Bluetooth Audio Amplifier Board PAM8403 5W+5W Dual Channel - Portable

Our review of the Bluetooth Audio Amplifier Board examines a compact PAM8403-based module aimed at DIYers and small speaker projects. The bottom line: this little board is best for hobbyists who need a rechargeable, low-voltage amplifier that supports multiple inputs and can drive two small speakers at up to 5W per channel. It stands out for its built-in Bluetooth, SD/USB playback and 18650 battery support, which together make it a convenient, portable solution for custom desktop or bookshelf speakers.

Key Features

• Dual-channel 5W+5W: Provides independent stereo output so two small speakers can be driven with clear, low-distortion sound at modest volumes.
• Onboard lithium battery support: Uses a single 18650 cell for portable operation and convenient recharging via the 5V Micro USB input.
• Multiple input methods: Accepts Bluetooth wireless, SD card and USB flash drive playback so sources can be switched without rewiring.
• Simple front controls: Physical buttons offer volume, track skip, pause and power functions for hands-on operation without a phone.
• Long Bluetooth range: Claimed transmission up to 20m in open space, useful for typical room setups and casual wireless listening.
• Auto-play convenience: When powered on the board will automatically read and play from an inserted SD card or USB drive for unattended playback.

Who It's For

This board is aimed at electronics hobbyists, makers and small-scale speaker builders who want a low-voltage, rechargeable amplifier with flexible inputs and Bluetooth pairing. It is a practical choice for building portable Bluetooth speaker projects, refurbishing small bookshelf speakers, or adding wireless playback to existing enclosures.

Those who need high power, audiophile-grade fidelity, balanced XLR inputs, or heavy-duty home theater amplification should look elsewhere; this module is optimized for convenience, portability and DIY integration rather than large-room sound or professional installations.

Pros & Cons

Pros

• Compact and easy to integrate into DIY speaker projects with clear labeling and simple wiring.
• Multiple playback options (Bluetooth, SD card, USB) reduce dependency on a phone or external source.
• Rechargeable via 5V Micro input using a common 18650 cell for true portability.

Cons

• Maximum output is modest at 5W per channel, so it is not suited to large rooms or high-volume listening.
• Battery not included, so buyers must source and install a correctly polarized 18650 cell themselves.

Specifications

Product Name	Bluetooth Digital Amplifier Board Dual 5W
Chip Model	PAM8403
Supply Voltage	5V Micro USB input
Maximum Power	5W + 5W
Battery	18650 lithium battery x1 (NOT included)
Inputs	Bluetooth, SD card, USB flash
Bluetooth Range	Up to 20m (no blocking)

Our Verdict

This PAM8403 Bluetooth amplifier board is a practical, low-cost option for makers building portable or compact stereo speakers. It offers convenient rechargeable operation, multiple input modes and straightforward controls, making it good value for DIY projects where modest power and portability matter more than high SPL or pro audio features.

Frequently Asked Questions

Does the board include a battery?
The board requires one 18650 lithium cell but the battery is not included and must be installed separately with correct polarity.

How is the board powered and charged?
Power is supplied by a single 18650 battery and the board can be recharged via the 5V Micro USB charging input.

Can it play without a Bluetooth source?
Yes, it supports direct playback from an inserted SD card or USB flash drive which will auto-play when the board is switched on.