Version 4
SHEET 1 1100 920
WIRE 224 -224 224 -352
WIRE 224 -224 -96 -224
WIRE -96 -160 -96 -224
WIRE 224 -128 224 -224
WIRE -96 -48 -96 -80
WIRE 32 -48 -96 -48
WIRE 176 -48 32 -48
WIRE 32 16 32 -48
WIRE 64 16 32 16
WIRE 224 16 224 -32
WIRE 224 16 128 16
WIRE -96 32 -96 -48
WIRE 224 64 224 16
WIRE -96 144 -96 112
WIRE 32 144 -96 144
WIRE 176 144 32 144
WIRE -560 176 -560 96
WIRE 32 208 32 144
WIRE 64 208 32 208
WIRE 224 208 224 160
WIRE 224 208 128 208
WIRE -96 224 -96 144
WIRE 224 256 224 208
WIRE -560 336 -560 256
WIRE -96 336 -96 304
WIRE 32 336 -96 336
WIRE 176 336 32 336
WIRE 32 400 32 336
WIRE 64 400 32 400
WIRE 224 400 224 352
WIRE 224 400 128 400
WIRE -96 416 -96 336
WIRE 224 448 224 400
WIRE -96 528 -96 496
WIRE 32 528 -96 528
WIRE 176 528 32 528
WIRE -320 592 -560 592
WIRE -96 592 -96 528
WIRE -96 592 -128 592
WIRE 32 592 32 528
WIRE 64 592 32 592
WIRE 224 592 224 544
WIRE 224 592 128 592
WIRE -560 624 -560 592
WIRE 224 656 224 592
WIRE 224 656 -128 656
WIRE 320 656 224 656
WIRE 352 656 320 656
WIRE -320 688 -368 688
WIRE 224 720 224 656
WIRE -560 736 -560 704
WIRE -368 736 -368 688
WIRE 352 736 352 656
WIRE 224 880 224 800
WIRE 352 880 352 800
FLAG 224 880 0
FLAG -368 736 0
FLAG -560 736 0
FLAG 352 880 0
FLAG 224 -352 +HV
IOPIN 224 -352 In
FLAG -560 96 +HV
IOPIN -560 96 Out
FLAG -560 336 0
FLAG 320 656 OUT
SYMBOL nmos 176 -128 R0
SYMATTR InstName M1
SYMATTR Value STW11NM80
SYMBOL nmos 176 64 R0
SYMATTR InstName M2
SYMATTR Value STW11NM80
SYMBOL nmos 176 256 R0
SYMATTR InstName M3
SYMATTR Value STW11NM80
SYMBOL nmos 176 448 R0
SYMATTR InstName M4
SYMATTR Value STW11NM80
SYMBOL res -112 -176 R0
SYMATTR InstName R1
SYMATTR Value 10Meg
SYMBOL res -112 16 R0
SYMATTR InstName R2
SYMATTR Value 10Meg
SYMBOL res -112 208 R0
SYMATTR InstName R3
SYMATTR Value 10Meg
SYMBOL res -112 400 R0
SYMATTR InstName R4
SYMATTR Value 10Meg
SYMBOL zener 128 0 R90
WINDOW 0 -4 32 VBottom 2
WINDOW 3 36 32 VTop 2
SYMATTR InstName D1
SYMATTR Value BZX84C10VL
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL zener 128 192 R90
WINDOW 0 -4 32 VBottom 2
WINDOW 3 36 32 VTop 2
SYMATTR InstName D2
SYMATTR Value BZX84C10VL
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL zener 128 384 R90
WINDOW 0 -4 32 VBottom 2
WINDOW 3 36 32 VTop 2
SYMATTR InstName D3
SYMATTR Value BZX84C10VL
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL zener 128 576 R90
WINDOW 0 -4 32 VBottom 2
WINDOW 3 36 32 VTop 2
SYMATTR InstName D4
SYMATTR Value BZX84C10VL
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL Optos\\4N27 -224 656 R0
SYMATTR InstName U1
SYMBOL current -560 704 R180
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName I1
SYMATTR Value PULSE(0 30m 0 100n 100n 50m 100M)
SYMBOL res 208 704 R0
SYMATTR InstName R5
SYMATTR Value 1Meg
SYMBOL cap 336 736 R0
SYMATTR InstName C1
SYMATTR Value 10p
SYMBOL voltage -560 160 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 2k
TEXT -1034 464 Left 2 !.tran 0 500m 0 startup