[sdiy] Discrete OTA

[David G Dixon]

> Can the 2164 be used as an expo + linear voltage to current converter?
> I was thinking along the lines of feeding a linear hz control 
> voltage into the input pin of a 2164 stage, and then the expo 
> control voltage into to the control pin of the 2164, and then 
> take the output current as control current for an OTA.

The 2164 output must terminate to virtual ground.  It is very very touchy
about this.  The control pin of an OTA rides very close to the negative
rail, so I don't think this is on.