Version 4
SHEET 1 892 680
WIRE 320 -224 -240 -224
WIRE 384 -144 320 -144
WIRE 592 -144 464 -144
WIRE 592 -128 592 -144
WIRE 592 -128 576 -128
WIRE 576 -32 576 -48
WIRE 576 -32 336 -32
WIRE 576 -16 576 -32
WIRE 144 16 0 16
WIRE 272 16 224 16
WIRE 0 112 0 16
WIRE -240 192 -240 -224
WIRE 0 192 -240 192
WIRE 336 192 336 64
WIRE 336 192 0 192
WIRE 0 256 0 192
FLAG 0 256 0
SYMBOL voltage 0 96 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value PULSE(0 5 0 0 0 0.5m 1m)
SYMBOL npn 272 -32 R0
SYMATTR InstName Q1
SYMATTR Value 2N2222
SYMBOL res 240 0 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 4.75K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL voltage 320 -128 R180
WINDOW 0 24 96 Left 2
WINDOW 3 24 16 Left 2
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL Misc\\EuropeanResistor 480 -160 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 27 56 VTop 2
SYMATTR InstName R2
SYMATTR Value 13.3K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL Misc\\EuropeanResistor 560 -144 R0
SYMATTR InstName R3
SYMATTR Value 1
SYMATTR SpiceLine tol=1 pwr=0.1
TEXT -34 280 Left 2 !;tran 20m
TEXT -242 300 Left 2 !.tran 20m