Cgs synth

> I just tried to build up my Synthacon. Total nightmare...

I'd suggest you go very carefully over the board looking for construction
errors. If you have not used the exact transistors specified, make sure they
are in the correct way around. of the very few that haven't worked, it has
almost always been a construction error. Once or twice it was a faulty
transistor.

>1. Only getting sound out of the Hi Pass input

out of? do you mean that you only get an output when you feed the signal
INTO the HP input and not when you feed a signal into either the band pass
or low pass inputs?

>2. The sound is super fuzzy with lots of harmonics.

If the resonance is too high it can distort some, but I would not call it a
fuzz box. If you have used the wrong transistors, you may have way too much
gain. I specified metal can 2N2222 (or 2N222A) and 2N2907 for a reason.

>3. Ground hum.

Now that you can only blame yourself for. Wither you have an earth loop
somewhere in your system, or you have a poorly sheilded input somewhere that
is picking up hum.

>4. Pots dont' seem to control anything.

If wired correctly, they will. Is the frequency pot wired with its CW end to
+15, its CCW end to ground/0V and its wiper to one of the CV inputs?

The resonance pit needs only two wires - one the the wiper, and one to one
end. The other end is left not connected to anything at all.

>5. My Binary Zone does seem to control the CV frequency input.

which would indicate there is at least some voltage control - ans if your
pots aren't doing anything, that means at the very least, the frequency pot
is incorrectly wired.

>Does someone have a wiring diagram?

All the wiring info is in the circuit diagram itself. That should be all you
need.

>I did ground all the 1/8 inputs together.

Yes, the sleeve of all jacks need to be grounded.

>I first tried it with the Level pot and then took it out of the circut.

Do you have a link in place or the level pot instead?




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Ken Stone sasami@... or sasami@...
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