This circuit of an EDN divides the input pulse frequency by even values. The circuit is TTL and can be used as a shield for microcontrollers.
This configuration was found in old documentation and is valid for most general purpose NPN...
This circuit uses a capacitor to store energy. The capacitor is charged by closing S1 by a moment. Them,...
This circuit was obtained from a Popular Electronics of the 80's. It is set to a certain pulse...