Version 4
SHEET 1 1356 708
WIRE -240 64 -320 64
WIRE 144 64 -16 64
WIRE -320 96 -320 64
WIRE -16 96 -16 64
WIRE 144 96 144 64
WIRE -16 208 -16 176
WIRE 144 208 144 176
WIRE 144 208 -16 208
WIRE -320 224 -320 176
WIRE -16 224 -16 208
WIRE -240 272 -320 272
WIRE 144 288 -16 288
WIRE -320 304 -320 272
WIRE -16 320 -16 288
WIRE 144 320 144 288
WIRE -320 432 -320 384
WIRE -16 432 -16 400
WIRE 144 432 144 400
WIRE 144 432 -16 432
WIRE -16 448 -16 432
WIRE 144 528 -16 528
WIRE -16 560 -16 528
WIRE 144 560 144 528
WIRE -16 672 -16 640
WIRE 144 672 144 640
WIRE 144 672 -16 672
WIRE -16 688 -16 672
FLAG -16 224 0
FLAG -16 448 0
FLAG -320 224 0
FLAG -320 432 0
FLAG -240 64 Vsa
FLAG -240 272 Vsb
FLAG -16 64 1
FLAG -16 288 2
FLAG -16 688 0
FLAG -16 528 3
SYMBOL Misc\\EuropeanResistor 128 80 R0
SYMATTR InstName R1
SYMATTR Value R = 0.55 - 0.25*( (abs(((V(Vsa)-V(Vsb))*1000)-5.9)-(abs(((V(Vsa)-V(Vsb))*1000)-6.1)-0.2))/(2*0.2) )
SYMBOL current -16 176 M180
WINDOW 0 24 80 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName I1
SYMATTR Value 1
SYMBOL Misc\\EuropeanResistor 128 304 R0
SYMATTR InstName R2
SYMATTR Value R = 0.55 - 0.25*( (abs(ISH()-5.9)-(abs(ISH()-6.1)-0.2))/(2*0.2) )
SYMBOL current -16 400 M180
WINDOW 0 24 80 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName I2
SYMATTR Value 1
SYMBOL voltage -320 80 R0
SYMATTR InstName V1
SYMATTR Value 2m
SYMBOL voltage -320 288 R0
SYMATTR InstName V2
SYMATTR Value 1m
SYMBOL Misc\\EuropeanResistor 128 544 R0
SYMATTR InstName R3
SYMATTR Value R = ISH()
SYMBOL current -16 640 M180
WINDOW 0 24 80 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName I3
SYMATTR Value 1
TEXT -320 -8 Left 2 !.op
TEXT 152 8 Left 2 !.func ISH() {((V(Vsa)-V(Vsb))*1000)}