Digital Fuel Gauge (CB26173E)

This two-digit circuit was found in the 1999 Radio Experimenter Handbook. It uses the CA3161 and CA3162 A/D converter pair common at the time.

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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...