Suggested by Intersil in documentation from the 90's, this circuit is valid for modern operating equivalents, including types that operate with low voltages.
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...