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The FM modulation wireless microphone circuit

2016-11-03 00:02  
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The FM modulation wireless microphone circuit
In the figure is the FM modulation wireless microphone circuit, in fact, this is the FM modulation commutator whose frequency is 80~90MHz. The working principle is as follows: the microphone converts the sound signal into the voltage signal which is added on the VT1 basic pole by the coupling capacitor C1, the current in the emitting pole is switched into the voltage, and the voltage change on R1 makes the collecting electrode voltage change, then the capacitor of the collecting pole changes and the oscillating frequency changes, which modulates FM. The modulating signal is emitted after it's been magnified by VT2.