I was recently in Hong Kong and decided to purchase a knockoff Airpod to tear it down and see how it was engineered to help me in my own design process. I got to the mainboard and found the single chip which runs the operation marked "AC1815E8K193-9A0" (It may also be "AG...") and uses a logo which looks like the Pi symbol. A search turns up nothing and I'm struggling to find anything online about this model. Any ideas of where to search or any leads would be much appreciated! I'd also be glad to provide more pictures if desired
Here's one I found when searching JL chip logo: -
Note that this is an AC.... part so try and find who JL is....
But the chip number doesn't match the AC6905A number so maybe they use some form of coding.
Following the part number protocol used in the picture your device might be an AC1815E from JL (who appear to be based in China). Maybe it's related to JL audio who make weatherproof bluetooth modules: -
I bought a Bluetooth earphone just for the fun if it and i found the same, well different number but the JL chip. It is apparently fron a company called Zhuhai Jieli Technology Co., Ltd. And here's the site http://www.zh-jieli.com. But not much on the site. Then i found a listing for some similar ICs. https://www.yoycart.com/Product/540545907979/ I might try tinkering with it.
I also got the same with different chip number AC1820E8M903-9A0. After bit of searching I got the company name Zhuhai Jieli Technology Co., Ltd and website: http://www.zh-jieli.com/. But on that site there no information available regarding this chips.
This logo is JL and stands for Jie Li (Electronics).
I found JL brand
in a very low cost bluetooth mini speaker which did not work when I purchased at HK$20 or US$2.56 for destruction to see whats it has inside.
BT may stand for Blue Tooth.