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 September 30, 2021technologyhistoryscoper https://spectrum.ieee.org/a-half-century-ago-better-transistors-and-switching-regulators-revolutionized-the-design-of-computer-power-supplies