Simple Charger (CB26302E)

This charger for small batteries was obtained from the 1982 Radio Experimenter Handbook. The circuit is low current.

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Divide-by-7 Counter - 4018 (CB169E)
Using a 4018 IC and one gate of the 4081 it is possible to divide the frequency of digital signals by...
Pulse extender (CB7255E)
This logic gate that increases the duration of input pulses was found in a NASA documentation from 1966....
LED Flasher 7400 (CB13719E)
This traditional TTL configuration was obtained in a 1977 documentation. The supply must be made...