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Connecting the Dots: The CAD Library
September 25, 2013 |Estimated reading time: 1 minute
Before we look at libraries, it will be helpful to have a basic understanding of how circuit boards are fabricated. Study the 10 steps listed below, which briefly describe the fabrication process.
Start with double-sided cores, thin sheets of insulating material (usually fiberglass) copper-plated on both sides
Print circuit patterns for all inner layers on both sides of the cores using an etch-resist material.
Etch away the copper that isn't protected by the etch-resist, and then strip the resist off.
Laminate with two more single-sided copper layers for top and bottom, and insulating sheets in between.
Drill the holes that will be used to connect the layers of circuitry together (Unplated holes may be drilled later).
Plate the hole walls and surface layers with copper.
Print and etch the patterns for the outer layers (top and bottom) using a similar procedure as the inner layers.
Cover the board with a protective coating called soldermask, except where exposed circuitry is desired.
Plate the exposed circuitry with a final finish to protect and maintain solderability after storage & handling.
Apply silkscreen (epoxy ink) as a reference legend.Read the full column here.Editor's Note: This column originally appeared in the July 2013 issue of The PCB Design Magazine.