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Old 10th January 2002, 01:04 PM   #1
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Default LM3886 Parallel Use

Does anyone know how to parallel the LM3886 together to increase max. output current and improve damping factor.

I do know that Jeff Rowland DG is using this approach in their amplifiers.

Many Thx.

Rachel
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Old 10th January 2002, 01:14 PM   #2
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yep you do this ............
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File Type: gif lm3875-2.gif (11.2 KB, 5537 views)
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Old 10th January 2002, 01:16 PM   #3
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the 3875 shown is a scaled down version of the 3886 and the 3886 can be placed in this circuit without any problems.
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Old 10th January 2002, 01:20 PM   #4
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Many thx. AudioFreak. Are you using DC servo for the feedback loop for each Power OpAmp module? Fantisic....

Anyway, many thx.
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Old 10th January 2002, 01:34 PM   #5
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The servos are so that you dont get a different DC offset @ each of the outputs ... you'll also probably want to add a circuit that protects the speaker from DC which is not catered for in the schematic above.
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Old 10th January 2002, 01:50 PM   #6
paulb is offline paulb  Canada
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National had a conceptual schematic as well, I have the PDF but can't seem to find it on their site anymore. Email me if you'd like me to send it to you. The title is:
Bridge/parallel amplifier (BPA-200) documentation, Sept. 19, 1997.
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Old 10th January 2002, 02:03 PM   #7
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Paul that's exactly where the schematic above came from.
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Old 10th January 2002, 02:07 PM   #8
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http://www.national.com/appinfo/audi...ation_Note.pdf
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Old 13th January 2002, 01:16 AM   #9
palesha is offline palesha  India
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Apexjr has sold parapix amps which contains two lm 3886 ic's. On his site their is lot of information available regarding lm3886. I have also used the amp. Hope this helps.
Mahendra Palesha
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Old 25th January 2002, 09:38 AM   #10
ssanmor is offline ssanmor  Spain
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I am also interested on parallel-bridging LM3886. Has anyone tried to do that? And what if you don't use servo circuits?
Please post any schematics you have.
Thanks!
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