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Old 8th February 2007, 04:20 AM   #1
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Default ATX power supply needs a load to run???????

OK So I know about the connect the ground wire to the green wire to make a ATX power supply work when not connected to a Mobo. But MY next question is do I need a load to make it automatically stay on and " act like a AT power supply"?????? I have googled some and it seems I need to put a 10ohm/10v resistor or 2, 5v 5ohm resisters in series across a set of red and black wires. IM ok with all that But just was curious when I just jumper the green and black wires and plug in a sacrificial computer fan into the red and black wires I get a momentary attempt at the fan trying to run. Was this due to the fact that a single pc fan isnt a big enough load? and thus no continuous power? Thanks again.
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Old 8th February 2007, 04:53 AM   #2
KISS is offline KISS  United States
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http://www.smpstech.com/mtblog/minim...pply_load.html
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Old 8th February 2007, 11:44 AM   #3
poynton is offline poynton  United Kingdom
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Default Re: ATX power supply needs a load to run???????

Quote:
Originally posted by Video Freak
OK So I know about the connect the ground wire to the green wire to make a ATX power supply work when not connected to a Mobo. But MY next question is do I need a load to make it automatically stay on and " act like a AT power supply"?????? I have googled some and it seems I need to put a 10ohm/10v resistor or 2, 5v 5ohm resisters in series across a set of red and black wires. IM ok with all that But just was curious when I just jumper the green and black wires and plug in a sacrificial computer fan into the red and black wires I get a momentary attempt at the fan trying to run. Was this due to the fact that a single pc fan isnt a big enough load? and thus no continuous power? Thanks again.

Hi.

Yes, you do need a load.

About 0.5A, usually on the +12v line, will keep it going. ( yellow / black ) [I used an old 3.5" hard drive for testing PSUs]

The connection between the 'Power on' and ground is only momentary.

Using an old AT supply is much easier and, with 12 years as owner of a computer business, they are more reliable!!

Andy
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