This circuit is from a 1980's documentation for telecommunications. The circuit is used in SSB and the diodes must be suitable types for the application. The audio input is low impedance.
The integrator in the figure is characterized by low input current and is based on an LM101A. C1...
This circuit was found in an ancient American documentation. The integrated circuit is of the time...
This circuit, from a 1976 documentation, amplifies signals from 100 Hz to 600 kHz with a voltage fan...