I bought a DV1175 summing amp but after a first test there is only very low output (40 or 50dB less than the input signal) and no bass in the output signal on both channels.
For the test I connected my converter output to the "Eingang entkoppelt" and the output of the amp to the converter input. When tracing the signal with an oscilloscope the last point I can measure the signal is the inverting input of the first opamp (pin 7), there is no output on pin 10.
This would tell me that the first NE5533AN is the problem, BUT both channels have the same problem and the bass roll off is already measurable on the input of the chip - which makes a faulty chip unlikely.
Does anybody have another idea what might be the problem?
I don't have the chips here so I can't just throw in a new one and see.
Voltages are fine btw....
For the test I connected my converter output to the "Eingang entkoppelt" and the output of the amp to the converter input. When tracing the signal with an oscilloscope the last point I can measure the signal is the inverting input of the first opamp (pin 7), there is no output on pin 10.
This would tell me that the first NE5533AN is the problem, BUT both channels have the same problem and the bass roll off is already measurable on the input of the chip - which makes a faulty chip unlikely.
Does anybody have another idea what might be the problem?
I don't have the chips here so I can't just throw in a new one and see.
Voltages are fine btw....