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Old 30th January 2009, 04:46 PM   #11
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Quote:
Originally posted by Atilla
A minute or two of testing won't cook them though.
..as long as you don't crank it up too much. Those ICs come with a good protection system built-in. And that is the point. When the protection system switches the amplifier off too often, it becomes a nuisance.
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Old 11th March 2013, 08:41 AM   #12
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Originally Posted by pacificblue View Post
Remember also that there will be ~55 W to dissipate with those rails and 4 Ohm speakers. The LM3886TF has a thermal resistance of 2 K/W, hence will be 110 K hotter than the heatsink.

With 8 Ohm speakers all will be well.
been using mono lm3886tf on very small heatsink and 4 ohm speaker on 38.5v rails ,i think 200va toroid maybe more,, spike is heard after few minutes on max volume but not gonna burn lm no matter how hard i try to burn it..i think
voltage drop kills it when people take 120va trafo on ab class amp almost 70 watts rms

sry on bad langugage

edit:and sorry i didnt saw 2009 year

Last edited by tonitonitoni; 11th March 2013 at 08:42 AM. Reason: its morning
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Old 14th March 2013, 03:44 PM   #13
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I've got parts for a lm3886 gainclone too. I was thinking of mounting the lm3886 directly to the bottom of a rather large case. How hot do these things get?
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Old 15th March 2013, 06:41 AM   #14
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It will work ok on the case, but see that you mount these not too close, so that the case is shared individually by each IC. The ICs should be isolated from the case metal if you have the non-isolated version.

Moreover if things start getting too hot, the SPIKE protection in the chip will kick in, which you will hear as distortion.

Gajanan Phadte
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Old 15th March 2013, 01:23 PM   #15
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Thanks. I'll isolate each chip from the case. I might even use a piece of copper between the case and chips.
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