PAM8403 Mini 5V Digital Audio Amplifier Board – 3W+3W Dual-Channel Class D Stereo Module

Product Description

The PAM8403 Mini 5V Digital Audio Amplifier Board is an ultra-compact, high-efficiency Class D stereo module capable of delivering 3 watts of power per channel. Despite its micro size, it provides exceptional sound quality and high volume, making it the industry standard for portable DIY audio projects. At Robogears, we recommend this module for battery-operated applications because its Class D architecture is highly efficient, allowing for longer playback times compared to traditional Class AB amplifiers. It is perfectly suited for use with 5V USB power, lithium batteries, or microcontrollers like Arduino and ESP32 to create custom Bluetooth speakers or voice-enabled robotics.

+3

Detailed Key Features

• High Efficiency Class D Architecture: Converts over 90% of power into sound, minimizing heat generation and extending battery life for portable devices.

• Filterless Design: The PAM8403 chip features a specialized output stage that drives speakers directly without the need for bulky low-pass LC filters, reducing overall project size.

• Dual-Channel Stereo: Provides independent Left and Right channel outputs for a full stereo experience in a module smaller than a postage stamp.

• Low Noise Interference: Designed with superior noise suppression, ensuring no "pop" sound during power-on or power-off cycles.

• USB/Battery Compatibility: The 2.5V to 5.5V operating range is perfectly calibrated for single-cell Li-ion batteries (3.7V) or standard 5V USB power supplies.

All Technical Details

• Short Circuit Protection: Includes integrated thermal shutdown and short-circuit protection to prevent damage during accidental miswiring.

• Input Sensitivity: Compatible with standard line-level audio signals from smartphones, MP3 players, and Bluetooth modules.

• Speaker Compatibility: Works best with 4Ω or 8Ω permanent magnet speakers.

• Pin Configuration: Features clearly labeled solder pads for $L_{in}$, $R_{in}$, $GND$, $VCC$, and independent speaker outputs ($L+/L-$ and $R+/R-$).