> Turns out that adding a high gain but highly nonliniar inverting
> transistor amplifier stage to the output of an op-amp and taking the
> feedback to the positive terminal isn't such a good idea even though
> according to the models of op-amps they teach you at that level it should
> work.


Simulation can decieve you, don't trust it!..

I'm with Bob Pease on that one..  The best simulator is solder.
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist