Version 4
SHEET 1 896 680
WIRE 32 96 16 96
WIRE 128 96 112 96
WIRE 144 96 128 96
WIRE 256 96 224 96
WIRE -208 128 -208 112
WIRE -80 128 -80 112
WIRE 192 208 192 192
WIRE -208 224 -208 208
WIRE -80 224 -80 208
WIRE 128 224 128 96
WIRE 160 224 128 224
WIRE 256 240 256 96
WIRE 256 240 224 240
WIRE 160 256 0 256
WIRE 0 272 0 256
WIRE 192 288 192 272
WIRE 0 368 0 352
FLAG -80 224 0
FLAG 192 192 +V
FLAG -80 112 +V
FLAG 192 288 -V
FLAG -208 224 0
FLAG -208 112 -V
FLAG 16 96 0
FLAG 0 368 0
SYMBOL voltage -80 112 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL voltage -208 112 R0
SYMATTR InstName V2
SYMATTR Value -5
SYMBOL res 240 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 1K
SYMBOL res 128 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 1K
SYMBOL voltage 0 256 R0
SYMATTR InstName V3
SYMATTR Value SINE(0 1 1K)
SYMBOL opamps\\LT1881 192 176 R0
SYMATTR InstName U1
TEXT 224 352 Left 2 !.tran 3m