ADJUSTABLE BREADBOARD POWER supply

This looks like a terrific addition to your breadboard. [Nerdz] wanted a power supply that was easily portable and adjustable. He built a custom-made board that plugs directly into the breadboard’s power rails. It has a pot attached to the ground of a 7805 voltage regulator so the output can be adjusted from 5V to just under the supply voltage. Anything that makes a breadboard less of a rats nest is absolutely a good thing.