Version 4
SHEET 1 1356 680
WIRE -176 352 -176 112
WIRE -176 416 -176 352
WIRE -176 528 -176 496
WIRE -176 544 -176 528
WIRE -144 384 -144 224
WIRE -128 528 -176 528
WIRE -128 528 -128 160
WIRE -112 160 -128 160
WIRE -112 224 -144 224
WIRE -112 288 -208 288
WIRE -112 352 -176 352
WIRE -16 448 -16 400
WIRE -16 528 -128 528
WIRE -16 528 -16 512
WIRE 128 112 -176 112
WIRE 128 160 112 160
WIRE 128 160 128 112
WIRE 128 352 112 352
WIRE 128 400 -16 400
WIRE 128 400 128 352
WIRE 208 288 112 288
WIRE 208 384 -144 384
WIRE 208 384 208 288
WIRE 208 432 208 384
WIRE 208 448 208 432
WIRE 208 528 -16 528
WIRE 208 528 208 512
WIRE 336 112 128 112
WIRE 336 128 336 112
WIRE 336 224 112 224
WIRE 336 224 336 208
WIRE 336 256 336 224
WIRE 336 352 336 320
WIRE 336 432 208 432
WIRE 336 432 336 416
WIRE 384 224 336 224
WIRE 384 384 368 384
WIRE 384 432 336 432
WIRE 384 432 384 384
WIRE 448 432 384 432
WIRE 448 432 448 384
WIRE 464 384 448 384
WIRE 496 224 464 224
WIRE 496 256 496 224
WIRE 496 352 496 320
WIRE 496 432 448 432
WIRE 496 432 496 416
FLAG -176 544 0
FLAG -208 288 Out
IOPIN -208 288 Out
SYMBOL Robertugo\\555_ALL 48 272 R0
WINDOW 38 -82 77 Left 0
SYMATTR InstName U1
SYMBOL cap 192 448 R0
SYMATTR InstName Ct
SYMATTR Value 10n
SYMBOL cap -32 448 R0
SYMATTR InstName Cbp
SYMATTR Value 10n
SYMBOL res 320 112 R0
WINDOW 0 -36 40 Left 0
WINDOW 3 -34 73 Left 0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL voltage -176 400 R0
WINDOW 0 3 107 Left 0
WINDOW 3 -15 59 Left 0
SYMATTR InstName Vcc
SYMATTR Value 12
SYMBOL res 480 208 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL diode 320 256 R0
SYMATTR InstName D1
SYMATTR Value 1N914
SYMBOL diode 480 320 M180
WINDOW 0 24 72 Left 0
WINDOW 3 24 0 Left 0
SYMATTR InstName D2
SYMATTR Value 1N914
SYMBOL Robertugo\\pote 352 320 M0
SYMATTR InstName Umark
SYMATTR Value Rt=10K
SYMATTR Value2 Set={Cursor}
SYMBOL Robertugo\\pote 480 320 R0
WINDOW 0 79 40 Center 0
SYMATTR InstName Uspace
SYMATTR Value Rt=10K
SYMATTR Value2 Set={Cursor2}
TEXT -178 96 Left 0 !.tran 0 5m 1m startup
TEXT 608 152 Left 0 !.params: Vdd 12 Ronx=.1 \n.step param Cursor  0 1 .34\n.step param Cursor2 0 1 .34\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