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Multilayer PCBs

In order to increase the area of tracks wiring, the multilayer board uses more single or double wiring boards.

With using a double-sided boards as inner layer, two single-sided as outer layer or two double-sided as inner layer, two single-sided boards for the outer layer, through the position system and insulation bonding 

Multi-Layer Board

materials alternately together, it is 4layer or 6layer PCB. 

The number of boards does not represent several layers of independent wiring. In exceptional cases, the empty layer is added to control the boards thickness. Usually the layers are even numbers, include the outer layer

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