This indicator or logic probe was found in the April 1979 Radio Electronics magazine. The integrated circuit is the 555 and the FET can be any general-purpose type.
The SAA1027 integrated circuit was specifically developed to control stepper motors with a 500mA...
Found in a 1965 Electronic Design, this circuit can be made with modern equivalent transistors. The...
This circuit was obtained in a 1994 documentation and its purpose is to time the activation of a...