This circuit from General Electric was found in a 1967 documentation. The SCR is of the time, as are the transistors, but equivalents can be used.
We found this circuit in a 1980s documentation. The circuit uses general purpose transistors,...
This simple circuit for experimental LED sequencing is based on a multivibrator with transistors....
This circuit is from an American documentation from 1975. The circuit uses components of the time...