Version 4
SHEET 1 908 680
WIRE 128 -32 32 -32
WIRE 656 -32 496 -32
WIRE 240 48 128 48
WIRE 336 48 240 48
WIRE 496 48 432 48
WIRE 512 48 496 48
WIRE 240 80 240 48
WIRE 32 96 32 -32
WIRE 128 96 32 96
WIRE 656 144 656 -32
WIRE 32 160 32 96
WIRE 512 192 512 48
WIRE 128 256 128 96
WIRE 384 256 384 192
WIRE 384 256 128 256
WIRE 32 288 32 240
WIRE 512 288 512 272
WIRE 656 288 656 224
FLAG 32 288 0
FLAG 656 288 0
FLAG 512 288 0
SYMBOL res 112 -48 R0
WINDOW 0 35 39 Left 2
SYMATTR InstName R1
SYMATTR Value 3k
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 480 -48 R0
SYMATTR InstName R2
SYMATTR Value 3k
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL npn 432 112 M270
SYMATTR InstName Q1
SYMATTR Value BC847A
SYMBOL voltage 32 144 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value 3.3
SYMBOL res 368 96 R0
WINDOW 0 36 41 Left 2
WINDOW 3 30 79 Left 2
SYMATTR InstName R3
SYMATTR Value 475
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL voltage 656 128 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL voltage 512 176 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value PULSE(0 5 0 0 0 0.01 0.02)
SYMBOL voltage 240 64 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V4
SYMATTR Value 0
TEXT -306 328 Left 2 !.tran 0 0.1 0 0.00001