Version 4
SHEET 1 880 736
WIRE -304 208 -304 144
WIRE -304 480 -304 288
WIRE -304 624 -304 480
WIRE -304 656 -304 624
WIRE -224 352 -224 320
WIRE -224 480 -304 480
WIRE -224 480 -224 432
WIRE -224 624 -304 624
WIRE -144 320 -224 320
WIRE -144 352 -144 320
WIRE -144 480 -224 480
WIRE -144 480 -144 416
WIRE -64 320 -144 320
WIRE 0 144 -304 144
WIRE 0 176 0 144
WIRE 0 272 0 240
WIRE 0 400 0 368
WIRE 0 512 0 480
WIRE 0 624 -160 624
WIRE 0 624 0 576
WIRE 64 624 0 624
WIRE 96 544 32 544
WIRE 128 512 128 464
WIRE 288 544 160 544
WIRE 400 544 368 544
WIRE 400 544 400 480
WIRE 400 624 144 624
WIRE 400 624 400 544
WIRE 512 480 400 480
WIRE 512 512 512 480
WIRE 512 656 512 592
FLAG -304 656 0
FLAG 512 656 0
FLAG 128 464 Out
IOPIN 128 464 Out
SYMBOL pnp2 -64 368 M180
SYMATTR InstName Q1
SYMATTR Value 2N5401
SYMBOL zener 16 240 R180
WINDOW 0 24 72 Left 0
WINDOW 3 24 0 Left 0
SYMATTR InstName D1
SYMATTR Value BZX84C8V2L
SYMBOL diode -160 416 M180
WINDOW 0 24 72 Left 0
WINDOW 3 24 0 Left 0
SYMATTR InstName D2
SYMATTR Value 1N914
SYMBOL res -240 336 R0
SYMATTR InstName R1
SYMATTR Value 10K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res -16 384 R0
SYMATTR InstName R2
SYMATTR Value 1K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL Robertugo\\Pote 16 480 M0
SYMATTR InstName U1
SYMATTR Value Rt=10K
SYMBOL voltage -304 192 R0
WINDOW 123 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 12
SYMATTR SpiceLine Rser=1 Cpar=10u
SYMBOL Robertugo\\Pote 64 528 M90
WINDOW 0 -62 126 VLeft 0
WINDOW 3 -35 173 VLeft 0
WINDOW 123 -9 130 VCenter 0
SYMATTR InstName U2
SYMATTR Value Rt=10K
SYMBOL cap -160 608 R90
WINDOW 0 6 58 VBottom 0
WINDOW 3 -22 9 VTop 0
SYMATTR InstName C1
SYMATTR Value 2n2
SYMBOL res 160 608 R90
WINDOW 0 5 108 VBottom 0
WINDOW 3 -22 13 VTop 0
SYMATTR InstName R3
SYMATTR Value 68K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL res 384 528 R90
WINDOW 0 5 108 VBottom 0
WINDOW 3 -22 13 VTop 0
SYMATTR InstName R4
SYMATTR Value 68K
SYMATTR SpiceLine tol=1 pwr=0.1
SYMBOL voltage 512 608 M180
WINDOW 123 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 140
SYMATTR SpiceLine Rser=1 Cpar=4u7
TEXT -298 160 Left 0 !.tran 10m