These copper layers are defined in the design environment as part of the layer stack, along with the insulation material that separates them. Two to ten copper layers are common, but it is possible to fabricate a board with over thirty copper layers.

Note how the circuit tracks that are on the bottom layer are visible through the board.įast forward to today, where almost all PCB designs have multiple copper layers. Wiring was formed in the copper layer(s) as conductive traces, by etching away (removing) unwanted copper.Ī simple, single-sided PCB. In the early days of printed circuit board (PCB) manufacturing, the board was simply an insulating core layer, clad with a thin layer of copper on one or both sides. The PCB is designed and formed as a stack of layers. A printed circuit board, or PCB, is used to mechanically support and electrically connect electronic components. An Austrian scientist, Dr Paul Eisler, is credited with making the first operational printed wiring board in 1943, where the printed circuits replaced the bulky wiring in a vacuum tube radio.

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