This comparator circuit was found in the May 1988 Radio Electronics magazine; The power supply does not need to be symmetrical.
This configuration was obtained in a 1977 FET Databook. The circuit can be practically any JFET...
The integrated circuit used in this regulator is not very common today. The circuit is from old...
The operational used is uncommon today, but equivalents can be used. Unlike the previous one, this...