As I recall from high school the CA 3060 has a very low control
current tolerance, in the order of microamps. Did you current limit
the control voltage adequately (at least 2 Meg resistor as I remember).

Stublito

aQuoting nelsonj_sce < nelsonj_sce@... >:

> Anyone here designed circuits using a transconductance amplifier -
> specifically the 3080E used all over the OB-X
>
> I designed a simple 3080 circuit (based on the chip A6 3080 circuit
> on the OB-X mother board) that was intended to let me control the
> noise level on my OB-X using the PWM amount knob. But in just
> trying to calibrate it I burned up 5 3080 chips and a few
> transistors. I just don't get it - based on my calcs everything is
> well within ratings.
>
> I thought there might be someone here that has played with these
> things that could help me see what I am missing...
>
> Thanks - and happy new year.
>
>
>
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