The circuit is of the Motorola Linear Databook of 1990. The power source must be symmetrical and the characteristics of the circuit are given next to the diagram.
This circuit was found in old American documentation. Transistor is general purpose and coil rated...
This circuit is from an article that teaches how to assemble it in the magazine Electronics Now...
This compressor that enhances the voice range is from the 1990 Motorola Linear Databook. The...