A Half Century Ago, Better Transistors and Switching Regulators Revolutionized the Design of Computer Power Supplies

Apple, for one, benefited, though it didn’t spark this revolution, as Steve Jobs claimed
 

Photo: David Arky

Intel Not Inside: X-rays reveal the component parts of a switching power supply used in the original Apple II microcomputer, released in 1977.

Computer power supplies don’t get much respect.
As a tech enthusiast, you probably know what microprocessor is in your computer and how much physical memory it has, but odds are you know nothing about the power supply

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