This Hughes circuit is from 1968. Equivalent modern components can be used. The input impedance is 1000 M ohm.
Using a 4018 IC and one gate of the 4081 it is possible to divide the frequency of digital signals by...
This logic gate that increases the duration of input pulses was found in a NASA documentation from 1966....
This traditional TTL configuration was obtained in a 1977 documentation. The supply must be made...