Computer powers supplies are readily available and make a good 12 volt or 5 volt power supply. The only thing is when they are not connected to a computer you need a way to turn them on. It's really very simple. This is an ATX Power Supply for a typical modern computer.

Step 1: Jumping Pins

Looking down on the main ATX connector with the locking tab facing up. Jump the green and black wire, they are the pins 3 and 4 counting from the right.

I spliced and soldered in a switch to make it convenient to turn on and off.

Step 2: Video of the Process

Here is a video of the process for those who like to view it.

<p>I will soon have the need to use a PC power supply. Could you state what type of supply you're using? Is it ATX?</p><p>I read somewhere that for ATX you need a dummy resistor (or a 12V lamp) to draw some minimum current to keep it up and running.</p>
<p>2 things :</p><p>1.Shouldn't your switch be a &quot;pushbutton&quot; switch (the one with the spring, that make it come back in place) and not a &quot;constant contact&quot; one (sorry i'm hard to understand, i don't know the english term for these 2)</p><p>2. When you use a power supply, check your need and the power used ... not need to use a 650W power supply only to use the 5V ...</p>
<p>A momentary switch (push button) will not keep the power supply on, in a computer motherboard there is circuitry that keep the power supply on. The &quot;jumper&quot; between the two wires must be constant for the power supply to remain on. So it is necessary to have a switch on the whole time.</p>

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Bio: http://www.youtube.com/c/AndrewWorkshop
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