K123 L 1 L 2 L 3 0. 9999 Q1 2 3 4 Q2 N3 904 . LI B . OPTI ONS RELTOL=0. 01 . PROBE . T RAN/ OP 1 U 10 0U 0 . 1S U UI C . I C V( 2}=0 . END The output of this analysis is shown in Figure 7-20.
7.3.2. Hartley Oscillator This type of oscillator also uses inductive feedback, but from a tapped coil. The output frequency of this oscillator is given by a similar equation to the one for the Armstrong oscillator. Only the inductance must be modified to include both of the components of the inductance and the mutual inductance, L M (L1 + L z + 2L M ). The pulse method of starting is used for this oscillator. The name of the starting pulse generator is VSTART. The output frequency of this oscillator is approximately 2.25 MHz. The circuit diagram of this oscillator is shown in Figure 7-21. The netlist for this oscillator is
