FM Transmitter:
Components Required:
- 9V Battery
- Resistors: 15k and 1K each.
- Capacitors: 0.001 uF, 4.7 pF and 10-40 pF each.
- Inductor Coil
- Electret Mic for Input Audio
- Transistor: 2N3904
- Antenna 15"
Working:
FM transimission is done by the principle of audio pre amplification, modulation and then transmission. Here, we amplify the audio input signal taken from the Electret Microphone with the help of the transistor Q1, modulate it according to its frequency with the help of the inductor coil and finally we transmit it through the antenna connected to the inductor coil. This is just a simple model of FM transmitter and it works just up to a certain range (about 100-200 meters).
Note: We should keep in mind that modulating transmission of a certain standard frequency is a breach of the law and it should not be practiced in real life. So, just build it as a learning project in a very small scale.
Note: We should keep in mind that modulating transmission of a certain standard frequency is a breach of the law and it should not be practiced in real life. So, just build it as a learning project in a very small scale.
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