With this circuit, from an old operational datasheet, it is possible to measure the CMRR, rejection in common mode of an operational one. The power supply must be symmetrical.
This circuit was found in an 80's Electronic Engineering. The circuit uses operatives of the time...
This circuit was obtained in a 90’s American documentation. The FET can be replaced by a modern...
This unregulated low voltage source was found in the July 1962 Radio Electronics magazine....