This is a circuit of a simple fm telephone transmitter which will transmit the telephone conversation to any fm receiver to a small distance. Q1 is 2SA933 Transistor, diode D1 to D4 are 1SS119 silicon diode and L1 is equal to 8 turns of 23 guage enameled wire wound on 3.6mm diameter form.
The range of the circuit is up to 180 feets. This phone tranmitter circuit is easy to build and require only few components.
Note: This circuit is for educational purpose only.