Thursday, November 13, 2008

Converting PC power supply unit for Workbench

This is a very simple project, for those interested in testing circuits and other misc uses.
Since the PC power supply outputs 3 voltages, 3.3, 5 and 12V, you will need 4 terminals, 1 for ground.

Make sure the AC in not plugged it.
Begin by trimming off all the connectors.

Yellow is 12V.
Red is 5V.
Orange is 3.3 V.
Black is Ground.

Green is usually for on and off the power supply. Refer to the side of your power supply. Sometimes it is the gray wire. Solder a Green and a black to wire to a switch.

Take 2 wire strand of each colors and trim off the the tip. Untangle em. Solder all, 2 strand of same color together. So now you have 2 yellow, 2 red, 2 orange and 2 black. You dont really need 2 strands but you never know when you need more amp. :) This will ensure your cables dont melt. Solder these to the terminals. Label the outputs on the casing.

Use an orange wire (3.3V) to power up your LED.
You can get a 1K resistor and connect solder it to a LED and a black wire for ground. This will indicate to you that the supply is on or off.

Close everything back and give it a shot. :)

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