Optical sensor for PC (CB20548E)

This circuit was found in a PC documentation from 1996. It can be used as a shield with modern microcontrollers.

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...