Just wondering cus like wouldn’t it be more convenient to just plug your phone into the wall without a brick, or like cheaper to build a pc without a power supply? why do these devices need DC but lamps, fridges, fans, most household appliances can run off AC?
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Motors and heating elements run fine with AC. Transistor based circuits tend to explode when their supply is AC. Processors designed so small that 2V already risks internally arcing across wiring really don’t like 230V. If your device is more complex than a motor with a switch, it starts making sense to have a DC power supply.
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