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Chip Amps Amplifiers based on integrated circuits

Parallel Chip Amps on Ebay, Adjust for offset
Parallel Chip Amps on Ebay, Adjust for offset
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Old 15th March 2012, 03:09 PM   #1
Mikett is offline Mikett  Canada
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Join Date: Aug 2003
Location: Toronto
Default Parallel Chip Amps on Ebay, Adjust for offset

I am looking at getting a triple parallel assembled chip amp from Ebay to drive a subwoofer for a HT. I am currently using a single 3886 on a 4ohm sub.

On the pictures of the boards, there are three trim resistors. I imagine those are to null the offset voltages. My question is how is that done when there are three chips already on the board. I would think it is not easy.
Anyone have experience nulling the parallel arrangement?

LM3886 3 159W Parallel Mono Channel Amplifier Board | eBay

LM3886 X3 parallel Power Amplifier board 150W Assembled | eBay
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Old 16th March 2012, 09:27 AM   #2
bcmbob is offline bcmbob  United States
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Join Date: Dec 2009
Location: Bay City, Michigan
Here is a link to one post on the subject. The entire thread has lots of great info on the many uses of this design including whether it's a good choice for a sub amp.

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