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Looking for Knowledge
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PSU w/out board

Sat Jan 02, 2010 8:01 pm

Playing with a smoking room vent fan idea. How can I get a PSU to power fans without hooking up to a board?

I know some of you gerbils have an easy fix. :wink:
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Mentawl
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Re: PSU w/out board

Sat Jan 02, 2010 8:03 pm

Connect the green wire on the 24 pin ATX connector to any of the black ground wires. :)
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mattsteg
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Re: PSU w/out board

Sat Jan 02, 2010 8:07 pm

http://www.mbeckler.org/powersupply/

The main thing to be sure of is that you always have some sort of load.

Another possibility would be to use a wall-wart or similar PSU. They're silent, reliable, compact, etc. Just find one that puts out 12VDC (or slightly lower if you want to run fans at a slightly lower voltage, flow, and noise level) and can supply enough amps. I keep all of mine around if whatever they belong to dies so I can scrounge them up at times like this.
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Re: PSU w/out board

Sat Jan 02, 2010 8:20 pm

mattsteg wrote:
http://www.mbeckler.org/powersupply/

The main thing to be sure of is that you always have some sort of load.


Would 4-6 case fans be enough load?
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Re: PSU w/out board

Sat Jan 02, 2010 8:32 pm

Looking for Knowledge wrote:
mattsteg wrote:
http://www.mbeckler.org/powersupply/

The main thing to be sure of is that you always have some sort of load.


Would 4-6 case fans be enough load?

Yup. Just make sure they're always connected. If you try to e.g. turn on the psu and then hook up the fans it won't work.
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Re: PSU w/out board

Sat Jan 02, 2010 11:17 pm

I'm using a wall-wart power supply in my living room to power some mood-lighting. It is nice because it has a switch to adjust the voltage which allows varying brightness on the lights. I would think the same concept would work well for a 12v fan system. You could turn the fans up and down as needed.

I think the unit was like $10 at walmart. It is very similar to THIS.

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