[sdiy] Operational Transconductance Amplifiers

[David G. Dixon]

> Interesting.  Does anyone use the tanh response intentionally for
> distortion?  The best sounding digital distortion for guitar I've
> encountered was tanh based...

Absolutely.  It's the preferred way to shape a triangle wave into a sine
wave.  Using either an OTA chip or a simple differential pair, you can
obtain a sine wave with as little as 0.6% THD from a good triangle.