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Old 27th January 2006, 09:28 PM   #1
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Unhappy lm3886 didn t work :(

hi ..
i just build a lm3886 base , guitar amp from : http://www.generalguitargadgets.com/...185&Itemid=210

but when i test it for the first time it didn t work ,,when i turn it on it s a very loud noise come out of speaker, and the ic become too hot ,( even w heatsink ) i check all the board again and again .,,checked the power supply , everythin seems w no problem ... s there any problem w original schematic and pcb ???
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Old 28th January 2006, 05:26 AM   #2
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The design looks fine to me, more or less the reference design from National Semiconductor. Can you post pictures of your amp? Probed around (cautiously) with a multi-meter?

Good luck
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Old 28th January 2006, 05:36 AM   #3
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Add a zobel filter.
This will prevent oscillation.

You put a 10 Ohm resistor in series with a 100nF film cap.

This you solder across the output pins of PCB.

out+terminal
R10 Ohm
C 100nF
out-terminal
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Old 28th January 2006, 08:26 AM   #4
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hi ... i m a very newbie for electronic , i can t test it too much , but i did anythin i could .. but nothin ,, the only thing i can think s the ic was dead already when i bought it ...
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Old 28th January 2006, 08:27 AM   #5
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another
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Old 28th January 2006, 08:28 AM   #6
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sorry the pics has no quality ..
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Old 28th January 2006, 09:11 AM   #7
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i forgot to say i m usin -24/+24 for supply
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