alan smith ha scritto:
> I replaced it with a LM324, and as expected, the problem went away.  The circuit was designed by the client..supposed he used this before but I suspect not and the reason behind it was the ability to drive out 100mA of current.  I'm thinking that using the LM324 will solve the gain problem, and using some sort of current boost on the output..any suggestions on a simple transistor circuit?  The LM324 can source up to 40mA but they want to do at least 100mA.  Thinking a NPN/PNP pair (2N3904/2n3906) inside the feedback loop might be the easiest way?  They are rated for 200mA continuous, so that would provide the necessary drive.

FYI, I had a similar circuit were a basic LM741 or alike was driving a 
80-100mA load, and its output was driving a NPN/PNP couple as yours. I 
then moved to a TLC083 and it looked pretty fine, without aids.
Note that frequency was around 50-100KHz, SlewRate good enough, and 
shutdown capability as well.

-- 

Ciao, Dario
--
Cyberdyne
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist