This circuit consists of an improved version of the CIR5892, using two transistors and adjusting the operating point. The transistors can be the BC548.
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...