This circuit is from Mullard documentation from 1969. Transistors support current equivalents. Output transistors must be mounted on heat sinks.
The circuit shown is from Motorola's 1990 Linear Databook. Shaded components are optional. The...
This circuit is from an English magazine of 1977. The circuit is still current, just using BC547...
This circuit is from a 1986 Revista Española de Electrónica. It consists of an amplifier with...