Easy ATX Bench Top Power Supply.

Step 2 Walkthrough:

First off, unplug the supply. Then hack off all the wires, leaving a few inches hanging out of the power supply. If it has been plugged in within the last day or two, be sure to bleed the capacitors off. There are many tricky ways to do this.. but you can easily do this without even opening up the supply. Cut the green wire. Turn on the power switch, if there is one. Then touch the green wire to the chassis and wait till the fan stops moving.

Open the chassis. If you want to remove some of the extraneous wires, you can either cut them off or desolder them. I desoldered mine. If you choose to desolder them, you'll need to remove the pcb. Remove the screws and lift the pcb, carefully. Then touch a conductor between the contacts of the big high voltage caps, just to be sure they're completely bled. Be sure to use only one hand while doing this, so you aren't forming a circuit that goes near your heart.

I left only a single wire for each output, and two for ground. You can then solder up the voltage sensing lines and/or the green line, right now, as outlined in the previous step. Or if you aren't sure exactly how to connect these yet, don't worry about it. You can just port over all the lines onto the outside of the power supply and figure it out, later.