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Layers of a PWB (PCB)

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PCB Vias and Holes: Connecting layers

Double sided PCB stock is commonly available and can be etched or milled on each side and the sides connected by vias.

Multi-layer boards can be made by adhearing multiple sheets of very thin single sided stock together. 3M double-sided film # 7935 laminating adhesive works but results in boards that are *more* flexible, not less. Epoxy is better but requres the layers to be clamped together while curing. Alignment can be assured by pre-drilling holes near opposite edges and inserting pins or wires to guide the layers together.

Drill 3 extra vias, sized to fit exactly a push in map pin. Use that to align the masks or the boards (whatever you do). The trick is to have rigid pins, and to size exactly so the boards don't shift. Three pins for alignment (3 corners of a square) assure that you can't reverse a board.

Connections to the inner layers can be accomplished by plating through holes or by drilling a larger hole in the outside layers and then soldering to a pad or smaller hole on the inner layer. Solder paste and flux are helpful.

layer stackup

See layer stack-up text

end http://massmind.org/techref/pwb_layers.htm

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