This circuit is from a Mallory 1968’s documentation. The integrated circuit is of the time and the transistor admits equivalents.
Found in ancient American documentation, this circuit uses some components from the time, such as...
A JFET is used in this circuit to maintain constant gain. The circuit is from an Electronics Now...
This very low power amplifier is designed by Amperex for hearing aids. It is based on TAA370 which is...