Hi Vasile. Vasile Surducan wrote: > > Many. Switching the LED will be like vodka with water... :) > If you was thinking to a constant current switcher, than keep the > sensing resistor in the transistor's emitter and the IR led in the > transistor's collector. Else will be a mixed analogic/switching > design. More details please. What sort of analogic / switching design ? WBR Dmitry. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist