Version 4
SHEET 1 880 680
WIRE 192 -176 176 -176
WIRE 352 -176 336 -176
WIRE 176 -160 176 -176
WIRE 336 -160 336 -176
WIRE 624 0 608 0
WIRE 624 16 624 0
WIRE 288 48 256 48
WIRE 384 48 352 48
WIRE 512 48 464 48
WIRE 512 64 512 48
WIRE 624 112 624 96
WIRE 624 112 576 112
WIRE 624 128 624 112
WIRE 192 176 176 176
WIRE 384 176 336 176
WIRE 512 176 512 160
WIRE 512 176 480 176
WIRE 192 192 192 176
WIRE 624 208 624 192
WIRE 336 240 336 176
WIRE 192 288 192 272
WIRE 272 288 192 288
WIRE 192 336 192 288
WIRE 336 352 336 336
WIRE 400 352 336 352
WIRE 464 352 400 352
WIRE 336 368 336 352
WIRE 464 368 464 352
WIRE 192 480 192 400
WIRE 336 480 336 448
WIRE 336 480 192 480
WIRE 464 480 464 448
WIRE 464 480 336 480
WIRE 336 496 336 480
FLAG 192 -176 vs
FLAG 176 -80 0
FLAG 400 352 rext
FLAG 384 176 out
FLAG 176 176 EN
FLAG 336 496 0
FLAG 256 48 vs
FLAG 336 -80 0
FLAG 352 -176 EN
FLAG 384 48 lk
FLAG 608 0 vs
FLAG 624 208 0
FLAG 464 48 lk
FLAG 480 176 out
SYMBOL voltage 176 -176 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 112 Left 2
SYMATTR InstName V1
SYMATTR Value 48
SYMATTR SpiceLine Rser=100m
SYMBOL diode 176 336 R0
WINDOW 123 24 80 Left 2
SYMATTR InstName Dint
SYMATTR Value 1N4148
SYMATTR Value2 n=2
SYMBOL res 320 352 R0
SYMATTR InstName Rint
SYMATTR Value 42
SYMBOL npn 272 240 R0
SYMATTR InstName Q1
SYMATTR Value BC817-40
SYMBOL res 176 176 R0
SYMATTR InstName Ren
SYMATTR Value 10k
SYMBOL res 448 352 R0
SYMATTR InstName Rext
SYMATTR Value 2
SYMBOL voltage 336 -176 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 112 Left 2
SYMATTR InstName V2
SYMATTR Value PULSE(0 5 1m 1u 1u 500u 1m)
SYMATTR SpiceLine Rser=20
SYMBOL res 640 0 M0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL zener 608 192 M180
WINDOW 0 24 64 Left 2
WINDOW 3 24 0 Left 2
SYMATTR InstName D2
SYMATTR Value BZX84C15L
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL npn 576 64 M0
SYMATTR InstName Q2
SYMATTR Value 2SCR514P
SYMBOL diode 288 64 R270
WINDOW 0 32 32 VTop 2
WINDOW 3 0 32 VBottom 2
WINDOW 123 -16 32 VBottom 2
SYMATTR InstName D1
SYMATTR Value LXHL-BW02
SYMATTR Value2 n=12
TEXT 128 -24 Left 2 !.tran 0 5m 0 1u
TEXT 160 144 Left 2 ;BCR321U
RECTANGLE Normal 416 512 128 128 2