Version 4
SHEET 1 1556 680
WIRE 160 -16 160 -48
WIRE 1136 0 1136 -32
WIRE 208 96 32 96
WIRE 368 96 288 96
WIRE 480 96 368 96
WIRE 1456 112 1008 112
WIRE 160 128 160 64
WIRE -224 144 -384 144
WIRE -128 144 -224 144
WIRE 32 144 32 96
WIRE 32 144 -48 144
WIRE 128 144 32 144
WIRE 1136 144 1136 80
WIRE 480 160 480 96
WIRE 480 160 192 160
WIRE 752 160 592 160
WIRE 1008 160 1008 112
WIRE 1008 160 752 160
WIRE 1104 160 1008 160
WIRE 128 176 32 176
WIRE 1296 176 1168 176
WIRE 1344 176 1296 176
WIRE -384 192 -384 144
WIRE 1104 192 1008 192
WIRE 32 208 32 176
WIRE 592 208 592 160
WIRE 1344 208 1344 176
WIRE 1008 224 1008 192
WIRE 160 256 160 192
WIRE 1136 272 1136 208
WIRE -384 304 -384 272
WIRE 592 320 592 288
WIRE 1344 320 1344 288
WIRE 1456 320 1456 112
WIRE 1456 320 1344 320
WIRE 1344 336 1344 320
WIRE 160 368 160 336
WIRE 1136 384 1136 352
WIRE 1344 464 1344 416
FLAG 160 368 0
FLAG 160 -48 0
FLAG -384 304 0
FLAG -224 144 in
FLAG 368 96 out
FLAG 32 208 0
FLAG 1136 384 0
FLAG 1136 -32 0
FLAG 592 320 0
FLAG 752 160 in1
FLAG 1296 176 out1
FLAG 1008 224 0
FLAG 1344 464 0
SYMBOL Opamps\\LT1677 160 96 R0
SYMATTR InstName U1
SYMBOL voltage 160 80 R180
WINDOW 0 24 96 Left 2
WINDOW 3 24 16 Left 2
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL voltage 160 352 R180
WINDOW 0 24 96 Left 2
WINDOW 3 24 16 Left 2
SYMATTR InstName V2
SYMATTR Value 10
SYMBOL res 192 112 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL voltage -384 176 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value PULSE(0 10 1m 1p 1p 5m 10m)
SYMBOL res -144 160 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL Opamps\\LT1677 1136 112 R0
SYMATTR InstName U2
SYMBOL voltage 1136 96 R180
WINDOW 0 24 96 Left 2
WINDOW 3 24 16 Left 2
SYMATTR InstName V4
SYMATTR Value 10
SYMBOL voltage 1136 368 R180
WINDOW 0 24 96 Left 2
WINDOW 3 24 16 Left 2
SYMATTR InstName V5
SYMATTR Value 10
SYMBOL res 1328 192 R0
SYMATTR InstName R2
SYMATTR Value 10
SYMBOL voltage 592 192 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V6
SYMATTR Value PULSE(0 10 1m 1p 1p 5m 10m)
SYMBOL res 1328 320 R0
SYMATTR InstName R5
SYMATTR Value 10k
TEXT -384 16 Left 2 !.tran 20m