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 small auxiliary amplifier was found in a Radio Electronics from May 1958. Power is supplied with...
This traditional triplier configuration with the 555 can be found in other articles on the...
Indicated for activation by microcontrollers, this circuit was found in the Radio Electronics...