Posted on Feb 6, 2014

The same equations can also be applied to D2, R5 and R6 which forms the negative non-linearity of the circuit, although all the signs should be inverted for the threshold voltage equation. Between the positive and negative threshold voltages, only the negative resistance will be seen by the circuit. If the voltage moves out of this range, either D

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1 or D2 will start to conduct, which will insert a resistance parallel with the negative resistance, which will in effect decrease the negative resistance`s value. It is not that easy to build this circuit, the values are quite critical and it is not that easy to control any parameter via a computer. For this reason I have decided to write a computer simulation program for the Chua circuit. This program lets you adjust all the parameters, displays graphs in various formats, and it is also possible to save waveforms as. WAV files. The parameters L, C1, C2, G are the linear parts of the circuit and represents L1, C1, C2 and VR2 in the schematic. Bp1, Bp2, m0, m1 and m2 are the parameters for the non-linear negative resistance. Bp1 and Bp2 are the negative and positive threshold points. m0 is the resistance if the voltage is below Bp1, m1 if the voltage is between the two thresholds, and m2 if the voltage is above Bp2. The following set of screenshots displays graphs of Vc2 versus Vc1 for different values of C2. In the graph below the value of C2 is set to 0. 4. At this point there is not enough gain in the circuit to sustain oscillation and the oscillation dies out. I have build the circuit based on the schematic at the top. Below is a photo of the circuit. I got the variable inductor coil out of an old TV`s convergence circuit.

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