How does this man get his currents?

  • Thread starter Slightly
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In summary, The individual is struggling to understand how the currents in a given circuit are produced, specifically due to the presence of a diode and its corresponding notation. The circuit and its accompanying equations are attached, with the third equation being unhelpful as the function f is unknown. The problem ultimately leads to the van de pol equation.
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Slightly
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How does this man get his currents?

1. Homework Statement [/b]

I'm having a time trying to figure out how these currents are made.

I don't understand his notation. It seems simple, but it is going the opposite way of what it should be doing because of the diode, right?

Attached is the circuit and his formulations of the currents.
 

Attachments

  • how does this work.png
    how does this work.png
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  • van der pol circuit.png
    van der pol circuit.png
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  • #2
f(...) is the current through the diode as function of its voltage. As long as f is unknown, the third equation says nothing interesting.
 
  • #3
We are trying to find what f is.

Turns out that this turns into the van de pol equation.
 

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