This circuit, which can act as a shield, was found in a 1990 PE Hobbyst Handbook. The circuit generates logic pulses for different types of applications.
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...