A traditional Hartley oscillator's resonant circuit consists of a tapped inductor and resonating capacitor (a). Allowing for mutual coupling between windings produces an equivalent circuit containing a negative inductance (b). Replacing the negative induc
Figure 1. A traditional Hartley oscillator's resonant circuit consists of a tapped inductor and resonating capacitor (a). Allowing for mutual coupling between windings produces an equivalent circuit containing a negative inductance (b). Replacing the negative induc