Very interesting. I looked a bit at ModelingToolkit.jl but I did not think it was useful to perform circuit simulations.
I thought everything under the SciML umbrella was for machine learning. I thought it was mainly for creating models from empirical data. I must admit I have recently heard discussions on using these tools with “physics-based modelling” (Karen Willcox) to get improvements - but I don’t really have a grasp on how things fit together:
→ JuliaCon 2020 Live Session Wednesday - YouTube
I personally was leaning towards Modia.jl as a solution to this kind of thing:
https://github.com/ModiaSim/Modia.jl
Modia appears to follow in the footsteps of the Modelica toolset. I find the solutions look alot more like what you write in VerilogA/VerilogAMS - so I had a better idea how to approach the problem. I suppose I should look more into this ModelingToolkit package, then.
RFI
But if someone can point me to some useful information comparing these tools (Modia, ModelingToolkit, SciML) in the context of creating circuit simulations/simulators, I would very much appreciate it 
.