MH-M18 Bluetooth Audio Receiver Module

 MH-MX8 Wireless Audio Module 4.2 Stereo Lossless High Fidelity HIFI DIY Modification DESCRIPTION :
                                                                      Product Introduction:
This product, MH-M18/M28/M38, is a low-power Bluetooth design solution that supports new Bluetooth 4.2
transmission and dual channel stereo lossless playback. After the module is connected to Bluetooth, it can quickly achieve Bluetooth wireless transmission. In an open environment, the Bluetooth connection distance can reach up to 20 meters. Widely used in various Bluetooth audio reception, various audio DIY modifications, etc.

                                                                         Function Description: 
Bluetooth V4.2 version, supports Bluetooth automatic reconnection technology, supports WAV/WMA/FLAC/APE/MP3
lossless decoding, and stereo dual channel output. After the module is powered on, the phone searches for the Bluetooth name MH-M18/MH-M28/MH-M38, and after connecting to Bluetooth, music can be played; Module blue indicator light: When Bluetooth is not connected, the indicator light flashes quickly; When connected via Bluetooth, the indicator light remains on; When Bluetooth is playing, the indicator light flashes slowly.

Signal interference: Bluetooth antennas are susceptible to high-frequency or strong electromagnetic signal interference and should be placed away from transmitting wireless devices. And the board cannot be placed close to metal objects, maintain a certain distance.

If there is current noise from the power amplifier board, the cause is interference from the ground wire. It is recommended that the output end of the Bluetooth module should not be plugged in, but soldered, especially if the ground wire needs to be soldered, and the wire should not be too long, the shorter the better, and try to be thicker. The issue with the audio ground at the amplifier board grounding point should be connected to the ground at the audio input end of the amplifier. This grounding point can be soldered at different positions to achieve low current sound. It is recommended to separate the power supply for Bluetooth and amplifier board, and isolate the Bluetooth ground and amplifier ground.

Due to the bare board design of this product, try not to touch the components on the board with your hands, as it may cause static electricity to kill the chip and cause it to burn out.

Warning: The charging interface of this product is in current limited charging mode and does not come with charging management! For the safety of your life and property, please make sure to use lithium batteries with protective plates produced by legitimate manufacturers. If any losses are caused due to improper use, our company will not be held responsible!

Additionally, when using MH-M18, the following two points should be noted: 

Power supply: defaults to 5V power supply. If you need to use a 3.7V lithium battery for power supply, you need to replace the diode (as shown in the figure) with a 0 ohm resistor of 0603, or simply short circuit both ends of the solder pad. 

The Bluetooth audio module requires a very high power supply, which can affect the quality of the audio. It is recommended to add an LC filtering circuit, especially for switching power supply (such as mobile phone chargers).

What's Included🔹
1 × MH-M18 Bluetooth Audio Receiver Module

Pro Tip🔹
Mount the module near the edge of your enclosure to maximise Bluetooth range and minimise signal interference from metal panels.💡

Note:⚠️
Bluetooth range may be reduced inside fully enclosed metal speaker cabinets. Use an external antenna header if available.