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Old 31st August 2012, 05:54 AM   #1
kctess5 is offline kctess5  United States
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Default Runs hot under no use

The gainclone I made (lm3875 kit) a month or two ago works perfectly, except that the left channel heatsink runs hot when the amp is not in use. It is within the thermal limit so it doesn't really cause problems I just find it odd. The amp sounds fantastic, and any noise is undetectable from the listening position.

If the amp is not plugged into my computer, but on, it heats up quite a lot. If I then plug it in and play music through it it actually cools down noticeably. The amp may be oscillating which could explain why the left channel runs hotter than the right, but it seems like that wouldn't stop when music was playing and it would just get hotter.

I know the question is coming so no I don't have an O-scope. Though I may be able to bring the amp into the physics department and use one of theirs.

Has anyone experienced this?
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Old 1st September 2012, 05:09 PM   #2
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Normally it should run barely warm, so chances are it indeed oscillates. Try to swap inputs and see what happens.
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
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Old 1st February 2015, 04:52 PM   #3
amptech is offline amptech  Scotland
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''I know the question is coming so no I don't have an O-scope. Though I may be able to bring the amp into the physics department and use one of theirs''.

if you ground its input cable and remove the speaker load does it still heat up? if so the ic might be faulty..just check cables from input to speaker o/p..
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