Found in Motorola documentation from the 1970s, the circuit presented uses a component from the era that is not common today. The characteristics of the coils are given next to the diagram.
This circuit is from a 1991 publication. It divides the frequency of a TTL signal applied to its...
This circuit applies to other operational ones, other than the one indicated. The formulas next to the...
To small metal plates are used as sensor in this circuit. The skin resistance is enough to trigger the...