The integrated circuit and configuration are uncommon. However, the sound quality is good. The circuit is from the 1983 Intersil Databook. The output transistors must be provided with heat sinks.
This configuration can be found at several points in this section and on this website. With the...
The circuit in the figure indicates when the input voltage exceeds a certain value adjusted by the...
This receiver was obtained in a documentation from the 90's and is of the super-regenerative type....