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NOTE: not oscillating continuously in the simulation. If you know why please comment and also read description.
Just a regular LC oscillator except when you turn it on, it’s should keep on oscillating without dying out. It doesn’t seem to be working but here’s how it should work:
The capacitor gets charged up and when you flip the switch, it starts oscillating between the inductor and capacitor, just like any other LC oscillator. However, when the top part of the capacitor becomes positively charged, that voltage opens the gate of the N-Channel MOSFET. The drain and source of the mosfet is connected to the voltage source and one leg of the capacitor. So when the positive half-cycle of the LC oscillations opens the gate of the MOSFET, it ends up charging the capacitor up even more. Then, as the oscillations get pulled into the next half-cycle, that causes the gate of the mosfet to be negatively charged, which fully shuts it off. The only problem is that the extra current from the power supply ends up just going straight back to the negative end, so to counter this there is another capacitor between the LC circuit and the negative end. So rather than going straight back to the supply, that capacitor gets charged up, and eventually recharges the LC capacitor. The problem with this setup is that in the simulation the capacitor I added doesn’t want to discharge to the LC capacitor but rather to itself. Hopefully in real life the charge on the extra capacitor will just be attracted by the opposite charge of the other capacitor, but I’m not sure if it’ll work.
So hopefully, when the capacitor and inductor oscillate, rather than losing energy each cycle, the capacitor gets recharged every half-cycle, which creates continuous oscillations! The frequency can be adjusted simply changing the values of the capacitor or inductor.
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