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answers:
lee26loo，異地強秦後人 say: [1] Make 2 double printed circuit boards.
[2] Insert insulation sheet between, spray glue and compress into one circuit board.
[3] Drill holes on finished board.
[4] Insert hollow rivet into holes as needed from circuit design and weld to trace.
[5] Go and no go resistance test.
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Philomel say: A four layer PC board is made by making two 2 layer boards and bonding an innerboard between them then holes are drilled through and the holes are thru plated. It is an involved process. You are not going to do it in your kitchen or workshop or garage. The library has books on Multi Layer PC Board processing.
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derfram say: Make 2 two sided boards, and then bond together with a layer of dielectric between them. Drill all required holes and plate-through.
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Leicester City say: Brung a paper and pencil and vapour it all around
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