Found in documentation from the 90s, this circuit was used in communications receivers of the time. MOSFET is a component of the time, uncommon today.
This detector uses an unusual sensor today. The circuit is from an 80s documentation. Its...
This circuit was found in the December 1976 issue of Radio Electronics magazine. The circuit...
For inductive loads we have the configuration shown in the figure. Note that the opto-coupler...