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Fm transmitter circuit

Fm transmitter circuit


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, 4.7 K 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.

Capacitor :- 1nF this capacitor number 102 non-polar, 22pF this capacitor number 22 non-polar, 47pF this capacitor number 47 non-polar.

Inductor :- This part important part for any transmitter circuit, 1uH 5Turn 24SWG.

Transistor :- BC 547 is an NPN Bipolar junction transistor. It is commonly used to amplify current. A small current at its base controls a larger current at collector & emitter terminals. It has a transition frequency range up to 100 MHz. When using the transistor as a switch, the max current rating poses a limit on the type of loads that it can drive.

Working :- The FM transmitter is a circuit that uses a very low power to operate and does uses (Frequency Modulation) FM Waves to transmit the sound. With the help of such FM transmitters we can easily transmit the audio signals through the carrier waves with different frequencies. First condenser microphone enter voice signal than go to amplification or filter than go to transistor base and transistor switch to activate VCC come out to inductor than generate frequency inductor noise filter 22pF capacitor vcc go through transistor collector to emitter through 100 ohms resistance and transistor collector noise clear through 47pF.

FM frequency :- Frequency modulation is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. The term and technology is used in both.

See Next part using crystal 

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FM transmitter using crystal   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. D...
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