Version 4
SHEET 1 1420 708
WIRE 144 112 48 112
WIRE 240 112 144 112
WIRE 256 112 240 112
WIRE 352 112 336 112
WIRE 448 112 432 112
WIRE 544 112 512 112
WIRE 624 112 544 112
WIRE 720 112 624 112
WIRE 768 112 720 112
WIRE 928 112 848 112
WIRE 1360 112 1120 112
WIRE 624 128 624 112
WIRE 720 144 720 112
WIRE 48 160 48 112
WIRE 144 160 144 112
WIRE 1200 176 1120 176
WIRE 928 208 848 208
WIRE 240 224 240 112
WIRE 368 224 240 224
WIRE 624 224 624 208
WIRE 624 224 432 224
WIRE 48 240 48 224
WIRE 48 240 -208 240
WIRE -208 256 -208 240
WIRE 240 256 240 224
WIRE 720 256 720 224
WIRE 784 256 720 256
WIRE 1200 272 1200 176
WIRE 720 288 720 256
WIRE 624 336 624 224
WIRE 656 336 624 336
WIRE -208 352 -208 336
WIRE 144 352 144 224
WIRE 144 352 -208 352
WIRE 544 352 544 112
WIRE 544 352 496 352
WIRE 48 368 48 240
WIRE 144 368 144 352
WIRE 240 368 240 336
WIRE 496 384 496 352
WIRE 544 384 544 352
WIRE 1200 400 1200 352
WIRE 1360 400 1360 192
WIRE 48 480 48 432
WIRE 144 480 144 432
WIRE 240 480 240 448
WIRE 496 480 496 448
WIRE 544 480 544 448
WIRE 720 480 720 384
WIRE 848 480 848 304
FLAG 48 480 0
FLAG 144 480 0
FLAG 240 480 0
FLAG 496 480 0
FLAG 544 480 0
FLAG 720 480 0
FLAG 848 480 0
FLAG 1200 400 0
FLAG 1360 400 0
SYMBOL diode 64 224 R180
WINDOW 0 24 72 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D1
SYMATTR Value 1N4007
SYMBOL diode 160 224 R180
WINDOW 0 24 72 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value 1N4007
SYMBOL diode 64 432 R180
WINDOW 0 24 72 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D3
SYMATTR Value 1N4007
SYMBOL diode 160 432 R180
WINDOW 0 24 72 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D4
SYMATTR Value 1N4007
SYMBOL voltage -208 240 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value SINE(0 310 50)
SYMBOL res 224 240 R0
SYMATTR InstName R1
SYMATTR Value {Rlast}
SYMBOL diode 448 128 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
SYMATTR InstName D5
SYMATTR Value 1N4007
SYMBOL diode 432 208 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName D6
SYMATTR Value 1N4007
SYMBOL cap 528 384 R0
SYMATTR InstName C1
SYMATTR Value 470n
SYMBOL zener 512 448 R180
WINDOW 0 24 72 Left 2
WINDOW 3 42 18 Left 2
SYMATTR InstName D7
SYMATTR Value 1N750
SYMBOL pnp 784 304 M180
SYMATTR InstName Q2
SYMATTR Value BC557B
SYMBOL pnp 656 384 M180
SYMATTR InstName Q3
SYMATTR Value BC557C
SYMBOL res 448 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 270k
SYMBOL res 752 128 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R3
SYMATTR Value 22
SYMBOL res 704 128 R0
SYMATTR InstName R4
SYMATTR Value 47k
SYMBOL res 608 112 R0
WINDOW 3 32 90 Left 2
SYMATTR Value 4.7Meg
SYMATTR InstName R5
SYMBOL Optos\\4N25 1024 176 R0
SYMATTR InstName U1
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 1184 256 R0
SYMATTR InstName R6
SYMATTR Value 1k
SYMBOL res 224 352 R0
SYMATTR InstName R7
SYMATTR Value {Rlast}
SYMBOL res 352 96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 220k
TEXT -240 424 Left 2 !.tran 0 500m 470m startup
TEXT -240 440 Left 2 !.include 1N4007.lib
TEXT -240 456 Left 2 !.param Rlast 150k