Simple FM transmitter Circuit
This is a circuit diagram of the FM transmitter which constructed very easily. This FM Transmitter circuit needs very less components. This circuit is based on two NPN transistors of 2N2222 which is a low-power amplifier. At the first transistor stage, the input signal is preamplified and then the transistor T2 will Amplify the signal as a power amplifier and then amplified the signal to be modulated and transmitted through output as an antenna. Use 9 or 12 v DC regulated power supply, Regulated power supply needed because oscillation affects the frequency at the output as power variation occurs in supply.
This circuit construction is so easy and very portable to operate. The use of this transmitter is only for educational purposes.
Circuit diagram of small FM Transmitter
- Resistors ¼ watt (220Ω-1; 1kΩ -2; 2.2kΩ; 10kΩ-1; 15kΩ; 6.8kΩ; 4.7kΩ -2)
- Electrolytic capacitors 16V (2.2µF; 10µF x 2)
- Capacitors ceramic (0.1µF x 2; 4.7pF)
- Variable capacitor (50pF)
- Inductor (0.1µH)
- Transistors (2N2222 x 2)
- Condenser mic