need Computer power supply trick

[Al Skierkiewicz]

Tytus,
Several websites suggest the connections outlined above. Please be careful, the five volt supply is a high current device. Short the wrong wire to ground and the jumper may get very hot. These power supplies have internal fuses but generally only on the mains input. Also, without a load on the five volt power supply, the 12 volt power may not regulate very well. It depends on the supply design. Don't open the supply if you are not familiar with switching power supply design. A large portion of the power supply and circuit board is at line potential, 120 VAC.

[Don Reid]

You should also be aware that many PC power supplies require some minimum load to turn on and to maintain regulation.

[CJO]

I have a similar problem, except, I have a board with only six pins in the molex connector, they are labeled +12v, -12v, gnd, gnd, +5v, +5v (yes, two +5v). I have tried an ATX and an AT power supply to no avail, bench supplies will get a warning beep (wrong power), I think that the bench supplies are to low an amperage. Any thoughts?

[team1307]

this doesnt work on power supplies that come with computers like dells, HPs, Compaqs, ETC.. This will work if you use a power supply that you can pick up at a local store.