This circuit was found in a Popular Electronics from the 90s. The transistors are general purpose, and the gain depends on the ratio between R2 and R1.
This circuit delivers at its output a voltage that proportional to the amplitude of the input...
This circuit can be used to listen for SSB signals on receivers that do not have the built-in...
We found this circuit in a 1970 General Electric manual. The circuit uses components that are...