The circuit shown in the figure can be designed with more modern operational amplifiers, as it is from 1994 documentation by National Semiconductor. The power supply must be symmetrical.
This circuit was found in the January 1995 Electronics Now magazine. Its configuration is valid for...
This circuit with transistors in parallel was found in a Radio Electronics of August 1952....
We find this simple circuit in an English publication called Electronic Circuit Design no. 3 of...