Class A 100W RMS

126

02:14:20

Op AMP as voltage gain and a matched pair for push pull with thermal coupling diodes. 
Experimental 
98Wrms 
Efficiency ~ Max 14%
OPA1612 Op amp 

published 10 years ago

thebugger

10 years ago

A negative feedback should be taken from the output. Add a 1k resistor from the output of the final stage to the (-) of the opamp

Stefan_N

10 years ago

Done. I almost forgot about it

thebugger

10 years ago

That's better. Usually it shouldn't be a problem to take the feedback directly from the op amp, it'll still act the same, minimising distortion and all, but then the op amp won't compensate for thermal drift of the output stage, and that's considerably important.

thebugger

10 years ago

One more recommendation. Replace the 500ohm resistors with a 10mA constant current source. Using an ideal op amp (as it's here) will compensate for the ,,sluggishness'' of a passive resistor, but in reality a CCS will ensure better performance.

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