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-   -   LM3886 Parallel Use (http://www.diyaudio.com/forums/chip-amps/1825-lm3886-parallel-use.html)

Rachel 10th January 2002 01:04 PM

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

AudioFreak 10th January 2002 01:14 PM

2 Attachment(s)
yep you do this ............

AudioFreak 10th January 2002 01:16 PM

the 3875 shown is a scaled down version of the 3886 and the 3886 can be placed in this circuit without any problems.

Rachel 10th January 2002 01:20 PM

Many thx. AudioFreak. Are you using DC servo for the feedback loop for each Power OpAmp module? Fantisic....

Anyway, many thx.

AudioFreak 10th January 2002 01:34 PM

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.

paulb 10th January 2002 01:50 PM

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.

AudioFreak 10th January 2002 02:03 PM

Paul that's exactly where the schematic above came from.

AudioFreak 10th January 2002 02:07 PM

http://www.national.com/appinfo/audi...ation_Note.pdf

palesha 13th January 2002 01:16 AM

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

ssanmor 25th January 2002 09:38 AM

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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