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Two printed circuit boards, c 1970s.

Two printed circuit boards, c 1970s.
4 0 c m
actual image size: 32cm x 32cm


Printed circuit boards such as these are composed of an electronic circuit based on thin strips of a conductor on an insulating board. The foil is etched away to leave tracks that connect the components together. A layer of lacquer protects the board except where components are inserted. This allows the components to be fixed in place by skimming the entire board acros a bath of molten solder.

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© Science Museum / Science & Society Picture Library

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