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An external power supply, AC adapter or power brick, is a power supply located in the load's AC power cord that plugs into a wall outlet; a wall wart is an external supply integrated with the outlet plug itself. These are popular in consumer electronics because of their safety; the hazardous 120 or 240 volt main current is transformed down to a ...
A regulated power supply is an embedded circuit; it converts unregulated AC (alternating current) into a constant DC. With the help of a rectifier it converts AC supply into DC. Its function is to supply a stable voltage (or less often current), to a circuit or device that must be operated within certain power supply limits.
Original Roubo workbench plans, 1769 The workbench of a hobby electronics enthusiast with an oscilloscope, PC, two digital multimeters, soldering station, pocket calculator, small tools, a stabilized power supply unit and storage boxes on the wall for electronic components
Due to this, the majority of power-supplies are one-quadrant (source only, with fixed polarity), and in most cases constant-voltage operation. Bench power supplies might add constant-current operation as well as providing limited measurement capabilities, but these are in many cases still one-quadrant only and with margins of errors acceptable ...
Micro, mini, benchtop, standing on floor, large, very large, gigantic Power source Line-shaft-drive versus individual electric motor drive Most line-shaft-drive machines, ubiquitous circa 1880–1930, have been scrapped by now Hand-crank-power versus electric Hand-cranked not used in industry but suitable for hobbyist micromills