VC envelopes

[Joachim Verghese]

Hi,

As I don't have much experience with voltage controlled envelope
generators, I thought I'd ask the list for some advice.

I recently built a CA3080-based ADSR, and discovered that it does
have the problems that were discussed in Curits' newsletter in the
early '80s, i.e. offsets of the magnitude of 100 mV, and substantial
CV feedthrough.

Is there any easy way to avoid these effects using modern-day
op-amps, etc?

Or perhaps the multiplication is best carried out with a expo
converter (a la Oberheim), and the 3080 could be used for current
polarity switching only?

Ideas welcome!

-joachim