At Sat, 02 Jul 2011 15:42:38 +0200 CentOS mailing list <centos@xxxxxxxxxx> wrote:
>
> Jason Pyeron wrote:
>
> >> Could you (or anyone) suggest a cheap UPS?
> >> This is only a tiny server (HP MicroServer) on a home LAN.
> >
> > http://www.amazon.com/APC-Back-UPS-shutdown-software-UPS-
> BE350G/dp/B001985SWW/
>
> Thanks, I'll look into that.
>
> >> I'm sure you are right, as I know nothing at all about power supplies.
> >> But surely computers actually use DC,
> >> so couldn't my torch-battery device just supply the PC
> >> components directly?
>
> > You will either need many different batteries for the different voltages
> > (1.2, 3.3, 5, 12, -12, -5) or a DC ATX power supply (not cheap and not
> > very powerful until the 48V input variety)
>
> Surely one 12v battery would do?
Actually not. You need both positive and negative voltages. You cannot
just use a 12v battery with a voltage divider resistor network. And
because the voltages needed have to be precise, you really need a
properly regulated power supply. Like Jason said, it would be a 48VDC
input unit and will cost you many times what a cheap UPS would cost.
> It is only meant to last for 30 seconds or so,
> so wouldn't reducing the voltage be easy enough?
> I repeat that I don't know what I'm talking about ...
>
--
Robert Heller -- 978-544-6933 / heller@xxxxxxxxxxxx
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