Hi- The people in the model railroading fraternity would like to put RFID transponders onto their trains. However the readers are too expensive. Does anyone know how to build a cheap transmitter/receiver to read them? I expect they could be quite crude=cheap as the distances involved would ideally be <3 inches. David H -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads