Has anyone noticed this FEM plugin?
It seems very interesting…
I just hear about in is this other attempt
that pop-up in a request for a specific function in the new API development.
I still have to give a try in some of these plugins.
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I do not need pcb voltage drop analysis so much myself. But my previous contract employer was using it for their system. If such thing is available it is good to know.
If FEA means Finite Element Analysis…what is FEM? Maybe frogs eat mice? 
… Method
OK…Frogs Eat Method. 
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OT: check out Mairzy Doats, a novelty song from 1943.
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Have you been able to figure out what those videos demonstrate? Seems like he selects a net and then enter two different voltages on the same net? Does that make sense?
As per readme at github
simulator to plot power density and voltage on PCB geometries.
If you have multiple power sources and power sinks the voltage on your power plane won’t be V+ everywhere and your ground plane does not have 0V everywhere. This simulation can visualize the current densities and voltage drops and you will see where there are possible problems with your design. Here is a more complex analysis for example.
In Altium it’s a integrated tool.
Should be interesting, now the KiCad teams are structuring the new API, ask by a 3D viewer API? (for maybe, future transparent integration)