both driver cards are the same in either side the output remains the same. a high pitched sqeal emittits overtop the audio. regulated voltage is good no opamps seems to be heating up. One of the 33uF 200 NP caps seem to be getting hotter than the other. there is
-0.055vdc at the speaker terminal
-0.055vdc at the speaker terminal
Are you saying that with no power applied that the cap itself is making a noise?
I'm not sure that I understand #9. If you're asking where to ground your scope, leave its ground connected to the 12v power supply ground unless you have a reason to use a different ground (rare).
I'm not sure that I understand #9. If you're asking where to ground your scope, leave its ground connected to the 12v power supply ground unless you have a reason to use a different ground (rare).
Yes perry the cap was making a sizzling scary type noise so I pulled them again. And now they are failed, they were also damaged badly at the initial year down but tested within tolerance so I reused them until I could find replacements. I am having a difficult time finding non-polar 33uF 200v replacements.
With the caps in place, you should have rail-rail oscillation on one terminal of each inductor and essentially nothing (but audio) on the other terminal.
If you connect a dummy load between the cap and inductor, you may be able to see far more noise on one inductor than on the other.
If you connect a dummy load between the cap and inductor, you may be able to see far more noise on one inductor than on the other.
Compare the readings in the board with the filter caps out of the circuit. If you remove them, you may break any intermittent short and they may appear to be OK.
You can also install the filter caps with a current limiting resistor in series with one terminal of the cap and compare the voltage across the limiter, one side to the other to see if they're the same.
You can also install the filter caps with a current limiting resistor in series with one terminal of the cap and compare the voltage across the limiter, one side to the other to see if they're the same.
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