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Hello, I'm a student from France and i make a work on the oscilliator of Van der Pol. I found an electrical circuit on this website: http://www-physique.u-strasbg.fr/~udp/articles/nonlineaire.pdf pages 20-25. So i built this circuit on CircuitLab but in this circuit, there is no voltage source just the ampliop which can bring voltage. Which ampli i have to use? and how does it work? Thanks for your response and sorry for my poor english. Sincerely.

Do you have a link to your circuit? You'll have to make it public.

https://www.circuitlab.com/circuit/hyy49s/vanderpol/

The TL082 operates off of + and - 18V DC I think. Your input source is injected at OA7 negative input pin. I tried to study the Van Der Pol oscillator and I can't quite understand it.

@cheakyjojo,

Welcome to CL.

Well done! You almost got the whole thing right first time.

There were some wrong values and a couple of tricks needed to be added to make it play nicely with CL.

Try this:

@hondabones,

" Your input source is injected at OA7 negative input pin."

Not true.

It's an oscillator. Inject noise anywhere in the loop and it will start.

Search CL for

initial conditions

startup

Search also for:

time steps

@signality I agree, generally I see it started there.

Thanks for your help. But,I just have to sweep R7 for 1700Ohm to 4700. I didn't understand the section sweep parameters in time domain but now i do!