An Arduino Due forms the heart of the project ... an LM4811 headphone amplifier for private listening, and a PAM8403 Class D audio amplifier for the built-in loudspeaker. The enclosure is made ...

Here, Arduino’s (Uno R3) A4 (SDA ... of the radio to the line input of the PAM8403 audio module. Finally, pick an external 5-VDC/USB power supply to run the audio module. Quick tip: Because the ...