This was the original title given by the publication of the 80s in which we found it. Similar versions can be found on the website under the name of rhythmic light.
The circuit shown is from an old European publication. In it we have the way to activate a relay...
We found this circuit in a European publication from the 1990s. Transistors are still common types...
This circuit was found in an American documentation and can be added to common amplifiers of any...