Found in a 303 Circuits from the 90s, this circuit converts signals from the 10 kHz to 150 kHz band to the 4.01 to 4.15 MHz band.
This circuit is from a 1970 publication. The time constant is given by 1.3R x C where R is the...
The range of this circuit is very small, serving only for applications that involve the location of...
This practical idea from a 1992 documentation shows how to count the turns of a winder using a...