Version 4
SHEET 1 1196 680
WIRE 112 32 80 32
WIRE 208 32 176 32
WIRE 144 128 144 112
WIRE -32 144 -64 144
WIRE 80 144 80 32
WIRE 80 144 48 144
WIRE 112 144 80 144
WIRE 208 160 208 32
WIRE 208 160 176 160
WIRE 240 160 208 160
WIRE 352 160 320 160
WIRE 384 160 352 160
WIRE 512 160 464 160
WIRE -64 176 -64 144
WIRE 112 176 80 176
WIRE 672 176 640 176
WIRE 784 176 752 176
WIRE 960 192 928 192
WIRE 1072 192 1040 192
WIRE -176 208 -176 176
WIRE 80 208 80 176
WIRE 144 208 144 192
WIRE 448 240 448 224
WIRE 352 256 352 160
WIRE 416 256 352 256
WIRE 720 256 720 240
WIRE 512 272 512 160
WIRE 512 272 480 272
WIRE 544 272 512 272
WIRE 640 272 640 176
WIRE 640 272 608 272
WIRE 688 272 640 272
WIRE 1008 272 1008 256
WIRE -64 288 -64 256
WIRE 112 288 80 288
WIRE 208 288 176 288
WIRE 416 288 384 288
WIRE 784 288 784 176
WIRE 784 288 752 288
WIRE 816 288 784 288
WIRE 928 288 928 192
WIRE 928 288 896 288
WIRE 976 288 928 288
WIRE 688 304 656 304
WIRE 1072 304 1072 192
WIRE 1072 304 1040 304
WIRE 1120 304 1072 304
WIRE 384 320 384 288
WIRE 448 320 448 304
WIRE 976 320 944 320
WIRE -176 336 -176 288
WIRE -112 336 -176 336
WIRE 656 336 656 304
WIRE 720 336 720 320
WIRE 944 352 944 320
WIRE 1008 352 1008 336
WIRE -112 368 -112 336
WIRE -176 384 -176 336
WIRE 144 384 144 368
WIRE -32 400 -64 400
WIRE 80 400 80 288
WIRE 80 400 48 400
WIRE 112 400 80 400
WIRE 208 416 208 288
WIRE 208 416 176 416
WIRE 240 416 208 416
WIRE 352 416 352 256
WIRE 352 416 320 416
WIRE -64 432 -64 400
WIRE 112 432 80 432
WIRE 80 464 80 432
WIRE 144 464 144 448
WIRE -176 496 -176 464
WIRE -64 544 -64 512
FLAG 144 208 V-
FLAG 144 112 V+
FLAG 144 464 V-
FLAG 144 368 V+
FLAG 448 320 V-
FLAG 448 224 V+
FLAG 720 336 V-
FLAG 720 240 V+
FLAG 1008 352 V-
FLAG 1008 256 V+
FLAG 384 320 0
FLAG 656 336 0
FLAG 944 352 0
FLAG -112 368 0
FLAG 1120 304 OUT
FLAG -176 176 V+
FLAG -176 496 V-
FLAG -64 544 0
FLAG -64 288 0
FLAG 80 208 0
FLAG 80 464 0
FLAG -64 400 IN
SYMBOL Opamps\\LT1013 144 96 R0
SYMATTR InstName U1
SYMBOL res 64 128 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL diode 176 48 M270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL Opamps\\LT1013 144 352 R0
SYMATTR InstName U2
SYMBOL res 64 384 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 10k
SYMBOL diode 112 304 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL res 336 144 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL res 336 400 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 5k
SYMBOL Opamps\\LT1013 448 208 R0
SYMATTR InstName U3
SYMBOL Opamps\\LT1013 720 224 R0
SYMATTR InstName U4
SYMBOL Opamps\\LT1013 1008 240 R0
SYMATTR InstName U5
SYMBOL res 480 144 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL res 768 160 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 10k
SYMBOL res 1056 176 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL res 912 272 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 10k
SYMBOL diode 544 288 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D3
SYMATTR Value 1N4148
SYMBOL voltage -176 192 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL voltage -176 368 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 10
SYMBOL voltage -64 160 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value -1
SYMBOL voltage -64 416 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V4
SYMATTR Value 1
TEXT 592 32 Left 2 !.dc V4 0 3 1m