Wireless Bluetooth audio module 4.2 stereo lossless high fidelity HIFI DIY modification

Product Introduction

This product is a low-power Bluetooth design solution that supports Bluetooth 4.2 transmission and lossless dual channel stereo playback. After the module is connected to Bluetooth, it can quickly achieve Bluetooth wireless transmission, which is very convenient. In an open environment, the Bluetooth connection distance can reach up to 20 meters. Widely used in various Bluetooth audio receivers, DIY modification of various audio systems, etc.

Product Parameter

Product Use

The direct output power of the module is very low, and a power amplifier needs to be connected to hear the sound normally. After connecting the wires to the module and powering it on, the module will emit Bluetooth. If a mobile phone is connected to Bluetooth, it needs to be manually connected for the first time. The next time Bluetooth is turned on, it will automatically connect. After Bluetooth is connected, it will convert the received digital audio into analog audio output.

(1) Pin Description

(2) Usage tips

MUTE mute control terminal: used to control the power amplifier board, MUTE outputs a high level 3.3V during mute and a low level during playback. If the mute high level of the amplifier board is effective, it can be directly connected. If the mute of the power amplifier board is controlled at a low level, a reverse circuit needs to be added, as shown in the following figure:

Product Special note

1. Signal interference: Bluetooth antennas are extremely susceptible to high-frequency or strong electromagnetic signal interference, so they should be placed as far away as possible from transmitting wireless devices. And the board should not be in close proximity to metal objects, maintaining a certain distance.

2. If there is a current sound when connecting to the power amplifier board, it is caused by ground wire interference. It is recommended that the output end of the Bluetooth module should not be plugged in, and must be soldered, especially for the ground wire. The wire should not be too long, the shorter the better, and it should be thicker as much as possible. The issue of the audio ground being connected to the grounding point of the amplifier board requires it to be connected to the ground at the audio input end of the amplifier. This grounding point can be welded at different positions to achieve the lowest current sound. Suggest separate power supply for Bluetooth and amplifier board, isolating Bluetooth ground and amplifier ground.

3. 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 burn it out.

Warning: The charging interface of this product is limited to current charging mode and does not come with charging management! For the safety of your life and property, please be 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!

Product Use

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