What happens if the battery supply is off balance ?

Will · 6th October 2006, 06:48 AM

I have plans to power up my 3875's with 4xSLA 12v in balanced mode, i.e. +/- 24 supply. What would happen if lets say, one side of the battery (in the long run) sags, making the voltage off balance by 1 volt or more ? Will it burn my speakers ?

regards,
Will

Ouroboros · 6th October 2006, 07:05 AM

There is dc feedback as well as ac feedback from the output, so the dc offset at the output will allways be controlled and it won't be a problem. The amp will still work with (say) +20V and -24v, but obviously it will clip asymetrically.

Will · 6th October 2006, 08:04 AM

Thanks, that's comforting to know. I also plan to have a battery indicator for both sides of the supply, and most likey will not run off by more than 2v with manual observation.

cheers..

SpittinLLama · 6th October 2006, 04:39 PM

It will be fine. I ran a LM3886 with a +6V and -10V to run it down to 16V supply (the cut offs are asymmetrical) and there is no increase in DC offset. You wil be fine.

-SL

6th October 2006, 06:48 AM	#1
Will diyAudio Member Join Date: Sep 2001 Location: Kuala Lumpur	What happens if the battery supply is off balance ? I have plans to power up my 3875's with 4xSLA 12v in balanced mode, i.e. +/- 24 supply. What would happen if lets say, one side of the battery (in the long run) sags, making the voltage off balance by 1 volt or more ? Will it burn my speakers ? regards, Will

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6th October 2006, 07:05 AM	#2
Ouroboros diyAudio Member Join Date: Dec 2003 Location: Nottingham UK	There is dc feedback as well as ac feedback from the output, so the dc offset at the output will allways be controlled and it won't be a problem. The amp will still work with (say) +20V and -24v, but obviously it will clip asymetrically.

6th October 2006, 08:04 AM	#3
Will diyAudio Member Join Date: Sep 2001 Location: Kuala Lumpur	Thanks, that's comforting to know. I also plan to have a battery indicator for both sides of the supply, and most likey will not run off by more than 2v with manual observation. cheers..

6th October 2006, 04:39 PM	#4
SpittinLLama diyAudio Member Join Date: Apr 2005 Location: In the Wild, Wild West	It will be fine. I ran a LM3886 with a +6V and -10V to run it down to 16V supply (the cut offs are asymmetrical) and there is no increase in DC offset. You wil be fine. -SL