This Schmitt trigger that converts rectangular signals to square signals was found in the January 1994 issue of Electronics Now magazine. The circuit uses common general-purpose transistors.
This sensor circuit for currents of the order of nanoamperes was found in an American...
This circuit was obtained from a 1964 magazine and has some interesting features such as the input...
Suggested by a 90’s Radio Electronics, this circuit automatically activates the recording switch of an...