Less-than-honest descriptions/assertions about an electrical power-supply that is supposed to produce "dee-cee" (i.e., direct current), but is in fact just a simple "ay-cee" (i.e., alternating current) transformer, with no costly diodes or capacitors included inside.
Some companies are deeceetful in their manufacturing of plug-in wall-power-packs for consumer electronics --- rather than using a "square-group" of four diodes to make a proper full-wave rectifier, they just stick a single diode in there to make a crude half-wave rectifier, which not only produces a lot more hum and much "choppier" DC voltage, but also utilizes less than half the current-output of the transformer.
by QuacksO November 17, 2019