Encyclopedia of radio electronics and electrical engineering / radio reception
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In order for the radio to sound good on the VHF band, it must be accurately tuned to the received radio station. The fine-tuning indicator, the scheme of which is offered by the Bulgarian magazine "Radio Television Electronics", will help you with this.
The constant component of the FM demodulator is fed to a comparison circuit (comparator) made on four low-power silicon transistors, for example, KT315, KT361, and two LEDs AL102A-AL102V (see Fig.).
From the engine of the variable resistor R5, a reference voltage is supplied to the right arm of the comparator from a stabilized power source.
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