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TM3030 Debogging
MUFF WIGGLER Forum Index -> Oakley Sound Systems  
Author TM3030 Debogging
Quadram
Hi
I've just completed my build of a TM3030 but I am having a problem.
I have no sounds except a whistling changing (VCF !?) when I move the frequency/resonance potentiometers, VCO not working !?
The others parameters/potentiometers seem working.

What should I check ?

Thanks for you help
Synthbuilder
Quadram wrote:
What should I check ?


It could be your VCO is not working. So check all of the parts around that section. That is U7, U6, Q3, Q4, Q5 and nearby resistors and capacitors. In particular, check that you have fitted Q1 or Q2 correctly. Both must not be fitted and the one that is fitted needs to be the right transistor for that location.

A bad 'waveform' switch or wiring to that switch would also cause a silent VCO.

Tony
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