Version 4
SHEET 1 1420 720
WIRE 576 -16 512 -16
WIRE 688 -16 640 -16
WIRE 1248 64 1232 64
WIRE 1360 64 1328 64
WIRE 512 112 512 -16
WIRE 512 112 272 112
WIRE 560 112 512 112
WIRE 688 112 688 -16
WIRE 688 112 656 112
WIRE 816 112 688 112
WIRE 912 112 896 112
WIRE 976 112 912 112
WIRE 1232 112 1232 64
WIRE 1232 112 1168 112
WIRE 1360 112 1360 64
WIRE 512 144 512 112
WIRE 976 208 944 208
WIRE 1200 208 1168 208
WIRE 512 240 512 224
WIRE 608 240 608 176
WIRE 608 240 512 240
WIRE 608 272 608 240
WIRE 944 288 944 208
WIRE 944 288 832 288
WIRE 944 304 944 288
WIRE 976 304 944 304
WIRE 1232 304 1232 112
WIRE 1232 304 1168 304
WIRE 272 352 272 112
WIRE 912 400 912 112
WIRE 976 400 912 400
WIRE 1200 400 1200 208
WIRE 1200 400 1168 400
WIRE 1360 400 1360 192
WIRE 608 432 608 400
WIRE 608 432 512 432
WIRE 512 448 512 432
WIRE 608 496 608 432
WIRE 272 560 272 432
WIRE 512 560 512 528
WIRE 512 560 272 560
WIRE 560 560 512 560
WIRE 704 560 656 560
WIRE 832 560 832 288
WIRE 832 560 704 560
WIRE 1200 576 1200 400
WIRE 272 656 272 560
WIRE 512 672 512 560
WIRE 560 672 512 672
WIRE 704 672 704 560
WIRE 704 672 624 672
FLAG 1200 576 0
FLAG 1360 400 0
FLAG 272 656 0
SYMBOL zener 624 336 R180
WINDOW 0 24 72 Left 2
WINDOW 3 -154 45 Left 2
SYMATTR InstName D7
SYMATTR Value BZX84C6V2L
SYMBOL res 912 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 800
SYMBOL voltage 1360 96 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL res 1344 48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R6
SYMATTR Value 1k
SYMBOL Optos\\PC817A 1072 160 R0
SYMATTR InstName U1
SYMBOL npn 560 176 R270
SYMATTR InstName Q1
SYMATTR Value 2N5550
SYMBOL res 496 128 R0
SYMATTR InstName R1
SYMATTR Value 300k
SYMBOL zener 624 336 M0
WINDOW 3 -157 43 Left 2
SYMATTR InstName D5
SYMATTR Value BZX84C6V2L
SYMBOL npn 560 496 M90
SYMATTR InstName Q2
SYMATTR Value 2N5550
SYMBOL res 496 544 M180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R2
SYMATTR Value 300k
SYMBOL Optos\\PC817A 1072 352 R0
SYMATTR InstName U2
SYMBOL diode 640 -32 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D1
SYMATTR Value UPSC600
SYMBOL diode 624 656 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D2
SYMATTR Value UPSC600
SYMBOL voltage 272 336 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value SINE(0 565 50)
TEXT -96 424 Left 2 !.tran 40m