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FM transmitter using crystal

FM transmitter using crystal 


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Power supply :- Using power supply stable DC voltage 2 V to 3.7 V max. You can only use battery because battery is perfect for this circuit battery output doesn't any noise.
Components :- Transistor BC 547, Resistance 100 ohm, 4.7K ohm. Capacitor 1nF, 47pF,              22pF. Inductor 1uH. Condenser mic any. 
    Resistance :- Using resistance 100 ohm +-5% changing 1/3 watt, 4.7 K ohm +-5% changing 1/3 watt.
Video link - https://youtu.be/aV7K2NHrHTM

3 Volt Circuit Diagram

Capacitor :- 1uF this capacitor positive pin connect 4.7K ohm resistance one pin and another pin connect 2K ohm resistance one number pin.


5 Volt Circuit Diagram

This Circuit Transmitter range 0.3 Kilometre (300 Metre) to 0.5 kilometre (500 Metre) without any obstacle otherwise range 0.2 Kilometre (200 metre) anywhere. It's a spy device.



Discuss about listing components Used transistor BC 547 for oscillator and I'm using crystal for noise clear frequency and it is very stable frequency.  I am using crystal 25 MHz(25000000 Hz).
you also use 27 MHz (27000000 Hz) , 16 MHz (16000000 Hz) , 20 MHz (2000000 Hz) Etc.


Using 1 K ohm resistance for safe collector transistor overheating. Using 4.7 K ohm resistance for active mic .


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