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M38 Bluetooth Audio Module With 5W Power Amplifier Board 4.2 High Fidelity HIFI Audio Amplifier

M38-5W-BLUETOOTH-AUDIO

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Product introduction:

   This product MH-M18/M28/M38 is a low-power Bluetooth design solution, supports the latest Bluetooth 4.2 transmission, two-channel stereo lossless playback, and the module can be connected to Bluetooth to quickly realize Bluetooth wireless transmission, which is very convenient. In an open environment, the Bluetooth connection distance can be up to 20 meters.

Widely used in a variety of Bluetooth audio reception, a variety of audioDIY modification.

For different needs of customers, we offer 3 versions for you to choose from:

Function Description:

  1. Bluetooth V4.2 version, supports Bluetooth automatic connection technology, supports WAV/WMA/FLAC/APE/MP3 lossless decoding, stereo dual 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 Bluetooth.
  3. Module blue indicator light:

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

When the Bluetooth connection is on, the indicator light is always on;

When the Bluetooth is playing, the indicator light flashes slowly.

The following is a description of each version:

MH-M18:

The module interface uses a half-hole process that allows the customer to mount directly or solder onto the board.

Numbering

Pin

Description

1

KEY

Button control terminal (4 button functions, additional resistance required)

2

MUTE

Mute control terminal (output high level 3.3V when muting, output low level during playback)

3

VCC

Positive power supply 5V (lithium battery 3.7V power supply requires short circuit diode)

4

GND

Negative power supply

5

L

Left channel output

6

R

Right channel output

 

MUTE mute control terminal: used to control the power amplifier board. When muting, MUTE outputs a high level of 3.3V, and outputs a low level during playback.

KEY button control: This function requires additional connection of resistors and buttons. (corresponding to the resistance as shown in the wiring diagram)

Volume power off function: The default output is 100% volume. Press the button to control the volume increase and decrease. 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 power-on.

Numbering

Pin

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

1. Power supply: You can directly use the MICRO USB Android cable 5V for direct power supply, or you can also connect 5V power supply or 3.7V lithium battery (as shown below). Note that the 5V and 3.7V power supply interfaces 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 earphone 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 directly wired as shown ).

Numbering

Pin

Description

1

5V

Power positive 5V

2

GND

Negative power supply

3

VBAT

Lithium battery positive 3.7-4.2V

4

L+/L-

Left channel output (direct speaker)

5

R+/R-

Right channel output (direct speaker)

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

The maximum operating current is 5V2A. It is recommended to use a regulated power supply of 5V2A for better sound quality.

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

3. Audio output: output left and right channel stereo audio signals, can be connected to two 2-8 euro, 3-5W speakers, push 4 O 5W speakers.</fon

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