>
> I would be interested to see what happens to a sinewave through that
> Serge VCA at 1KHz and 10KHz. Its very odd that one sees so much ringing
> with a square wave even with unterminated banana leads. In fact, it
> would be hard to do that deliberately by bad layout alone. Perhaps it is
> a deliberate design characteristic to create an 'exciting sound'. What's
> the output do with no CV input I wonder, and does the overshoot get
> worse with greater CV?
>
Although I no longer have the unit, I can say that the sine/tri waves don't
have this problem.
∗Just guessing∗, I think it is a combination of bad pcb layout (single-sided
pcb) and the
fact every IC is in cheap-o sockets.
Since no one got my hint: the root locus of the positive and negative
'spikes' are 60Hz amplitude
modulated. This introduces an overall huuuummmmm at these low CV settings.
At higher CV,
the spikes more or less disappear.
<Paul S>