QCC3034 High-Definition Bluetooth Speaker. Based on the Qualcomm QCC3034 high-definition Bluetooth module, this Bluetooth speaker solution offers clear music playback and USB audio functionality through Bluetooth connection.

This project is a Bluetooth speaker solution based on the Qualcomm QCC3034 Bluetooth module, which provides clear music playback and USB audio functionality through Bluetooth connection.

This project establishes a connection between the QCC3034 Bluetooth module and a mobile phone to stream media music. The received audio data is then sent through I2S to the audio digital-to-analog converter and D-class amplifier on the motherboard, driving headphones and speakers to produce sound, thereby achieving the function of playing media audio. The main functional modules of this project include four parts: the Bluetooth part, analog output part, amplifier part, and power supply part. The following is a detailed explanation of each functional module.

Schematic QCC3034 High-Definition Bluetooth Speaker

Bluetooth Part

The Bluetooth function is implemented by the QCC3034 Bluetooth audio module. In addition to supporting standard SBC and AAC audio transmission technologies, it also supports aptX and aptX HD high-definition audio transmission technologies, providing users with a more realistic music experience. The module only needs to be paired with a small number of passive components, making it easy to use. This module also supports USB audio function, enabling audio streaming playback through USB connection.

Analog Output Part

 Amplifier Section

The amplifier section consists of two MAX98357A chips, each responsible for amplifying the audio signals of the left and right channels. The MAX98357A is a PCM (pulse code modulation) input Class D power amplifier that provides AB class audio performance while maintaining the efficiency of Class D, all in a small size and low cost. The device can drive a 4Ω load at 3W power under 5V power supply, with multiple programmable gains, filter-free output design, and support for 3-wire SAI, eliminating the need for MCLK and effectively reducing electromagnetic interference issues caused by high frequency clocks.

Power Section

The power section includes charging management, digital analog power supply, and power on/off control. The charging management function is implemented by the IP5306, a multi-functional power management SoC that integrates boost converters, lithium battery charging management, and battery level indication. This device supports 2.1A charging, 2.4A boost output, and power path management, allowing for simultaneous charging and discharging. The digital analog power supply is provided by an LDO, converting the 5V system supply into 3.3V for use by the Bluetooth module and audio DAC. The power on/off control function is implemented by the EC190708, supporting long press 3s button control to turn the system on/off by controlling the external power PMOS to connect or disconnect the system power supply, enabling power on/off control.

Design Key Points

The design key points of this project include the following 4 points: Bluetooth design, analog design, amplifier design, and power supply design.

Bluetooth Design

The Bluetooth antenna on the motherboard adopts an external design, connected to an external antenna with an IPEX connector. The traces from the IPEX connector to the module RF pins on both sides are treated with backflow holes to optimize EMI; the copper layer below the IPEX connector is hollowed out.

 Analog Design

The analog output supports mode switching function. When the headphones are connected to the onboard 3.5mm socket, the amplifier output will automatically be turned off. This function is realized by a micro switch located at the end of the 3.5mm socket. When the headphone plug is fully inserted into the headphone socket, the tip end of the headphone plug will contact the micro switch to close it, controlling the amplifier section to enter standby mode and thus turning off the amplifier output.

Amplifier Design

The gain control of the amplifier section is set by resistor jumpers, allowing for selection of different gains based on the resistance value and installation method of the resistors. See the table below for specific details.

The default gain setting of the baseboard is 12dB. If you want to increase or decrease the gain, please refer to the table above. Special note: In the PCB, each amplifier corresponds to two soldering positions for gain resistors. Please make sure to install the resistor of the correct value to the corresponding soldering position, and it is prohibited to install resistors on both soldering positions at the same time!

Power supply section design.

The bottom plate adopts a 4-layer PCB design, with a complete ground plane.

 Connect to the phone via Bluetooth.

Press the power button on the board to turn it on, and it will automatically enter pairing mode. Open the Bluetooth settings on your phone, and you will see the Bluetooth broadcast name of the board, as shown in the picture below.

Since it has been paired before, when the board is powered on, it will automatically reconnect with the previously paired device.

Connect the board to the computer using a USB data cable, the system will recognize it, and a new audio output device called “QCC3034-USB” will be added to the “Sound Output” options. Select this device and the audio output from the system will be played through the board.

Connect the wired headphones to the 3.5mm analog audio output interface on the board with an audio cable. The audio will play through the headphones, and the amplifier output will automatically turn off.

BOM QCC3034 High-Definition Bluetooth Speaker

Download files, links, and notes

• Download PCB in Gerber + BOM + Centroid file + PDF
• Mirror
• PDF Datasheet 2N7002K – N-Channel 60 V (D-S) MOSFET
• PDF Datasheet SI2323 – P-Channel 20-V (D-S) MOSFET
• PDF Datasheet MAX98357A – Tiny, Low-Cost, PCM Class D Amplifier with Class AB Performance
• PDF Datasheet BTM334 – Bluetooth Module
• PDF Datasheet ES8156 – High Performance Stereo Audio DAC
• PDF Datasheet RT9013-33GB – 500mA, Low Dropout, Low Noise Ultra-Fast Without Bypass Capacitor CMOS LDO Regulator
• PDF Datasheet IP5306 – Fully-Integrated Power Bank System-On-Chip with 2.1A charger, 2.4A discharger
• PDF Datasheet SY6280 – 5.5V, 2A Low Loss Power Distribution Switch
• PDF Datasheet 1N5819 – 1.0a Schottky barrier rectifier
  
• PDF Datasheet EC190707
• BUY BTM334 Module
• BUY IC EC190707 (EC190707-14D8-17FE marked 160AO)
• BUY IC EC190708

Source: https://oshwhub.com/xyzdiy/hifi-lan-ya-yin-xiang