This circuit was found in an Electronics Now. Its purpose is to generate clock pulses for a synchronized strobe system. The circuit uses components that are still common today.
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...