the amp has an issue where it plays audio fine at 12 volts but at 14 volts the audio cuts out. When I was poking around I noticed the 7912 regulator is only putting out -7.7 volts. Im having trouble figuring out why. I replace the regulator with no change
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Does no load or loaded make a difference?
Before installing the outputs, did you check for the proper operation of the TL072? I've never done it on this board but connecting a 10k resistor across terminals of 1 and 2 (or 6 and 7 if they're using the other half of the TL072) should tell you if the TL072 is working properly.
You have a badly damaged via (can be seen in the original post).
Is the drive good out of the LM211 going from 0% to 100% duty cycle when driven hard?
Before installing the outputs, did you check for the proper operation of the TL072? I've never done it on this board but connecting a 10k resistor across terminals of 1 and 2 (or 6 and 7 if they're using the other half of the TL072) should tell you if the TL072 is working properly.
You have a badly damaged via (can be seen in the original post).
Is the drive good out of the LM211 going from 0% to 100% duty cycle when driven hard?
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