USE EXTREME CAUTION WHEN OPENING, HANDLING OR MODIFYING A POWER SUPPLY. THERE
ARE CIRCUITS/PARTS INSIDE THAT HOLD AN ELECTRICAL CHARGE EVEN WHEN POWERED DOWN
THAT IF TOUCHED OR HANDLED INCORRECTLY CAN CAUSE SERIOUS INJURY OR DEATH. WORSE
YET, IT COMPLETELY VOIDS YOUR WARRANTY. YOU HAVE BEEN WARNED, ATTEMPT THIS GUIDE
ENTIRELY AT YOUR OWN RISK.
Building A Test Power Supply
Ok, I know I know. This project is
probably seen all over the Internet and many of you may have already done this.
But for those of you who have not, Built Ford Tough will show you how to make an
ATX switched PSU test unit.
Have you ever bought a new lighting kit or
other electric mod product and wondered if it even worked before you went
through modding it into your case? This little project could save you time and
take the guess work out of that question. Having a test PSU will allow you test
various modding goodies. Sometimes modders get an idea for a mod and what we
want is not available as a modding product. So we need to know if our computerís
PSU will power the device or not. The test PSU can be used to test your device
by simply wiring a male molex to it. Because we will be showing a switched PSU,
you will have a completely independent and portable 5v and 12v power source. You
can take it one step further and make a 7v source as well.
What you will need
You will need a spare ATX switched PSU.
Specs will not matter because you are not powering a whole system. 150watts and
up will be plenty. You will also need a screwdriver, wire strippers, wire
cutters, and short length of heat shrink tubing.
What you do
Remove the 4 screws that hold the PSU housing
down and remove the housing. Set it aside for re-assembly later.
Next, remove the entire wire bundle from where
they exit the housing and take apart the rubber grommet and set it aside.
Now separate the molex power wires from the ATX
connector bundle and push them off to one side out of the way.
Next, you need to find two wires out of the ATX
bundle. These are the wires that normally receive the signal from the
motherboard to power up. You need to find the only green wire in the bundle and
the black wire directly on itís left.
Now use your wire cutters and snip them from
the ATX connector.
Next place the green and black wire you just
snipped out of the way so they do not get snipped by accident in the next step
Now, using your wire cutters again, snip the
entire ATX wire bundle out of the PSU. Take care that you donít snip the molex
wires, fan wires, switch wires, fuse wires, A/C jack wires, or the green and
black wire you cut in the previous step. You should snip the wires as close to
the PCB board as you can.
Now snip the green and black wire back to about
Strip both wires back Ĺ" and slide the
heat shrink over one of the wires. Twist the two wires together. You may solder
them at this point if you choose.
Now slide the heat shrink over the twisted
together wires and apply heat to it. A hair dryer works or if you are really
daring a lighter will work as well. It should shrink up nice and snug to your
connection and shield it from arcing. Once this is done push the wires inside
the PSU so that when you replace the cover they wonít bind up or pinch.
Next reinstall the grommet with the molex wires
through it and put the housing back together.
Finally, here you have it. A fully functional,
independent, and portable test PSU. Because we used a switched PSU in this
project you will be able to use the PSUís switch to turn it on and off.
- Guide written by