Dual PCM1794 Bluetooth "Portable" DAC

It's rare to see anyone making audio-related gadgets on open-source platforms, let alone using the PCM1794, so I made one myself.
I've actually been enjoying making audio-related gadgets on and off for the past three or four years. Initially, I made Bluetooth speakers using readily available solutions, but later I wanted to research from the ground up, creating a "research and development factory" rather than an "assembly factory." This PCM1794DAC is the culmination of my years of work, and I'm quite satisfied with it. I won't be making these kinds of things again unless absolutely necessary (it's too expensive). Enough
rambling, let's get to the introduction.
 
Overall, it's a decoder + DAC + headphone amplifier integrated unit, using a dual PCM1794 combination, with each chip responsible for a separate channel.
There are two audio input modes: Amanero digital interface and QCC5181 Bluetooth module. Bluetooth input and digital interface input are switched via an onboard switch.
It has a built-in 16.8V 10000mAh rechargeable lithium battery (4*12065), providing approximately 7-9 hours of use on battery power alone. Onboard power switch.
Onboard headphone protection module with a 2-second power-on delay and early power-off disconnection effectively prevents noises such as "pop" sounds that can affect hearing and speaker lifespan.
Onboard multi-stage voltage generator + regulator generates multiple voltages (+-12V, +5V, and +3.3V) and several power rails from the battery input to power different components.
Onboard LME49600TS headphone buffer, capable of driving a 600Ω load with 200mA current.
Supports up to 24bit 192kHz digital audio; when connected via Bluetooth, it supports up to 24bit 96kHz LDAC or aptX audio. Supports balanced output (onboard socket), defaults to single-ended output.
Features an acrylic cover and aluminum alloy base plate; CAD files are attached and readily available. The base plate and cover plate use the same file.
 
Here are some photos:
 
 
 
I've put the detailed production process and explanations on Bilibili, link: https://www.bilibili.com/video/BV1rv42117tH/
I will be migrating these projects to GitHub, my GitHub homepage: Your Repositories (github.com)
My videos are also on YouTube, my YouTube homepage: (1165) UOSTime - YouTube
If you have any questions, I suggest asking on Bilibili, and the same goes for communication and discussion. I don't check here often.