He suddenly realized that electrical junction boxes were cheap, widely available, and perfectly suited for the job. He hauled off to the hardware store and bought a few different boxes ...

With this list focusing on cheap toolboxes, everything will be under the $100 mark, and many of the boxes will come in far lower. You can find a more in-depth explanation of why these picks were ...

The device is powered by an 18V transformer and rectifier and, as a bonus, [Stynus] got all of his parts on the cheap which made this a great solution to the expensive resistance decade box problem.