So came in with blown outputs AOT412's.
Cannot find these devices.
Installed IRF3710Z's. Amp runs and plays audio but when gain in increased it loses pwm drive to the outputs.
Tracing back driving the outputs is a 20957S with PWM coming from a LM311? The 311 turns off PWM when input drive increases to a certain point.
The protection light comes on, but the 494 is not shutting down the PS.
Ideas?
Cannot find these devices.
Installed IRF3710Z's. Amp runs and plays audio but when gain in increased it loses pwm drive to the outputs.
Tracing back driving the outputs is a 20957S with PWM coming from a LM311? The 311 turns off PWM when input drive increases to a certain point.
The protection light comes on, but the 494 is not shutting down the PS.
Ideas?
The suppressed PWM when gain is increased is normal for this amp.
I believe the IC4-IRS20957 Pin 7 OCSET is setting output protect. TL494 is still running the power supply.
Because the IFR3701Z will have a different RDS on, hence higher output current R132-1.8k ohm will need to be a lower value. The exact value you will have to experiment to determine the right value. R133-7.32K may need adjusting also.
I believe the IC4-IRS20957 Pin 7 OCSET is setting output protect. TL494 is still running the power supply.
Because the IFR3701Z will have a different RDS on, hence higher output current R132-1.8k ohm will need to be a lower value. The exact value you will have to experiment to determine the right value. R133-7.32K may need adjusting also.