Version 4
SHEET 1 880 680
WIRE 256 -96 144 -96
WIRE 320 -96 256 -96
WIRE 432 -96 400 -96
WIRE 256 -80 256 -96
WIRE 432 -32 432 -96
WIRE 256 16 256 0
WIRE 272 16 256 16
WIRE 368 16 352 16
WIRE 144 32 144 -96
WIRE 256 64 256 16
WIRE 512 64 432 64
WIRE 624 64 512 64
WIRE 320 96 288 96
WIRE 336 96 320 96
WIRE 432 96 432 64
WIRE 432 96 416 96
WIRE 320 112 320 96
WIRE 512 112 512 64
WIRE 432 128 432 96
WIRE 144 208 144 112
WIRE 256 208 256 128
WIRE 320 208 320 192
WIRE 432 208 432 192
WIRE 512 208 512 192
FLAG 144 208 0
FLAG 256 208 0
FLAG 624 64 out
FLAG 320 208 0
FLAG 432 208 0
FLAG 512 208 0
SYMBOL TL431 272 64 M0
WINDOW 3 31 7 Left 0
SYMATTR InstName U1
SYMBOL res 240 -96 R0
SYMATTR InstName R1
SYMATTR Value 20k
SYMBOL voltage 144 16 R0
WINDOW 3 45 60 Left 2
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value 48
SYMATTR InstName V1
SYMBOL npn 368 -32 R0
SYMATTR InstName Q1
SYMATTR Value BD139
SYMBOL res 432 80 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 240k
SYMBOL res 304 96 R0
SYMATTR InstName R3
SYMATTR Value 22k
SYMBOL res 368 0 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 100
SYMBOL cap 416 128 R0
SYMATTR InstName C1
SYMATTR Value 10µ
SYMBOL current 512 112 R0
WINDOW 123 24 95 Left 2
WINDOW 39 0 0 Left 0
SYMATTR InstName I1
SYMATTR Value PULSE(0 .05 0.1 1 0 1)
SYMBOL res 416 -112 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R5
SYMATTR Value 330
TEXT 464 8 Left 2 !.tran 0 1.2 .1 startup