This circuit was found in a National Semiconductor manual from the 1980s. The integrated circuits used are equivalent. Note the need for a symmetrical power supply.
This circuit called “surf man” was published in the August 1992 Radio Electronics magazine. It...
This Hartley oscillator uses an audio output transformer that can be obtained from small, unused...
The oscillator shown in the figure can generate signals between 3 and 15 MHz approximately, depending...