|
The Hartley uses a tapped inductor, and that's what we have here. The tap happens also to be ground, a bit unusual but the concept is similar. Most Hartley oscillators have the tap going to cathode, the resonant circuit between grid and ground.
Colpitts, on the other hand, uses two capacitors for a tap and doesn't tap the coil.
So this circuit doesn't really act like either one. The bottom line is that you need frequency selective feedback and gain.
|