**EDIT\_1 :**

* I replaced 2 capacitors that were 22F instead of 22 μF and updated the images.
* I stopped the simulation at t = 19.5μs as you can see on the image below because it is very slow, uses a lot of storage and the voltages values seem to already point to a problem.

I'm trying to learn how a **ring oscillator** works by simulating it using LTspice. But the various plots don't seem to be correct.
Below are two images showing the schematic and the plots.

[![Image of the ring oscillator schematic](https://i.stack.imgur.com/Jq1xE.jpg)](https://i.stack.imgur.com/Jq1xE.jpg)

[![Plot showing the result of the simulation](https://i.stack.imgur.com/M2EWV.jpg)](https://i.stack.imgur.com/M2EWV.jpg)
I found the original schematic [here](https://hackaday.io/project/8850/instructions)

**Made with LTspice XVII(x64) (17.0.21.0)**

Does anyone know what the problem is ?

Thanks