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.

Digital Amplifier (CB192E)
When more current from a digital output is needed than a single output could source or drain, a...
Amplifier for microammeter (CB3927E)
This sensitive amplifier for low current measurement uses a differential amplifier configuration with...
Variable Active Bandpass Filter 741 (CB5197E)
This variable bandpass filter was found in an American 1980s documentation. The power supply must be...