please anyone can help me check this circuit? because i cannot get the 60V waveform, just 2.8Vp-p. and which diode using in this circuit? zener, schottky or normal diode?
As beenthere says optocouple needs a resistor to current limit it. I'd suggest just shorting q2 base to ground and see if it works. If it works the opto is bad or your pwm is wrong.