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Remove PSU rails? Answered

This may sound like a stupid question but uh...
How does the different rails of a computer power supply work? Could the other rails of a computer power supply be removed? So, suppose you have a computer power supply with 12v, 5v, 3.3v, and -12v, but you only want 12v without having the other voltage circuits operating. Is there a way to remove or disable the other circuits so you only get 12v without having other rails wasting energy not doing anything?

Discussions

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Vyger

3 years ago

Wire cutters are very effective for removing the voltage wires you don't want. However turn the power off first.

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iceng

3 years ago

No aspersions on the nice Chinese people.

But was it they, the Chinese enginors, that built the original switching PS that

Don't work with out a minimum parasitic load component ?

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Wired_Mist

3 years ago

Just Leave them unconnected. They will just sit in Idle :)

As long as you have current draw on the 12V and (5V or 3.3V) rails the rest can just be left unconnected. I would strongly suggest you wrap the loose wires with electrical tape or heat shrink to prevent shortages!

Switching power supplies like this need a small draw to operate withing Specs. You only need 500ma draw on the 12v and 5V/3.3V rails. I usually just use a 12V lightbulb for a power indicator and a few fans on the 5V. *Check out the "Related" tab on the side of your screen for more info !

And the PSU will only provide enough current to supply what you have hooked up to it. The other Rails won't use extra current just because one is using more then the rest.