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The Logician and the EngineerHow George Boole and Claude Shannon Created the Information Age$
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Paul J. Nahin

Print publication date: 2017

Print ISBN-13: 9780691176000

Published to Princeton Scholarship Online: May 2018

DOI: 10.23943/princeton/9780691176000.001.0001

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Logic Switching Circuits

Logic Switching Circuits

(p.67) 5 Logic Switching Circuits
The Logician and the Engineer

Paul J. Nahin

Princeton University Press

Today's digital circuitry is built with electronic technology that the telephone engineers of the 1930s and the pioneer computer designers of the 1940s would have thought to be magic. The first real digital technology took the form of electromagnetic relays in telephone switching exchanges. Then came vacuum tube digital circuitry, discrete transistors, integrated transistor circuits, and so on. But the one thing that remains the same is the math, the Boolean algebra that is the central star of this book. This chapter describes the technology that Shannon himself used in his switching analyses. It covers Switches and the logical connectives, a classic switching design problem, electromagnetic relay, the ideal diode and the relay logical AND and OR, and the bi-stable relay latch.

Keywords:   Claude Shannon, Boolean algebra, mathematics, electromagnetic relays, switches, digital circuitry, digital technology

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