Ancient Web: Boston University showed how transistors become

A faucet analogy leads from transistor switches to NOT, NAND, NOR, and XOR, with truth tables doing the patient work. The page preserves lecture material adapted from 1995 notes, plus 2006–07 transistor-count examples. Hardware ages; the ladder from switches to Boolean logic still holds.

Original course module: https://www.cs.bu.edu/~best/courses/modules/Transistors2Gates/

Full Switchboard article: https://switchboardtechservices.com/articles/ancient-web-a-boston-university-page-still-teaches-how-transistors-become-logic/

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