Version 4
SHEET 1 2196 940
WIRE 624 -432 448 -432
WIRE 448 -416 448 -432
WIRE 448 -288 448 -336
WIRE 304 -112 -16 -112
WIRE 672 -112 592 -112
WIRE 720 -112 672 -112
WIRE 848 -112 784 -112
WIRE 1152 -112 928 -112
WIRE 304 -64 304 -112
WIRE 304 -64 144 -64
WIRE 304 -32 304 -64
WIRE 592 16 592 -112
WIRE 784 16 592 16
WIRE -16 64 -16 -112
WIRE 144 64 144 -64
WIRE 592 64 592 16
WIRE 784 64 784 16
WIRE 1152 64 1152 -112
WIRE 304 80 304 32
WIRE 352 80 304 80
WIRE 416 80 352 80
WIRE 304 112 304 80
WIRE 416 128 544 80
WIRE 544 128 416 80
WIRE 592 192 592 144
WIRE 784 192 784 128
WIRE 784 192 592 192
WIRE 304 224 304 192
WIRE 416 224 416 128
WIRE 416 224 304 224
WIRE 144 256 144 128
WIRE 304 256 304 224
WIRE 304 256 144 256
WIRE -16 304 -16 144
WIRE 304 304 304 256
WIRE 592 304 592 192
WIRE 1152 304 1152 144
FLAG 352 80 N003
FLAG 304 304 0
FLAG 592 304 0
FLAG -16 304 0
FLAG 1152 304 0
FLAG 672 -112 out
FLAG 448 -288 0
FLAG 624 -432 linear
SYMBOL res 320 96 M0
WINDOW 0 -37 35 Left 2
WINDOW 3 -25 64 Left 2
SYMATTR InstName R1
SYMATTR Value 2
SYMBOL diode 288 -32 R0
WINDOW 0 45 17 Left 2
WINDOW 3 44 46 Left 2
SYMATTR InstName D1
SYMATTR Value LD
SYMBOL cap 128 64 R0
WINDOW 0 40 21 Left 2
WINDOW 3 37 56 Left 2
SYMATTR InstName C1
SYMATTR Value 18p
SYMBOL g 592 160 M180
WINDOW 0 49 80 Left 2
WINDOW 3 49 46 Left 2
SYMATTR InstName G1
SYMATTR Value {Igain1}
SYMBOL current -16 64 R0
WINDOW 123 24 108 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName I1
SYMATTR Value PULSE(0 1m 1m 10m)
SYMATTR Value2 AC 1
SYMBOL voltage 1152 48 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 0
SYMBOL res 832 -128 M90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 1K
SYMBOL diode 768 64 R0
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL cap 784 -128 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 100n
SYMBOL voltage 448 -432 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value PULSE(0 1 1m 10m)
TEXT 96 408 Left 2 !*MOC205 as an example:\n.model LD D(Is=1e-20 Cjo=18p)\n.model NP NPN(Bf=610 Vaf=140 Ikf=15m Rc=1 Cjc=19p Cje=7p Cjs=7p C2=1e-15)\n.param Igain1=.724m
TEXT -42 -212 Left 2 !.tran 0 11m 1m
TEXT 792 -32 Left 2 ;photodiode
TEXT 368 -32 Left 2 ;LED
TEXT 432 -472 Left 2 ;perfect linear output
RECTANGLE Normal 912 224 528 -16 2