PAM8403 5V Mini Digital Stereo Amplifier Module 2×3W Class-D Audio Amp Board

The PAM8403 5V Mini Digital Stereo Amplifier Module is a compact, low-power 2-channel Class-D audio amplifier board designed for DIY speakers, portable audio systems, Arduino projects, robotics, Bluetooth speaker builds and embedded electronics applications.

Powered from a 5V DC supply, the PAM8403 amplifier can provide up to 3W + 3W stereo output with 4Ω speakers under the IC's specified conditions. Its Class-D architecture provides high efficiency, making it particularly useful for battery-powered and space-constrained projects.

Because the module works from a low-voltage supply, it is convenient for projects powered through USB, 5V adapters, power banks and suitable battery-based power systems. Modules sold in Bangladesh commonly target DIY audio projects and portable speaker applications.

Its small size makes it a practical choice when you need to add stereo audio amplification without using a large amplifier circuit.

Why Choose PAM8403?

The PAM8403 is popular among electronics students, hobbyists and engineers because it provides a useful combination of small size, stereo output, low-voltage operation and high efficiency. The manufacturer specifies short-circuit protection and thermal shutdown, along with efficiency up to approximately 90%.

Ideal For

Arduino and microcontroller projects, DIY Bluetooth speakers, MP3 player projects, portable speaker systems, robotics projects, small desktop speakers, embedded audio devices, educational electronics projects and custom audio builds.

Specifications:

The exact PCB layout, dimensions, potentiometer, terminal type and onboard components can vary between PAM8403 module versions. Some commercially available boards include a volume-control potentiometer or power switch.

Features:

2×3W Stereo Output
Provides stereo amplification for two speakers, with the PAM8403 specified for up to 3W per channel into 4Ω at 5V under the stated distortion condition.

5V Low-Voltage Operation
Suitable for common 5V power sources such as USB supplies and many microcontroller-based projects.

Class-D Efficiency
The Class-D architecture provides high efficiency, helping reduce power loss compared with traditional linear amplifier designs.

Compact Design
The miniature PCB is useful for portable electronics and projects where PCB space is limited.

Stereo Audio
Separate left and right channels make the module suitable for stereo speaker applications.

DIY Friendly
A good choice for students, hobbyists, makers and engineers building custom audio equipment.

Low Power Consumption
Its efficient architecture makes it suitable for portable and battery-powered applications.

Applications:

The PAM8403 amplifier module can be used in:

DIY Bluetooth Speakers
Build a small stereo speaker system with a Bluetooth audio receiver and 5V power supply.

Arduino Projects
Amplify audio generated or processed by Arduino-compatible electronics.

Raspberry Pi Projects
Use it as a compact analog audio amplifier for suitable Raspberry Pi projects.

Portable Speakers
Its small footprint and low-voltage operation are useful for battery-powered sound systems.

Robotics Projects
Add voice, notification tones or sound effects to robots and embedded systems.

MP3 Player Projects
Drive small speakers from an audio player module.

Educational Electronics Projects
Excellent for learning about Class-D amplification, audio signals and stereo speaker wiring.

PAM8403 Speaker Compatibility

For maximum specified output, the PAM8403 is designed to drive a 4Ω speaker load at 5V. The official IC specification gives 3W output at 10% THD with a 4Ω load and 5V supply.

An 8Ω speaker can also be used in many practical applications, although the available output power will generally be lower than the maximum 3W-per-channel figure.

Always check the specific module's PCB markings and specifications before connecting speakers.

PAM8403 Wiring Overview

Typical connections are:

Important

The PAM8403 uses bridge-tied output stages, so the speaker negative terminals should not be treated as a common ground. Connect each speaker to its corresponding positive and negative output terminals.

Do not connect the speaker output terminals directly to ground.