On Monday, Mar 22, 2004, at 14:34 US/Pacific, Thomas C. Sefranek wrote:

>>
>>> Jinx, I don't know what the difference would be it I had 10V

The problem is that getting a regulated 12V out of a 12V battery is a
relatively "hard" thing, requiring a switching topology of some sort
(and IIRC, switchers are easier when the output voltage ISN'T that
close to the input voltage.)  If you could get by with 10V, you could
use two simple linear regulators (depending on other circumstances, of
course.)

Are you allowed to use, say, 14V worth of battery?  Or is the 12V
requirement loose enough that you can get by with an unregulated 12V
direct from the battery, when the main power is off?

BillW

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