Very small variable dummy load, no protection so be aware of the load you put on it. Only 40 Watt to be on the safe side. If the MOSFET smokes the load was to high ;-) (yes I did smoke one, had no cooler on it :-( ). Primarily build it to test a bunch of unknown transformers I had lying around, and it seemed and is a fun project.
Dummy load circuit and PCB. I use this to test PC Power supply and batteries. This project is based on Gaston Circuit ( see youtube links on bottom ).
Resistencia de carga electronica ( con su correspondiente PCB ). Este circuito sirve para realizar pruebas de fuentes de alimentacion, pilas y batterias cuando se las exije ( yo la uso para pruebas de fuentes de PC y pilas 1...