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Dictionary of Computers - printed circuit board
printed circuit board
Electrical circuit created by laying (printing) ‘tracks’ of a conductor such as copper on one or both sides of an insulating board. The PCB was invented in 1936 by Austrian scientist Paul Eisler, and was first used on a large scale in 1948.
Components such as integrated circuits (chips), resistors, and capacitors can be soldered to the surface of the board (surface-mounted) or, more commonly, attached by inserting their connecting pins or wires into holes drilled in the board. The increased component density and complexity required by the electronics industry demands increasing use of multilayer PCBs which may have three, four, or more intermediate layers of copper conductor. PCBs include motherboards, expansion boards, and adaptors.
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Haiti Flag
Blue represents the black population and links with Africa. Red stands for those of mixed race. The original blue and red flag was based on the French tricolour. Effective date: 25 February 1986.
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