LM3886 Parallel Use

Rachel · 10th January 2002, 01:04 PM

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

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!

10th January 2002, 01:04 PM	#1
Rachel diyAudio Member Join Date: Jan 2002 Location: Hong Kong	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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10th January 2002, 01:16 PM	#3
AudioFreak Warp Engineer On Holiday Join Date: Oct 2001 Location: Queensland, Australia	the 3875 shown is a scaled down version of the 3886 and the 3886 can be placed in this circuit without any problems.

10th January 2002, 01:20 PM	#4
Rachel diyAudio Member Join Date: Jan 2002 Location: Hong Kong	Many thx. AudioFreak. Are you using DC servo for the feedback loop for each Power OpAmp module? Fantisic.... Anyway, many thx.

10th January 2002, 01:34 PM	#5
AudioFreak Warp Engineer On Holiday Join Date: Oct 2001 Location: Queensland, Australia	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.

10th January 2002, 01:50 PM	#6
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	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.

10th January 2002, 02:03 PM	#7
AudioFreak Warp Engineer On Holiday Join Date: Oct 2001 Location: Queensland, Australia	Paul that's exactly where the schematic above came from.

10th January 2002, 02:07 PM	#8
AudioFreak Warp Engineer On Holiday Join Date: Oct 2001 Location: Queensland, Australia	http://www.national.com/appinfo/audi...ation_Note.pdf

13th January 2002, 01:16 AM	#9
palesha diyAudio Member Join Date: Nov 2001 Location: Pune India	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

25th January 2002, 09:38 AM	#10
ssanmor diyAudio Member Join Date: Jan 2002 Location: Madrid	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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