of gain. There are other 1240 series ics available, but the 1246 seems to be the best for input headroom.

Kaz

I'm having some issues with my Helios!
I've used;
- ML918( used 47k for +/-24V)
- LM317
- LL1524
So everything works so far so good but when the unit is engaged there is -6db loss. I've checked everything twice and read igor's notes but I lost my mind :-\ ! as igor never sent me back my 2 finished units so I've started to building another pair but I'm not sure if it was a good idea... btw I'd like to fix this issue!
The second issue that I'm having is that the MID is not doing anything? when I turn the knob so nothing goes there... again! I've checked all capacitors twice and nothing wrong with them :-/
Please let me know if you have any idea why I'm getting-6dB when unit is turn on and why the MID does nothing?

Thanks
Jan