SI4732 breadboard receiver: On-board speakers and amplifier to enjoy the stereo sound

I implemented two speakers and amplifier (JRC2073D with on/off switch) on my SI4732 breadboard receiver to enjoy the stereo sound of the receiver with SI4732. The small speakers on board are sufficient for me to enjoy stereo sound, but connecting to external speakers provides even better sound quality.

This home-made receiver is differs from a commercially available ATS-20 receiver in the following points.

FM stereo sound can be enjoyed with the on-board speakers
Extra audio mute circuit is implemented to prevent loud popping of the speaker
It is equipped with a circuit to monitor the remaining battery level

I started hobby electronics work a year ago (May, 2021) and really enjoy assembling and modifying my home-made receiver. I have made this SI4732 receiver based on the information (e.g. circuit diagram) by Ricardo Caratti in the following link.

PU2CLR SI4735 Library for Arduino by Ricardo Caratti
https://github.com/pu2clr/SI4735

Link to the sketch V3.0.7g (ATS-20_bat_mod v2) by VE3XLT, CA2PEY and PU2CLR
https://github.com/patomoi/ATS-20-Sta...