This 6-transistor Japanese radio from the 1960s used germanium transistors and had an output power of 180 mW. The circuit is of the superheterodyne type with push-pull class B output.
The configuration shown is from the 1994 Linear Applications Handbook, published by National...
This switching circuit for analog signals is from a 90’s Electronic Engineering. The components...
This circuit for recognizing a frequency with a narrow range was found in Radio Electronics...