This circuit has a gain of 34 dB and a good power to be used as an audio booster in cars. The configuration was found in the 1982 SGS linear integrated circuit manual.
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...