ATX power supply panel

thingiverse

# ATX power supply panel A simple top mounted panel for re-using a discarded ATX computer power supply unit as lab bench power supply. I used the outside wires from the long ATX connector which go to the banana terminals and did not need to open the case. I also left two 4-pin "P4 connectors" in case I want to connect any PC hardware (fans, drives etc) later. The panel is 150mm wide which seems to be a standard size, but yours might be different. The same applies to the srew holes which hold the panel on top of the power supply. Regarding the wiring, refer to the many available tutorials online (instructables etc). This is just a short summary : Common ATX connectors have 20 or 24 pins. The color coding is standardized (see chart). After the power supply is switched off and completely discharged, cut the wires from the connector, group them and solder to the terminals as shown below : Yellow: +12V Red: + 5V Orange: +3.3V Black: 0V (GND) White: -5V Blue: -12V The green wire is used to turn on the power supply. Connect this to an ON switch (switch connect the green line to ground, one of the black wired). The purple wire provides a +5v standby signal when the power supply is connected to the wall socket. I used this line to indicate "AC on" with a red LED and a 330 Ohm resistor. The gray wire signals "Power Good / On" by providing +5V when switched on. I used a green LED and a 330 Ohm resistor to indicate the output terminals are enabled. Notes : - Disclaimer: Electricity can be dangerous! There are large capacitors in ATX power supplies that will store a dangerous charge for a long time. Let your power supply discharge before altering any connections or opening. IF YOU ARE NOT SURE OF WHAT YOU ARE DOING - DO NOT ATTEMPT THIS. - Some ATX power supplies require a small load to stay in the ON mode. Add a 10 ohm, 10 watt resistor between +5V and ground to provide a small load if needed. In my case, the fan consumed enough power alreday. But that depends on your model. - It's safer to put fuses on all signal lines which I didn't bothered to do, but still highly recommended. - the minus 5V line (white) is not always present (omitted on newer models)