This circuit is from 1964 documentation but can be easily implemented based on current components. Input waveforms and detection are shown next to the diagram.
We found this circuit in an 80's Electronic Design. It makes use of couplers of the time that can...
Found in a 1965 Electronic Design the purpose of this circuit is to control the gain of a stage by...
Employing the XR2206 IC, this circuit was found in the May 1977 issue of Radio Electronics...