Version 4
SHEET 1 2772 680
WIRE 432 -128 288 -128
WIRE 560 -128 512 -128
WIRE 448 0 416 0
WIRE 560 0 560 -128
WIRE 560 0 512 0
WIRE 192 128 112 128
WIRE 288 128 288 -128
WIRE 288 128 272 128
WIRE 304 128 288 128
WIRE 416 128 416 0
WIRE 416 128 384 128
WIRE 448 128 416 128
WIRE 560 144 560 0
WIRE 560 144 512 144
WIRE 640 144 560 144
WIRE 288 160 288 128
WIRE 448 160 416 160
WIRE 416 224 416 160
WIRE 112 240 112 208
FLAG 112 240 0
FLAG 416 224 0
FLAG 128 32 0
FLAG 224 -80 0
FLAG 128 -48 vc
IOPIN 128 -48 BiDir
FLAG 480 112 vc
IOPIN 480 112 BiDir
FLAG 224 0 vd
IOPIN 224 0 BiDir
FLAG 480 176 vd
IOPIN 480 176 BiDir
FLAG 640 144 out
IOPIN 640 144 BiDir
FLAG 288 224 0
SYMBOL voltage 112 112 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
WINDOW 0 43 64 Left 2
SYMATTR Value2 AC 1
SYMATTR InstName V1
SYMATTR Value SINE(0 1)
SYMBOL Opamps\\LT1028 480 80 R0
SYMATTR InstName U1
SYMBOL voltage 128 -64 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 15
SYMBOL voltage 224 -96 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value 15
SYMBOL res 400 112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 7.5k
SYMBOL res 288 112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 5.6k
SYMBOL cap 272 160 R0
SYMATTR InstName C1
SYMATTR Value 1000p
SYMBOL cap 512 -16 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 100p
SYMBOL res 528 -144 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 5.6k
TEXT 112 -152 Left 2 !.ac oct 10 10 1Meg