This precision reference circuit was found in documentation from the 1980s. It applies to other operational amplifiers. The power supply must be symmetrical.
We found this circuit in a Radio Electronics magazine from November 1976. The clock frequency is...
This circuit was obtained in a manual for radio amateurs from 1975. It is a circuit that allows the...
The LEDs act as diodes, so if good they will show the same characteristic curve. Arrangment shown...