Version 4
SHEET 1 880 680
WIRE -144 112 -192 112
WIRE 128 112 -144 112
WIRE 320 112 128 112
WIRE 400 112 320 112
WIRE 512 112 400 112
WIRE 592 112 512 112
WIRE 512 128 512 112
WIRE -112 144 -128 144
WIRE 128 144 128 112
WIRE 128 144 112 144
WIRE 320 160 320 112
WIRE -112 208 -160 208
WIRE 144 208 112 208
WIRE 256 208 224 208
WIRE 400 208 400 176
WIRE 512 240 512 208
WIRE -112 272 -176 272
WIRE 224 272 112 272
WIRE 320 288 320 256
WIRE 400 288 400 272
WIRE 400 288 320 288
WIRE 448 288 400 288
WIRE 400 304 400 288
WIRE -144 336 -144 112
WIRE -112 336 -144 336
WIRE 128 336 112 336
WIRE 656 336 544 336
WIRE 592 352 592 112
WIRE 544 368 544 336
WIRE 560 368 544 368
WIRE 656 384 656 336
WIRE 656 384 624 384
WIRE 672 384 656 384
WIRE -160 400 -160 208
WIRE 224 400 224 272
WIRE 224 400 -160 400
WIRE 512 400 512 336
WIRE 512 400 224 400
WIRE 560 400 512 400
WIRE 512 416 512 400
WIRE -176 448 -176 272
WIRE -80 448 -176 448
WIRE 128 448 128 336
WIRE 224 448 224 400
WIRE -192 464 -192 112
WIRE 128 464 128 448
WIRE 400 464 400 384
WIRE 448 464 400 464
WIRE 512 528 512 512
WIRE 400 544 400 528
WIRE -192 560 -192 544
WIRE -160 560 -192 560
WIRE -160 576 -160 560
WIRE -192 624 -192 560
WIRE -128 624 -128 144
WIRE -128 624 -192 624
WIRE 128 624 128 544
WIRE 128 624 -128 624
WIRE 224 624 224 512
WIRE 224 624 128 624
WIRE 400 624 400 608
WIRE 400 624 224 624
WIRE 512 624 512 608
WIRE 512 624 400 624
WIRE 592 624 592 416
WIRE 592 624 512 624
FLAG 672 384 Out
IOPIN 672 384 Out
FLAG -160 576 0
FLAG -80 448 Pulse
IOPIN -80 448 Out
FLAG 128 448 Ctrl
SYMBOL Robertugo\\555_ALL 48 256 R0
WINDOW 38 -82 76 Left 0
SYMATTR InstName U1
SYMBOL res 384 288 R0
WINDOW 0 -36 40 Left 0
WINDOW 3 -37 69 Left 0
SYMATTR InstName R1
SYMATTR Value 680
SYMBOL cap 208 448 R0
SYMATTR InstName C1
SYMATTR Value 10n
SYMBOL pnp2 256 256 M180
WINDOW 0 -33 126 Left 0
WINDOW 3 -34 101 Left 0
SYMATTR InstName Q1
SYMATTR Value 2N3906
SYMBOL res 496 112 R0
WINDOW 0 -39 29 Left 0
WINDOW 3 -36 66 Left 0
SYMATTR InstName Rv1
SYMATTR Value 1k
SYMBOL Robertugo\\OPAMP5 592 320 R0
WINDOW 0 -26 64 Left 0
WINDOW 38 11 116 Left 0
SYMATTR InstName U2
SYMATTR SpiceModel TL082
SYMBOL voltage -192 448 R0
WINDOW 0 23 19 Left 0
WINDOW 3 -11 61 Left 0
SYMATTR InstName V+
SYMATTR Value 12
SYMBOL diode 416 112 M0
WINDOW 0 55 36 Left 0
WINDOW 3 21 60 Left 0
SYMATTR InstName D1
SYMATTR Value 1N914
SYMBOL res 240 192 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName Rbuf
SYMATTR Value 22k
SYMBOL diode 416 208 M0
WINDOW 0 58 -15 Left 0
WINDOW 3 23 6 Left 0
SYMATTR InstName D2
SYMATTR Value 1N914
SYMBOL pnp2 448 336 M180
WINDOW 0 -21 129 Left 0
WINDOW 3 -21 104 Left 0
SYMATTR InstName Q2
SYMATTR Value 2N3906
SYMBOL npn2 448 416 R0
WINDOW 0 31 47 Left 0
WINDOW 3 -40 3 Left 0
SYMATTR InstName Q3
SYMATTR Value 2N3904
SYMBOL res 496 512 R0
WINDOW 0 -39 29 Left 0
WINDOW 3 -36 66 Left 0
SYMATTR InstName Rv2
SYMATTR Value 2k
SYMBOL diode 416 464 M0
WINDOW 0 35 33 Left 0
WINDOW 3 21 60 Left 0
SYMATTR InstName D3
SYMATTR Value 1N914
SYMBOL diode 384 544 R0
WINDOW 0 -35 33 Left 0
WINDOW 3 -55 65 Left 0
SYMATTR InstName D4
SYMATTR Value 1N914
SYMBOL voltage 128 448 R0
WINDOW 0 -12 57 Left 0
WINDOW 3 -220 -71 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vc
SYMATTR Value {valor}
TEXT -114 584 Left 0 !.tran 5m
TEXT -96 488 Left 0 ;Para duty=50%\n(triangular pura):\nRv2=.2*Rv1
TEXT -128 608 Left 0 !.step param valor 2 11 1