FM radio tuning circuit circuit
Posted on Nov 10, 2015 5282
32.FM radio circuit ; FM radio tuning circuit circuit (2) FET circuit in FM radio application tuning circuit is shown in Figure FM radio circuit, which is composed of a high fr
equency amplifier VT1, VT3 mixer and local oscillator VT2 and other parts of. FM radio antenna sensing signal, the input transformer Li added, rri gate transistor, VT1 high frequency discharge main amplifier device, after it amplifies the FM frequency signal transformer L2 is applied to the gate of the mixer circuit VT3 pole, yrl2 and LC resonant circuit configuration cost local oscillator, the oscillation signal from the oscillation transformer din secondary source sent to the mixer circuit VT3 pole. Mixer circuit VT3 output from the drain, the intermediate frequency transformer IFT (L4) 10.7 MHz IF output signal.