[sdiy] Analog drum machine start/stop

[Nicholas Keller]

Ben,

 Thanks so much for your response.  While trying to trace down where the
22K resistor was on the PCB, I noticed that I installed the electrolytic
connected to the volume pot backwards...I'm usually very careful about that
sort of thing, so I'm not sure how that happened. But maybe that was the
cause of the pop! I reversed that cap and changed the power source anyway
as you suggested, and the pop is gone now.

I'd like to make a correction to my prior comments about the transistor
pin-out.  They are all ECB and clearly marked on each body, but I must have
been seeing that as EBC.  Maybe reversing the cap doesn't sound so unlikely
after all.

Now I have one or two more tasks before I can send this back.  I don't hear
any snare at all, and the white noise adjustment trimmer (4.7K on this
early model) only seems to pass signal when fully-CW.  Maybe the two issues
are connected somehow, but I'm definitely hearing the cymbals so I'm
getting signal from Q9 to Q14.

Thanks again

Nick
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