This circuit was found in a 90s EDN. Its purpose is to increase the efficiency of operational amplifiers. Power MOSFETs and inverted zeners support equivalents.
This circuit is from a 1954 transistors publication. The transistors are the CK722 among the first...
We adapt this circuit of Radio Electronics - March 1990. The magazine no more exists, but the...
This circuit uses a dual floodgate MOSFET not very easy to obtain today. Its handling is very...