[sdiy] Source for 3080's

[David G. Dixon]

> what's about the additional DIODE BIAS input and the darlington buffer of
> the LM13700? If I replace a CA3080 with it, can I ignore them?

Yes.  You can just leave them all unconnected.  I rarely ever use these
features myself, although they do occasionally come in handy, and not always
for their intended purposes.  For example, feedback to the diodes makes a
very nice automatic gain control circuit.