We found this circuit in a 1966 US documentation. It simulates a variable capacitor that can vary capacitance from 1,000 to 1. Transistors are general purpose types.
In the figure we have one of the many ways to program the counting of a 4017. The circuit uses...
We found this circuit for vocal effects in the September 1990 issue of Radio Electronics magazine. The...
This TTL module can be used in counter and many of them can be cascaded to counts up to 99, 999,...