MH-MX8 Wireless Bluetooth Audio Module 4.2 Stereo Lossless High Fidelity HIFI DIY Modification M18 M28 M38 MICRO TYPE-CItem NO.: MH-MX8

Wireless Bluetooth 4.2 Audio Module

MH-M18/M28/M38

Product Introduction:

This product MH-M18/M28/M38 is a low-power Bluetooth design scheme. It supports the latest Bluetooth 4.2 transmission, and dual channel stereo playback is lossless. 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.

For Different Needs Of Customers, We Provide 3 Versions For You To Choose From:

Function Description:

● Bluetooth V4.2 version supports Bluetooth automatic loopback technology, WAV/WMA/FLAC/APE/MP3 lossless decoding, and stereo dual channel output.

● After the module is powered on, the mobile phone searches the Bluetooth name MH-M18/MH-M28/MH-M38, and music can be played after connecting to Bluetooth;

Module Blue Indicator:

● When Bluetooth is not connected, the indicator light flashes quickly;

● The indicator light is always on when Bluetooth is connected;

● The indicator light flashes slowly when Bluetooth is playing.

Each Version Is Described As Follows:

MH-M18：

The module interface adopts the half hole process, and the customer can directly patch or weld on the board.

Pin Description:

1. KEY: key control terminal (4 key functions, additional resistance is required)

2. MUTE: Mute control terminal (output high level 3.3V during mute and low level during playback)

3. VCC: power supply positive pole 5V (lithium battery 3.7V power supply requires short circuit diode)

4. GND: power cathode

5. L: Left channel output

6. R: Right channel output

● MUTE mute control terminal: used to control the power amplifier board. MUTE outputs high level 3.3V during MUTE and low level during playback.

● KEY key control: this function can only be realized by connecting resistance and key additionally. (The corresponding resistance is shown in the wiring diagram)

● Volume power-off holding function: 100% volume is output by default. Press the key to control the volume increase and decrease. If the control volume is less than 15%, the volume output will be 15% after power on again; If the control volume is greater than 15%, the original volume will remain unchanged after power on again.

MH-M28：

Pin Description:

1.5V: positive pole of power supply 5V

2. GND: power cathode

3. VBAT: lithium battery cathode 3.7-4.2V

4. L: Left channel output

5. R: Right channel output

6. AGND: audio ground

● Power supply: You can directly use the MICRO USB Android cable 5V for power supply, or you can connect another 5V power supply or 3.7V lithium battery (as shown in the figure below). 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.

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

MH-M38：

Pin Description:

1.5V: positive pole of power supply 5V

2. GND: power cathode

3. VBAT: lithium battery cathode 3.7-4.2V

4. L+/L -: left audio channel output (directly connected to the horn)

5. R+/R -: right audio channel output (directly connected to the horn)

● Power supply: You can directly use the MICRO USB Android cable 5V for power supply, or you can connect another 5V power supply or 3.7V lithium battery (as shown in the figure below). Note that the power supply interfaces of 5V and 3.7V are different. 5V is connected to 5V and GND, and 3.7V lithium battery is connected to VBAT and GND.

● The maximum working current is 5V2A. It is recommended to use 5V2A regulated power supply for power supply with better sound quality.

● Support USB sound card, drive free (plug and play). Connect the module to the computer with USB data cable, and the computer can play music through the amplifier output of the module

● Audio output: output stereo audio signals of left and right channels, which can be connected to two 2-8 ohm and 3-5W speakers respectively, and 4-ohm 5W speakers are used for push storage.

● This product has its own dual 5W power amplifier circuit, so it must not be connected to another power amplifier for use! The outputs of the two power amplifiers cannot be connected in parallel or the negative poles can be connected together, otherwise the power amplifier chip will be damaged.