Medium impedance stage (CB20563E)

We found this circuit in an English publication from 1963. The circuit uses germanium transistors of the time.

Fast Integrator (CB15890E)
The integrator in the figure is characterized by low input current and is based on an LM101A. C1...
Differential Multiplexer (CB5352E)
This circuit was found in an ancient American documentation. The integrated circuit is of the time...
Multipurpose Amplifier Module (CB13390E)
This circuit, from a 1976 documentation, amplifies signals from 100 Hz to 600 kHz with a voltage fan...