Version 4
SHEET 1 880 680
WIRE -272 240 -288 240
WIRE -272 240 -272 224
WIRE -272 256 -272 240
WIRE -128 304 -144 304
WIRE -48 176 -64 176
WIRE 64 304 32 304
WIRE 64 320 64 304
WIRE 128 128 128 32
WIRE 128 176 32 176
WIRE 128 176 128 128
WIRE 128 224 128 176
WIRE 128 304 64 304
WIRE 128 304 128 256
WIRE 128 336 128 304
WIRE 176 32 128 32
WIRE 176 224 128 224
WIRE 176 256 128 256
WIRE 192 128 128 128
WIRE 288 32 256 32
WIRE 288 128 256 128
WIRE 288 128 288 32
WIRE 288 240 240 240
WIRE 288 240 288 128
WIRE 304 240 288 240
WIRE 320 240 304 240
FLAG -288 240 0
FLAG -144 176 0
FLAG -144 304 0
FLAG 208 208 V+
FLAG -272 144 V+
FLAG 208 272 V-
FLAG -272 336 V-
FLAG 400 240 0
FLAG 64 400 0
FLAG 128 400 0
FLAG 304 240 o
SYMBOL Opamps\\LT1818 208 240 R0
SYMATTR InstName U1
SYMBOL voltage -272 128 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 6
SYMBOL voltage -272 240 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 6
SYMBOL voltage -48 176 R90
WINDOW 0 -37 99 VBottom 0
WINDOW 3 -110 14 VTop 0
WINDOW 123 0 0 Left 0
WINDOW 39 -75 24 VTop 0
SYMATTR InstName V3
SYMATTR Value PULSE(-30 30 0 10n 10n .99u 2u)
SYMATTR SpiceLine Rser=0
SYMBOL voltage -32 304 R90
WINDOW 0 -32 56 VBottom 0
WINDOW 3 72 116 VTop 0
WINDOW 123 0 0 Left 0
WINDOW 39 100 116 VTop 0
SYMATTR InstName V4
SYMATTR Value PULSE(30 -30 0 10n 10n .99u 2u)
SYMATTR SpiceLine Rser=0
SYMBOL res 48 160 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 15k
SYMATTR SpiceLine tol=0
SYMBOL res 48 288 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 15k
SYMATTR SpiceLine tol=0
SYMBOL res 272 16 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R3
SYMATTR Value 1k
SYMATTR SpiceLine tol=0
SYMBOL res 48 304 R0
SYMATTR InstName R4
SYMATTR Value 1k
SYMATTR SpiceLine tol=0
SYMBOL cap 112 336 R0
WINDOW 3 51 56 Left 0
SYMATTR InstName C1
SYMATTR Value 5p6
SYMBOL cap 256 112 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C2
SYMATTR Value 5p6
SYMBOL res 416 224 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R5
SYMATTR Value 280
TEXT 216 354 Left 0 !.tran 0 100u 0 1n