Remove the FETs and connect a 10k resistor between terminals 1 and 2 of the TL072 on the driver board. Drive a 100Hz signal into the amp and check for audio up to the input of the 21844s.
Adjust the level so that the output of the TL072 isn't clipping. Do you have a relatively clean sine wave out of the TL072?
What is the DC voltage on the output of the TL072?
Adjust the level so that the output of the TL072 isn't clipping. Do you have a relatively clean sine wave out of the TL072?
What is the DC voltage on the output of the TL072?
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I can't tell you the exact signal level to use. Reduce it until the output of the TL072 is no longer clipping. Did you install the 10k resistor?
If the TL072 was showing signal, the signal was reaching the driver board. Are you looking for signal with the driver board out of the circuit?
I can't tell you the exact signal level to use. Reduce it until the output of the TL072 is no longer clipping. Did you install the 10k resistor?
If the TL072 was showing signal, the signal was reaching the driver board. Are you looking for signal with the driver board out of the circuit?
Your scope is on AC coupling so 'below' is meaningless. You need to have the DC component included for drive signals. That's why using the scope in differential mode or using an isolated scope (handheld) is important.
You can shift the trace but when you do that, you have to also display or make note of the rail voltage for the waveform to be useful.
The shape of the waveform is not good. It should be very nearly perfectly square.
You can shift the trace but when you do that, you have to also display or make note of the rail voltage for the waveform to be useful.
The shape of the waveform is not good. It should be very nearly perfectly square.
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