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.
In the figure we have the way to control the frequency of an oscillator with a NE602 using a...
We found this circuit in the April 2013 issue of Electronics Now. Any JFET can be used. Note the...
This circuit, which we find in a documentation from the 70s, filters out the Ru [occurring in...