Mantech MH-M38 - User Manual

Wireless Bluetooth audio module 4.2 stereo
lossless high fidelity HIFI DIY modification
Product introduction:
This product MH-M18 / M28 / M38 is a low-power Bluetooth design solution that supports the latest Bluetooth
4.2 transmission, two-channel stereo lossless playback. After the module is connected to Bluetooth, Bluetooth
wireless transmission can be quickly achieved, 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.
According to the different needs of customers, we provide 3 versions for you to choose:
Function Description:
1. Bluetooth V4.2 version, support Bluetooth automatic reconnection technology, support WAV / WMA / FLAC /
APE / MP3 lossless decoding, stereo two-channel output.
2. After the module is powered on, the mobile phone searches for the Bluetooth name MH-M18 / MH-M28 / MH-
M38, and can play music after connecting to Bluetooth
3. Module blue indicator:
When Bluetooth is not connected, the indicator flashes quickly;
When the Bluetooth is connected, the indicator light is always on;
When Bluetooth is playing, the indicator flashes slowly.
The following is the introduction of each version:

Summary

Wireless Bluetooth Audio Module Overview

Product Introduction and Features

Details the low-power Bluetooth 4.2 design, stereo lossless playback, connection range, and supported formats.

Module Functionality and Indicators

Explains Bluetooth V4.2 features, auto-reconnection, lossless decoding, and the blue indicator light status.

MH-M18 Module Specifications

MH-M18 Pinout and Interface

Lists the PIN assignments (KEY, MUTE, VCC, GND, L, R) and their functions for the MH-M18 module.

MH-M18 Mute and Key Control Functions

Details the MUTE control terminal and the KEY button control for volume adjustment and power-off retention.

M28 Module Specifications

M28 Pinout and Power Supply Options

Details PIN assignments (5V, GND, VBAT, L, R, AGND) and power supply methods for the M28 module.

M28 Audio Output Connections

Explains how to connect audio output from the M28 module to earphones or amplifier boards.

M38 Module Specifications and Safety

M38 Pin Configuration and Features

Lists M38 PIN assignments, USB sound card support, and audio output capabilities for speakers.

M38 Amplifier, Precautions, and Warnings

Covers the M38's built-in amplifier, signal interference, ground wire issues, static electricity, and battery safety.

Mantech MH-M38 Specifications

General

Brand	Mantech
Model	MH-M38
Category	Control Unit
Language	English