SSL 4000 EQ

[Vac11]

Thanks Vac 11! It gets crazy pixelated when I zoom in, but it's better than nothing

EDIT: Got it working!! Woohoo! Sounds good out of the gate. Now to calibrate it properly

Great to hear you fix it! Where was the problem?

 

[Deejsirois]

I've also uploaded the original SSL EQ and Filters schematics to the technical docs section:

https://groupdiy.com/index.php?topic=45604.0

You're awesome! Thanks!

 

[Deejsirois]

Great to hear you fix it! Where was the problem?

1246 and 1646 were fried....99.9% because I wired the power wrong (still shaking my head over that lol)

 

[Deejsirois]

Also the board layout

Super helpful!

 

[jasonallenh]

Any more of these PCBs hanging around out there? If not, I was thinking about ordering a batch.

 

[justinheronmusic]

Any more of these PCBs hanging around out there? If not, I was thinking about ordering a batch.

I have 2 that I am not going to use.

 

[TillM]

Milan also still sells them.

 

[Kevin]

Hi Friends
I'm designing this project in 500/51x series
i started a new thread for all who are interested
https://groupdiy.com/index.php?topic=76126.0

 

[MerlynMetal]

Hi,

It looks like now one can get center tapped pots from Aliexpress for cheap however they are mostly 50k and 100k ones (with detents as well). The dual gang 50k pot can be paralleled and used as a 25k pot.
Would anyone advise what changes in the schematic will need to be made (if at all) if I wanted to use single 50k CT pots?

 

[signalflow]

Hi,

It looks like now one can get center tapped pots from Aliexpress for cheap however they are mostly 50k and 100k ones (with detents as well). The dual gang 50k pot can be paralleled and used as a 25k pot.
Would anyone advise what changes in the schematic will need to be made (if at all) if I wanted to use single 50k CT pots?

As discussed somewhere in the first 2 pages a center tapped pot is not needed, you can add a toggle switch to bypass the filter if you want absolute "0" at center position.

 

[MerlynMetal]

Yes, I went through the thread couple of times but since those pots are not a problem to get anymore why not use them.

 

[Vac11]

Hi,

It looks like now one can get center tapped pots from Aliexpress for cheap however they are mostly 50k and 100k ones (with detents as well). The dual gang 50k pot can be paralleled and used as a 25k pot.
Would anyone advise what changes in the schematic will need to be made (if at all) if I wanted to use single 50k CT pots?

https://www.aliexpress.com/item/328...earchweb0_0,searchweb201602_,searchweb201603_

 

[signalflow]

Could roll your own.

Tapped Pot - chosenaudioproducts

 

[HerbertR]

They are working perfectly, top quality, for sure with center ....

€ 3,14 | 2 TEILE/LOS Importiert TOCOS typ RK09 präzisions-potentiometer, doppel B20K gürtel, mittelpunkt schaftlänge, 20 MM langen faden
https://a.aliexpress.com/_msgO5d0

 

[erkotojel]

They are working perfectly, top quality, for sure with center ....

€ 3,14 | 2 TEILE/LOS Importiert TOCOS typ RK09 präzisions-potentiometer, doppel B20K gürtel, mittelpunkt schaftlänge, 20 MM langen faden
https://a.aliexpress.com/_msgO5d0

Hello guys!

Could you help me where I can get some nuts to these 6mm shaft potentiometers? I have a few from an earlier project so I meassured one but can not find any place on the web... 10mm diameter nut with 6,3mm hole.

Thanks in advance!

 

[erkotojel]

finally I found the answer... I leave it here maybe it helps somebody...

https://hu.mouser.com/ProductDetail...=sGAEpiMZZMsKEdP9slC0YY1xR8VE8VuCFPPvShEelRU=

 

[Dr_J]

Hi everyone,

wow time runs by... my first post in this thread was 2012-10!!
Since then the PCBs were laying around... waiting...
Last year I though that would be a quick, nice and funny project... but it turned out an other way... but that's an other story...

Currently I got stuck trouble-shooting...
One channel is working fine, the second one has a problem in the LMF section.

I did all the easy checks: A/B comparing components, swapping NE5534, A/B oscilloscope comparing, re-soldered all components (both sides), tripple checked the P6 pot...
- No success... f***

Taking U11 out, the rest of the unit is working fine.
The Q-Pot P6 changes volume, creates artificial noise.

Has anybody a idea where to look next? What to check? Any ideas?
- Thanks!!
... i'm lost...

Cheers!

 

[HerbertR]

Finished a "Quad" 2U 19" the last days... Super EQs, real workhorses..., Now I am owner of 6 Modules .... Thanks to Casey Pitman for this great PCB Design, Frank from frontpanels.de, and Vami Milan "Vac11" for the PCBs.... Cheers

 

[Ricardus]

Finished a "Quad" 2U 19" the last days... Super EQs, real workhorses..., Now I am owner of 6 Modules .... Thanks to Casey Pitman for this great PCB Design, Frank from frontpanels.de, and Vami Milan "Vac11" for the PCBs.... Cheers

I definitely want to make those.

 

[RobinSouth]

Finished a "Quad" 2U 19" the last days... Super EQs, real workhorses..., Now I am owner of 6 Modules .... Thanks to Casey Pitman for this great PCB Design, Frank from frontpanels.de, and Vami Milan "Vac11" for the PCBs.... Cheers

Really wanna make this one to!! Look amazing!