* chua-circuit.i
* Chua's Circuit, Kimmo Silvonen 5.11.2012
* This file can be run (among others) with the APLAC version (7.80) used in the laboratory (saatavilla Kimmolta)

* Chua's Diode based on two parallel-connected piecewise linear negative resistances
* Details in Elektroniikka ja puolijohdekomponentit

opamp o1 1 2 3 0 $ nonideal opamp model used
opamp o2 1 4 5 0 $ nonideal opamp model needed
res r1 1 3 220
res r2 2 3 220
res r3 2 0 2.2k
res r4 1 5 22k
res r5 4 5 22k
res r6 4 0 3.3k

* Rest of the circuit
Res R  1 7 1.9k
Cap C1 1 0 22u U0=0.1
Cap C2 7 0 220u u0=0.0
Ind L  7 0 55

Sweep "uC1 as a function of time, R=1.9k, C1=22 uF, C2=220 uF, L=55 H" 
+ LOOP 8001 time LIN 0 40
+ GRID 
+ BIG_SCREEN
+ Y "uC1" "V" -10 10
Show Y vtran(1) width=2
EndSweep

Sweep "uC2 as a function of time, R=1.9k, C1=22 uF, C2=220 uF, L=55 H" 
+ LOOP 8001 time LIN 0 40
+ GRID 
+ BIG_SCREEN
+ Y "uC2" "V" -2 2
Show Y vtran(7) width=2
EndSweep