PAM 8403 ~5v 3Watt 2-Channel Stereo Audio Amplifier

The PAM8403 5V 3W × 2 Channel Stereo Audio Amplifier Module is a compact, high-efficiency Class-D digital power amplifier designed to deliver powerful and clear stereo sound from a low-voltage DC supply. 🎶🔊 Operating at ~5V DC, this module is perfect for portable speakers, Bluetooth audio systems, DIY sound projects, and embedded audio applications.

Built around the PAM8403 IC, this amplifier provides up to 3 Watts per channel (at 4Ω load) with low distortion, minimal noise, and high efficiency, making it ideal for battery-powered devices. Unlike traditional amplifiers, this Class-D module produces very little heat, eliminating the need for bulky heat sinks.

The board features left and right audio input pins, easy speaker output connections, and stable performance across a wide range of audio sources such as mobile phones, MP3 players, Bluetooth receiver modules, and computers. ⚡ Its small size and simple wiring make it extremely easy to integrate into compact audio projects.

Key Features:

✔ High-efficiency Class-D stereo amplifier
✔ 3W × 2 channel output power
✔ Low noise and low harmonic distortion
✔ Works directly from 5V DC supply
✔ Compact design – no heat sink required

PAM8403 Audio Amplifier Module – Pin Name & Description

Power Pins

• VCC (+5V):
  Power supply input pin. Connect a 2.5V–5.5V DC regulated power source. For best performance and maximum output power, a stable 5V DC supply is recommended. ⚡

• GND (Ground):
  Common ground pin for power supply and audio signal reference. Must be connected to system ground to ensure noise-free and stable audio output.

Audio Input Pins

• LIN (Left Channel Input):
  Analog audio input pin for the left audio channel. Connect this pin to the left output of an audio source such as a Bluetooth module, mobile phone, MP3 player, or audio decoder board. 🎵

• RIN (Right Channel Input):
  Analog audio input pin for the right audio channel. Connect this pin to the right output of the audio source for proper stereo sound reproduction.

• AGND / GND (Audio Ground):
  Ground reference for audio input signals. Ensures clean audio input and reduced noise when connected to the audio source ground.

Speaker Output Pins

• L+ (Left Speaker Positive):
  Positive output terminal for the left speaker. Connect directly to the left speaker’s positive terminal.

• L− (Left Speaker Negative):
  Negative output terminal for the left speaker. This pin is part of a BTL (Bridge-Tied Load) output and must NOT be connected to ground. 🔊

• R+ (Right Speaker Positive):
  Positive output terminal for the right speaker. Connect directly to the right speaker’s positive terminal.

• R− (Right Speaker Negative):
  Negative output terminal for the right speaker. This is also a BTL output and must remain isolated from ground to avoid damage.

Important Usage Notes

• Use 4Ω–8Ω speakers for optimal performance.

• Do not connect any speaker terminal to GND (BTL output design).

• Use short audio input wires and a clean power source to minimize noise.

• Add a volume control potentiometer at the audio input if volume adjustment is required.