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27th January 2006, 09:28 PM
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#1 |
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diyAudio Member
Join Date: Jul 2004
Location: Kayseri/Turkey
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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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Marge, don't discourage the boy! Weaseling out of things is important to learn. It's what separates us from the animals! Except the weasel. 
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28th January 2006, 05:26 AM
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#2 |
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diyAudio Member
Join Date: Jan 2005
Location: Issaquah, WA
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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 -Velmeran42 |
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28th January 2006, 05:36 AM
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#3 |
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diyAudio Member
Join Date: Dec 2005
Location: the north
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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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lineup |
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28th January 2006, 08:26 AM
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#4 |
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diyAudio Member
Join Date: Jul 2004
Location: Kayseri/Turkey
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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 ...
__________________
Marge, don't discourage the boy! Weaseling out of things is important to learn. It's what separates us from the animals! Except the weasel.
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28th January 2006, 09:11 AM
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#7 |
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diyAudio Member
Join Date: Jul 2004
Location: Kayseri/Turkey
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i forgot to say i m usin -24/+24 for supply
__________________
Marge, don't discourage the boy! Weaseling out of things is important to learn. It's what separates us from the animals! Except the weasel.
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