Version 4
SHEET 1 880 680
WIRE 288 -96 -176 -96
WIRE -32 -32 -80 -32
WIRE 64 -32 48 -32
WIRE 192 -16 176 -16
WIRE 288 -16 288 -96
WIRE 288 -16 256 -16
WIRE -304 48 -352 48
WIRE 0 48 -224 48
WIRE 224 48 0 48
WIRE 416 48 224 48
WIRE 0 96 0 48
WIRE 224 96 224 48
WIRE 416 96 416 48
WIRE -32 112 -64 112
WIRE 176 112 176 -16
WIRE 192 112 176 112
WIRE 384 112 352 112
WIRE 64 128 64 -32
WIRE 64 128 32 128
WIRE 80 128 64 128
WIRE 176 128 176 112
WIRE 176 128 160 128
WIRE 288 128 288 -16
WIRE 288 128 256 128
WIRE 336 128 288 128
WIRE 592 128 448 128
WIRE -176 144 -176 -96
WIRE -160 144 -176 144
WIRE -80 144 -80 -32
WIRE -32 144 -80 144
WIRE 192 144 160 144
WIRE 336 144 336 128
WIRE 384 144 336 144
WIRE 160 208 160 144
WIRE -304 272 -352 272
WIRE 0 272 0 160
WIRE 0 272 -224 272
WIRE 224 272 224 160
WIRE 224 272 0 272
WIRE 416 272 416 160
WIRE 416 272 224 272
WIRE -64 288 -64 112
WIRE 352 288 352 112
WIRE -64 400 -64 368
WIRE 352 400 352 368
FLAG -352 48 0
FLAG -352 272 0
FLAG -64 400 0
FLAG 160 208 0
FLAG 592 208 0
FLAG 352 400 0
SYMBOL res 64 -48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 176 112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL res -64 128 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL voltage -208 48 R90
WINDOW 0 -32 56 VBottom 2
WINDOW 3 32 56 VTop 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 5
SYMBOL voltage -320 272 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 -32 56 VBottom 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL voltage -64 272 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value 0
SYMBOL cap 256 -32 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 1µ
SYMBOL res 576 112 R0
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL Opamps\\LT1797 0 64 R0
SYMATTR InstName U1
SYMBOL Opamps\\LT1797 224 64 R0
SYMATTR InstName U2
SYMBOL Opamps\\LT1797 416 64 R0
SYMATTR InstName U3
SYMBOL voltage 352 272 R0
SYMATTR InstName V4
SYMATTR Value {Vadj}
TEXT -372 424 Left 2 !.tran 10ms
TEXT 32 424 Left 2 !.step param Vadj 0 .1 0.02