Found in a 1980s telecommunications documentation, the circuit presented acts as a product detector. The modulator or mixer in the square may be that of the previous circuit.
We found this circuit in an Electronics Handbook from the 1980s. It filters out noise from a radio...
This circuit can be implemented with discrete transistors. We found it in General Electric's 1964...
We found this powerful amplifier that uses common transistors in a 1998 documentation. The power...