MH-M28 Bluetooth audio receiver

This product MH-M28 is a low-power bluetooth design, supports new bluetooth 4.2 transmission, two-channel stereo lossless playback, after the module is connected to bluetooth, it can quickly realize bluetooth wireless transmission, which is very convenient. In an open environment, the Bluetooth connection distance can reach 20 meters.
Widely used in various Bluetooth audio reception, various audio DIY modification, etc.

Function Description:

Bluetooth V4.2 version, support Bluetooth automatic connection technology, support WAV/WMA/FLAC/APE/MP3 lossless decoding, stereo binaural output.
After the module is powered on, the mobile phone searches for the Bluetooth name MH-M28, and the music can be played after connecting to the Bluetooth;

Module blue indicator:
When the Bluetooth is not connected, the indicator light flashes quickly;
When the bluetooth is connected, the indicator light is always on;
When Bluetooth is playing, the indicator light flashes slowly.


Pin Description:

5V: positive power supply 5V
GND: negative power supply
VBAT: Lithium battery positive 3.7-4.2V
L: Left channel output
R: Right channel output
AGND: audio ground

1. Power supply: You can directly use the MICRO USB Android cable 5V for power supply, or you can additionally connect to a 5V power supply or a 3.7V lithium battery. Note that the power supply interfaces of 5V and 3.7V are different. The 5V voltage is connected to 5V and GND, and the 3.7V lithium battery is connected to VBAT and GND.

2. Audio output: The headset can be directly connected to the 3.5mm audio interface, or it can be wired for the audio input of the power amplifier board (the interface L/R/AGND can be wired directly).