Opps, I made another mistake.
I=92ve got an opamp driving a unity gain power opamp.
|\ OPA134 Vin---|+\ |\OPA544 | >--+----|+\ +-|-/ | | >--+--Vout | |/ | +-|-/ | +--10R--+ | |/ | | +-------+ R | GND
With 10 ohms hanging on the output there is a bit of cross-over distortion. Hey, I thought, I=92ll just feed back from the output and maybe the first opamp can =91goose=92 the second to reduce it.
So I changed it to this,
|\ Vin---|+\ |\ | >-------|+\ +-|-/ | >--+--Vout | |/ +-|-/ | +--10R--+--+ |/ | | +-------+ R | GND
Didn=92t work at all??? The output of the first opamp was near the negative rail and the output of the power opamp was about 1/2 of the positive rail. Mucking about (adding some C from the first opamp back to it=92s inverting input) I got the thing to work. But when I re-power or hit the rail with the output the thing stops working again.
Do I need to limit the voltage swing going into the second opamp?
Thanks, George H.