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Old 24th May 2010, 12:50 AM   #21
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It sounds like it may have an intermittently shorted power transformer.
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Old 24th May 2010, 12:57 AM   #22
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Seeing as it has stopped working again, I feel you may be right.
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Old 24th May 2010, 01:17 AM   #23
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With all power semiconductors clamped tightly to the sink and a 10 amp fuse in the B+ line, power the amp up and twist/push/pull on the transformer to see if it blows the fuse. If you have a current limiter (headlamp or large 2 ohm resistor), that would be better than the fuse. You'd have to monitor the voltage across the resistor with a meter to see if there are any changes in current draw.
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Old 24th May 2010, 02:09 AM   #24
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At the moment it won't even power up and it is getting 5v out the chip as it should so it's the +12 side that is not working properly I'd say. I dunno, about to chunk it out the window and forget it. Not worth it.

It works then don't, then works, then don't. Now nothing at all.
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Old 24th May 2010, 02:11 AM   #25
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Post the voltage on all of the pins on the 494.
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Old 24th May 2010, 03:46 AM   #26
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Actually you can hear the transformer make a tiny "tink" sound when you connect the remote. It's trying, but nothing is flowing. I think I have a bad capacitor.
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