Radio tuning indication circuit

Single chip microcomputer STM32L151CCU6

Adjustable capacitor Murata genuine original

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The semiconductor radio tuning indicator circuit is shown below. When the tuning is accurate, the AGC voltage is the lowest, the emitter current of VT1 is the smallest, the emitter voltage drop is also the smallest, the emitter current anvil of VT2 is the smallest, and the light emitted by the LED VD is the darkest; Offset, the light from the LED is enhanced. Accurate tuning is possible based on this feature.