This is a simple circuit for telephone transmitter. This circuit is ideal for transmitting the telephone conversation through small distances. The circuit using a few components to setup the circuit and its based on a transistor as core the circuit. This is a figure of the circuit.
In the entire of the circuit can be included in the telephone itself or in the junction box. The power supply of the circuit is from the telephone line. The operation of the circuit is the transistor is wired as a Colpitts oscillator to produce oscillations in the FM transmission band. The audio signal from the telephone line is coupled to the base of the transistor to obtain the frequency modulation. The LED D1 is act as a power on indicator. Any radio frequency PNP transistor like A933 can be used for built the transistor. For L1 make 8 turns of 0.6 mm diameter enameled copper wire on a 3.6mm diameter steel bolt and the antenna use a 15 cm long 0.6 mm diameter copper wire.
In the entire of the circuit can be included in the telephone itself or in the junction box. The power supply of the circuit is from the telephone line. The operation of the circuit is the transistor is wired as a Colpitts oscillator to produce oscillations in the FM transmission band. The audio signal from the telephone line is coupled to the base of the transistor to obtain the frequency modulation. The LED D1 is act as a power on indicator. Any radio frequency PNP transistor like A933 can be used for built the transistor. For L1 make 8 turns of 0.6 mm diameter enameled copper wire on a 3.6mm diameter steel bolt and the antenna use a 15 cm long 0.6 mm diameter copper wire.
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