I happen to have two small speakers unused at home, and I plan to convert them into speakers with lossless Bluetooth transmission function.
The Bluetooth module uses QCC3031 to achieve ATPX-HD lossless Bluetooth transmission, and PCM1794A to implement I2S decoding.
Dual NE5532 balanced outputs to TPA3116D for amplification
Use LP5907 and 1117 to power PCM1794A and Bluetooth modules respectively
The positive and negative power supplies use two TPS5430s to provide stable positive and negative 12V power supplies for the NE5532.
This project is public for the first time. The circuit design refers to the official manual and online information.
The TPA3116 power amplifier part is referenced from: https://oshwhub.com/winton/d-lei-shuo-zi-gong-fang
The positive and negative power supply parts of TPS4530 are referenced from: https://oshwhub.com/hshgc/tps5430-dan-dian-yuan-zhuan-zheng-fu-shuang-dian-yuan
GPL 3.0
7/28: Each power supply part has been successfully verified.
3.3V power supply, 5V power supply indicators are normal
There is a problem with the 12V positive and negative power supply circuit, which can be solved by flying wires
Fixed on V1.4
The problem with the positive and negative power supply circuits:
V1.3 version negative 12V power supply part
V1.4 version negative 12V power supply part
After scraping off the copper foil and flying the wires, it returned to normal
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7/31: After welding the remaining components and the Bluetooth module, the power-on test was successful.
The button control is normal, and an aluminum heat sink with adhesive backing is used to enhance heat dissipation.
The sound is very powerful when driving two 8 ohm 15W full-range speakers.
Of course, it is also possible to drive the speakers directly, and the listening experience is very good.
more pictures:
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No software part
The Lichuang number of the 680nf capacitor in the BOM is wrong and needs attention.
Test video address with speakers 1: https://www.bilibili.com/video/BV1Tb4y1z7Fs
Test video address 2 with speakers: https://www.bilibili.com/video/BV1GX4y1F793
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