PAM8403 Stereo Audio Amplifier Module 3W×2 with Volume Control

PAM8403 Digital Audio Amplifier Module – 3W×2 with Volume Control

Upgrade your DIY audio projects with the PAM8403 Digital Audio Amplifier Module — a compact, high-efficiency stereo amplifier board delivering crystal-clear, high-fidelity sound. Measuring just 30 × 20 × 15 mm, this tiny powerhouse fits seamlessly into custom speaker builds, Arduino projects, Raspberry Pi setups, and more.

Key Features

• High-Fidelity Stereo Output: Delivers up to 3W × 2 channels (at 4Ω) of clean, distortion-free audio — perfect for small to medium speaker enclosures and DIY audio builds.
• Built-In Volume Control: Onboard potentiometer lets you dial in the perfect listening level without any additional components.
• USB-Powered Convenience: Powers directly via USB (5V DC), making it easy to integrate into portable setups, desktop rigs, or any USB-equipped device.
• Dual-Channel (2-Channel) Stereo: True stereo amplification with two independent output channels for a full, immersive soundstage.
• Compact & Lightweight: The ultra-small footprint (30 × 20 × 15 mm) makes it ideal for space-constrained enclosures and embedded projects.
• Low Noise, Class-D Efficiency: Class-D amplifier topology ensures high power efficiency with minimal heat generation — no bulky heatsink required.
• Broad Compatibility: Works with a wide range of audio sources including smartphones, tablets, computers, microcontrollers, and media players.
• Easy Integration: Clearly labeled input/output pads make wiring straightforward for hobbyists and engineers alike.

Specifications

• Chipset: PAM8403
• Output Power: 3W × 2 (at 4Ω load)
• Operating Voltage: 5V DC (USB-powered)
• Channels: 2 (Stereo)
• Amplifier Class: Class-D
• Dimensions: 30 × 20 × 15 mm
• Volume Control: Onboard potentiometer

Ideal For

• Arduino & Raspberry Pi audio projects
• DIY Bluetooth speaker builds
• Custom desktop speakers
• Robotics and embedded sound systems
• Hobbyist electronics and maker projects

For more information on electronics safety standards and best practices in DIY electronics, visit the U.S. Consumer Product Safety Commission (CPSC).

Frequently Asked Questions

Q: What is the PAM8403 Audio Amplifier Module and what can it do?

A: The PAM8403 Audio Amplifier Module is a compact Class-D stereo amplifier board capable of delivering up to 3W per channel (3W × 2) at a 4Ω load. It features an onboard volume control potentiometer and is powered via USB (5V), making it an excellent choice for DIY speaker systems, Arduino audio projects, Raspberry Pi builds, and a wide variety of embedded electronics applications.

Q: How do I connect the PAM8403 module to a speaker or audio source?

A: The module features clearly labeled solder pads for left/right audio inputs, speaker outputs (L+, L−, R+, R−), and a 5V USB power input. Simply connect your audio source (e.g., 3.5mm jack breakout, DAC, or microcontroller audio output) to the input pads, wire your speakers (4Ω recommended) to the output pads, and power the board via USB. Adjust volume using the onboard potentiometer knob.

Q: What speaker impedance is compatible with this amplifier module?

A: The PAM8403 module is rated for 4Ω speakers at full 3W × 2 output. It can also work with 8Ω speakers, though output power will be lower. For best performance and audio quality, use 4Ω speakers matched to your enclosure design.

Q: Does the PAM8403 module require a heatsink?

A: No heatsink is required. The PAM8403 uses Class-D amplifier technology, which is highly power-efficient and generates very little heat during normal operation, making it safe and practical for compact, enclosed builds without additional cooling.