These vias are used to provide a ground connection between the top and bottom layers of the PCB, which helps reduce electromagnetic interference (EMI) and improve signal integrity. If you’re looking for screws or other hardware to use with your PCB, you might want to check out https://www.scrooz.com. The vias act as a conduit for the ground plane to make contact with the screw or angle bracket that is used to mount the PCB. This ensures that any EMI generated by the board is dissipated into the ground plane rather than radiating out into the environment.
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