Version 4
SHEET 1 880 680
WIRE 176 96 -80 96
WIRE 288 96 176 96
WIRE 384 96 288 96
WIRE 288 112 288 96
WIRE -64 128 -112 128
WIRE 176 128 176 96
WIRE 176 128 160 128
WIRE -112 144 -112 128
WIRE -96 192 -192 192
WIRE -64 192 -96 192
WIRE 176 192 160 192
WIRE 384 224 384 96
WIRE -64 256 -144 256
WIRE 176 256 176 192
WIRE 176 256 160 256
WIRE 272 256 176 256
WIRE 288 256 288 192
WIRE 288 256 272 256
WIRE -192 272 -192 192
WIRE -144 272 -144 256
WIRE 272 288 272 256
WIRE 272 288 256 288
WIRE 288 304 288 256
WIRE -80 320 -80 96
WIRE -64 320 -80 320
WIRE 192 336 176 336
WIRE -96 352 -96 192
WIRE 176 352 176 336
WIRE 176 352 -96 352
WIRE -192 384 -192 352
WIRE -144 384 -144 352
WIRE -144 384 -192 384
WIRE 256 384 -144 384
WIRE 288 384 288 368
WIRE 288 384 256 384
WIRE 384 384 384 304
WIRE 384 384 288 384
WIRE 288 400 288 384
FLAG 288 400 0
FLAG -112 144 0
SYMBOL Robertugo\\555_ALL 96 240 R0
SYMATTR InstName U1
SYMBOL pnp2 192 384 M180
WINDOW 0 21 50 Left 0
WINDOW 3 -30 109 Left 0
SYMATTR InstName Q1
SYMATTR Value 2N3906
SYMBOL res 272 96 R0
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL cap 272 304 R0
SYMATTR InstName C1
SYMATTR Value 51n
SYMBOL Miscel\\voltage 384 208 R0
WINDOW 0 -49 7 Left 0
WINDOW 3 -13 60 Left 0
SYMATTR InstName Vcc
SYMATTR Value 12
SYMBOL Miscel\\voltage -192 256 R0
WINDOW 0 -23 60 Left 0
WINDOW 3 4 112 Invisible 0
WINDOW 123 0 0 Left 0
SYMATTR InstName Vs1
SYMATTR Value PWL(0 12 499u 12 500u 0 999u 0 1m 12 1.499m 12 1.5m 0 1.999m 0 2m 12 2.999m 12 3m 0 3.499m 0 3.5m 12 3.99m 12 4m 0)
SYMATTR SpiceLine Rser=1k
SYMBOL res -160 256 R0
SYMATTR InstName R2
SYMATTR Value 1k
TEXT -50 402 Left 0 !.tran 6m