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Convert an ATX power supply into a regular DC power supply

I did this project https://www.instructables.com/id/Convert-an-ATX-Power-Supply-Into-a-Regular-DC-Powe/ just today, but all the results came out negative voltage (e.g. -11,45 on the 12v) on the multimeter. Did I do something wrong or is it supposed to be like that?

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Padlock8 years ago
Do you have your multimeter leads crossed? (Assuming that your using a multimeter...)
kithso (author)  Padlock8 years ago
Leads are fine and labeled anyway. All in all Im calling this one a success. It powers my 12v styrofoam cutter (homemade of course) just fine. Also tested it on some 12v pc fans and some other odds and ends.
Padlock kithso8 years ago
How do you power the Styrofoam cutter? ATX Power supplies cut out when they are short-circuited, and since the path has such low resistance I imagine it would cut out.
kithso (author) 8 years ago
Sorry for the back to back posts but heres the device in question.
100_0399.JPG100_0401.JPG
depending on your power supply, 12 volts may not be yellow. I think on mine yellow = 3.3 volts
kithso (author)  guyfrom7up8 years ago
Yellow is coming up -11.45 on the meter
then that may be -12 volts from your powersupply
kithso (author)  guyfrom7up8 years ago
All of the posts I made are coming up negative.
*guyfrom7up* Any luck?
*kithso* negative, sir.

:-P
kithso (author)  kithso8 years ago
Decided to just go ahead and test it on some LED's. Worked ok but i accidentally crossed the wires and now I got nothin. Alas
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