Found in documentation from the 1980s, this circuit can have several adaptations to use modern transistors and LEDs instead of the lamp. The power supply voltage can also be changed.
This configuration was found in a 1976 documentation. Note the use of pin 4 input for reset. The...
This circuit was found in the December 1993 issue of Electronics Now. With the components shown the...
This circuit was found in a 73 magazine for radio amateurs from the 90s. The circuit uses high...