Logic circuits operate on electronically-represented facts but a logic circuit on its own cannot operate on any facts unless it has been told what they are. Owen Bishop, in Understand Electronics (Second Edition), 2001 Logic circuits and the outside world Contactless proximity limit switch replaces the conventional limit switch that is operated by physical contact. The chapter also discusses the various actions of transistors in detail. It is possible to change the electrical characteristics of these materials by adding closely controlled amounts of certain impurities. Transistors are made of materials known as semi-conductors, such as germanium or silicon. The basic component of logic elements is the transistor. If the inverters (NOT) are combined with the basic AND and OR units, then the symbols are produced that are equivalent. There are two ways of representing the same logic function. The more important logic circuits are “AND― units, “OR― units, “NOT― units, “NOT AND― units, “NOT OR― units, “MEMORY― units, and “TIME DELAY― units. Static control principles and logic function terminology represent a radical change from conventional relay circuitry. GRAY B.SC, M.I.E.E., M.I.MAR.E., M.A.I.E.E.E., in Centralized and Automatic Controls in Ships, 1966 Publisher Summary
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