SPECIFICATIONS

1,This product MH-M18/M28/M38 for low-power Bluetooth design solutions, support the latest Bluetooth 4.2 transmission, dual-channel stereo lossless playback, the module is connected to the Bluetooth, it can quickly achieve Bluetooth wireless transmission, very convenient. In the open environment, the Bluetooth connection distance can reach 20 meters.

2,Widely used in a variety of Bluetooth audio reception, a variety of audio DIY modifications, etc.

3,MUTE mute control terminal: used to control the amplifier board, MUTE output high level 3.3V when mute, output low level when play.

4,KEY button control: This function requires additional connection of resistors and buttons to achieve. (The corresponding resistor is shown in the wiring diagram)

5,Volume power-off hold function: The default output is 100% volume. Control the volume increase or decrease by key, if the control volume is less than 15%, the volume output will be 15% after re-powering; if the control volume is greater than 15%, the original volume will remain unchanged after re-powering.

6. Power supply: You can directly use the MICRO USB Android cable 5V for direct power supply use, you can also access another 5V power supply or 3.7V lithium battery (as shown in the figure below). Note that the 5V and 3.7V power supply interface is not the same, 5V voltage connected to 5V and GND, 3.7V lithium battery connected to VBAT and GND.

7. Audio output: headphones can be directly connected to the 3.5mm audio interface, and can also be wired for the audio input of the amplifier board