Low-cost superregs - design, performance and stability

Eugene Dvoskin needed a pair of high performance voltage regulator to provide very clean power to one of his projects. An online search turned up the very high performance of the regulator family often classified as ‘superregs’.  However, Mr. Dvoskin decided to try to emulate the very high performance but using lower cost and more common parts. To that end it was necessary to delve into the details of the regulator circuits to find out what it was exactly that led to the exemplary performance, and how to reach it with simpler and lower cost means.