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Thread: Running an external PSU

  1. #1
    HEXUS.bouncer Jonny's Avatar
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    Running an external PSU

    You know how you can boot up a PSU by shorting the two pins on the motherboard header? well, just how safe is this?
    Could I just solder the two together with a short wire and safely run the PSU as an external extra, powering some fans, cathodes and a Muskateer?
    It would be on a good few hours a day.
    Thanks!

    Jonny

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    Treasure Hunter extraordinaire herulach's Avatar
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    yes

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    radix lecti dave87's Avatar
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    your better setting up a relay from your main power supply, the power supply's I have done it with all power down when there is no significant load on them - after about 20 seconds (it was tried with a couple of fans)

    Oh, and it is perfectly safe

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    HEXUS.bouncer Jonny's Avatar
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    Quote Originally Posted by dave87
    your better setting up a relay from your main power supply, the power supply's I have done it with all power down when there is no significant load on them - after about 20 seconds (it was tried with a couple of fans)

    Oh, and it is perfectly safe
    Hmmm. So how much load do they need on them before it will stay on?

    Thanks for the help.

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    Seething Cauldron of Hatred TheAnimus's Avatar
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    depeneds on the PSU, switchmode PSU design scares me, and makes me go back into my happy place that is only worrying about digital stuff.

    some don't require any real load (trail n error here!) the silent 80w ones i use for my ITXs will happily power on to run just 1 fan.

    often thou, you need something on the 12v and 5v rails. Easyest way, big resistors. By big i mean power raiting as they have to disapate a lot of heat.

    But if you don't need more than say 30w, why use a 400w PSU?
    http://www.rapidelectronics.co.uk/rk...1065&XPAGENO=1
    http://www.rapidelectronics.co.uk/rk...1063&XPAGENO=1
    silent
    throw new ArgumentException (String, String, Exception)

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