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Chip Amps Amplifiers based on integrated circuits

I can't win this noise.
I can't win this noise.
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Old 28th January 2012, 02:35 AM   #1
jinkuchi is offline jinkuchi  Japan
diyAudio Member
Join Date: May 2004
Location: shinjuku
Default I can't win this noise.

LM 3886 typical circuit. plus optional components in datasheet.

some day the noise come from electric motors from AC line.
in 9.30 AM some day about 10 min and it gone.
There are many industries or wood crafting around here.

I try every thing.
not work.

Japanese AC line noise filter
small c input to ground
small c input+ , - of the ic.

event I turn volume to ground it still noise.
volume is ALPS made in Japan.

I attach the noise I record from speaker. up volume 300%.
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Old 28th January 2012, 03:03 AM   #2
djoffe is offline djoffe  United States
diyAudio Member
Join Date: Oct 2008
please post your schematic...everyone has a different idea of "typical".
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Old 30th January 2012, 04:49 AM   #3
gmphadte is offline gmphadte  India
diyAudio Member
Join Date: Jul 2003
Location: Dona paula, Goa
Is your assy inside a metal chassis or open.

Gajanan Phadte
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Old 30th January 2012, 07:33 AM   #4
madtecchy is offline madtecchy  England
diyAudio Member
Join Date: Dec 2010
Location: wigan
just start listening at 09:40. then no noise to filter.

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