This circuit consists of an electrostatic sensor that can check if a cable is energized by simply approaching it. The circuit is from an Electronics Now from December 1998.
This is a common crystal oscillator configuration with 80s transistors. The circuit has the...
This circuit was found in a 90’s RF design. The circuit has an output frequency of approximately 100...
This one-digit photometer using CMOS circuits was found in a 1989 documentation. The circuit is...