Desktop sound card, headphone amplifier, power amplifier, three-in-one V1.0

⭐ There is a big mistake in this project. You cannot use it at your own risk (I have burned several 3116 pieces)

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⭐This V1.0 project is modified based on the big brother’s V2.0.

1) To increase the function of the sound card, the MCU with stronger performance was replaced: STM32F411CEU6, and the DAC of ES9018K2M was used;

2) Enhance the power supply of the op amp and use +/- 12V power supply;

3) Replace with a better headphone amplifier: TPA6120;

4) Add Bluetooth audio function, but only have M18 Bluetooth module in hand;

5) Add low-frequency independent channels;

6) Modify the front-end circuit from unbalanced to balanced, and use the OPA1678 on hand as the op amp.

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⭐A new version will be updated later, this version is garbage, please do not imitate————V1.0

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⭐2022/03/17 Test the LDO and see if the PCB needs to be changed. 

⭐2022/03/22 Remove the -12V power supply, the sound may be worse, take a look. ——————V1.1

⭐2022 / 04 / 12 I am busy with a project. I will put it aside for the time being and continue working on it after I finish .

⭐2022/04 /23 The V1.1 version is posted and a pair of headphones is scrapped. . . . . Too much power? ? ? ?