Version 4
SHEET 1 880 680
WIRE -112 144 -160 144
WIRE 0 144 -32 144
WIRE 96 144 80 144
WIRE 112 144 96 144
WIRE 320 144 176 144
WIRE -160 176 -160 144
WIRE 96 176 96 144
WIRE 240 224 240 208
WIRE 176 240 176 144
WIRE 208 240 176 240
WIRE 320 256 320 144
WIRE 320 256 272 256
WIRE 432 256 400 256
WIRE 448 256 432 256
WIRE 656 256 512 256
WIRE 96 272 96 256
WIRE 208 272 96 272
WIRE 96 288 96 272
WIRE 432 288 432 256
WIRE 576 336 576 320
WIRE 240 352 240 288
WIRE 512 352 512 256
WIRE 544 352 512 352
WIRE -368 368 -368 336
WIRE -272 368 -272 336
WIRE 656 368 656 256
WIRE 656 368 608 368
WIRE 432 384 432 368
WIRE 544 384 432 384
WIRE -368 464 -368 448
WIRE -272 464 -272 448
WIRE 576 464 576 400
FLAG 96 336 0
FLAG -368 336 -V
FLAG -272 336 +V
FLAG -272 464 0
FLAG -368 464 0
FLAG 240 352 -V
FLAG 240 208 +V
FLAG -160 176 0
FLAG 432 448 0
FLAG 576 464 -V
FLAG 576 320 +V
SYMBOL res 96 128 R90
WINDOW 0 0 56 VBottom 1
WINDOW 3 32 56 VTop 1
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL OpAmps\\OP27 240 192 R0
SYMATTR InstName U2
SYMBOL cap 176 128 R90
WINDOW 0 41 17 VBottom 1
WINDOW 3 -17 13 VTop 1
SYMATTR InstName C1
SYMATTR Value 172n
SYMBOL cap 80 272 R0
WINDOW 0 24 8 Left 1
WINDOW 3 24 56 Left 1
SYMATTR InstName C2
SYMATTR Value 147n
SYMBOL res 80 160 R0
WINDOW 0 36 40 Left 1
WINDOW 3 36 76 Left 1
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL voltage -272 352 R0
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL voltage -368 352 R0
SYMATTR InstName V2
SYMATTR Value -10
SYMBOL voltage -16 144 R90
WINDOW 0 -8 8 VBottom 2
WINDOW 3 34 265 VTop 2
WINDOW 123 38 52 VTop 2
WINDOW 39 0 0 Left 0
SYMATTR InstName Vin
SYMATTR Value SINE(0 1 10k)
SYMATTR Value2 AC 1 0
SYMBOL OpAmps\\OP27 576 304 R0
SYMATTR InstName U1
SYMBOL cap 512 240 R90
WINDOW 0 41 17 VBottom 1
WINDOW 3 -17 13 VTop 1
SYMATTR InstName C3
SYMATTR Value 416n
SYMBOL cap 416 384 R0
WINDOW 0 24 8 Left 1
WINDOW 3 24 56 Left 1
SYMATTR InstName C4
SYMATTR Value 61n
SYMBOL res 416 240 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL res 416 272 R0
SYMATTR InstName R4
SYMATTR Value 1k
TEXT -8 432 Left 2 !.ac dec 20 10 10k