31 Jul
2001
31 Jul
'01
6:26 a.m.
--- Bill Bradford <mrbill(a)mrbill.net> wrote:
On Tue, Jul 31, 2001 at 07:00:01PM +0000, wanderer
wrote:
P = IE - Power == Amps x Volts
A 300W PC PSU will pull up to ~3A @ 110V, and will produce something less
than 60A of the various DC voltages due to loss to heat. He means
25-30A @ +5VDC.
Some PSUs list on the side of the enclosure what the max draw is at a
particular voltage. Older supplies were beefier at +12VDC because of
full-height disk drives. Now, +5VDC and +3.3VDC are what the chips want;
the disk drive is <20W of +5VDC and +12VDC combined.
Would it be worth protecting the PSUs from each other through a high-power
diode? The worry is that if one goes south, it'll take the rest (and
the machine) with it.
-ethan
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Since the two bulk supplies are having 8
H744's (25A versions) I was
just wondering about the feasebility of replacing them with standard
PC XT power supplies (just for the 5V), as the usually deliver also
between 25A and 30A, depending on the model. The large transformer in
the bulk supply will then be replaced with a smaller transformer to
deliver the LTC, DCLO, ACLO and +15V via the power monitor module
which is still there.
How can a normal PC XT power supply deliver 25-30A, when its plugged
into a normal 15A wall socket? Or is the amperage way different in
the UK?