Fm Transmitter Circuit Diagram. This is circuit of 5km long range fm radio transmitter circuit. The figure below shows the schematic of the transmitter which consists of two stages.
Fm transmission is done by the process of audio pre amplification modulation and then transmission. An oscillator and an output amplifier. A fm transmitter is a device that uses the principles of frequency modulation to broadcast sound supplied at its input.
The circuit diagram shown for fm transmitter circuit and the electronic components are the resistor capacitor trimmer or variable capacitor inductor coil transmitter mic 9v of power supply or 7809 voltage regulator in case if you are using input voltage more than 9v and an antenna.
The audio signal to be transmitted is coupled to the base of q1 through capacitor c2. Soldering surface mounted devices is not so hard and actually is quite easy. This fm modulator can be operated between 76 to 108mhz. The transistor q1 and q2 forms a classic high sensitive preamplifier stage.
