Power Adaptor

I use an old computer power supply to make a lab power adaptor. This power adaptor have fixed and variable voltage. A 5 Volt fix voltage and optional 3.3, 12 and -5 volt with high current outputs and short circuit protection.

Part list:

• Crocodile clips
• Binding posts (terminals)
• Galvanised plate
• Conectors
• Wire connector
• LED
• 1K resistor
• Switch
• Spongebob assistant (optional)

make your favorite panel, I use galvanised plate and yellow paper. Design and draw panel with computer software and print on paper and paste on galvanised plate. Then drill holes for terminal, LED and switch.

• Screw the binding posts into their corresponding holes
• Attach the nut on the back as shown on pictures

Mount switch and LED on the panel.

Use 1K ohm resistor and solder to LED and notice the polarities.

Connect and solder black and green wire to the switch

• Open up the power supply unit
• Seperate red, orange, green, white, yellow and 3 black wire
• Cut other wires
• Make sure wire not connected together

Wire Colors:

• Red: 5V
• Yellow: 12V
• Orange: 3.3V
• White: -5V
• Green: Power on
• Black: GND

The color of wires may be different, see this link or use a voltmeter.

http://www.smps.us/power-connectors.html

Solder orange, yellow, black and white wire and connect to binding posts as shown

• Use Crocodile clips for fixed 5v
• Connect crocodile wires to red and black
• Use wire tape

Use hot glue to fix LED, switch and wire

This link is a great Encyclopedia of ATX to Bench Power Supply Conversion, thanks to russ_hensel

https://www.instructables.com/id/Encyclopedia-of-ATX-to-Bench-Power-Supply-Conversi/