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Old 22nd September 2007, 09:39 AM   #1
Semir is offline Semir  Hungary
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Default LM3886 and +-42V

Hi there!


I would like to use my last amplifier's transformer for my new amplifier, which would be based on an lm3886, but that transformer gives out +-50VDC and +-41VDC.
Does any one of you have experinece with lm3886 and +-41VDc? I mean that the datasheet states +-42VDC the as the limit. Will it stand it?

Thanks!

With regards,
Semir
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Old 22nd September 2007, 10:00 AM   #2
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If this is the voltage with no load it will probably work.
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Old 22nd September 2007, 02:01 PM   #3
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Default Heatsinks

If you are driving a normal speaker, as far as efficiency and impedance this is a bit much. It looks perfect for 16 ohm speakers, gets more power output.
For normal use, try a paralleled LM3886. With 40 volt rails, you might get close to 100 watts out of it.


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Old 23rd September 2007, 06:04 PM   #4
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Sounds great to me

≈40±VDC is the right voltage to go with.
Just stay below 80VDC if you can .
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Old 23rd September 2007, 06:11 PM   #5
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You'll need big heatsinks...
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Old 23rd September 2007, 06:24 PM   #6
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Quote:
Originally posted by pinkmouse
You'll need big heatsinks...

Maybe, and maybe not. Depends on how much you drive it and what you call "BIG" heatsinks.
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Old 23rd September 2007, 07:00 PM   #7
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Put it this way, a 15cmx18cm heatsink with 3cm deep fins got warm with just the quiescent current draw on my 42V rail LM4780. And no, it wasn't oscillating.
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