The circuit shown is from National Semiconductor's Linear Applications Handbook. It makes use of the LM78S40 which is not an easy component to obtain today.
The integrated circuits in this application are not very common today. One consists of an A / D...
Found in the Encyclopedia of Electronic Circuits Volume 5 of 1995 this circuit has the gain...
The output power of this amplifier depends on the supply voltage that can be between 3 and 16 V....