I built this little constant current sink - It goes from 0A to about 3A with input voltages of up to 30V. The current is ajustable in steps of about 1 mA by using a big 10-turn potentiometer.
by Attitude Lolita
by Sasha MACRAMESSAGE
by hombre210772
by DIY with Ollie
by Miniatures For Dolls
by beading tutorials
by Crafty Ladybug