On Fri, 30 Aug 2002 10:14:18 -0400, Pic Dude wrote:

>I need to build a power-supply to run a PC in a car, so I'm
>trying to figure out why I really need +/- 12V, which may be
>tough to produce with the ignition off (not enough overhead
>for the regulator).

Speaking of regulator overhead, the "ignition off" condition isn't the
lowest voltage that you're going to have to be able to deal with.=20

During cranking, your battery voltage can drop *significantly* below
nominal. (A weak or old battery can drop even further than a new one
will. Cold-weather starting can also worsen the situation.)


Regards, Bob

<snip>

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