2 x 5W Bluetooth Amplifier Board 3.7V-5V - Compact Audio Module

In this review the 2 x 5W Amplifier Board is presented as a compact, low-voltage audio module aimed at DIY audio builders and small portable speaker projects. The single biggest reason to consider it is the combination of Bluetooth 5.0 connectivity and a configurable 10W total output on a small PCB that runs from a single lithium cell or 5V supply. For makers who need hands-free calling, external buttons and the option to drive two 4 ohm satellite speakers directly, this board offers clear practical value without the bulk of a full amplifier enclosure.

Key Features

• Bluetooth 5.0: Provides a stable wireless input and low-latency connection for phones and tablets, making pairing and streaming straightforward.
• Dual 5W channels: The board is set up for stereo output with a maximum configurable power of 10W total, suitable for small left and right satellite speakers.
• Low-voltage operation: Runs from DC 3.7V to 5V so it can be powered by a single lithium battery or a 5V supply for portable use.
• Hands-free calling: Integrated call handling lets the module act as a speakerphone when paired to a mobile device.
• Charging and power control: USB is used as the charging input for the lithium battery and the board includes a micro power switch and charge indicator light for convenience.
• External amplifier output: An OUT audio terminal allows feeding a separate power amplifier if more drive is required.

Who It's For

The amplifier board is best for hobbyists, makers and small-scale installers who need a compact Bluetooth amplifier that can run from a single-cell 3.7V lithium battery or a 5V supply. It is suited to DIY portable speaker builds, desktop audio add-ons, and projects where hands-free calling and simple external button control are required.

It is less appropriate for high-power home theater use or large loudspeakers that need sustained high current. Buyers who require built-in power supplies, enclosures or guaranteed high-current delivery beyond 1.5A to 2A should look for a dedicated amp or powered speaker solution instead.

Pros & Cons

Pros

• Compact PCB design with both Bluetooth 5.0 and AUX input for flexible sourcing of audio.
• Configurable total output to 10W (5W per channel) suits small stereo satellite speakers.
• Integrated charging input and indicator plus hands-free calling functionality add convenience for portable builds.
• External OUT terminal enables use with a larger power amplifier if more output is needed.

Cons

• Requires a reliable 1.5A-2A power source; weaker batteries can cause restarts or distortion.
• No enclosure or heatsinking included, so thermal management is the responsibility of the builder.

Specifications

Brand	Mugast
Bluetooth	5.0
Voltage	DC 3.7V-5V
Current	1.5A-2A recommended
Power	2 x 5W (configurable to 10W total)
PCBA size	approx. 40 x 34 x 9mm (including terminal)
Package weight	approx. 40 g

Our Verdict

For DIY builders who need a compact Bluetooth amplifier board that runs from a single-cell battery or a 5V supply, this module is a practical and cost-effective choice. It combines Bluetooth 5.0, hands-free calling and configurable stereo output, but requires a stable 1.5A-2A power source and some attention to thermal and enclosure design to avoid restart or distortion under load.

Frequently Asked Questions

Can this board be powered by a single 3.7V lithium battery?
Yes, it supports DC 3.7V operation, but the battery must be able to supply 1.5A-2A continuous current to avoid instability.

Does the board include a charging circuit?
Yes, USB serves as the charging input for the lithium battery and a red indicator light shows charging status.

Can I drive larger speakers by using the OUT terminal?
The OUT audio terminal allows feeding an external power amplifier, but the onboard output is best suited for small 4 ohm satellite speakers.