Vdc Circuit Resonance

The following shows how to make a simple resonant circuit on PSpice (I recently found and installed this program on my computer, the key is to switch the battery off to the capacitor while simultaneously or some time after switching the capacitor on to the inductor of desired resonance at low resistances, this is all very simple, I hope it works in practice after all the components have been sodered onto a circuit board):



Here is something whereby the circuit current it regenerated by an operational amplifier feedback loop followed by a transistor booster amplifier.