Fm radio transmitter circuit above is one of the radio transmitter circuit is quite simple andeasy to make. Transmission distance can reach is about 2km. The circuit above uses a transistor and none use the IC so cheap enough to be a trial. Power supply requiredbetween 9 volts to 24 volts, the transmitter circuit 24 volt supply reaches the maximumtransmit power.
Fm transmitter circuit working principles are essentially the same with fm transmitter circuitin general. Input signal or amplified information signal before mixed and emitted.Transistors Q1 and Q2 function in the field of setting up and strengthening of the inputsignal. R9 is connected to the emitter of Q2 is useful to set the value of the gain or inputsignal amplification. Transistor Q3 is where modulation takes place, where the high frequency signal and information signal is mixed with frequency modulation method which will then be emitted by the antenna. To regulate the emission frequency depends on the value of C9
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