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easy fm bug transmitter circuit

500m FM transmitter circuit


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

 Homemade FM Transmitter circuit diagram

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 transmit the input signal gets from the microphone up to the 500-meter range area. Two NPN transistors and some discrete components are used in the circuit.

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

In this FM transmitter, there is no variable capacitor are used for tunning by the change of capacitance, So the frequency will remain constant if the input power supply is no fluctuate. This is a simple circuit and can easily construct at any general-purpose Vero board or PCB board. For more stability of frequency don’t use ac adaptor, use the only battery and all connections should be insulated from external touch. 

About the Author


Hi, My name is Aman Bharti, I am interested in making and study of Electronics, circuit diagram, PCB designing and layout etc. I like to share the 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 results as possible. If you want to give a suggestion or comments on anything, please leave your comment in the comment box of the related page.

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