ABSTRACT
Printed circuit boards (PCBs) are electronic circuits created by mounting electronic components onto a nonconductive board and creating conductive connections between them. The creation of circuit patterns is accomplished using both additive and subtractive methods. The conductive circuit is generally copper, but other metals are sometimes used. There are three basic varieties of PCBs: single sided, double sided, and multilayered. Printed circuit boards are widely employed in the manufacture of business machines and computers, as well as many other products including communications, control, and home entertainment equipment.
