Is LM3875 Bombproof? - diyAudio
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Old 17th April 2012, 08:43 PM   #1
Puffin is offline Puffin  United Kingdom
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Default Is LM3875 Bombproof?

I ask because I blew one up a few years ago. I was clumsy with my DMM probes and ( I think) shorted v- and 0v.

I recently re-built both mono amps as I wanted to increase the heat sink size and make them look pretty

I again (yea, ok) bridged the v- and 0v on one = chip dead.

The datasheet says "output protection from a short to ground or to the supplies via internal current limiting circuitry"

Should it blow up so easily?
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Old 17th April 2012, 09:41 PM   #2
Boscoe is offline Boscoe  United Kingdom
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But if your shorting v- to 0v your just shorting the PSU. It's most probably the rail inbalance that destroyed your chip. Or you shorted something else.
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