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CLIPBOARDS: 3RC clipboards are made from limited-production PCBs that were manufactured in various sizes, from one inch up to about 24x40 inches, depending on their ultimate application. PCBs are made from ‘innerlayers’ – paper-thin, but
very strong and flexible sheets of fiberglass-epoxy upon which are created intricate circuits made of copper. These innerlayers are stacked and heated under pressure to produce a 3-dimensional composite. The layers are connected by “through-holes”, some thinner than a human hair. Electrical conductivity between the layers is accomplished by immersing the entire board in liquid solder inside a vacuum chamber. The solder coats the insides of the holes and allows electrons to flow between the layers. A PCB is therefore a complex 3-dimensional circuit. Modern PCBs can have as many as 30 layers. Electronic components such as resistors, transistors, capacitors, etc. are attached by soldering them to the surface of a board to produce a finished product, such as the motherboard of a computer.
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