Version 4
SHEET 1 896 680
WIRE 192 96 112 96
WIRE 480 96 352 96
WIRE 704 96 480 96
WIRE 480 160 480 96
WIRE 704 160 704 96
WIRE 112 192 112 96
WIRE 112 192 48 192
WIRE 192 272 48 272
WIRE 480 288 480 240
WIRE 592 288 480 288
WIRE 192 304 192 272
WIRE 192 304 96 304
WIRE 704 320 704 240
WIRE 96 336 96 304
WIRE 480 336 480 288
WIRE 592 368 592 288
WIRE 640 368 592 368
WIRE 304 384 192 384
WIRE 416 384 384 384
WIRE 96 464 96 416
WIRE 192 464 96 464
WIRE 480 464 480 432
WIRE 704 464 704 416
WIRE 192 496 192 464
FLAG 192 176 0
FLAG 192 496 0
FLAG 352 176 0
FLAG 480 464 0
FLAG 704 464 0
SYMBOL voltage 352 80 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 24V
SYMBOL voltage 192 80 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 8V
SYMBOL res 176 288 R0
SYMATTR InstName R1
SYMATTR Value 300R
SYMBOL res 176 368 R0
SYMATTR InstName R2
SYMATTR Value 700R
SYMBOL res 80 320 R0
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL res 400 368 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R4
SYMATTR Value 1k
SYMBOL npn 416 336 R0
SYMATTR InstName Q1
SYMATTR Value BC547C
SYMBOL npn 640 320 R0
SYMATTR InstName Q2
SYMATTR Value BC547C
SYMBOL res 464 144 R0
SYMATTR InstName R5
SYMATTR Value 1k
SYMBOL current 48 192 R0
WINDOW 0 -259 20 Left 0
WINDOW 3 -443 59 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName NAMUR_SENSOR
SYMATTR Value PULSE(1m 3m 0 1m 1m 100m 200m)
SYMBOL res 688 144 R0
SYMATTR InstName R6
SYMATTR Value 1k
TEXT 336 -24 Left 0 !.tran 1s