Report Help needed building a radio transmitter/receiver system in Electronic Projects Design/Ideas Posted January 14, 2004 DTMF, huh? Good and cheap solution, but too "classic analog" don't you think? I prefer digital; it's more secure...Anyway, I think it's perfect for our friend with the level of knowledge he has. Tips for james120479: - You can ommit the flip-flops (4013) if you don't want to hold the last state (which transmitter was last used). - Forget the 418 MHz receivers we discussed earlier. You must use a simple FM radio receiver instead.