The 5534s have a different pin configuration. For these, check for signal on pin 6 with the black probe on ground (negative speaker terminal).
Did you mean that you had a 50Hz sine wave or are you picking up noise from the 60Hz mains (common when fluorescent lights are nearby)?
Did you mean that you had a 50Hz sine wave or are you picking up noise from the 60Hz mains (common when fluorescent lights are nearby)?
I removed R4011 resistor. I have 50hz test tone on the resistor pad comeing from the header. The other side of the resistor pad going to pin 3 of the op-amp I do not have 50hz. I check to make shore the Trace comeing from pin 3 to the resistor r4011 is not damaged by setting the meter to continuity. It checks out good. Does this mean resistor R4011 is bad?
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