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The MH-M38 Bluetooth Audio Receiver Module is a compact all-in-one Bluetooth audio solution that combines a Bluetooth 4.2 receiver with a built-in 2 × 5W Class-D stereo amplifier. Designed for DIY Bluetooth speakers, portable audio systems, and educational electronics projects, it can drive two passive speakers directly without requiring an external amplifier. With support for high-quality audio formats, USB sound card functionality, and both USB and battery power options, the MH-M38 is an excellent module for learning about wireless communication, digital audio, and amplifier design while building practical audio projects.
Key Features
• Bluetooth 4.2 wireless audio receiver
• Built-in 2 × 5W Class-D stereo amplifier
• Drives two passive speakers directly
• Supports automatic Bluetooth re-connection
• High-quality stereo audio playback
• Supports MP3, WAV, WMA, FLAC and APE formats
• USB sound card functionality for PC connection
• Operates from 5V USB power or a single 3.7V lithium battery
• Compact PCB for DIY enclosures and portable projects
What’s Included
• 1 × MH-M38 Bluetooth Audio Receiver Module
Note: Speakers, battery, power supply, cables, and enclosure are not included.
Curriculum Links
Australian Curriculum (v9.0):
• ACTDEK042 – Investigate how electrical and electronic systems are designed and controlled
• ACTDEP050 – Produce designed solutions using appropriate technologies and processes
Victorian Curriculum:
• VCDSTS039 – Technologies systems
• VCDSCD041 – Producing designed solutions
NSW (Stage 4–5 Technology Mandatory):
• TE4-2DP – Designs and produces solutions
• TE4-5AG – Applies problem-solving, evaluation, and testing skills
Classroom Use / Learning Outcomes
Students will:
• Understand Bluetooth wireless communication principles
• Learn how Class-D audio amplifiers operate
• Connect and test stereo speaker systems
• Explore digital audio transmission and playback
• Investigate power supply design and speaker impedance
Teacher Benefits
• Excellent demonstration of wireless audio technology
• Simple integration into electronics and STEM projects
• Suitable for Arduino and micro controller-based audio systems
• Encourages practical learning in audio electronics and power management
• Compact module requiring minimal external components
Important Notes
• Use a regulated 5V, 2A power supply for best performance.
• Do not connect the speaker outputs to another amplifier, as the MH-M38 already contains a built-in power amplifier.
• When using a lithium battery, an external charging and protection circuit (such as a TP4056 with protection) is required.
• When connected to a computer via USB, the module functions as a USB sound card and Bluetooth mode is disabled until powered from a standard USB power supply.
Typical Applications
• DIY Bluetooth speakers
• Portable music players
• Classroom audio demonstrations
• Bluetooth speaker upgrades
• Educational electronics kits
• Battery-powered audio systems
Perfect For
• Audio electronics projects
• Bluetooth speaker construction
• STEM and classroom learning
• Arduino and microcontroller projects
• Portable sound systems
Lesson Duration
60–120 minutes (assembly, wiring, and testing)
Technical Specifications
• Model: MH-M38
• Bluetooth Version: Bluetooth 4.2
• Bluetooth Profiles: A2DP, AVRCP
• Audio Decoding: MP3, WAV, WMA, FLAC, APE
• Amplifier Type: Class-D stereo amplifier
• Output Power: 2 × 5W (4Ω speakers)
• Recommended Speaker Impedance: 4Ω, 3–5W (supports 2–8Ω speakers)
• Supply Voltage: 5V DC via USB C or 5V input
• Alternative Power: 3.7–4.2V lithium battery (VBAT input)
• Recommended Supply Current: 5V, 2A regulated supply
• Wireless Range: Up to 15 metres (line of sight)
• USB Function: USB sound card (plug-and-play with PC)
• Audio Outputs: Left and right speaker outputs (L+, L−, R+, R−)
• Dimensions: Approximately 45 × 20mm
