Cgs synth

>I connected the PWM to a front panel jack. Did you mean the SQ wave
>doesn't work when there's nothing modulating the PWM input? Or that
>it has to be connected to the front panel?

It needs an input, usually from a pot, to work. If it doesn't have one, the
detection voltage the op-amp is seeing is outside the range of the signal.

Ken

>
>Cole
>
>--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>>
>> 1) Use a different VCO output. The square wave likes the PWM input to be
>> connected.
>>
>> 2) Sweep the tune knob, and if you still don't hear anything , try
>adjusting
>> the SPAN and ZERO trimmers. This VCO can quite happily work well
>above the
>> hearing range if these are wrong.
>>
>> Ken
>>
>>
>> >Hello everyone,
>> >
>> >I've build a small system, only the bare minimum to make music, so far.
>> >
>> >I have the following modules built:
>> >Oakley Basic VCA
>> >Music From Outer Space Lowpass Filter
>> >Music From Outer Space Envelope Generator
>> >CGS VCO
>> >
>> >I hooked everything up today, but there's no noise coming out. This
>> >is how I've it patched:
>> >VCO -> Filter -> VCA
>> >and
>> >EG -> VCA
>> >
>> >I'm thinking there's a problem with the VCO. I've only wired three
>> >things: 1V/Oct input, tune knob, and square wave output. I tried
>> >hooking this straight into my keyboard amp, but did not get any sound.
>> >
>> >Also, I have no idea if the EG or Filter are working. Is there anyway
>> >to test them without a VCO?
>> >
>> >The VCA seems to be working. I connected my guitar to it, and the
>> >gain knob DID change the volume, so that's good.
>> >
>> >Where should I start troubleshooting?
>> >
>> >Also, when I was first starting up the system with the VCO in place, I
>> >was testing to see if it was getting the correct voltages from the
>> >power supply. It was, but, when I was probing it with my multimeter,
>> >I accidentally touched the bracket that the PCB is connected to. This
>> >created a small spark... Could I have shorted the circuit, making it
>> >unusable?
>> >
>> >Any help would be wonderful. This is very discouraging.
>> >
>> >Thanks,
>> >Cole
>> >
>> >
>> >
>> >
>> >The CGS Modular Synth home page: http://www.cgs.synth.net/
>> >
>> >Yahoo! Groups Links
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> _______________________________________________________________________
>> Ken Stone sasami@...
>> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
>> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>>
>
>
>
>
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>
>Yahoo! Groups Links
>
>
>
>
>
>
>

_______________________________________________________________________
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>