Audio module M28 Bluetooth 4.2

Изображение товара

Product description format_size zoom_out zoom_in

The module is a Bluetooth low energy audio receiver that supports Bluetooth 4.2, lossless dual-channel stereo playback. The transmission distance is up to 20m. Can be used in a variety of homemade DIY devices or to increase the capability of legacy audio systems. You can connect the battery and charge it via microUSB connector.

Main features:

• Supply voltage: 5V/4.2-3.7V DC
• Standby consumption: 5.5 mA
• Transmission consumption: 20 mA
• Sleep consumption: 3 uA
• Bluetooth version: V4.2
• Support protocols: HFPV1.7, A2DPV1.2, AVRCPV1.5, AVCTPV1.2, AVDTPV1.2
• Format support: WAV/WMA/FLAC/APE/MP3
• up to 20 m
• Operating temperature: -40..+85 °C
• Receiver sensitivity: -87 dbm
• Powered by Li-ion battery
• Charging Li-ion battery
• There is a headphone jack
   

Pinout:

• 5V - plus module power 5V
• GND - common terminal, power negative
• VBAT - battery power positive
• L - left audio channel output
• R - right audio channel output
• AGND - audio output common

Schematic connections:

Precautions and operating conditions:

Signal interference. Bluetooth antennas are easily affected by high frequency or strong electromagnetic signals and should be kept away from wireless and other devices. The module should not be near metal objects, keep a certain distance.

If you hear extraneous sound when connecting to the power amplifier board, the cause is caused by interference in the ground wire. It is recommended not to use a plug wire at the output of the Bluetooth module, but to solder the wire, especially the ground wire, and the wire should not be too long, the shorter the better, preferably thicker. An audio ground problem at the ground point of the power amplifier board may be related to the grounding of the audio input of the power amplifier. This ground point can be soldered in different positions for low noise audio. It is recommended to separate the power supply for the Bluetooth and the power amplifier board, and isolate the Bluetooth ground and the power amplifier ground.

Since this product is a bare board design, please avoid touching the components on the board with your hands, as static electricity may pierce the chip and cause it to catch fire.

Warning: The charging interface of this product is a current limit charging mode without charge control! For the safety of your life and property, be sure to use lithium batteries with protection boards. The company is not responsible for any damages caused by misuse!