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.

Signal Injector and Follower (CB18811E)
This ultra-simple test circuit is of great use in any electronics bench. The power is supplied by a...
12-Bit A-D Converter (CB5025E)
This circuit was found in an Electronics World magazine from 1990. The circuit can be mounted...
100 MHz harmonic oscillator (CB9659E)
This Pierce oscillator was found in American documentation from the 1980s. Transistors support modern...