I built the transmition circuit (940 nm) that works with 1.5Khz (with 555 timer chip) . now i having hard time to build the reciever for long ranges (10 meters and up). can someone please give me directions or diagram how to built this circuit?
which led and photodiode do you reccomend for this range? does the frerquency that i have used in the transmiter (1.5Khz) is good for this range?