Version 4
SHEET 1 1028 680
WIRE 928 -160 832 -160
WIRE 784 -64 768 -64
WIRE 800 -64 784 -64
WIRE 832 -64 832 -160
WIRE 848 -64 832 -64
WIRE 928 -48 928 -160
WIRE 928 -48 912 -48
WIRE 688 -32 688 -64
WIRE 784 -32 784 -64
WIRE 800 -32 800 -64
WIRE 848 -32 800 -32
WIRE 304 32 272 32
WIRE 624 32 608 32
WIRE 896 128 784 128
WIRE 96 144 80 144
WIRE 176 144 176 64
WIRE 192 144 192 32
WIRE 192 144 176 144
WIRE 208 144 192 144
WIRE 304 144 304 32
WIRE 400 144 304 144
WIRE 512 144 480 144
WIRE 528 144 528 32
WIRE 528 144 512 144
WIRE 544 144 528 144
WIRE 304 160 304 144
WIRE 304 160 272 160
WIRE 624 160 624 32
WIRE 624 160 608 160
WIRE 208 176 192 176
WIRE 544 176 496 176
WIRE 784 176 784 128
WIRE 80 192 80 144
WIRE 192 192 192 176
WIRE 512 208 512 144
WIRE 512 208 496 208
WIRE 496 224 496 208
FLAG -192 208 0
FLAG -192 352 0
FLAG -80 352 0
FLAG -192 128 +5V
FLAG 240 128 +5V
FLAG -192 272 -12V
FLAG -80 272 +12V
FLAG 240 192 0
FLAG 80 272 0
FLAG -80 208 0
FLAG -80 128 -10V
FLAG 96 64 -10V
FLAG 192 192 0
FLAG 576 192 -12V
FLAG 576 128 +12V
FLAG 416 224 -10V
FLAG 496 176 0
FLAG 784 256 0
FLAG 880 -16 0
FLAG 880 -80 +5V
FLAG 832 0 0
FLAG 688 48 0
FLAG 784 48 0
SYMBOL voltage -80 256 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL voltage -192 256 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value -12
SYMBOL voltage -192 112 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value 5
SYMBOL voltage 80 176 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value SINE(0 10 20)
SYMBOL res 192 128 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 100k
SYMBOL res 288 16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 24k
SYMBOL res 192 48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 100k
SYMBOL voltage -80 112 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V5
SYMATTR Value -10
SYMBOL Opamps\\LT1677 240 96 R0
SYMATTR InstName U1
SYMBOL TL072 576 96 R0
SYMATTR InstName U2
SYMBOL res 496 128 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 24k
SYMBOL res 624 16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 100k
SYMBOL res 512 208 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 100k
SYMBOL voltage 784 160 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V6
SYMATTR Value SINE(0 5 20)
SYMBOL Opamps\\LT1677 880 -112 R0
SYMATTR InstName U3
SYMBOL voltage 688 -48 R0
WINDOW 3 23 87 Left 2
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V7
SYMATTR Value SINE(0 10 20)
SYMBOL res 784 -80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 100k
SYMBOL res 800 64 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R8
SYMATTR Value 100k
TEXT -98 212 Left 2 !.tran 1