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battery as power supply

Posted on April 21, 2020 at 01:34:04

Posts: 196
Location: south france
Joined: February 28, 2015

I m doing a diy circuit to make a battery power supply for my portable cdp used as source for my home system.
The question is about the differences in quality sound I can obtain with different battery technologies....
A well reputed CD tweaker told me several years ago that traditional lead acid ones sounded better than gel ones...
Lastly somebody told me that he had very good results with lithium polymer ones...
Did you have advice about it?
Thank you: David


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RE: lead acid, posted on April 22, 2020 at 05:33:26

Posts: 9249
Location: Greenville SC
Joined: February 25, 2007
I can't comment on the "sound" of various battery technologies, since I've never tried anything but lead acid types. I was using two 12 volt lead acid motorcycle batteries in series to power my 24 VDC phono stage. I placed a (pre-charged to correct voltage) 54,000 F capacitor across the battery terminals, and the sound improved.

Apparently at least some types of batteries (including lead acid) generate noise as they discharge, which would explain why the capacitor improved the power supply.


RE: battery as power supply, posted on June 7, 2020 at 22:49:00
Industry Professional

Posts: 73
Location: New York
Joined: November 2, 2012
December 0, 0000
If the CDP is susceptible from any noise on the DC supply voltage, then it's doggy-doodie. Battery discharge noise is so minuscule, any simple filter capacitor could totally eliminate it. If the CDP doesn't have a simple filter cap on the DC input it's a badly designed unit, and most likely will be much more susceptible to other noise on the DC than simple discharge impulses.


RE: battery as power supply, posted on July 8, 2020 at 20:38:04

Posts: 469
Location: Vancouver Island
Joined: January 27, 2009
I'd expect most cd portables have regulated power supplies to keep motor and servo noise out of the audio. If the cdp runs from two AA cells, a single LiFePO4 cell would be a good match.


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