I’m not following what you’re saying.
You asked me to put the black probe on the non-bridging terminal, which I understand to be the common bussbar between the two channels. This makes sense to me, since it’s the common point of the secondary of the power supply.
Next you said check the range of the offset pots while reading pin 3 on the driver cards, and I noted a range of -6 to +15mv with the positive probe there.
So I don’t understand what you mean when you say how could it go to 15 if it’s -3, both cards do the same thing when reading pin 3. Did you mean read the output terminal instead???
I’m lost.
You asked me to put the black probe on the non-bridging terminal, which I understand to be the common bussbar between the two channels. This makes sense to me, since it’s the common point of the secondary of the power supply.
Next you said check the range of the offset pots while reading pin 3 on the driver cards, and I noted a range of -6 to +15mv with the positive probe there.
So I don’t understand what you mean when you say how could it go to 15 if it’s -3, both cards do the same thing when reading pin 3. Did you mean read the output terminal instead???
I’m lost.
If you have -3mv on the input pin and the offset can drive it more, why don't you set it as far as it can go to get rid of the offset at the speaker output?
What are the positive and negative regulated supply voltages on the op-amps? Use the non-bridging terminal for the reference.
What are the positive and negative regulated supply voltages on the op-amps? Use the non-bridging terminal for the reference.
Um, because it doesn’t get rid of the offset no matter how far I turn it?
On the bad channel the pot will only vary it from -1.7 to -1.5v at the output terminal, good channel works like I’d expect it to passing through 0 and varying positively or negatively like it should.
On the bad channel the pot will only vary it from -1.7 to -1.5v at the output terminal, good channel works like I’d expect it to passing through 0 and varying positively or negatively like it should.
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