Against my better judgement I bought some eBay amp boards because the price was reasonable, did not expect much and I was just curious.
After populating them I have an oscillation issue only on the positive swing. Have tried several things now including adding Zobel's on the outputs but literally nothing makes a difference. The distortion begins before the pre-drivers so its not in the output stage circuit. Any ideas?
I already see from the schematic that C1 and R4 are issues, what else?
Trace below is of a 1Khz sine, but the oscillation remains all the way up to 20Khz
It does not do it with a small signal.
Music sounds very strange, sort of reverb effect
After populating them I have an oscillation issue only on the positive swing. Have tried several things now including adding Zobel's on the outputs but literally nothing makes a difference. The distortion begins before the pre-drivers so its not in the output stage circuit. Any ideas?
I already see from the schematic that C1 and R4 are issues, what else?
Trace below is of a 1Khz sine, but the oscillation remains all the way up to 20Khz
It does not do it with a small signal.
Music sounds very strange, sort of reverb effect
