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Old 3rd June 2009, 04:17 AM   #1
riaz is offline riaz  Philippines
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Join Date: Apr 2006
Location: philippines
Question Lm3886 Help!

Hello all,

I need help in troubleshooting my amp please, kindly help me find out what's wrong with my amp because when i tested it to a speaker the sound that comes out is attenuated and then disappears and reappears back again after a short while. This action gets repeated over and over. What should i be aware of guys?

Equipment used:
Rotel ra-02 as preamp
LM3386TF Amp is based on "A minimalistic chip amplifier" by Mick Feuerbacher http://tinyurl.com/3resamp
Tested to a single 4 ohm woofer
Power supply: 220v ac/ 18vdc, bridge rectifier, and 2 cans of 15,000 uf caps
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Old 3rd June 2009, 08:42 AM   #2
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Join Date: May 2008
Default Re: Lm3886 Help!

Quote:
Originally posted by riaz
sound that comes out is attenuated and then disappears and reappears back again after a short while. This action gets repeated over and over. What should i be aware of guys?
DC at the output, heatsinking, shorts and bad solder joints.
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