Version 4
SHEET 1 948 680
WIRE -32 -16 -320 -16
WIRE 64 -16 -32 -16
WIRE 160 -16 64 -16
WIRE 608 -16 160 -16
WIRE 704 -16 608 -16
WIRE 608 0 608 -16
WIRE -144 16 -368 16
WIRE -112 16 -144 16
WIRE -32 16 -32 -16
WIRE 64 16 64 -16
WIRE -144 32 -144 16
WIRE -448 96 -448 16
WIRE -320 96 -320 -16
WIRE 704 112 704 -16
WIRE 160 128 160 -16
WIRE 608 128 608 80
WIRE 672 128 608 128
WIRE -112 144 -112 16
WIRE 48 144 -48 144
WIRE 128 144 96 144
WIRE 752 144 736 144
WIRE 800 144 752 144
WIRE 240 160 192 160
WIRE 256 160 240 160
WIRE 352 160 320 160
WIRE 400 160 352 160
WIRE 512 160 400 160
WIRE 656 160 592 160
WIRE 672 160 656 160
WIRE 48 176 48 144
WIRE 64 176 64 96
WIRE 64 176 48 176
WIRE 128 176 64 176
WIRE 608 176 608 128
WIRE 352 208 352 160
WIRE 400 208 400 160
WIRE 656 208 656 160
WIRE 672 208 656 208
WIRE 752 208 752 144
WIRE -448 240 -448 176
WIRE -240 240 -448 240
WIRE -144 240 -144 112
WIRE -144 240 -240 240
WIRE -112 240 -144 240
WIRE -32 240 -32 96
WIRE -32 240 -48 240
WIRE 800 240 800 224
WIRE 944 240 800 240
WIRE 64 256 64 176
WIRE 96 256 96 144
WIRE 240 256 240 240
WIRE 240 256 96 256
WIRE -320 336 -320 176
WIRE -240 336 -240 320
WIRE -240 336 -320 336
WIRE -32 336 -32 320
WIRE -32 336 -240 336
WIRE 64 336 -32 336
WIRE 112 336 64 336
WIRE 160 336 160 192
WIRE 160 336 112 336
WIRE 240 336 160 336
WIRE 352 336 352 272
WIRE 352 336 240 336
WIRE 400 336 400 288
WIRE 400 336 352 336
WIRE 608 336 608 256
WIRE 608 336 400 336
WIRE 704 336 704 176
WIRE 704 336 608 336
WIRE 800 336 800 320
WIRE 800 336 704 336
WIRE 112 352 112 336
FLAG 112 352 0
SYMBOL Opamps\\LT1001 160 96 R0
SYMATTR InstName U1
SYMBOL voltage -320 80 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL voltage -448 80 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 124 Left 2
SYMATTR SpiceLine Rser=0.1
SYMATTR InstName V2
SYMATTR Value SINE(0 7 9k)
SYMBOL cap -48 128 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 100n
SYMBOL cap -48 224 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 100n
SYMBOL res -352 0 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value {Rvar}
SYMBOL res 784 128 R0
SYMATTR InstName R9
SYMATTR Value 7k
SYMBOL res 784 224 R0
SYMATTR InstName R10
SYMATTR Value 5k
SYMBOL res -160 16 R0
SYMATTR InstName R11
SYMATTR Value 0.5
SYMBOL Opamps\\LT1001 704 80 R0
SYMATTR InstName U2
SYMBOL res 592 -16 R0
SYMATTR InstName R12
SYMATTR Value 10k
SYMBOL res 592 160 R0
SYMATTR InstName R13
SYMATTR Value 1k
SYMBOL res 608 144 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R14
SYMATTR Value 10k
SYMBOL res 768 192 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R15
SYMATTR Value 10k
SYMBOL res -256 224 R0
WINDOW 3 -78 136 Left 2
SYMATTR InstName R1
SYMATTR Value 100000k
SYMBOL res 224 144 R0
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL res 224 240 R0
SYMATTR InstName R5
SYMATTR Value 1k
SYMBOL res -48 0 R0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL res -48 224 R0
SYMATTR InstName R6
SYMATTR Value 300
SYMBOL cap 336 208 R0
SYMATTR InstName C3
SYMATTR Value 100n
SYMBOL res 384 192 R0
SYMATTR InstName R7
SYMATTR Value 100k
SYMBOL diode 256 176 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL res 48 0 R0
SYMATTR InstName R8
SYMATTR Value 1k
SYMBOL res 48 240 R0
SYMATTR InstName R16
SYMATTR Value 300
TEXT -624 392 Left 2 !.tran 0.2
TEXT -560 -96 Left 2 !.step param Rvar 100 5k 500