I have just got one channel of my gainclone working. I have built it as a single supply so it has input and output blocking caps. I have a loud hum problem. I have tried single star grounding and I have tried double star grounding. In the double configeration I have all the grounds attached to one point, excepting the input grounds and the feedback loop ground.
Here is the strange thing, I attached my digital multimeter on continuity test between the output side of the output blocking cap and ground and the hum goes away. Is this a pointer to the source of the problem and if so what is it.
Shoog
Here is the strange thing, I attached my digital multimeter on continuity test between the output side of the output blocking cap and ground and the hum goes away. Is this a pointer to the source of the problem and if so what is it.
Shoog
can you post your amp's shematic?
I don't exactly see how you builded it, and why you use an output cap
I don't exactly see how you builded it, and why you use an output cap
It is the standard single supply circuit.
It is the standard single power supply circuit given on the LM1875 data sheet.
Shoog
It is the standard single power supply circuit given on the LM1875 data sheet.
Shoog
The signal was still there
The signal was still there so I dont think a short circuit would explain it.
Shoog
The signal was still there so I dont think a short circuit would explain it.
Shoog
Hmm...what happens if you tie the output side of the output capacitor to ground via ~100k-1M resistor? This shouldn't make a difference, but maybe a DC ground point at the amplifier side is helping for some reason.
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