Evan Carew wrote:

board. Since most of the important voltages going into an ATX board are
either 5V or 12V, why aren't you simply using regulators off the plane's
battery to supply the power? It would seem to me to be both cheaper as
well as inherently less noisy (not to mention lighter). You wouldn't
even have to do any special parts sourcing on these regulators as they
are redily available at you local radio shack (karmic regulators anyone?).


You still need the minus voltages hence probably still an inverting power
supply.


I'd try mounting both in the same case for starters filtering the input 12v
supply and see where you need to go from there.
John