Found in a RE Experimenter Handbook from the 90s, this circuit is intended for the use of LEDs in a flashing system for Christmas trees. The circuit can be expanded
Other operational amplifiers series operatives, such as MC34072, MC34074, MC35071, MC35072,...
This circuit was obtained in a 1967 General Electric documentation. It is a relaxation oscillator...
This circuit is from the 1983 Intersil Databook. This is a configuration that is still used today...