MP3 Dekóder kártya Vezeték nélküli Bluetooth 4.2 Audio Modul Verlustfreie Sztereó DIY Refit Lautsprecher Hohe Fidelity HIFI M38
MP3 Decoder Board Wireless Bluetooth 4.2 Audio Modul Verlustfreie Stereo DIY Refit Lautsprecher Hohe Fidelity HIFI M38
Product introduction:
This product is a low-power Bluetooth design scheme, 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 realized, which is very convenient. In an open environment, the Bluetooth connection distance can reach up to 20 meters.
It is widely used in various Bluetooth audio receivers, various audio DIY modification, etc.

Function Description:
Bluetooth V4.2 version, support Bluetooth automatic connection technology, support WAV/WMA/FLAC/APE/MP3 lossless decoding, stereo dual-channel output.
After the module is powered on, the mobile phone searches for the Bluetooth name HW-406, and it can play music after connecting to the Bluetooth;
Module blue indicator light:
When Bluetooth is not connected, the indicator light flashes quickly;
When the Bluetooth is connected, the indicator light is always on;
When Bluetooth is playing, the indicator light flashes slowly.

MH-M38:
1. 5V: power supply positive 5V
2. GND: negative pole of power supply
3. VBAT: Lithium battery anode 3.7-4.2V
4. L /L-: Left channel output (directly connected to the speaker)
5. R /R-: Right channel output (directly connected to the speaker)
1. Power supply: You can directly use the MICRO USB Android cable 5V for power supply, or you can also connect to a 5V power supply or a 3.7V lithium battery. Note that the power supply interface of 5V and 3.7V is 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 a 5V2A regulated power supply for better sound quality.
2. Support USB sound card, free drive (plug and play). Connect the module to the computer with a USB data cable, and the computer can play music and output through the module's amplifier
3. 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.

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.

Precautions
Signal interference: Bluetooth antennas are extremely susceptible to interference from high-frequency or strong electromagnetic signals, so please place them as far away as possible from wireless devices. And the board can not be close to metal objects, keep a certain distance.

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 Bluetooth module, but must be soldered, especially the ground wire, and the wire should not be too long, the shorter the better, and try Thicker. If the audio ground is at the grounding point of the power amplifier board, it needs to be connected to the ground of the audio input end of the power amplifier. This grounding point can be welded in different positions to achieve the lowest current sound. It is recommended that the Bluetooth and the power amplifier board be powered separately, and the Bluetooth 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 will easily cause static electricity to kill the chip and cause burnout.
1005003161401948. - pingto