PT7029 MH-MX8 M18/M28/M38 Wireless Bluetooth MP3 Audio Receiver board BLT 4.2 Mp3 lossless decoder
- Product Code : PT7029
- Availability : In Stock
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$1.10
M18
1. Product introduction
MH-M18 is a low-power Bluetooth design solution that supports the latest Bluetooth 4.2 transmission, two-channel stereo lossless playback, and supports button control (songs, songs, pauses, volume increase and decrease, power on/off, etc.). After the module is connected to Bluetooth, Bluetooth wireless transmission can be quickly realized, which is very convenient. The module interface is a half-hole process that allows the customer to attach directly or solder to the board. In an open environment, the Bluetooth connection distance can be up to 20 meters.
2. Size
PCB size: 23*16*2.5mm (length, width and height)
3. Function /Pin definition
1 . The interface adopts a semi-hole process, which is convenient for customers to directly attach or solder to the board.
2.1. Bluetooth V4.2 version, support Bluetooth automatic connection technology, support WAV/WMA/FLAC/APE/MP3 lossless decoding, stereo dual channel output.
PIN NO | Function | Description |
1 |
KEY | Button control terminal (4 button functions, additional resistors such as wiring diagram) |
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 | GND |
5 | L | Left channel |
6 | R | Right channel |
3. After the module is powered on, the mobile phone searches for the Bluetooth name MH-M18, and can play music after connecting Bluetooth.
3.4, module blue indicator light:
4.When the Bluetooth is not connected, the indicator light flashes quickly; 5.When the Bluetooth connection is on, the indicator light is always on;
6.The indicator light flashes slowly while Bluetooth is playing.
7 . 5, MUTE mute control terminal: used to control the power amplifier board, MUTE output high level 3.3V when muting, output low level during playback.
8 . 6, KEY button control: This function needs to be connected to the resistor and button to achieve. (corresponding to the resistance as shown in the wiring diagram)
9 . 7, the volume power off function: the default output 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.
4. Application wiring diagram
5. Atention
Power supply: The default is 5V. If you need to use a 3.7V lithium battery, you need to replace the diode (as shown) with a 0-ohm resistor of 0603, or directly short the two ends of the pad. The shipment defaults to 5V power supply. If the customer needs 3.7V lithium battery power supply, it can be customized in batches.
the audio. It is recommended to add an LC filter circuit, especially a switching power supply (such as a mobile phone charger).
1 . 1. Current sound: The cause is ground wire interference. It is recommended that the output of the Bluetooth module should not be plugged in. It is necessary to weld the wire, especially the ground wire, and the wire should not be too long. The shorter the better, the thicker. The problem of audio grounding at the grounding point of the power amplifier board must be connected to the ground of the audio input of the power amplifier. This grounding point can be tried to solder at different positions to achieve the lowest current sound. It is recommended that the Bluetooth and the power amplifier board be powered separately to isolate the Bluetooth ground and the amplifier ground.
2.
3.2, signal interference: Bluetooth antenna is extremely vulnerable to high frequency or strong electromagnetic signal interference, try to place away from the place where the wireless device is sent. And the board can't be close to metal objects, keeping a certain distance.
4.
5 . 3. MUTE mute port: When the module is muted, the port outputs a high level of 3.3V, and outputs a low level of 0V during playback. If the power amplifier board mute high level is valid, it can be directly connected. If the power amplifier board mute is low level control, you need to add the reverse circuit, as shown below:
6, because this product is bare board design, try not to touch the components on the board by hand, it is easy to cause static electricity to kill the chip and cause burning.
M28
1. Product introduction
MH-M28 is a low-power Bluetooth design that supports the latest Bluetooth 4.2 transmission and two-channel stereo lossless playback. Small size, convenient and practical, Bluetooth connection can be quickly realized after the module is connected to Bluetooth, which is very convenient. In an open environment, the Bluetooth connection distance can be up to 20 meters. Can be used for Bluetooth audio reception, various audio DIY modification and so on.
2. Size
PCB size: 45*20*6.8mm (length, width and height)
Pin pitch: 2.54mm (positioning hole is 3mm in diameter)
