Audio Bluetooth Module MH-M28 Wireless Receiver
The MH-M28 is a low-power Bluetooth module with Bluetooth V4.2 and dual-channel stereo audio playback. It supports lossless decoding formats such as WAV, WMA, FLAC, APE, and MP3. The Bluetooth range can reach up to 20 meters in open space, making it ideal for wireless audio reception and DIY audio applications.
Package Includes:
- 1 x Audio Bluetooth Module MH-M28 Wireless Receiver
Features:
- Bluetooth Version: V4.2
- Lossless decoding: WAV/WMA/FLAC/APE/MP3
- Stereo dual-channel output
- Bluetooth range: up to 20 meters (open area)
- Compact design, suitable for DIY audio projects
Blue Indicator Light:
- Fast blinking: No Bluetooth connection
- Always on: Bluetooth connected
- Slow blinking: Music playback in progress
Pinout of the Module:
| Pin Number | Pin Header | Description |
|---|---|---|
| 1 | 5V | Power-positive 5V |
| 2 | GND | Negative power-supply |
| 3 | VBAT | Lithium battery positive 3.7–4.2V |
| 4 | L | Left channel output |
| 5 | R | Right channel output |
| 6 | AGND | Audio ground |
Powering the Module:
You can power the module via a MICRO USB cable (5V) or use either a 5V regulated power supply or a 3.7V lithium battery.
- 5V input: Connect to 5V and GND pins
- 3.7V lithium battery: Connect to VBAT and GND
Audio Output:
Connect the audio output to a 3.5mm headphone jack or directly wire to a power amplifier input via L, R, and AGND pins.
Precautions & Warnings:
- Warning 1: Charging interface uses current-limiting without battery protection. Only use lithium batteries with protection circuits from reputable manufacturers.
- Warning 2: Default power supply is 5V. To use a 3.7V lithium battery, you must replace the onboard diode with a 0-ohm resistor or short the pad. Custom batches for 3.7V power supply are available.
- MUTE Port: Outputs 3.3V when muted, 0V during playback. Compatible with amplifier mute circuits depending on polarity.
- Signal Interference: Avoid placing the module near metal or high-frequency wireless transmitters to prevent Bluetooth signal issues.
- Noise or Static: Use thick ground wires and avoid using plug-in wires. Connect grounds between Bluetooth module and amplifier board carefully. For best results, power both boards separately.
Features:
- Bluetooth Version: V4.2
- Lossless decoding: WAV/WMA/FLAC/APE/MP3
- Stereo dual-channel output
- Bluetooth range: up to 20 meters (open area)
- Compact design, suitable for DIY audio projects
Blue Indicator Light:
- Fast blinking: No Bluetooth connection
- Always on: Bluetooth connected
- Slow blinking: Music playback in progress
Pinout of the Module:
| Pin Number | Pin Header | Description |
|---|---|---|
| 1 | 5V | Power-positive 5V |
| 2 | GND | Negative power-supply |
| 3 | VBAT | Lithium battery positive 3.7–4.2V |
| 4 | L | Left channel output |
| 5 | R | Right channel output |
| 6 | AGND | Audio ground |
Powering the Module:
You can power the module via a MICRO USB cable (5V) or use either a 5V regulated power supply or a 3.7V lithium battery.
- 5V input: Connect to 5V and GND pins
- 3.7V lithium battery: Connect to VBAT and GND
Audio Output:
Connect the audio output to a 3.5mm headphone jack or directly wire to a power amplifier input via L, R, and AGND pins.
Precautions & Warnings:
- Warning 1: Charging interface uses current-limiting without battery protection. Only use lithium batteries with protection circuits from reputable manufacturers.
- Warning 2: Default power supply is 5V. To use a 3.7V lithium battery, you must replace the onboard diode with a 0-ohm resistor or short the pad. Custom batches for 3.7V power supply are available.
- MUTE Port: Outputs 3.3V when muted, 0V during playback. Compatible with amplifier mute circuits depending on polarity.
- Signal Interference: Avoid placing the module near metal or high-frequency wireless transmitters to prevent Bluetooth signal issues.
- Noise or Static: Use thick ground wires and avoid using plug-in wires. Connect grounds between Bluetooth module and amplifier board carefully. For best results, power both boards separately.