This circuit was obtained from an old Signalite documentation. Neon lamps are special types of the time. The operation occurs at low frequencies.
This configuration was obtained in a 1977 FET Databook. The circuit can be practically any JFET...
This circuit was found in an old American documentation. The transformer is of the type found in...
This circuit was found in an English publication from 1989. The integrated circuits are of the...