PCB Layers: The Ultimate Guide - mktpcb.com
2 days agou2002·u2002A PCB layer is made up of signal transmitting levels that are vertical to the board's plane. For instance, a 2-layer board has top and bottom layers while a 4-layered PCB has a top, inner 1, inner 2, and bottom layer. There is an insulating substrate in the middle of every PCB layer – the FR4 (Fire Retardant Version4).
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