This circuit was found in the June 1980 issue of Radio Electronics magazine. The circuit uses an integrated circuit from time, and a power Darlington that must be equipped with a heat sink.
We found this circuit in a 1994 publication. It uses common components and can measure frequencies from 0...
We found this circuit in the 1983 edition of the Electronics Experimenter handbook. The circuit uses...
This is a possible setting for a Colpitts oscillator operating in the audio track. The shunt coil...