cadebytiger
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| posted on 22/12/08 at 09:51 AM |
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PC power supply - use out of pc
As above. I am trying to use a pc power supply to power a pc fan fume extraction system on the bench. The problem I have is that the motherboard
normally switches the power supply on. Does anyone know which of the big bunch of wires which normaly connect to the motherboard acts as a switch?? I
guess it is a relay type job??
Thanks for any help!!
Rupert
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liam.mccaffrey
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| posted on 22/12/08 at 09:55 AM |
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this didn't used to be the case, older supplies used to have a hulking great switch. Now they are all soft switched.
Which is why i used to keep a few old ones
Unfortunately I can't help you though good luck
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BenB
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| posted on 22/12/08 at 09:55 AM |
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"To power up a stand alone PSU for testing purposes, you need to short PS_ON pin with one of the common pins. Normally, PS_ON is activated when
you press and release the computer power button while it is in standby mode."
If you believe
http://www.smpspowersupply.com/connectors-pinouts.html
anyway 
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g.gilo
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| posted on 22/12/08 at 10:00 AM |
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p/s
green to common? i seem to remember
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JimSpencer
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| posted on 22/12/08 at 10:06 AM |
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Hi
Have a look at this:-
http://www.rcracechat.com/vb/showthread.php?t=2129
It tells you how to turn an old ATX PSU into a basic 12v bench unit.
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iank
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| posted on 22/12/08 at 10:28 AM |
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One thing to be careful of is many PC power supplies don't like being run without a load on them even for a short time. In the rcracechat
article the bulbs do that job.
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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f1ngers
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| posted on 22/12/08 at 10:34 AM |
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Take a look at Powering on an ATX PSU without a motherboard
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cadebytiger
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| posted on 22/12/08 at 10:36 AM |
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Brilliant!! Thanks... Will have a read!
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Benzine
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| posted on 22/12/08 at 10:46 AM |
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My water pump came with an adapter to fit onto the big connector that goes to the mobo so you can test the pump system out without powering on the
computer (check for leaks etc) Does the same as the link f1ngers posted 
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dhutch
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| posted on 22/12/08 at 11:30 AM |
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Yeah, green the ground.
Only further thing, that wont affect you, if that they dont like being too unevenly loaded. So often to get a decent whack out of the 12v line they
need a 100watt resistor across the 5v line.
Daniel
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coozer
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| posted on 22/12/08 at 04:07 PM |
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This is mine, turns the power on...
1972 V8 Jago
1980 Z750
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cadebytiger
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| posted on 22/12/08 at 07:19 PM |
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quote:
Originally posted by JimSpencer
Hi
Have a look at this:-
http://www.rcracechat.com/vb/showthread.php?t=2129
It tells you how to turn an old ATX PSU into a basic 12v bench unit.
In this post it says to connect the 12v to the 25W bulb and the 5v to the 5W...
Should this be the other way around?
Also... is it essential to have load on the 12v, 5v and 3.3v outputs or just the 12 in order to extend its life?
Thanks for all the help
Rupert
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