Chua ... no idea

Shake your phone to get a DC signal 200 mV at op amp output

Sorry 200 mV on capacitor and 400 mV on output

http://everycircuit.com/circuit/5857885702324224

@schernya, this ain't a Chua oscillator. A Chua oscillator generates a waveform which is chaotic; doesn't repeat itself. Yours is a simple oscillator. Thanks though.

@fatcat, user kiani made many Chua circuits on EC

Sadly, he deleted most of his early contributions. @thebugger, @jason9, @hurz and sine-eyed had made these circuits. The first two circuits are there. I wonder how those values were calculated.

It’s not a chua, nut it’s related: 6606982088491008

I also managed to make this work via trial ‘n error. The inductor and capacitor values from left to right are: 5.6μH, 330pF, and 10pF. The resistor connected between ground and the negative terminal of the OP-amp is 680Ω. The rest is the same. This oscillates chaotically at 5MHz.

Thanks a lot! Now I'd have to figure out how it works. Are there any applications for this thingy?

Not that I know of, although it could be used as an RNG but I think there are better sources of randomness that produce more random information in the same amount of time, but actually the circuit above is 5MHz which I think is probably pretty fast.

Is it possible to make an EMP jammer with this?

Did you use this equation found in wiki: 3-(2a-beta... ?

For the Chua circuit I didn’t use any math. I just tuned the values and tried to push it in the direction that I thought it needed to go in and I eventually got it to where it worked. For the Lorenz Attractor I just recreated the wikipedia equations in circuit form using Gilbert cells for multiplication. Also, for an EMP jammer something to the effect of a Tesla coil would probably work well. All a Chua circuit does is randomly switch which side of 0V it’s oscillating on which I don’t think helps much when doing EMP jamming. For more on EMP jamming and anything radio-related @thebugger will likely be able to help. I don’t know much in this area.

I'd thought that this thingy generates a whole lot of high frequency harmonics. That would've helped, but the power is too low, it seems. Thanks for the explanation.

PS I found several equations with d/dx (I'm "afraid" of differentiation).

Well, as I understand high frequency harmonics are mostly generated by sharp edges like a tesla coil discharge or suddenly breaking the current flow of an inductor. Also, the d/dx just means rate of change, so if it’s d/dx = f(y) then it means the rate at which x changes is determined by f(y) which can be modeled perfectly by setting the current through a capacitor to be equal to f(y) and the voltage of the capacitor being x.

Thank you very much. Yup, this doesn't seem to create any higher-order harmonics.

No problem.

Why’d you give me that link?

Oops; I'm really sorry. It happened becoz of my carelessness. This'll never happen again. I was in a hurry. You can ignore that; I just pasted a link, which was the wrong one. Check out this one instead:- http://everycircuit.com/circuit/5849273990905856

I regret it. Can't do anything except ignoring it.

delete the ground on the schematic and ground only the voltage source.. and see what happens!

@gerardg woah that’s interesting. Didn’t expect that to happen!

@gerardg, a periodic oscillator can be made in that way, except that the resistor between the output and the non-inv. terminal is ~5k ohms.