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 TTL bistable or flip-flop with the 7400 was found in an 80's publication. It is a didactic...
This circuit amplifies the signals of an operational amplifier with output values that depend on...
In the figure we have the simple way to use a low current switch or sensor to drive a high power...