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Old 17th November 2008, 01:58 PM   #1
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Join Date: Oct 2004
Default lm4780 Class A headphone amp

I got a bunch of lm4780 in a trade,now I'm trying to find something to to with them. Because of the small"est" heat transfer area,I want to stay away from anything high powered,so a headphone amp comes to mind.
I want to make it fairly simple,maybe a 4780 in the feedback loop of a smaller op amp(class A biased) or maybe run just the 4780 into class A and deal with the high gain some other way.

Any Ideas would be helpful.
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Old 17th November 2008, 04:41 PM   #2
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Join Date: Aug 2008
The heat isn't as much of an issue as you would think for "normal" music listening. I have an amp that consists of a pair of LM4780s running in bridged mode at 25V (approximately 100W each). Both channels are sharing a heatsink mounted inside my enclosure and cooled without a fan, and it doesn't change temperature noticeably between idle and "normal" listening levels (about 40 C).
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Old 17th November 2008, 06:36 PM   #3
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Join Date: Oct 2004

What size are your heatsinks? So,a class A headphone amp should do fine with a small heatsink.

I tried a google search but I got nothing.
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Old 17th November 2008, 08:59 PM   #4
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It's about 5cm x 5cm x 20cm. There are only about 25 fins.
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