sparcmx

The step down board is 'just' adequate to power the unit, I ripped mine out and now power the 760 with an 400w ATX PSU, it's ugly yet robust and quiet. Don't be fussy about the case fan, the motherboard generates bugger all heat and the hdd is happily passive cooled through the metal case. And just for fun, I ripped that stupid piezo out with pliers, damn alarm, pointless for my application.

I know this thread is old, but hey, I found it and it got me started, so here's the rest. You can use a pc ATX psu, using the 24pin motherboard connector, cut the green wire and a black earth wire and connect those to jump start the psu (don't run it without a device attached, high resistance will cook it in minutes). Red wires are 5v, connect to pin 9 and 10 Orange wires are 3.3v, connect to pins 1,2,3,6,7,8 Obviously use one of the hdd connectors for the drive. Now time to find a place to put the Dvr with a dirty big psu lumped on top, good times.