Feature:
1. MH‑M38 is a low‑power BT design solution, supports the latest BT 4.2 transmission, two‑channel stereo lossless playback.
2. After the module is connected to BT, it can quickly realize BT wireless transmission, which is very convenient.
3. Long connection distance, BT connection distance up to 20 meters in an open environment.
4. Support USB sound card, plug and play, connect the module to the computer with a USB cable, and the music can be output through the module's amplifier.
5. Can be directly powered by the MICRO USB cable 5V, or it can be connected to a 5V power supply or a 3.7V lithium .

Specification:

Item Type: Digital Amplifier Board
5V: The Positive Pole of the Power Supply is 5V
GND: Negative Pole of Power Supply
VBAT: Lithium Anode 3.7-4.2V
L+ / L-: Left Channel Output (Directly Connected to the Speaker)
R+ / R-: Right Channel Output (Directly Connected to the Speaker)
Audio Output: Output Left and Right Channel Stereo Audio Signals, Which Can Be Connected to Two 2-8 Ohm and 3-5W Speakers Respectively, and 4 Ohm 5W Speakers Are Recommended for Storage.





Package List:
1 x Digital Amplifier Board

2 x Terminal
2 x Wire

:
1. Signal interference: The BT antenna is extremely susceptible to interference from high‑frequency or strong electromagnetic signals. Please place it as far away as possible from devices such as wireless transmitters. And the board can not be close to metal objects, keep a certain distance.
2. If there is current noise on the power amplifier board, the cause is caused by ground wire interference. It is recommended that you do not use plug‑in wires at the output of the BT module, but must be soldered, especially the ground wire, and the wire should not be too long, the shorter the better , Try to be thicker. The audio ground must be connected to the ground of the audio input terminal of the power amplifier. This ground point can be welded in different positions to achieve the lowest current sound. It is recommended that the BT and the power amplifier board be powered separately, and the BT ground and the power amplifier ground are isolated.
Since this product is a bare board design, try not to touch the components on the board with your hands, which may cause static electricity to kill the chip and cause burnout.
3. Warning: The charging interface of this product is a current‑limiting charging mode, without charging management! For the safety of your life and property, please be sure to use a lithium with a protective plate produced by a regular manufacturer. If the loss is caused by improper use, we will not bear any responsibility!

4. This Product Has Built‑In Dual 5W Power Amplifier Circuit, and You Must Not Use It with Another Power Amplifier! the Outputs of the Two Power Amplifiers Cannot Be Connected in Parallel or the Negative Poles Connected Together, Otherwise the Power Amplifier Chip Will Be Damaged.

5. That the Power Supply Interface of 5v and 3.7v is Different, 5v is Connected to 5v and GND, and 3.7v Lithium is Connected to VBAT and GND.The Maximum Working C