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.
Short square pulses trigger this damped oscillator. The frequency of the damped oscillations is...
Based on common components, this circuit was found in an English publication. The circuit is...
This circuit is from a 1977 publication for radio amateurs presenting a crowbar protection. The...