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I have a few 12 V motors and other sensors/electronics that require anywhere from 3-12 Volts. I usually use a battery pack but did not want to continue to go through batteries. For prototyping, I decided to convert an old ATX power supply into table top power supply. This generally will allow you to have terminals for +12V, +5V, +3.3V and potentially a -5V and -12V. These voltages are pretty common for anyone who works with micro-controllers and sensors.

This project uses:
-Project Box
-x2 mounted LEDs
-ATX Power supply
-Various heat shrink sizes
-Toggle Switch
-x2 5 watt resistors
-x2 330 ohm resistors

Step 1: Preparing an old ATX power supply

There are a bunch of references for building them. First thing I did was find a supply laying around I could use. You can reference the diagram below for the color coding of the ATX supplies.

ATX supplies can put out a good amount of current. If the maximum amount of current were to be pulled I recommend using all the wires at  a given voltage to withstand max current draw. It may be 12 ground wires and 4 +3.3V wires etc...

**WARNING!!!! BEFORE CUTTING WIRES, USE A MULTIMETER TO CHECK THE CAPACITORS TO ENSURE THEY ARE NOT STORING ANY ENERGY. IT WOULD ALSO BE  A RECOMMENDATION TO LET THE SUPPLY SIT FOR SEVERAL DAYS FOR ANY CHARGE TO DISSIPATE"

Remove the cover and cut the adapters off of the wires coming from the supply. You should be left with a large amount of wires that will need to be stripped. 
Nice blog! :-) <br>about power supply I always would warn about using a lethal power of 400 watt or more for hobby purpose...
Lethal power??.. WE are talking about maximum of 12 VDC here... Not lethal... The wattage has nothing to do with it being lethal... It is voltage at amps that kills..
<p>Do Not be FOOLED! 1 Volt at 1 Amp has the potential to KILL YOU! I agree it is usually higher voltages that are Dangerous, but this supply must be respected just as any Potential Shock Hazzard Needs to Be! The more one get shocked the lower voltage it takes to feel it. I have been doing electronics for over 50 years and have been shcoked many times, even have a few scars from one or two incidents. I am to the point now that I can feel a shock of the electricity flowing on occation from touching across a 12 car battery connection. </p>
<p>1v 1A definitely CAN NOT kill you. 1v 1,000 A, maybe. It's current that kills, not voltage. You feel the thump of a 12v battery because it has between 400 and 1,000 amps. There's absolutely no danger in an ATX power supply's 12/5/3.3v output.</p>
<p>Do Not be FOOLED! 1 Volt at 1 Amp has the potential to KILL YOU! I agree it is usually higher voltages that are Dangerous, but this supply must be respected just as any Potential Shock Hazzard Needs to Be! The more one get shocked the lower voltage it takes to feel it. I have been doing electronics for over 50 years and have been shcoked many times, even have a few scars from one or two incidents. I am to the point now that I can feel a shock of the electricity flowing on occation from touching across a 12 car battery connection. </p>
<p>Do Not be FOOLED! 1 Volt at 1 Amp has the potential to KILL YOU! I agree it is usually higher voltages that are Dangerous, but this supply must be respected just as any Potential Shock Hazzard Needs to Be! The more one get shocked the lower voltage it takes to feel it. I have been doing electronics for over 50 years and have been shcoked many times, even have a few scars from one or two incidents. I am to the point now that I can feel a shock of the electricity flowing on occation from touching across a 12 car battery connection. </p>
<p>Do Not be FOOLED! 1 Volt at 1 Amp has the potential to KILL YOU! I agree it is usually higher voltages that are Dangerous, but this supply must be respected just as any Potential Shock Hazzard Needs to Be! The more one get shocked the lower voltage it takes to feel it. I have been doing electronics for over 50 years and have been shcoked many times, even have a few scars from one or two incidents. I am to the point now that I can feel a shock of the electricity flowing on occation from touching across a 12 car battery connection. </p>
<p>what is the -12 rail used for and do i need it to make the power supply?</p>
Great Job!!... I am glad this was presented again... I have made dozens of these over the last ten years... There are still some people on earth that will not believe it is possible for this to work... These make a very powerful and trouble free power supply..
Do you have entered any pictures of your actual wiring?
Good idea well executed.
I dont know if you are aware of it, but in the first pic, the large comment box has obscured all the smaller inner ones, so all you can see is the &quot;project box radioshack&quot; comment. Perhaps you can edit it to be long and thin highlighting the top of the box so that it doesnt obscure the others. <br> <br>Overall, nice one, good pics and covered all the details.
Yes!!! Thank you for pointing out

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