This circuit provides an output voltage with approximately twice the input using two power transistors and a voltage doubler. The circuit is from a 1970 EDN.
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...