Heat dissipation from 3875

soundNERD · 18th January 2005, 10:55 PM

Has anybody else noticed that after a while the heat dissipation out of an LM3875 amp reduces a lot? I've been noticing that with my amp. at first, I was worried my heatsink wasn't big enough, but now it's running cool enough to not matter.

If anybody has noticed this, does anyone have any idea why it happens?

wigginjs · 18th January 2005, 11:13 PM

Perhaps whatever thermal interface material you used has some sort of "burn-in" period. I kind of doubt it's the chip.

soundNERD · 19th January 2005, 01:36 AM

possibly, but even the heatsink is cooler.

jackinnj · 19th January 2005, 02:03 AM

it does seem to "seat" itself thermally --

18th January 2005, 10:55 PM	#1
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	Heat dissipation from 3875 Has anybody else noticed that after a while the heat dissipation out of an LM3875 amp reduces a lot? I've been noticing that with my amp. at first, I was worried my heatsink wasn't big enough, but now it's running cool enough to not matter. If anybody has noticed this, does anyone have any idea why it happens?

18th January 2005, 11:13 PM	#2
wigginjs diyAudio Member Join Date: Dec 2003 Location: Columbia, SC	Perhaps whatever thermal interface material you used has some sort of "burn-in" period. I kind of doubt it's the chip. __________________ The Four Chairs DIY Home Theater

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19th January 2005, 01:36 AM	#3
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	possibly, but even the heatsink is cooler.

19th January 2005, 02:03 AM	#4
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	it does seem to "seat" itself thermally --

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