UPS Keeps Computers Humming (.PDF Download)

In the 1970s, a Popular Mechanics article described how to build your own UPS using a car battery charger, a car battery on a rubber drain board, and a 12-Volt inverter. The charger kept the battery charged as long as power was present, and the battery ran the inverter on its own charge for a while when the main power disappeared. It was an ungainly device and delivered brutal square-wave power that would be troublesome for a lot of today’s more delicate equipment. Still, it em

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