For one-off projects or prototyping, it’s not too hard to find a wall wart or power supply ... The second circuit presented adds voltage stabilization using a transistor and 78XX regulator.

How many integrated circuits do you need to build up a power supply that’ll convert ... (We would toss in a linear regulator somewhere.) Quibbling over circuit designs isn’t why you’re ...

is a block diagram ... regulator. LDOs are frequently used for the purposes of supplying the many different voltage rails required on the SoC, and for isolating the internal SoC circuitry from ...