Ultimate DIY Breadboard Power Supply

For prototyping, nothing beats a breadboard! But how to provide power to the little black and red rails that fuel our designs? There are a couple of conventional options:A bench/lab variable power supply. A must-have to be sure, but expensive, big and (arguably) overkill for low power circuit design and general hobbyists.Jumping power from an Arduino. Useful for testing, but it adds to the jumper clutter. Also, it can be useful to save those 5V / 3.3V rails for powering something else, rather than just feeding a breadboard.Batteries. Nothing kills maker-mojo faster than battery anxiety! So I decided to design something that could do one job - power any breadboard - and do it really well, with enough options to make it indispensable for small prototyping projects.”

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