Do a power budget for each rail (3V3, 5V and 12V) and see what you need. If the xenarc is 12V only in then all you need is one of the 12V carnetix, if not you need so hook up a full atx style (opus or M1). I would still go M1 though on a 1.3 unless it is a mobile or low voltage version.
I looked at the carnetix 1260 but the relay issue and in-line fuses confuses me a bit.
OMG! learn then!
whatever setup you use it is likely you wil have to use a relay and defintely an inline fuse (on the +ve lead as close to the battery as possible - if i had a £1 for everytime i have said that i would be rich).
here is what you need to do:
1. find out if the Xenarc is 12V only input (ie has its own dc-dc converters built in to generate the 3v3 and 5v lines)
2. find out how much power it needs - the xenarc site should tell you
3. find out how much that 1.3ghz p3 needs
4. list what drives you are using - ie 3.5" hdd or 2.5", full size DVd or slim laptop DVD.
if the 60W is total than you should get away with the Carnetix guess. have a look at what other people are using to power their xenarc PCs. If you get the carnetix with the extra 5V rail it will be perfect for powering your USB devices however you will have to find another 12V suppy for your screen.
I have to regualte that too? Moreso than the egg provided?
Well the Xenarc has the sumicom board and that's what a guy from Carnetix said is the better bet unless I can get teh Opus and power the screen and PC both from the OPUS 90W. Hence why I initially thought the 150W may be ok but possibly overkill.
99 Grand Prix Grand Tigress HW
Liliput 8in TS
845GVD MITX w/ 2.4 Mobile P4M (478 MB)
60GB 2.5" HDD
MS MN-710 WifiG
BT Deluo lite GPS
IrDa PS/2 Keyboard SW:
Win XP SP2
Zots day skin
it is an 80W opus 12V psu. It wont have a 5V line for your GPS but it should be ok off the PCs USB. The 80W will be ok for your CP with a bit of margin and you could also possibly have enough left over to power the screen.
There have been problems with eggs on screens but by all means try it.