asm problems.

[Troy Sheets]

Hey diyers,

I am working on my ASM-1 and I thought I would just throw out the problems
I am having so maybe somebody could give me some advice.

Both of my oscillators work wrong in the same way.  I have checked the circuit
and I know that I am getting an expodential current source off of the MAT-02
when I sweep the control voltage.  On the outputs I get an unstable, high
pitched tone that I change with the control voltage knobs, but the change
is erratic.  For example, I will sweep from -15 to +15 and the tone will go
from medium to high, then crackle out then come in high again and go medium.
I can't get any low tones out of the oscillator.  I have replaced several
components (like the 3140) and it still does the same thing.  Both oscillators
do this.

Whats interesting is that I hooked up the VCF, which works, except I get
that same high pitched tone out of my VCF output... and I don't even have
the oscillators mixed in anywhere (I am using an external oscillator).  I
can tweak the ASM's VCOs control voltage and it effects the high-pitched
output on the VCF.  I can tweak the VCO's control voltage so that it goes
away on the VCF.

So, I beleive that this high-pitched tone is not even necissarily coming from
the oscillator.  I scoped out a bunch of points on the VCO and I got a lot
of garbage.

Any suggestions are welcome.

-troy

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