That is probably a wrong analysis of the problem. Many higher power supplies like AT/ATX power supplies don't work properly when unloaded. I bet if you draw a couple of amps from the +5V supply, you would find that the +12V supply starts working fine.
I used to use car headlights to provide enough load when debugging systems which weren't loaded enough to maintain regulation. Cheers, wad On May 13, 2010, at 5:43 AM, Sascha Silbe wrote: > On Thu, May 13, 2010 at 06:44:34PM +1000, James Cameron wrote: > >> An ATX or AT switch-mode power supply attached to a set of nine laptop >> charging cables. The power supply is being used as a 12V DC regulated >> source. The original PC power harness cables have been removed. > FWIW, I've also used a ATX power supply to power an XO-1, but stopped doing > so once I discovered why the XO-1.5 would run from it: Being a cheap model, > it regulated only the 5V rail, so the 12V rail dropped down to 9V with a > switched-on XO-1 connected to it. The XO-1 barely coped (the power light > started flickering some time ago, probably due to the power supply aging and > delivering an even lower voltage than before) and the XO-1.5 (without MPPT > ECO) didn't like it at all (whining noise, LED off). > > Summary: If you're trying to replicate this setup, make sure your PC power > supply regulates the 12V rail (just hook up some load and check the voltage). > > CU Sascha > > -- > http://sascha.silbe.org/ > http://www.infra-silbe.de/_______________________________________________ > Devel mailing list > Devel@lists.laptop.org > http://lists.laptop.org/listinfo/devel _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
