You can make a lot of cool DIY electronics with an Arduino board, but you can actually make your own Arduino for a fraction of the cost—with a bit of room for customizability, too. Obviously ...

Look, [lord feistel] is doing glitching attacks on an ATMega328P! All you need is an Arduino board with its few SMD capacitors removed or a bare 328P chip, a FET, and some sort of MCU to drive it.