This basic Schmitt trigger was found in an American publication from 1968. The circuit uses transistors from the time. Modern general-purpose types can be used.
This circuit was found in a 1966 publication using a microwave transistor of the time. The circuit...
The integrated circuit used in this application is the National Semiconductor's LM2907, the...
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...