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We purchased a regular computer power supply to provide the voltages and current to the various electronics of the project. A relatively inexpensive computer power supply comfortably and quietly supplies more than enough wattage.

ATX power supply pinoutsPinouts for the various connectors

Remember the note at the bottom of the above image. Without a motherboard connected, those wires will either need to be shorted together or on a switch to get the power supply energized.

All the wires on a power supply are consistently coded and easy to figure out.

Power supply wire color codingWorth a thousand words

Lots more cool stuff at



    • Mickey
    • Posted 05/05/2013 at 12:02 AM
    • Permalink

    VERY innovative Henry.

    I had experimented with mobile phone chargers to provide me with a ‘reasonable quality’ 12VAC output. It worked fine lighting up my LEDs, but I had always remained concerned that a small charger didn’t have enough wattage rating to drive so many electronics.

    For a few months now, I had been deliberating my decision to purchase this power supply (

    But, what you propose here, is a much cheaper and more versatile solution, except the outputs are all DC.

    Very interesting.

  1. For a different kind of project built several years ago, I had used a power “brick” similar to laptop charger. It worked “ok” but ran warm and only supplied one voltage. Adapting a real power supply seemed like the next logical step.

    If you need raw AC as I did on the other project, you can wire a power strip into the incoming power wires. Or even wire up an normal outlet box with receptacles.

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