This circuit was found in a Mallory documentation from 1968. The integrated circuit is of the time, unusual in our day. Input sensitivity is 20 mV for 2 W output.
Indicated for applications with a PC, this circuit was obtained in an English publication in 1992....
No information is given on the transformer in this circuit that we found in an American 1967...
This circuit is from an ancient American documentation. The transistors are of the time and the...