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Wireless FM transmitter coil principle

2016-04-10 20:46  
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Next is a wireless FM  transmitter  coil principle. The principle is very simple and very practical. The proposed combination of text to read the diagram, so you can more efficiently grasp the principle. N1 is working as an audio amplifier. The audio signal after amplification, from the microphone back to the varycap diode. Varycap capacitance change signal and hence the oscillation frequency to frequency modulation. RF oscillator using the inverter N2 and 10.7 mhz ceramic filter is driving the parallel combination of silicon ceramics for N6 through N3. Because these are the parallel inverter output impedance is low, so that it can directly drive a 1/4th wavelength antenna. Since N4-N6 is a square wave output will be a large number of harmonics in it. Ninth harmonic MHz (96.3 MHz) will thus become the center of FM band.


Coilless FM transmitter !


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