We had found this circuit in a January 1961 Radio Electronics Magazine. Using it is possible to take measures from the gain of transistor with a common a multimeter.
A binary counter until 2" or a divide-by-the same value can be built by cascading n 4013...
We can control the frequency of an oscillator from digital circuits or from the output of a...
Found on Popular Electronics this circuit has variations found throughout this site and section....