Version 4
SHEET 1 996 680
WIRE 192 128 -192 128
WIRE -400 144 -448 144
WIRE -288 144 -336 144
WIRE -176 160 -240 160
WIRE 192 160 192 128
WIRE 192 160 48 160
WIRE -448 176 -448 144
WIRE -368 192 -368 176
WIRE -288 192 -288 144
WIRE -288 192 -368 192
WIRE -256 208 -416 208
WIRE -176 224 -224 224
WIRE 80 224 48 224
WIRE 192 224 192 160
WIRE 192 224 160 224
WIRE -448 272 -448 240
WIRE -288 272 -288 192
WIRE -256 288 -256 208
WIRE -176 288 -256 288
WIRE 80 288 48 288
WIRE 192 288 192 224
WIRE -448 352 -448 336
WIRE -368 352 -448 352
WIRE -288 352 -288 336
WIRE -288 352 -368 352
WIRE -224 352 -224 224
WIRE -224 352 -288 352
WIRE -192 352 -192 128
WIRE -176 352 -192 352
WIRE 112 352 48 352
WIRE -368 368 -368 352
WIRE 112 368 112 352
WIRE -224 384 -224 352
WIRE 80 384 80 288
WIRE 80 384 -224 384
WIRE 192 400 192 368
WIRE 192 400 160 400
WIRE -256 416 -256 288
WIRE -256 416 -272 416
WIRE 160 416 160 400
WIRE -368 448 -368 432
WIRE -240 448 -240 160
WIRE -240 448 -368 448
WIRE 112 448 112 432
WIRE 112 448 -240 448
WIRE 192 448 192 400
WIRE 192 448 112 448
FLAG 160 416 0
FLAG -272 416 Out
IOPIN -272 416 Out
SYMBOL cap -384 368 R0
WINDOW 0 -49 7 Left 0
WINDOW 3 -51 31 Left 0
SYMATTR InstName C1
SYMATTR Value 10n
SYMATTR SpiceLine V=50v
SYMBOL polcap 96 368 R0
WINDOW 0 -45 46 Left 0
WINDOW 3 -44 69 Left 0
SYMATTR InstName C2
SYMATTR Value 10n
SYMATTR Description Capacitor
SYMATTR Type cap
SYMATTR SpiceLine V=50 Irms=22m Rser=3.9 MTBF=2000 Lser=0 ppPkg=1
SYMBOL diode -464 272 R0
WINDOW 3 24 72 Invisible 0
WINDOW 0 40 35 Left 0
SYMATTR Value 1N914
SYMATTR InstName D1
SYMBOL diode -272 336 R180
WINDOW 0 38 28 Left 0
WINDOW 3 24 0 Invisible 0
SYMATTR InstName D2
SYMATTR Value 1N914
SYMBOL Misc\\battery 192 272 R0
WINDOW 0 -82 40 Left 0
WINDOW 3 -82 68 Left 0
SYMATTR InstName Vcc
SYMATTR Value 12v
SYMATTR Value2 AC 0 0
SYMATTR SpiceLine Rser=1 Cpar=100u
SYMBOL res 176 208 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R4
SYMATTR Value 100k
SYMBOL Pote -432 144 M0
WINDOW 123 -65 129 Center 0
WINDOW 3 -36 104 Center 0
WINDOW 0 -71 77 Left 0
SYMATTR Value2 set={Cursor}
SYMATTR Value rt=10k
SYMATTR InstName Duty
SYMBOL Pote -304 160 M270
WINDOW 0 -4 137 VLeft 0
WINDOW 3 30 -18 VCenter 0
WINDOW 123 -17 22 VCenter 0
SYMATTR InstName Freq
SYMATTR Value rt=10k
SYMATTR Value2 set=0
SYMBOL 555_ALL -16 272 R0
WINDOW 38 -83 78 Left 0
SYMATTR InstName U1
TEXT 240 120 Left 0 !.tran 0 4m 0
TEXT 240 152 Left 0 !.params: Vdd 12 Ronx=.1 \n.step param Cursor  .1 .9 .2\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