$10 DIY Variable DC Bench Power Supply

I was able to build mine for $10.46 because I had lots of used parts laying around from various projects. However, the parts list below shows everything needed. All I needed was the display, dc-dc converter board, and the potentiometers. The switch controls the main 12v power from the power adapter, which powers the dc-dc converter board and fan when switched on. The dc-dc converter board uses small potentiometers, so I desoldered them and replaced them with large ones that could be mounted off the board. The left potentiometer is voltage control and right is amp control, as seen [here](http://kimgrity.com/images/IMG_1935_04.jpg). The display is wired like [this](https://i.ebayimg.com/images/g/DLwAAOSw0kNXg1KO/s-l500.jpg), except that I powered the display on the input side of the dc-dc converter board. And that's it! Enjoy!

Here the parts:
* [DC-DC Step Up Down Board | $3.17](https://www.ebay.com/itm/DC-DC-Step-Up-Down-Boost-buck-Voltage-Converter-Module-LM2577S-LM2596S-Power-N2/