The system block diagram is as follows. It is a typical superheterodyne architecture. Although the sparrow is small, the key local oscillator - mixing - filtering - mid-amp - demodulation - audio amplification are all present. In fact, the sensitivity sounds good and the sound quality is relatively clear. Since the circuit is very simple, the stability and image suppression are relatively poor, but it is amazing to be able to ring. You no longer need to rely on those semi-finished si47xx. You can build a usable FM receiver based on the principle. machine.
For the specific working principle, you can come to my group to discuss 939236402
s53mv master’s website:
http://lea.hamradio.si/~s53mv/ukvradio/ukvradio.html
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