This Adjustable Voltage Regulator is made by combining a common 78L05 with an integrated audio amplifier of the type TDA2030, an adjustable voltage regulator can be constructed in a very simple manner ...

A switched-mode power supply uses a galvanically isolated feedback portion of a PWM circuit (Figure 2). In designs that omit a voltage amplifier, a shunt regulator can serve as an inexpensive op amp.

QUESTION: There are so many different voltage regulators on the market these days. How do I pick one that will be good for my circuit? ANSWER: Wow, this is a tough question, but also a good one.