This circuit was found in the August 1997 Electronics Now magazine. The circuit uses well-known operational codes and generates signals up to 20 kHz.
This circuit is from an old American publication, but it can be easily implemented with modern...
Found in a 1960 Mullard transistor manual, this circuit uses components from the time....
This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be...