Roman numeral display (CB22160E)

This circuit shows numbers I II and III when mounted on its side, depending on the position of the selector switch.

Cascading in 4013 (CB153E)
A binary counter until 2" or a divide-by-the same value can be built by cascading n 4013...
Digitally Controlled Oscillator (CB18268E)
We can control the frequency of an oscillator from digital circuits or from the output of a...
Field Strength Meter (CB6538E)
Found on Popular Electronics this circuit has variations found throughout this site and section....