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Old 28th August 2012, 02:03 PM   #1
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Default Psu / battery recharging

I've got an ak4396 dac that is being powered by a 12v dc supply. I'm also considering using a 12v dc battery to power the dac.

I was thinking of redirecting the on board psu to recharge the battery instead of supply the dac directly.

Is it ok to recharge the battery while powering up the dac with the same battery?
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Old 28th August 2012, 03:18 PM   #2
Davey is offline Davey  United States
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You could possibly do that, but there are some issues.

Firstly, a 12vdc supply is not high enough voltage to fully charge a standard lead-acid battery.
You'd need to implement a steering diode configuration so the two supplies don't "conflict."
You'd need to add a current limit resistor across the battery diode to allow charging when the DC supply is on.
....
....

I'll probably get stoned by I don't see the point in using battery supplies...unless it's for portable usage. Battery supplies are "designed" by guys who don't have the expertise to design a proper AC supply.

Cheers,

Dave.
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Old 28th August 2012, 03:23 PM   #3
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Davey View Post
............. Battery supplies are "designed" by guys who don't have the expertise to design a proper AC supply.
I like this, probably not true, but it sounds good.
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Old 28th August 2012, 03:47 PM   #4
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I was going to use a switch between the two supplies. I think that would work.

I'm not sure about over charging the battery.
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Old 29th August 2012, 07:57 AM   #5
AndrewT is offline AndrewT  Scotland
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set your voltage regulator to the maximum stated in the battery specification. Remember to correct for temperature. This will almost certainly require the regulator to be set low.
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