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DC Lab Bench Power Supply
The Ingredients...
The Process...
I was going to take my time with this build, using a large transformer I recovered with many taps on the secondary and really try to make something with great capabilities, but came across a 450w ATX PSU at the local thrift shop for $3 and figured "why not". It's not as if I don't have any use for these voltages. My camera was also a thrift shop buy and had no charger (needs a 5v), I've got other items like peltier cooling elements, MANY cooling fans, and on and on. So a smaller power supply that I can put places that a big transformer one wouldn't fit sounds like something that I wouldn't regret having, and should be pretty quick to build. As I said, I started with a 450w ATX PSU. I took it apart and cleaned it heavily with high pressure soapy water via my air compressor, then blew all of the soapy water out with the air gun, reassembled and left overnight in case I missed any water shorting a connection. Then I connected the green wire to a ground wire, a few resistors in series as a load on the 12v rail, and fired it up to test it. It worked just fine. I took a block of 8 terminal jacks (4 in various colors to tell apart the different voltages quickly/easily, and 4 black ones for their corresponding grounds) from my collection of recovered components and connected it to the output on the ATX supply, using heat shrink tubing to reinforce/isolate them, and then went over all connections and exposed metal with liquid electrical tape to prevent any accidental short from occurring.