As someone who likes to take apart electronic things, I frequently pull stuff like LED's, motors, knobs, and switches out of old junk with plans to reuse them later. This instructable is not only an example of that reuse, but also the creation of a tool that allows me to test these parts quickly and easily.
By using a buck converter, I have a power supply that displays the voltage and can be adjusted, instead of always having to test parts using batteries and swapping out different battery combinations to achieve different voltages. Now that I have this power supply, I just clip the leads on and turn the knob! The Etch A Sketch is just fancy packaging.
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