Sometimes , there is no power supply and need only thing with the hand is old psu atx . With this small box are now practical to use somewhere else all atx 1.0 compatible power source . With this limitation is only version with just a + 12V power supply wire, no longer carry it. this version has space for 2 LED to indicate the operation of atx source . You will need: Adequate power switch to 13x20 hole ( can be 12x20 ) 2 5 mm LED ( red and green) and appropriate resistor ( 1K to 5V ) *4 banana connectors for mounting holes five millimeters superglue for fixing in atx body source. -- ATX supply wires can be soldered directly in banana connectors , necessary to cut the connectors from the source. -- In some cases , the holes for the LEDs must be increased with a drill . do not need much , just enough to hold the LED in place.