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How to set up a diff equation for circuit with a diode?


I'm kind of curious how to set up a nonlinear differential equation and
then solve it using NDSolve in case of the following setup:

Battery V in series with a diode, R and L.

To simplify, we may assume that diode is a pure conducting device in
forward direction and pure blocking device in the reverse direction.

Now how to set up a differential equation for the current I(t), that is
solvable using NDSolve?

Thanks
Mike


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