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PCB is the acronym to Printed Circuit Board. A PCB is a carrier for the circuit's components and their electrical connections.

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What are these arrows on a schematic?

I am trying to understand a schematic by Espressif for the ESP32 devkit v4. There are 7 arrows on U1 (CP2102N-A01-GQFN28) and 1 on U3 (ESP32_WROVER(NC)). Why U1 have a green rectangle? Link to the ful …
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