Version 4
SHEET 1 880 680
WIRE 144 112 144 64
WIRE 80 128 80 112
WIRE 112 128 80 128
WIRE 320 144 176 144
WIRE -368 160 -368 144
WIRE -176 160 -368 160
WIRE 96 160 -96 160
WIRE 112 160 96 160
WIRE 96 352 96 160
WIRE 128 352 96 352
WIRE 320 352 320 144
WIRE 320 352 208 352
FLAG 144 -16 0
FLAG 144 256 0
FLAG -368 64 0
FLAG 80 112 0
SYMBOL voltage -368 160 R180
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(-0.2 0.2 0 0 0 0.5 2)
SYMBOL voltage 144 160 R0
WINDOW 0 24 96 Left 2
WINDOW 3 24 16 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 3
SYMBOL voltage 144 80 R180
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value -3
SYMBOL res 112 368 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 6.8K
SYMBOL res -80 144 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 100K
SYMBOL Opamps\\LT1001A 144 208 M180
SYMATTR InstName U2
TEXT 320 -40 Right 2 !.tran 1
TEXT -792 232 Left 2 !.step param X list 1 1MEG
