Adjustable constant-current source I designed for things like laser diodes. Full details at: http://imajeenyus.com/electronics/201...

More details on the grounded-wiper potentiometer feedback network: http://imajeenyus.com/electronics/201...

This was used to power a 300mW 808nm laser diode on the AxiDraw drawing machine for some rudimentary laser cutting: http://imajeenyus.com/computer/201605...