Three-input majority gate (CB7248E)

This interesting logic circuit was found in a manual of neon lamp applications.

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Selection of diode inputs (CB4111E)
This circuit is used in transceivers, enabling input selection by diode switching through polarity...
One Quadrant Logarithmic Converter (CB15070E)
This configuration was found in an American publication from the 90s. Operators admit equivalents just...
Fire Detector (CB13985E)
This circuit was found in an Italian magazine Elettronica Prática of 1977. The transistors can be...