Problem on a chaotic circuit.


by Lasha
Tags: chaotic, circuit
Lasha
Lasha is offline
#1
Dec25-13, 08:47 AM
P: 22

windows screen capture
So I built this circuit(Chua's chaotic circuit) and I have to take it to the lab for plugging it to oscilloscope.I need to make sure it works, cause I won't have any time there to fix it or rebuild it.So when I i tested it with the multimeter,there was no voltage on the left side and there was a voltage of a constant value on capacitors(I checked the connections and everything is okay).So is this because of the frequency? Or am I doing something wrong?(Note:left side has to behave like an inductor)
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vk6kro
vk6kro is offline
#2
Dec25-13, 10:02 AM
Sci Advisor
P: 4,010
Could you supply a circuit diagram?

Check all wiring. The power supply pins on the ICs should have the right voltages on them. These stay constant so they are a good starting point.
Lasha
Lasha is offline
#3
Dec25-13, 12:24 PM
P: 22
This is the schematic: .

This is the function of a chua's diode, g(x)is resistance vs current:


This is the double scroll

:

Yes, but shouldn't it oscillate?I highly doubt its a connection problem.

vk6kro
vk6kro is offline
#4
Dec26-13, 01:46 AM
Sci Advisor
P: 4,010

Problem on a chaotic circuit.


You can't tell if something is oscillating when you use a multimeter. You might get a reading on AC volts but these ranges are often pretty insensitive.

So, you may have to wait until you get an Oscilloscope connected to it.

Incidentally, you may be surprised how cheap oscilloscopes can get.

Digital oscilloscopes from China have entered the market and that leaves a lot of unused, perfectly OK analog oscilloscopes available.

There are also plenty of handheld oscilloscopes like this one:
http://www.ebay.com.au/itm/Mini-ARM-...item33801dd01c

I don't know if you would find $70 expensive or if the 1 MHz bandwidth would be a little too low in performance for you.

In the meantime, I would really check those voltages and connections. I don't trust breadboards, so the time to find any problems is before you leave home.

I saw a report that said those circuits were difficult to get going, so it will be interesting to see how you get on.
Lasha
Lasha is offline
#5
Dec26-13, 04:43 AM
P: 22
Quote Quote by vk6kro View Post
You can't tell if something is oscillating when you use a multimeter. You might get a reading on AC volts but these ranges are often pretty insensitive.

So, you may have to wait until you get an Oscilloscope connected to it.

Incidentally, you may be surprised how cheap oscilloscopes can get.

Digital oscilloscopes from China have entered the market and that leaves a lot of unused, perfectly OK analog oscilloscopes available.

There are also plenty of handheld oscilloscopes like this one:
http://www.ebay.com.au/itm/Mini-ARM-...item33801dd01c

I don't know if you would find $70 expensive or if the 1 MHz bandwidth would be a little too low in performance for you.

In the meantime, I would really check those voltages and connections. I don't trust breadboards, so the time to find any problems is before you leave home.

I saw a report that said those circuits were difficult to get going, so it will be interesting to see how you get on.
Thanks for the advice, I'll post an update on how it worked out.The reason I chose the breadboard
over a PCB, was that I'm planning on experimenting(different combinations and values of resistance and capacity)
As for the oscillator,I'm planning on buying the Sinometer ST16B 10MHz oscillator,cause price difference is only 100$,but quality looks a lot better.Only problem is that it says "X Y mode" does that mean that it can't graph in 3 dimensions?
AlephZero
AlephZero is offline
#6
Dec26-13, 10:21 AM
Engineering
Sci Advisor
HW Helper
Thanks
P: 6,388
You can't "graph in 3 dimensions" on any oscilloscope. Some scopes have a "Z" input channel that modulates the brightness of the trace as it is being drawn, but that's not the same as creating 3-D graphics.


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