This dual balanced modulator configuration was obtained in a 1980s telecommunications documentation. The circuit makes use of transformers and the diodes are commonly used.
This simple circuit uses a 200 µA galvanometer to measure voltages in three ranges. The circuit...
This circuit was found in a 1958’s publication. It uses germanium transistor, availble that time....
This circuit is suggested by RCA and is based on a dedicated integrated circuit that is the...