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