The PAM8403 HW-104 Stereo Audio Amplifier Module is a compact, high-efficiency Class D amplifier capable of delivering 3W per channel with minimal distortion. Designed for DIY audio projects, Bluetooth speakers, and portable devices, this module provides crystal-clear stereo sound while consuming very little power. Its small PCB design and low heat generation make it ideal for battery-powered applications and compact electronic systems.

Features:

• High-Efficiency Class D Design: Energy-saving amplifier with >90% efficiency and low heat generation.

• Stereo Output: Dual-channel 3W + 3W output for balanced left-right audio performance.

• Wide Voltage Range: Operates from 2.5V to 5.5V DC, suitable for USB or lithium battery-powered systems.

• Compact Size: Small PCB (30mm x 20mm) for easy integration in tight enclosures.

• Low Distortion & Clear Sound: Ensures clean audio with low THD (≤10%) and high SNR (≥85 dB).

• No Heat Sink Required: Efficient Class D design eliminates the need for bulky cooling components.

• Easy to Use: Simple connection interface with labeled pins for power, speakers, and input signals.

• Compatible with Various Audio Sources: Works with smartphones, Bluetooth modules, MP3 players, and Arduino-based audio systems.

Specifications:

• Model: PAM8403 (HW-104)

• Amplifier Type: Class D

• Channels: 2 (Stereo)

• Output Power: 3W per channel (at 4Ω, 5V input, THD+N = 10%)

• Operating Voltage: DC 2.5V – 5.5V

• Efficiency: >90%

• Speaker Impedance: 4Ω – 8Ω

• Signal-to-Noise Ratio (SNR): ≥85 dB

• Total Harmonic Distortion (THD): ≤10%

• PCB Dimensions: Approx. 30mm x 20mm

• Weight: Approx. 3g

Applications:

• DIY Bluetooth speaker projects

• Portable and USB-powered audio systems

• Arduino and Raspberry Pi sound output modules

• Electronic toys and small gadgets

• MP3 and audio amplifier circuits

• Classroom and hobby electronic projects

• Battery-operated sound devices

How to Use:

• Connect VCC and GND pins to a 3.7V–5V DC power supply (e.g., USB or lithium battery).

• Connect L and R speaker outputs to 4Ω–8Ω speakers.

• Connect AUDIO IN L and AUDIO IN R to your sound source (Bluetooth module, audio jack, or DAC).

• Adjust volume externally from the audio source (the module does not include a potentiometer).

• Ensure proper polarity and wiring before powering up.

Benefits:

• Compact and efficient for small enclosures and low-power devices.

• Delivers clean, stereo-quality sound at low voltage.

• Ideal for battery-driven audio projects.

• Easy integration with microcontrollers and audio modules.

Package Includes:

• 1 x PAM8403 HW-104 Stereo Audio Amplifier Module

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