This is a portable power station that I designed for personal electronics repair purposes. It includes the following features:

1.2V to 25.4V DC power output with a maximum current of 4A A removable tray on top to store small items or tools Uses standard 0-1 on/off switch and 4mm DC jacks.

It is a voltage regulator that both increases and decreases the voltage, which contains the LM2577S and LM2596 voltage regulator ICs. I used this board. I used a normal 12V adapter to power the board.