Version 4
SHEET 1 1044 680
WIRE -64 112 -96 112
WIRE 64 112 -32 112
WIRE 256 112 144 112
WIRE 352 112 272 112
WIRE -32 144 -32 112
WIRE -32 144 -176 144
WIRE 240 144 -32 144
WIRE 352 144 352 112
WIRE 0 176 -48 176
WIRE 240 176 240 144
WIRE 240 176 224 176
WIRE 256 176 256 112
WIRE 320 176 256 176
WIRE 416 176 384 176
WIRE 528 176 496 176
WIRE 528 224 528 176
WIRE -16 240 -96 240
WIRE 0 240 -16 240
WIRE 272 240 272 112
WIRE 272 240 224 240
WIRE 272 256 272 240
WIRE -176 272 -176 144
WIRE -64 304 -64 112
WIRE 0 304 -64 304
WIRE 240 304 224 304
WIRE -96 320 -96 240
WIRE 240 352 240 304
WIRE 272 352 272 320
WIRE 272 352 240 352
WIRE 528 352 528 288
WIRE 528 352 272 352
WIRE -32 368 -32 144
WIRE 0 368 -32 368
WIRE 272 368 224 368
WIRE 272 384 272 368
WIRE -16 400 -16 240
WIRE 240 400 240 352
WIRE 240 400 -16 400
WIRE -176 416 -176 352
WIRE -144 416 -176 416
WIRE -144 432 -144 416
WIRE -176 464 -176 416
WIRE -96 464 -96 384
WIRE -96 464 -176 464
WIRE -48 464 -48 176
WIRE -48 464 -96 464
WIRE 272 464 272 448
WIRE 272 464 -48 464
FLAG -144 432 0
FLAG -96 112 Out
IOPIN -96 112 Out
SYMBOL Robertugo\\555_ALL 160 288 R0
WINDOW 38 -75 81 Left 0
WINDOW 0 -62 -81 Left 0
SYMATTR InstName U1
SYMBOL Robertugo\\Pote 416 160 R90
WINDOW 123 54 65 VCenter 0
WINDOW 0 33 102 VRight 0
WINDOW 3 -42 -33 VRight 0
SYMATTR Value2 Set={Cursor}
SYMATTR InstName U2
SYMATTR Value Rt=100K
SYMBOL res 160 96 R90
WINDOW 0 45 134 VBottom 0
WINDOW 3 18 -5 VTop 0
SYMATTR InstName Ron
SYMATTR Value 1k
SYMBOL cap -112 320 R0
WINDOW 0 21 8 Left 0
WINDOW 3 19 64 Left 0
SYMATTR InstName Ct
SYMATTR Value 1n
SYMBOL cap 256 384 R0
WINDOW 0 21 8 Left 0
WINDOW 3 19 64 Left 0
SYMATTR InstName Cbp
SYMATTR Value 10n
SYMBOL voltage -176 256 R0
WINDOW 3 -13 59 Left 0
SYMATTR Value 12
SYMATTR InstName Vcc
SYMBOL diode 256 256 R0
WINDOW 0 41 0 Left 0
WINDOW 3 43 30 Left 0
SYMATTR InstName Don
SYMATTR Value 1N914
SYMBOL diode 544 288 R180
WINDOW 0 43 37 Left 0
WINDOW 3 43 11 Left 0
SYMATTR InstName Doff
SYMATTR Value 1N914
SYMBOL res 512 160 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName Roff
SYMATTR Value 1k
TEXT -874 130 Left 0 !.tran 2m
TEXT -872 152 Left 0 !.params: Vdd 12 Ronx=.1 \n.step param Cursor  0 1 .25\n.meas tran ta FIND time WHEN V(out)={Vdd/2} td=1m rise=1\n.meas tran tb FIND time WHEN V(out)={Vdd/2} td=1m rise=11\n.meas tran Frec PARAM 10/(tb-ta)\n.Meas tran Tc FIND time WHEN V(Out)={Vdd/2} td=1m fall=1\n.Meas tran Td FIND time WHEN V(Out)={Vdd/2} td=1m fall=2\n.Meas tran T1 Param  (Tc-Ta)\n.Meas tran T2  Param  (Td-Ta)\n.Meas tran Ton Param If (T1>0, T1, T2)\n.Meas tran Duty% Param  Ton*Frec*100
TEXT 288 144 Left 0 ;Ron
TEXT 376 144 Left 0 ;Roff