Fast adder 1 (CB7055E)

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

Metal Detector (CB15795E)
This metal detector was found in a 2001 Poptronics, but it can still be easily assembled, as the...
Random neon lamps (CB7236E)
This circuit for 6 lamps was found in old American documentation. The supply is of high voltage...
Stereo Balance Indicator (CB16346E)
With this circuit it is possible to have a safe indication of the balance point for the signals of the...