I need to remove the oscillation of feedback loop while fast response is maintained.I have no problem to avoid the oscillation if 47 nF cap is placed across output but since I want to feed the input with 16-20 kHz triangle the maximum output capacity should be about 10 nF.The simulation works well even with 10 nF but it oscillates in reality.
The problem can be slow response of PC817, however for 20 kHz signal without fast slopes like triangle is this optocoupler should be sufficient.
Is there some trick to easy compensate the phase is such a simple circuit?
Simulation:
(plotted Input and Output)(triangle signal on input)
Measurement of real circuit:
(plotted Input and Output)(constant DC signal on input)
