I have started to make a bench power supply from an old mini ATX power supply. The supply is really small and does not have room in the case to mount the binding posts for the outlets or the fuse holders for the voltage rails. I am going to mount the supply in to an ABS plastic case but still keep it in its own steel enclosure to restrict RF from the switch-mode.
Here is a pic of the first stage of the Hack, removing all the excess power wires, the supply is on the right with the excess wires removed on the left.
I will be able to have +12VDC at 20A , -12VDC at 500MA, 5VDC at 30A and 3.3VDC at 18A.
Inline fuses in all the rails will be fitted to protect the supply. I have wired the Soft switch of the supply permanently on as I will have a Hard switch in the Mains AC input so that I don't use any power while the supply is just sitting there. An ATX supply supplies 5VDC even when it is 'off'.
I will also be fitting a variable voltage regulator based on an LM317 in to the case from the 12VDC rail to give me variable voltage, this will also have a Voltage meter (analog panel meter).
Here is a pic showing the large ceramic 10watt resistor fitted in to the supply.
The supply on the test bench the meter on the right is reading the +12VDC rail and I was getting 12.06 volts and the one on the left is the +5VDC rail at is at 5.14 volts.
I will be hard wiring the supply with a mains lead and get rid of the C13/C14 connection normally used on a PC supply.