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Hacking Power Supply

billabott

I am taking the plunge and building a Work Bench Power Supply from a PC Desktop power supply.

The guy in the video suggest that a approximate 0.5 amp load be put on the 5 volt rail (12 volt rail on newer) of the switching PS in order to stabilize it.

 

This diagram shows how he suggests putting it together.

 

What say you?

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  • image

     

    The one I have is HP part  number  5187-1098.  The OEM label says HIPRO HP-D2537F3R, 250 watts max. and there is a new part that replaces it designated HP part  number 5188-2622.  Mine has no burn smell and I only gave $1.10 for it.  image  Hope it is fully functional.

     

    I am thinking 22 ohm 10 watt (Newark Part Number 40M8806 @$0.55 each has NO Stock, I could go with 40M8183) might be the right fit.  Justification: (12 volts / 22 ohms) * 12 volts = 6.55 watts

  • in reply to billabott

    Of the dozens of PC ATX-type power supplies I've used in analog, digital, and electrochemical circuits, I've never needed to add a "stabilizing" resistor.

     

    Basically, ground out the green wire, and the fan comes on.  You get +12V on the yellow, +5V on the red, and GND on the black wires.  The whole setup requires one paper clip and about fifteen seconds with pliers.

     

    The thing I really love about PC power supplies is if you overload or short them, the crowbar circuit just kills the power with a quiet "zoop" sound.  It self-resets after about a minute, giving you time to reflect on electrical safety!

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  • in reply to billabott

    Of the dozens of PC ATX-type power supplies I've used in analog, digital, and electrochemical circuits, I've never needed to add a "stabilizing" resistor.

     

    Basically, ground out the green wire, and the fan comes on.  You get +12V on the yellow, +5V on the red, and GND on the black wires.  The whole setup requires one paper clip and about fifteen seconds with pliers.

     

    The thing I really love about PC power supplies is if you overload or short them, the crowbar circuit just kills the power with a quiet "zoop" sound.  It self-resets after about a minute, giving you time to reflect on electrical safety!

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