Version 4
SHEET 1 880 680
WIRE 672 0 400 0
WIRE 400 48 400 0
WIRE 672 112 672 80
WIRE 400 176 400 128
WIRE 400 176 272 176
WIRE 512 176 400 176
WIRE -96 224 -128 224
WIRE 208 224 -16 224
WIRE 400 288 400 176
WIRE -128 304 -128 224
WIRE -128 432 -128 384
WIRE 272 432 272 272
WIRE 400 432 400 368
FLAG 272 432 0
FLAG 400 432 0
FLAG 672 112 0
FLAG -128 432 0
SYMBOL npn 208 176 R0
SYMATTR InstName Q1
SYMATTR Value BC547B
SYMBOL res 0 208 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res 384 32 R0
SYMATTR InstName R2
SYMATTR Value 2.7k
SYMBOL res 384 272 R0
SYMATTR InstName R3
SYMATTR Value 4.7k
SYMBOL voltage -128 288 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PULSE(0 3.3 0 100n 100n 1m 2m)
SYMBOL voltage 672 -16 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value 5
TEXT 528 160 Left 2 ;GPIO\n3,3V
TEXT -200 208 Left 2 ;GPIO\n3,3V
TEXT -202 456 Left 2 !.tran 5m