check out TI's line of ISR  integrated regulators- seem to be able to
handle the voltage dip
(this may not be the right one for you) example pt6620

At 02:35 AM 7/18/03 -0700, you wrote:

>On Fri, Jul 18, 2003 at 10:29:46AM +0100, Peter Moreton wrote:
> > A bit off-topic, but I'll ask anyhow: I have been asked to come up with
> > a vehicle 'mini-UPS' design
>
>Don't car audio enthusiasts just use large caps for this (and to absorb
>the power drain of big bass hits)?  Just make sure that it's on the
>receiving end of a diode so you don't drain it to power the starter.
>
>--
>Ben Jackson
><ben@ben.com>
>http://www.ben.com/
>
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