We found this circuit in the August 1994 issue of Electronics Now magazine. The circuit is based on the now uncommon CMOS 4046. The frequency range is given by C1.
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...