Also indicates copper on both layers.Īirwires.
These are usually covered over by soldermask. Smaller copper-filled drill holes used to route a signal from top to bottom side. Any part of the green circle is exposed copper on both top and bottom sides of the board. Here are the layers you'll be working with in the board designer: Color We use a palette of colors to represent the different layers. The EAGLE board designer has layers just like an actual PCB, and they overlap too. The layers of a double-sided PCB (image from the PCB Basics tutorial).
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