I am repairing one D amp and after reapir it works on any power level.....BUT,if i put on input 50Hz i can hear helicopter propeller (present on higher output levels only) on output - over this 50Hz which is stable and loud.....amp doesnt heat up and is stable.....but heli is the issue.Music plays ok and with music there are no helicopters at all 😀 .Any ideas?
Just solved.....wireing.I changed LENGHT of wires from pwm section to power module.....once i reversed that all works perfect.Un f***ing belivable.So what i have learned here is to NOT to repair anything that works,just that whats not working 🙂 .Rising endges and falling edges from pwm are 7-10ns .... and lenght change affected pwm information to power module.Admin can close this thread.
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