The purpose of this circuit is to extend the range of applications from a Darlington pair to DC. The circuit is from an American documentation from 1970.
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...