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DSD TECH Official Website: DSD TECH SH-M08 CC2541 Bluetooth 4.0 BLE UART Serial Module Compatible with iPhone4S or later (Only Module)
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JL (or maybe something else) misterious branded IC's, what is the origin? - Electrical Engineering Stack Exchange
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JL AC6901 Bluetooth Audio MP3 docoder chip integrated circuit IC LQFP48 Support recording lossless decoding chipset|Circuits| - AliExpress
GitHub - christian-kramer/JieLi-AC690X-Familiarization: Adventures in figuring out how this incredibly ubiquitous, yet incredibly mysterious integrated circuit works.
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![Amazon.com: Blue~Tooth Board, DROK Audio Receiver Blue~Tooth Module DC 5V-24V 12v Portable Wire~Less Electronics Stereo Music Receive Circuit Chip with Micro USB Port for Headphone Speaker Home Sound System DIY: Electronics Amazon.com: Blue~Tooth Board, DROK Audio Receiver Blue~Tooth Module DC 5V-24V 12v Portable Wire~Less Electronics Stereo Music Receive Circuit Chip with Micro USB Port for Headphone Speaker Home Sound System DIY: Electronics](https://m.media-amazon.com/images/S/aplus-media/sc/a051bd06-c033-494f-9664-bbadadf1ad79.__CR0,0,600,180_PT0_SX600_V1___.jpg)