Version 4
SHEET 1 896 792
WIRE 32 16 -48 16
WIRE 256 16 112 16
WIRE 448 16 368 16
WIRE 672 16 528 16
WIRE -144 96 -208 96
WIRE -48 96 -48 16
WIRE -48 96 -64 96
WIRE -32 96 -48 96
WIRE 64 96 48 96
WIRE 144 96 64 96
WIRE 256 96 256 16
WIRE 256 96 208 96
WIRE 272 96 256 96
WIRE 368 96 368 16
WIRE 368 96 352 96
WIRE 384 96 368 96
WIRE 480 96 464 96
WIRE 512 96 480 96
WIRE 672 96 672 16
WIRE 672 96 576 96
WIRE 704 96 672 96
WIRE -208 112 -208 96
WIRE -48 144 -48 96
WIRE 368 144 368 96
WIRE 128 192 128 176
WIRE 544 192 544 176
WIRE -208 208 -208 192
WIRE -48 224 -48 208
WIRE 64 224 64 96
WIRE 96 224 64 224
WIRE 368 224 368 208
WIRE 480 240 480 96
WIRE 512 240 480 240
WIRE 256 272 256 96
WIRE 256 272 240 272
WIRE 672 272 672 96
WIRE 672 272 656 272
WIRE 96 304 64 304
WIRE 512 304 480 304
WIRE -176 336 -176 320
WIRE -48 336 -48 320
WIRE 128 368 128 352
WIRE 544 368 544 352
WIRE -176 432 -176 416
WIRE -48 432 -48 416
FLAG -48 432 0
FLAG 128 176 +V
FLAG -48 320 +V
FLAG 128 368 -V
FLAG -176 432 0
FLAG -176 320 -V
FLAG -48 224 0
FLAG 64 304 0
FLAG 544 176 +V
FLAG 544 368 -V
FLAG 368 224 0
FLAG 480 304 0
FLAG -208 96 IN
FLAG 704 96 OUT
FLAG -208 208 0
SYMBOL voltage -48 320 R0
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL voltage -176 320 R0
SYMATTR InstName V2
SYMATTR Value -5
SYMBOL opamps\\LT1812 128 272 R0
SYMATTR InstName U1
SYMBOL cap 208 80 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 47p
SYMBOL res 64 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 665
SYMBOL res -48 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 232
SYMBOL res 128 0 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 232
SYMBOL cap -64 144 R0
SYMATTR InstName C2
SYMATTR Value 220p
SYMBOL opamps\\LT1812 544 272 R0
SYMATTR InstName U2
SYMBOL cap 576 80 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 22p
SYMBOL res 480 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 665
SYMBOL res 368 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 274
SYMBOL res 544 0 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 274
SYMBOL cap 352 144 R0
SYMATTR InstName C4
SYMATTR Value 470p
SYMBOL voltage -208 96 R0
SYMATTR InstName V3
SYMATTR Value AC 1
TEXT 408 432 Left 2 !.ac oct 10 100K 100Meg
TEXT 304 -40 Bottom 2 ;4MHz, 4th Order Butterworth Filter