Hello, just a quick question, i'm trying to build a driver for StoneTek IR diode, but i don't understand few things.
I'm using 4,3ohm resistor and 100ohm pot. If i want 250mA, the resistance setting for the pot should be (1,25/0,25)-4,3=0,7ohm ? That seems to be very hard to get on 100ohm range...