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 Post subject: build a psu?
PostPosted: Fri Nov 08, 2002 9:55 am 
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Joined: Fri Nov 08, 2002 9:27 am
Posts: 16
I was searching a totally silent power supply (atx for my pc), when I thougt that it could be possibly done combining these together:

http://www.kepcopower.com/rkwo.htm

do you think that it is possible? can it be done in another way, with other components?

if a power supply is rated for example 12v, does it mean that the same units outputs at the same time + and - 12?

thank you very much for any suggestion


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 Post subject:
PostPosted: Fri Nov 08, 2002 12:27 pm 
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Joined: Sun Aug 11, 2002 3:26 pm
Posts: 11943
Location: Vancouver, BC, Canada
Possibly, but it sounds unduly complex. Dou you want to DIY or just want a fanless? There are a couple listed in the Recommended PSU page.


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 Post subject:
PostPosted: Fri Nov 08, 2002 1:51 pm 
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Joined: Fri Nov 08, 2002 9:27 am
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I think that it is a good idea becouse the fanless psu that currently available, are very expensive, and have limited power (in fanless mode)

for example I don't think that a tkpower/ rsg psu can be used for a p4!

anyway open frame power supply often miss some important things: pfc, thermal shutdown etc.

don't know if someone has the expertise to do it ....


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 Post subject:
PostPosted: Fri Nov 08, 2002 1:52 pm 
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Joined: Fri Nov 08, 2002 9:27 am
Posts: 16
I think that it is a good idea becouse the fanless psu that currently available, are very expensive, and have limited power (in fanless mode)

for example I don't think that a tkpower/ rsg psu can be used for a p4!

anyway open frame power supply often miss some important things: pfc, thermal shutdown etc.

don't know if someone has the expertise to do it ....


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 Post subject:
PostPosted: Sat Nov 09, 2002 1:16 am 
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Joined: Sun Sep 29, 2002 9:05 pm
Posts: 228
Location: Powell River, BC, Canada
Any PSU will be rated for exactly the voltages it puts out. If it says 12, it means +12, not +12 & -12. Too bad. The -12 would be a whole extra circuit, and you don't get anything for free. Lots of times you see 'single output' 'dual output' '3 output' ... but they seldom list more than 5 output units. Each voltage, + or -, is one output. So a +12/-12 is a dual output.

Then there's -5. It is missing from some ATX PSU's these days, is almost never used, but it's still listed in the ATX standard. You don't really need it, so they don't put it in. They still call it an ATX PSU though.

You also want to figure out a 5v standby too. Just one more little pain.

The hardest part of making a supply from several smaller ones is high power 3.3v. I don't see many cheap generic 3.3 supplies around. Just 12's and 5's.

There would be a big market for a normally priced 10v-18v (12v battery) powered ATX. The companies that do make them either don't get a good deal, or charge too much. I wonder if they made them cheaper to reach the street PC market they might sell 10 times as many. I would buy 2 of them tomorrow if they were good quality and only cost $50. Maybe they are out there though. We should all keep a lookout.


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 Post subject:
PostPosted: Sat Nov 09, 2002 3:41 am 
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Joined: Fri Nov 08, 2002 9:27 am
Posts: 16
here there are tons of addresses

http://www.linux-1u.net/PowerSupp/1U.Power.txt

I will try to look

tell me if you find something interesting

bye


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