I am trying to simulate an oscillator in LTSpice.
So I tried to make a simple LC circuit.
Since a voltage source would not make the circuit oscillate,
I did not use a voltage source and made the capacitor start with 6 volts.
But for some reason the voltage just explodes and goes to almost 200kV.
I have no explanation for this phenomenon.
Maybe someone can help me with this.


  • \$\begingroup\$ Put realistic DCR in series with L and monitor current and compute energy \$\endgroup\$ Jan 18, 2021 at 22:26

1 Answer 1


To expand a bit on Tony's comment, LTspice has a default series resistance of 1m\$\Omega\$ for an inductor, so you have an initial current of 6,000A.

Aside from being pretty unrealistic unless the inductor and core were enormous, that means that there is 18,000 J of energy stored in the inductor, so one would expect a peak voltage across the capacitor of about 190,000 V from conservation of energy.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.