4v dc offset

xplod1236 · 23rd April 2004, 01:05 AM

How can I get rid of a 4v dc offset on a lm3886?
I have built a 4 channel amp with the lm3886s, and only one puts out dc. When I give it a signal and turn it up, it works, but it still puts out 4v dc.
All the chips are connected the same way, and 3 of them work correctly.
What can I do to get rid of the offset?

roibm · 23rd April 2004, 01:21 AM

if everything else is the same, it may be a bad chip. try to change it.
try to put some of the other 3 chips in it's place for confirmation.

Nappylady · 23rd April 2004, 06:24 AM

Watch out for small pieces of metal connecting things that shouldn't be connected, and look out for bad solder joints.

I just took apart an old amp that had +V on the output, and looking closer, found that a *TINY* piece of copper wire had landed between the +in and +V rails while I was soldering it, botching the whole thing...

*sigh*

23rd April 2004, 01:05 AM	#1
xplod1236 diyAudio Member Join Date: Dec 2003 Location: On the couch	4v dc offset How can I get rid of a 4v dc offset on a lm3886? I have built a 4 channel amp with the lm3886s, and only one puts out dc. When I give it a signal and turn it up, it works, but it still puts out 4v dc. All the chips are connected the same way, and 3 of them work correctly. What can I do to get rid of the offset?

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23rd April 2004, 01:21 AM	#2
roibm Banned Join Date: Dec 2003 Location: Transylvania	if everything else is the same, it may be a bad chip. try to change it. try to put some of the other 3 chips in it's place for confirmation.

23rd April 2004, 06:24 AM	#3
Nappylady diyAudio Member Join Date: Feb 2003 Location: Salt Lake City	Watch out for small pieces of metal connecting things that shouldn't be connected, and look out for bad solder joints. I just took apart an old amp that had +V on the output, and looking closer, found that a TINY piece of copper wire had landed between the +in and +V rails while I was soldering it, botching the whole thing... sigh

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