Version 4
SHEET 1 880 680
WIRE -192 128 -352 128
WIRE -144 128 -192 128
WIRE 0 128 -144 128
WIRE 288 128 0 128
WIRE 432 128 288 128
WIRE -352 144 -352 128
WIRE -192 144 -192 128
WIRE 16 160 -32 160
WIRE 288 160 288 128
WIRE 288 160 240 160
WIRE -144 176 -144 128
WIRE -272 192 -288 192
WIRE -256 192 -272 192
WIRE 16 224 -16 224
WIRE 256 224 240 224
WIRE -272 240 -272 192
WIRE -208 240 -272 240
WIRE -192 240 -208 240
WIRE -352 256 -352 240
WIRE -352 256 -368 256
WIRE 432 256 432 128
WIRE -352 288 -352 256
WIRE -272 288 -352 288
WIRE -144 288 -144 256
WIRE -64 288 -64 256
WIRE -64 288 -144 288
WIRE 16 288 -64 288
WIRE 256 288 256 224
WIRE 256 288 240 288
WIRE 336 288 336 272
WIRE 336 288 256 288
WIRE 384 288 336 288
WIRE -432 304 -464 304
WIRE -464 320 -464 304
WIRE 384 320 384 288
WIRE -16 336 -16 224
WIRE -16 336 -208 336
WIRE -336 352 -368 352
WIRE -64 352 -256 352
WIRE -32 352 -32 160
WIRE -32 352 -64 352
WIRE 0 352 0 128
WIRE 16 352 0 352
WIRE 320 352 240 352
WIRE -64 384 -64 352
WIRE -16 384 -16 336
WIRE 256 384 256 288
WIRE 256 384 -16 384
WIRE -464 416 -464 400
WIRE -32 416 -32 352
WIRE -32 416 -464 416
WIRE 320 416 -32 416
WIRE 384 416 384 384
WIRE 384 416 320 416
WIRE 432 416 432 336
WIRE 432 416 384 416
FLAG -64 256 Out
IOPIN -64 256 Out
FLAG -64 384 0
FLAG 336 272 Ramp
IOPIN 336 272 Out
FLAG -464 304 Vctrl
SYMBOL voltage 432 240 R0
WINDOW 0 -33 8 Left 0
WINDOW 3 -13 57 Left 0
SYMATTR InstName V+
SYMATTR Value 15
SYMBOL Robertugo\\555_ALL 176 272 R0
WINDOW 38 -86 82 Left 0
WINDOW 0 -62 -82 Left 0
SYMATTR InstName U1
SYMBOL cap 368 320 R0
WINDOW 0 -16 8 Left 0
WINDOW 3 -15 52 Left 0
SYMATTR InstName Ct
SYMATTR Value 1n
SYMBOL pnp2 -288 240 R180
WINDOW 0 -5 97 Left 0
WINDOW 3 20 48 Left 0
SYMATTR InstName Q1
SYMATTR Value 2N3906
SYMBOL cap 304 352 R0
WINDOW 0 -38 16 Left 0
WINDOW 3 -33 49 Left 0
SYMATTR InstName Cbp
SYMATTR Value 10n
SYMBOL res -160 160 R0
WINDOW 0 26 47 Left 0
WINDOW 3 27 86 Left 0
SYMATTR InstName Rpu
SYMATTR Value 10k
SYMBOL pnp2 -256 240 M180
WINDOW 0 -5 97 Left 0
WINDOW 3 21 51 Left 0
SYMATTR InstName Q2
SYMATTR Value 2N3906
SYMBOL pnp2 -272 336 M180
WINDOW 0 58 70 Left 0
WINDOW 3 22 47 Left 0
SYMATTR InstName Q4
SYMATTR Value 2N3906
SYMBOL npn2 -432 256 R0
WINDOW 0 44 25 Left 0
WINDOW 3 19 49 Left 0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL res -240 336 R90
WINDOW 0 15 108 VBottom 0
WINDOW 3 -12 11 VTop 0
SYMATTR InstName Re
SYMATTR Value 10k
SYMBOL voltage -464 304 R0
WINDOW 0 -13 60 Left 0
WINDOW 3 231 89 Right 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vc
SYMATTR Value PULSE(0 12 0 1m)
TEXT -482 146 Left 0 !.tran 1m