Version 4
SHEET 1 1580 680
WIRE 32 16 16 16
WIRE 128 16 112 16
WIRE 160 16 128 16
WIRE 256 16 240 16
WIRE -192 112 -192 96
WIRE -64 112 -64 96
WIRE 176 128 176 112
WIRE 128 144 128 16
WIRE 160 144 128 144
WIRE 256 160 256 16
WIRE 256 160 224 160
WIRE 304 160 256 160
WIRE 160 176 48 176
WIRE 48 192 48 176
WIRE -192 208 -192 192
WIRE -64 208 -64 192
WIRE 176 208 176 192
WIRE 48 288 48 272
FLAG -64 208 0
FLAG 176 112 +V
FLAG -64 96 +V
FLAG 176 208 -V
FLAG -192 208 0
FLAG -192 96 -V
FLAG 16 16 0
FLAG 48 288 0
FLAG 48 176 IN
FLAG 304 160 OUT
SYMBOL voltage -64 96 R0
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL voltage -192 96 R0
SYMATTR InstName V2
SYMATTR Value -15
SYMBOL res 256 0 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 909
SYMBOL res 128 0 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 100
SYMBOL voltage 48 176 R0
SYMATTR InstName V3
SYMATTR Value SINE(0 .2 1K)
SYMBOL opamps\\LT1222 192 160 R0
SYMATTR InstName U1
TEXT 296 272 Left 2 !.tran 3m