DIY PC PSU Bench Power supply voltages

DIY PC PSU to Bench / Project Power Supply

Computer power supplies cost around US$30, but lab power supplies can run you $100 or more! By converting the cheap (free) ATX power supplies that can be found in any discarded computer, you can get a phenomenal lab power supply with huge current outputs, short-circuit protection, and reasonably tight voltage regulation on the +5V line.

[su_spoiler title=”Requirements” style=”fancy”]
– An old working PC Power Supply, Look online, at your local computer store or dismantle an old computer and remove its Power Supply from its case.

I found an old 420 Watt Power Supply:

oldpsu

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The maximum output(A) per voltage should be written on your Power Supply :

PSUpowerratings

[su_spoiler title=”Test your Power Supply” style=”fancy”]

If you are not sure if the Power Supply is still working you can test it by shorting the green wire to any black wire, this method works for the 20-pin and 24-pin ATX Connector :

PSUhotwire

Then plug-in some PC accessory or fan to test if it turns on

PSUhotwiretest

If the fan spins, your Power Supply is still OK!

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[su_spoiler title=”Color code Voltages” style=”fancy”]

PSUvoltagecolors

[su_table]

Red +5V
Yellow +12V
Orange +3.3V
Blue -12V
Black GND

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[su_spoiler title=”Always on Power Supply” style=”fancy”]

First, you want your Power Supply to be on all the time… this can be done by connecting/soldering the green wire to a black wire :

PSUhotwirefixed

For extra protection, you could wrap it in tape or shrink wire.

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[su_spoiler title=”Create your Bench Power Supply” style=”fancy”]

First, open your Power Supply and cut all the zip-ties and connectors :

PSUnoconnectors

Now tie all the corresponding colors together

PSUvoltagecolors

Lead the wires back out of the enclosure and close your Power Supply

PSUassembly

Screw your Power Supply back together and you now have a cheap very powerful Bench / Project Power Supply

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[su_spoiler title=”Extra – Powering an Arduino” style=”fancy”]

To power an Arduino, I recommend using a plug (DealExtreme)

arduinoconnectorpsu

connect a black(GND) wire to the (-) and connect a red(+5V) wire to the (+):

PSUArduinoplug

Connect your Arduino:

PSUarduino

You now have a project Power Supply.

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