LED
LCD
Product Description
A high-efficiency 5W+5W dual-channel stereo digital audio amplifier module featuring independent onboard volume potentiometers, ideal for portable speakers and multimedia sound systems in Arduino and microcontroller projects. This compact class-D/class-AB selectable audio hub breaks out the advanced PAM8406 chip, delivering clean, high-fidelity sound reproduction directly into standard 4-ohm or 8-ohm speaker cones without requiring massive external heatsinks. It features two individual multi-turn trimmer potentiometers that allow users to fine-tune the left and right audio gains independently to balance audio channels or match ambient sound requirements. Engineered with comprehensive short-circuit, thermal, and over-current protection circuits, it offers an incredibly power-efficient, low-noise amplification solution for battery-powered or USB-driven custom audio builds.
Pinout / Layout Connections
The module breaks out its audio and power routing paths via labeled through-hole solder pads:
5V / GND Pads: Connect to a stable +5V DC positive power supply line and common system ground.
L / G / R Input Pads: Audio signal input terminals for the Left channel, common audio Ground, and Right channel.
L+ / L- Output Pads: Differential bridged speaker outputs dedicated to the Left audio channel.
R+ / R- Output Pads: Differential bridged speaker outputs dedicated to the Right audio channel.
Warning: Do not connect the negative output pads (L- and R-) together or to system ground, as this will damage the amplifier.
Applications
DIY Portable Bluetooth Speakers: Perfect for building compact handheld soundboxes, custom boomboxes, and wireless media audio nodes.
Robotics Sound Effects: Excellent for adding voice synthesis circuits, alerts, and high-volume playback modules to interactive automated systems.
Arcade Machine Retros: Ideal for integrating low-profile stereo sound setups into retro tabletop arcade cabinets and handheld gaming kits.
Compatibility
The PAM8406 amplifier operates within standard low-voltage logic and audio ranges, making it fully compatible with:
MP3 Decoder Boards & Bluetooth Modules (MH-M18, MH-M28, MH-M38, DFPlayer Mini).
Arduino Board Series (Uno, Mega, Nano) for amplifying basic tone generation or wave shields.
Raspberry Pi and ESP32 boards via their native 3.5mm stereo jacks or audio DAC pins.
Standard 5V USB Power Banks and single-cell LiPo batteries utilizing a 5V boost converter.
Technical Specifications
| Parameter | Value / Specification |
| Standard Part Number | PAM8406 Amplifier Module |
| Operating Voltage | DC 2.5 V to 5.5 V (Recommended 5.0 V) |
| Output Power | 5 W + 5 W Stereo (at 5V supply into $2\ \Omega$ load) / 3 W + 3 W (into $4\ \Omega$ load) |
| Speaker Impedance Compatibility | Supports $2\ \Omega$, $4\ \Omega$, and $8\ \Omega$ speakers |
| Amplifier Architecture | Class-D / Class-AB Alternative Configurable Design |
| Efficiency | Up to 90% in Class-D mode |
| Onboard Controls | Dual independent volume adjustment potentiometers (Left and Right) |
What’s in the Box
1 x PAM8406 Digital Amplifier Module with Onboard Volume Potentiometers.
