Version 4
SHEET 1 1372 680
WIRE 1120 -336 928 -336
WIRE 1024 -304 976 -304
WIRE 144 -256 64 -256
WIRE 752 -224 704 -224
WIRE 64 -208 64 -256
WIRE 928 -208 928 -336
WIRE 1024 -208 1024 -224
WIRE 1120 -208 1120 -336
WIRE 1120 -208 1024 -208
WIRE 976 -192 976 -304
WIRE 976 -192 960 -192
WIRE 1120 -192 1120 -208
WIRE 896 -176 816 -176
WIRE 1024 -160 960 -160
WIRE 928 -128 928 -144
WIRE 928 -128 752 -128
WIRE 1152 -128 928 -128
WIRE 64 -112 64 -128
WIRE 1152 -96 1152 -128
WIRE 320 -80 -240 -80
WIRE 528 -80 320 -80
WIRE 704 -80 704 -224
WIRE 704 -80 528 -80
WIRE 16 -64 -160 -64
WIRE 144 -64 144 -256
WIRE -400 -48 -432 -48
WIRE -288 -48 -336 -48
WIRE 16 -32 16 -64
WIRE 528 16 528 -80
WIRE 704 16 704 -80
WIRE 912 16 704 16
WIRE 1024 16 1024 -160
WIRE 1024 16 992 16
WIRE 320 32 320 -80
WIRE 144 48 144 16
WIRE 288 48 144 48
WIRE -432 64 -432 -48
WIRE -432 64 -688 64
WIRE -400 64 -432 64
WIRE -288 64 -288 -48
WIRE -288 64 -320 64
WIRE 464 64 352 64
WIRE 16 80 16 48
WIRE 288 80 16 80
WIRE 1152 96 1152 -32
WIRE -512 112 -560 112
WIRE 16 128 16 80
WIRE 144 128 144 48
WIRE 1024 128 1024 96
WIRE 528 144 528 112
WIRE -240 160 -240 -80
WIRE -240 160 -368 160
WIRE -864 208 -992 208
WIRE -768 208 -864 208
WIRE -688 208 -688 64
WIRE -688 208 -768 208
WIRE -368 208 -368 160
WIRE -432 224 -432 64
WIRE -400 224 -432 224
WIRE -992 240 -992 208
WIRE -864 240 -864 208
WIRE -768 240 -768 208
WIRE -288 240 -288 64
WIRE -288 240 -336 240
WIRE -160 240 -160 -64
WIRE -160 240 -288 240
WIRE 144 240 144 208
WIRE 320 240 320 96
WIRE 320 240 144 240
WIRE 528 240 528 224
WIRE 528 240 320 240
WIRE 608 240 528 240
WIRE -512 256 -512 192
WIRE -400 256 -512 256
WIRE 144 272 144 240
WIRE 608 272 608 240
WIRE -560 288 -560 112
WIRE -560 288 -608 288
WIRE -512 304 -512 256
WIRE -688 320 -688 272
WIRE -608 320 -608 288
WIRE -992 336 -992 320
WIRE -864 336 -864 304
WIRE -864 336 -992 336
WIRE -768 336 -768 320
WIRE -768 336 -864 336
WIRE 16 352 16 208
WIRE 608 352 16 352
WIRE 1152 352 1152 176
WIRE 1152 352 608 352
WIRE -864 400 -864 336
WIRE -608 416 -608 400
WIRE -512 416 -512 384
WIRE -368 416 -368 272
FLAG 144 272 0
FLAG -864 400 0
FLAG -688 320 0
FLAG -160 240 OUT
FLAG 1024 128 0
FLAG -512 416 0
FLAG 1120 -192 0
FLAG 64 -112 0
FLAG -608 416 0
FLAG -368 416 0
SYMBOL res 0 -48 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 0 112 R0
SYMATTR InstName R2
SYMATTR Value 14k8
SYMBOL res 128 -80 R0
SYMATTR InstName R3
SYMATTR Value 9k
SYMBOL npn 464 16 R0
SYMATTR InstName Q1
SYMATTR Value FZT849
SYMBOL res 512 128 R0
SYMATTR InstName R5
SYMATTR Value 100
SYMBOL res 592 256 R0
SYMATTR InstName R_Mess
SYMATTR Value 100
SYMBOL voltage 1152 80 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 12
SYMBOL res 128 112 R0
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL res -784 224 R0
SYMATTR InstName R6
SYMATTR Value 1G
SYMBOL diode -848 304 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value D_Photo
SYMBOL current -992 240 R0
WINDOW 3 -49 288 Left 2
WINDOW 123 -47 317 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value PULSE(0 100u 10u 100n 100n 100u 200u)
SYMATTR Value2 AC 1
SYMATTR InstName I1
SYMBOL cap -704 208 R0
SYMATTR InstName C_Cable1
SYMATTR Value 100p
SYMBOL cap -336 -64 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 47p
SYMBOL res -304 48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL Opamps\\LTC6241 -368 240 R0
SYMATTR InstName U3
SYMBOL res 1008 0 R0
SYMATTR InstName R8
SYMATTR Value 3k
SYMBOL res 1008 0 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R9
SYMATTR Value 10k
SYMBOL npn 816 -128 R180
SYMATTR InstName Q2
SYMBOL voltage 1024 -320 R0
WINDOW 0 24 96 Left 2
WINDOW 3 24 16 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V5
SYMATTR Value 5
SYMBOL diode 1168 -32 R180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D3
SYMBOL res -528 96 R0
SYMATTR InstName R10
SYMATTR Value 11k
SYMBOL res -528 288 R0
SYMATTR InstName R11
SYMATTR Value 2k9
SYMBOL voltage 64 -224 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL voltage -608 304 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value 5
SYMBOL Opamps\\LT1800 320 0 R0
SYMATTR InstName U1
SYMBOL Opamps\\LT1800 928 -112 R180
SYMATTR InstName U5
TEXT -1040 592 Left 2 !.model D_Photo D(Is=1e-10 Cjo=70p Rs=5 N=1.5)
TEXT -1040 480 Left 2 !.tran 0 1m 0 1u