Moog Music Forum

Here's my Werkstatt finished (sorta) with a custom jack panel. I've added a voltage follower circuit to buffer incoming gate triggers to the envelope generator. VCO EXP IN, VCF IN, KB CV OUT, and EG OUT are routed directly to the header points. VCO out is normaled through output jack back into an additional mixer circuit along with the Audio Input. This makes it possible to either route the VCO through modules and back into the filter or bypass the VCF and VCA. I think this is how Steve Dunnington designed his audio input on the werkstatt prototype. The diode clip switch bypasses an added distortion circuit inserted between the VCF and VCA. The diode clip uses a pair of diodes to ground then goes into an additional opamp circuit. Because of the positioning of the jacks, i short changed the amount of usable space on the experimenter pads.



The components are cramped together and i had to place components on both sides in order to make it all fit. In hindsight, i'm not sure if I would recommend adding the jacks to the back panel, because there's not a lot of room to spare between the PCB and the case. The right side of the case would have made more sense, but the back seemed more "moog". This was a bit of work, but completely worth the effort to make the Werkstatt part of my modular rig.

cool - looks awesome...

would you please also provide the modified schematics?
thanks!

This is perfect! Will you be offering this service for others? If so please let me know.

Thanks,
Jamie
SynthGraphics.com

Really nice work and answers a question I had about the patch section: no gate input! How strange... Also, when I use the envelope from my Pittsburgh SynthBlock I just get a 'tick' not the full envelope. Is there a publish spec for the voltages of each in/out of the patch section?

here:
Werkstatt-ø1 Manual & Schematic

Thanks, Red, I have those. Still the question remains: voltages for the patch panel?

*EDIT* Actually, no, I did not have this manual! Thanks Red, this appears to have more info than the one in the box

@peff, I borrowed your Gate IN voltage follower idea. If anyone's interested, I drew up a schematic of what to do to get an external Gate IN. It's fairly simple, but you will need to cut a trace for it to work properly.

why is a voltage follower necessary? why not simply switch internal/external gate with the jack?

I'm kind of an idiot savante with this stuff. I really want to add a few mods but need someone to spell it out for me. What I would like is to add a gate in, gate out, midi in, audio in and a permanent ground. Is there anyone who could walk me through this stuff.

jackson five



... the most difficult part is done

Werkstattumbau abgeschlossen




The five jacks are connected to VCF IN, VCO EXP IN, GATE IN, LFO IN and LFO OUT


Now it's a real funky little Moog synth

How did you wired the GATE IN ?

The GATE IN is inserted between U-14 pin 8 and C68. You have to cut the trace (marked //)...

Thank you very much for a quick answer.
What is the difference in outcome between your solution and the op-amp mod at:

http://laurentidesynthworks.blogspot.se ... -mods.html

I don't know... that's why I asked this before:

why is a voltage follower necessary? why not simply switch internal/external gate with the jack?

The only thing I know is that my Werkstatt is working and sounding perfectly