OT question for electronics wizards

From: jpero_at_pop.cgocable.net <(jpero_at_pop.cgocable.net)>
Date: Mon Dec 21 16:56:45 1998

> Date: Tue, 22 Dec 1998 03:32:19 +0000 (GMT)
> Reply-to: classiccmp_at_u.washington.edu
> From: ard_at_p850ug1.demon.co.uk (Tony Duell)
> To: "Discussion re-collecting of classic computers" <classiccmp_at_u.washington.edu>
> Subject: Re: OT question for electronics wizards

> >
> > Hi. Just a quick question which is kind of off topic - with switched power
> > supplies like those in modern PCs, when it says the input current is 7 amps at
> > 115 volts, is that the constant no matter how much the computer itself draws,
> > or the maximum, no matter what? If it's the latter my computer room is
>
> No, it's the maximum current that the supply could draw if all the
> outputs (probably including the mains output to the monitor) are fully
> loaded.
>
> With less load, the input current will also be a lot less.
>
> -tony

Don't forget these PSU's is still appox 65% efficient conversion
to supply up to 235 watts worth on output means shows 387.8W on input
side. I could be wrong and show me correct way to calcalute this?

Don't forget that newer drives power draws are creeping up yearly. I
noticed when I was looking to see how low is low power hd at active
and in ldling (ready, spinning, all chipsets powered.)
Appox 10~13W is not too far off mark.

Oh, the PII and K6-2, future K7 are drawing so much that I notice the
vast heat output from the exhaust fan on PSU's.
Nearly barely lukewarm (trepid) on these Pentium and below.

Don't some special or vendors who makes power supplies better than
80% efficient?

email: jpero_at_cgocable.net
Pero, Jason D.
Received on Mon Dec 21 1998 - 16:56:45 GMT