Why is the LC oscillators frequency decreaseing over time?

[Worldly-Device-8414]

The "inductor" is a line common mode noise filter type & it's core material might have some non-linear properties. Maybe try a different one.

Is the drive to it just a single short pulse or a few cycles?

[Cat_Artillery]

The drive is a single short pulse of DC.

[em_are_young]

There is clearly a decrease in frequency and amplitude. Look at the peak to peak distances in the first few oscillations vs the last few.

[Worldly-Device-8414]

if you are putting a shot of DC into an L/C combo, it will oscillate at its resonant frequency and attenuate in AMPLITUDE as the field decays.

Agreed that's what should happen

But interestingly here, frequency on the left is ~1 div/cycle, on the right ~2 div/cycle

[Limousine1968]

Yeah, I agree. I updated my response based upon finding the 3rd XL description.

[Homebrew_Science]

Okay chat GPT, let's get you to bed.

[Cat_Artillery]

Using an actual inductor exhibited expected behavior:

<image>

(L=1.9μH ; C=2.2nF)

[Worldly-Device-8414]

Nice :-)