I need a circuit diagram consisting of a transmitter and receiver circuit separetly.The electronic parts should be easily available. The unit should work on the principle of radio waves (radio frequency) and not on infrared principle.The radio frequency coverage area should be of a minimum of five meter's. Purpose of the circuit Diagram: As I press my remote control (transmitter section), switch, the relay in the receiver section must then be activated. I wish to pay the person for the circuit diagram,which can be sent by email, in the form of attachment.But the parts should be easily available in India. I am not interested in a module of receiver or in the module, as a transmitter unit . I want to assemble the entire receiver section seperately and the transmitter section too, with easily available electronic parts. I only need the circuit diagram of the radio frequency based remote control switch. Can any one suggest a similar website selling similar circuit diagram?