Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes a Bluetooth audio receiver, a PAM8403 amplifier with volume control, two loudspeakers, a TP4056 battery charging module, and a 18650 Li-ion battery. The circuit is designed to receive audio signals via Bluetooth, amplify them, and output the sound through the loudspeakers. The TP4056 module is used to charge the 18650 Li-ion battery, which powers the entire circuit.

Component List

1. Loudspeaker

   • Description: Converts electrical audio signals into sound.
   • Pins: pin1, pin2

2. TP4056

   • Description: Battery charging module for 18650 Li-ion batteries.
   • Pins: OUT-, B-, B+, OUT+, IN-, IN+

3. 18650 Li-ion Battery

   • Description: Rechargeable lithium-ion battery.
   • Pins: -, +

4. Bluetooth Audio Receiver 5.0

   • Description: Receives audio signals via Bluetooth.
   • Pins: Pin L, Pin GND, Pin R, Supply -, Supply +

5. PAM8403 with Volume Control

   • Description: Audio amplifier with volume control.
   • Pins: Input R, Input GND, Input L, Power +, Power -, SPK L -, SPK L +, SPK R +, SPK R -, Power + (after switch)

Wiring Details

Loudspeaker 1

• pin1 connected to PAM8403 with Volume Control at SPK L -
• pin2 connected to PAM8403 with Volume Control at SPK L +

Loudspeaker 2

• pin1 connected to PAM8403 with Volume Control at SPK R -
• pin2 connected to PAM8403 with Volume Control at SPK R +

TP4056

• OUT- connected to Bluetooth Audio Receiver 5.0 at Supply - and PAM8403 with Volume Control at Power -
• B- connected to 18650 Li-ion Battery at -
• B+ connected to 18650 Li-ion Battery at +
• OUT+ connected to PAM8403 with Volume Control at Power +

18650 Li-ion Battery

• - connected to TP4056 at B-
• + connected to TP4056 at B+

Bluetooth Audio Receiver 5.0

• Pin L connected to PAM8403 with Volume Control at Input L
• Pin GND connected to PAM8403 with Volume Control at Input GND
• Pin R connected to PAM8403 with Volume Control at Input R
• Supply - connected to TP4056 at OUT- and PAM8403 with Volume Control at Power -
• Supply + connected to PAM8403 with Volume Control at Power + (after switch)

PAM8403 with Volume Control

• SPK L - connected to Loudspeaker 1 at pin1
• SPK L + connected to Loudspeaker 1 at pin2
• SPK R - connected to Loudspeaker 2 at pin1
• SPK R + connected to Loudspeaker 2 at pin2
• Power - connected to TP4056 at OUT- and Bluetooth Audio Receiver 5.0 at Supply -
• Power + connected to TP4056 at OUT+
• Input L connected to Bluetooth Audio Receiver 5.0 at Pin L
• Input GND connected to Bluetooth Audio Receiver 5.0 at Pin GND
• Input R connected to Bluetooth Audio Receiver 5.0 at Pin R
• Power + (after switch) connected to Bluetooth Audio Receiver 5.0 at Supply +

Code

No microcontroller code is provided for this circuit.