Home-made Modular Synth teething trouble

[Bjarne Nillson]

>I have built a simple modular analogue synth from designs in R.A.
>Penfold's book "Electronic Synthesizer Construction" with a few modules
>of my own.
>
>I get problems when interconnecting the modules, and I can't figure out
>what is wrong due to my limited knowledge of electronics.
>
>Most of the modules seem in interact in ways which are not acceptable.
>For example, I connect a noise generator to a op-amp amplifier and the
>noise cuts off above a certain volume. I thought that maybe it was
>necessary to put a buffer between the noise and amp, but this made no
>difference. Then I tried to smooth the power supply rails using
>capacitors, but this didn't work either. Another such problem is the 
VCO
>starts to oscillate when I connect an LFO to the S&H.
>
>I have been reading books on electronics, but none of them shed any
>light on this interconnection problem. I think this must be a basic
>modular problem and wondered if anyone here could point me in the right
>direction.
>
>Phil Callaghan

The problem is, you have build a nonworking synt due to the
fact that you have used a RA Penfold book!!!
The answer is that its lot of non working designs in those books...

regards
BJ



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