PAM8403 5W Stereo Bluetooth Audio Receiver Amplifier & 18650 Battery Charger Module User Guide

📋 Introduction

The PAM8403-based amplifier module is a compact and versatile solution for creating your own audio projects. It combines a Bluetooth receiver, MP3 player, a powerful Class D amplifier, and a battery charger into a single convenient module, allowing you to play audio from various sources, including Bluetooth, TF (MicroSD) card, and USB drives. This module provides 5W+5W of stereo output power, suitable for small to medium-sized speakers.

Features

• Multiple Audio Inputs: Bluetooth, TF (MicroSD) card, and USB drive support.
• Bluetooth Connectivity: Wireless audio streaming from smartphones, tablets, and other Bluetooth-enabled devices.
• High Efficiency: 90% efficiency thanks to the Class D amplifier design.
• Power Output: 3W (left channel) + 3W (right channel) output power into a 4Ω speaker load with a 5V power supply.
• Integrated 18650 Battery Charger: Conveniently charges a standard 18650 lithium-ion battery.
• Noise Cancellation: Built-in noise-canceling circuit for clear audio.
• Power Switch and Volume Control: Integrated power switch and volume control using a single knob.
• Compact Design: Small form factor for easy integration into projects.

📊 Module Overview

Key Components and Connectors

• 18650 Battery Holder: Holds a standard 18650 lithium-ion battery. Important: Observe correct polarity when inserting the battery!
• TF (MicroSD) Card Slot: For playing MP3 files stored on a TF card.
• USB Port: For playing MP3 files stored on a USB drive.
• Micro USB Charging Port: For charging the 18650 battery.
• Speaker Output Terminals (OUTL, OUTR): Connect to your speakers.
• Power Switch/Volume Control Knob: Turns the module on/off and adjusts the volume. Turn fully counter-clockwise to turn off.
• Function Buttons:
  • PREV/V-: Previous track / Volume Down (Long Press)
  • NEXT/V+: Next track / Volume Up (Long Press)
  • PLAY: Play/Pause
  • MODE: Switches between TF card and USB drive playback.
• Charging Indicator LEDs:
  • CHARGE (Red): Lights up while the battery is charging.
  • FULL (Green): Lights up when the battery is fully charged.
• Power Indicator LED (Blue): Lights up when the module is powered on.
• VIN: Power input (5V). Note: This is primarily used to charge the battery; the module is designed to operate from the 18650 battery.

📌 Wiring and Connections

1. Power Supply:
   • Insert a fully charged 18650 lithium-ion battery into the battery holder, ensuring correct polarity (+ and -).
   • Alternatively, you can provide power via the Micro USB port. This will also charge the battery if one is installed. You can use a computer USB port, USB power bank, or a mobile phone charger (5V) as a power source.
2. Speaker Connections:
   • Connect your speakers to the speaker output terminals (OUTL and OUTR).
   • Important: Ensure correct polarity when connecting the speakers. Typically, the red wire is connected to the positive (+) terminal, and the black wire is connected to the negative (-) terminal.
   • The module is designed for 4Ω speakers. Using speakers with significantly different impedance may affect performance.

💻 Operation

1. Powering On/Off:
   • Turn the power switch/volume control knob clockwise to power on the module. A click sound indicates the module is on.
   • Turn the knob fully counter-clockwise to power off the module.
2. Volume Control:
   • Adjust the volume by rotating the power switch/volume control knob.
3. Audio Playback:
   • Bluetooth Mode:
     • Remove the TF card and USB drive.
     • Power on the module.
     • Enable Bluetooth on your smartphone, tablet, or other Bluetooth-enabled device.
     • Search for available Bluetooth devices.
     • Select “HW-BT” from the list of available devices.
     • Once paired, you can stream audio from your device to the module.
   • TF Card/USB Drive Mode:
     • Insert a TF card or USB drive containing MP3 files into the corresponding slot/port.
     • Power on the module.
     • The module will automatically begin playing the MP3 files.
     • If both TF card and USB drive are inserted, the module will prioritize the TF card.
     • Use the MODE button to switch between TF card and USB drive playback.
   • Playback Controls:
     • PLAY: Press to pause or resume playback.
     • PREV/V-: Short press to play the previous track. Long press to decrease the volume.
     • NEXT/V+: Short press to play the next track. Long press to increase the volume.
4. Battery Charging:
   • Connect a 5V Micro USB power source to the Micro USB charging port.
   • The CHARGE (Red) LED will illuminate, indicating that the battery is charging.
   • The FULL (Green) LED will illuminate when the battery is fully charged.
   • Note: It is recommended to use a 5V/1A or 5V/2A power adapter for charging.

🛠️ Troubleshooting

🛒 Where to Buy the PAM8403 5W Stereo Bluetooth Receiver Charger

Ready to get started with the PAM8403 Bluetooth Module? You can purchase it directly from our store:

PAM8403 Bluetooth Module — Envistia Mall

⚠️ Safety & Handling Precautions

• Ensure correct polarity when inserting the 18650 battery.
• Do not expose the module to extreme temperatures or humidity.
• Do not disassemble the module.
• Use appropriate speakers with the correct impedance (4Ω recommended).
• Disconnect the power source before making any wiring changes.