Superheterodyne pocket radio receiving circuit

Shown is a more heterodyne radio receiver circuit. As can be seen from the figure, there are multiple resonant circuits, and L1 and vc connected to the antenna end
form a resonant circuit. It resonates on a certain program carrier frequency of the tuned broadcast and is used to select the FM program of the radio station. The signal received by the antenna
passes through the frequency selection of the resonant circuit and then goes to the base of the high-frequency amplification and mixing transistor. At the same time, the local oscillator signal is also sent to the base of the high-frequency amplification and mixing transistor . Among them, the transistor with high-frequency amplification and mixing functions is the receiving circuit of the radio .