The 2 pins on the little black board do output some low level PWM when the amp is working, when it is not it outputs a square wave of the input frequency.
So problem has to be on that board?
Any tips?
I can try to chip of the epoxy and see what components are revealed.
And reason why output does not drop to zero when one pair stops modulating is that I then used 20kHz input and a wirewound inductive 12ohm load.
If I use 100Hz output drops to 0.
So problem has to be on that board?
Any tips?
I can try to chip of the epoxy and see what components are revealed.
And reason why output does not drop to zero when one pair stops modulating is that I then used 20kHz input and a wirewound inductive 12ohm load.
If I use 100Hz output drops to 0.
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