easy fm bug transmitter circuit

500m FM transmitter circuit


Easy , Simple and best FM transmitter circuit for homemade mini radio station

easy fm bug transmitter circuit


Transistor- 2N3904-2

Resistor-1M-1, 470Ω-1, 47kΩ-2, 10kΩ-1

Capacitor-1nf-1, 0.1uf-3, 10pf-2, 33pf-2

Inductor- 4-5 Turn of 4 mm dia air core coil of copper wire

Condenser mic-1

This simple and easy FM transmitter circuit can transmits the input signal get from the microphone upto 500 meter range area. Two npn transistor and some discrete components are used in the circuit.

You can use 3v to 12v DC power supply for this circuit. At low voltage , range of this transmitter will shorter. At high voltage range will also increased. 

In this FM transmitter there is no any variable capacitor are used for tunning by the change of capacitance, So the frequency will remain constant, if input power supply is no fluctuate. This is simple circuit and can easily construct at any general purpose vero board or pcb board. For more stability of frequency dont use ac adaptor, use only battery and all connection should insulated from external touch. 

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Hi, My name is Aman bharti, I am interested in making and study of Electronics & circuit diagram. I like to share my knowledge and all ideas with people which i get from My Experiment & from different sources. I try to provide any circuit details deeply with test result as possible as. You can contact me on- Email – [email protected]

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