Originally, this circuit was created to monitor the liquid level in the reservoir of a car's windshield wiper. The circuit is from documentation from the 90s.
This circuit was found in Texas Instruments documentation from the 1980s. The circuit has a Q less...
In the figure below we have the connections of an automotive alternator in a triangle. The diodes...
This circuit covers 400 kHz to 40 MHz in three bands according to the selected coil. The double...