This circuit was found in an old American publication. It is valid for any operational. Formulas for component calculations are given next to the diagram.
This circuit was obtained in a 1967’s EEE. Transistors and integrated circuits can be replaced by...
This source, found in a 1991 publication, was originally designed to operate with the CB18736E, an alarm...
This circuit is from Motorola's 1990 Linear Databook. We can implement it with other operational...