This signal injector and tracer (follower) was found in an old American documentation. The transistors can be general use and power is made with one or two common cells.
We got this circuit in a publication of 1987. This is an audio limiter, a circuit that cuts peaks...
This circuit can be used with motors or resistive loads, such as heaters and incandescent lamps....
This circuit, which in our times would be called a shield, can also be used with other loads. The...