1, signal layer. Up to 32 signal layers can be provided, including the top, bottom and middle layers. Each layer of PCB prototype can be connected with each other through through holes, blind holes and buried holes.

2, the internal power layer. Usually referred to as the inner layer, only appear in the multilayer board, PCB layer is generally refers to the signal layer and the inner layer of the sum of the sum of the electric.

3, silk screen layer. A piece of high quality PCB board can have up to 2 silk screen layer, respectively, the top layer and the bottom of the screen printing layer.

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