This circuit was found in a 1968 General Electric documentation. It has an input impedance of 2 M ohms and excites a load of 16 ohms. The integrated circuit of the time is the PA237.
This circuit is based on an uncommon Texas component today, as found in an American 1980s...
Maxim suggests this circuit in documentation from the 1990s. The components are from the period and...
We found this circuit in a Popular Electronics from 1992. The transistor is general purpose,...