The USB Hub chip uses SL2.1A, and the USB to TTL chip uses CH340C, which is low-priced. The USB differential data lines are all connected in series with 0 ohm resistors, which can be used for impedance matching. Only 0 ohm resistors can also be used. The cover picture is for reference only. The picture is the first version. There are some bugs. Now the project has been repaired and improved!
All functions have been verified and available.
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