Fast adder 1 (CB7055E)

We found this circuit in an Electronic Engineering from the 90s. It applies to any logical family.

Proximity Detector (CB11566E)
This circuit is from a 1965 Argentine publication (Radio Chassis Television). The original...
Solar activity detector (CB23584E)
Very rapid brightness changes or flares that occur on the sun can be detected with this circuit that...
High Pass Filter II (CB19679E)
The components of this filter are calculated using conventional formulas (see mathematics section of...