The resonant frequency for the LC tank is: 1.5915457,
but in EC you only have two decimals to play with, so you can see that the input waveform, and the resonance F do not overlap perfectly, but none the less you can see that you can apply a kick to the oscillation of the LC tank to keep the resonance from dying out . It's sort of like a spinning wheel that you have to apply a forceful thrust to keep it spinning.
You can adjust the input frequency to see the wave-forms beginning to lose synchronization.
Notice that when the wave-forms are not in synch, the diode LED lights up, and that is due to the Phase angle difference of the two waves.
