[sdiy] Paia 9720 VCO Modulator?

[Tim Ressel]

Hi John,

A. Which molule??
B. Does it work okay with gate & trig in??

--TR

--- Diane&John  Rose <rosespace at earthlink.net> wrote:
> I am in the process of building a PAiA 9700 modular
> synth which is a great
> synth but I am hung up in one spot and no matter
> what I have tried, I can't
> get past it. I have even consulted numerous times
> with Paia tech support and
> still cannot solve this mystery. The problem relates
> to the modulator
> portion of the circuit, specifically the cycle mode.
> It is supposed to self
> trigger and cycle by itself in this mode. Mine
> occasionally will cycle once
> when the switch is in this mode and sometimes not.
> Sometimes it will cycle
> once when switched to AR mode. Sometimes the LED
> will light briefly when I
> turn the unit off. I have been over the circuit at
> least a dozen times
> looking for problems. I have even changed out the
> LM324 opamp , related
> transistors and capacitors all to no avail. I even
> get good readings on my
> meter with voltages being as they should. Any
> insight as to what could be
> going on would be most appreciated. This one has me
> stumped. Everything else
> works great on this synth and the modulator triggers
> fine when triggered
> from another source except that the attack and
> release seem to be reversed
> even though the LED shows them to be normal. This is
> all very strange.
> Thanks,
> 
> John
> Music is at the heart of Creation.
> 
> 


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