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    FM microphone made using non-door circuits (English) ---- fm Transmitter Using Logic Gates

     

    FM microphone made using non-door circuits (English), FM Transmitter Using Logic Gates Keywords: CD4069, FM circuit diagram .... This is a FM Transmitter circuit This circuit uses logic gates This transmitter circuit has a RF oscillator This oscillator uses 10.7Mhz ceramic filter and inverter N2 to drive the parallel combination of N4 to N6 through N3 Here is the circuit: The output impedance will be low because these inverters are in parallel, so an aerial of 1 / 4h wavelength can be driven directly. There would be a lot of harmonics in the output of N4-N6 because the output of N4 to N6 is square wave . The 9th harmonics of 10.7Mhz (96.3Mhz) will hence be at the center of the FM band. As an audio amplifier, this circuit uses N1. It will amplify audio signals from the microphone and fed it to varycap diode. The capacitance of ....................

     

     

     

     

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