Found in a 90’s American documentation, this circuit indicates the frequency of input pulses up to 1 kHz. The circuit has a very explored configuration on this site.
Found in the April 1995 issue of Electronics Now magazine, this circuit provides an output voltage...
This circuit keeps a flashing LED when a balcony lamp, for example, is turned off. As a result,...
This circuit was found in a 1964 documentation. It shows how to achieve automatic gain control for...