Version 4
SHEET 1 1444 680
WIRE 16 176 16 144
WIRE 16 256 16 240
WIRE 16 352 16 320
WIRE 16 384 16 352
WIRE 16 480 16 448
WIRE 48 176 16 176
WIRE 112 352 16 352
WIRE 112 384 112 352
WIRE 112 480 16 480
WIRE 112 480 112 448
WIRE 144 176 112 176
WIRE 176 240 16 240
WIRE 176 240 176 208
WIRE 224 368 224 272
WIRE 224 384 224 368
WIRE 224 480 112 480
WIRE 224 480 224 464
WIRE 224 496 224 480
WIRE 256 240 176 240
WIRE 256 272 224 272
WIRE 272 176 208 176
WIRE 288 224 288 208
WIRE 288 480 224 480
WIRE 288 480 288 288
WIRE 400 144 16 144
WIRE 400 176 336 176
WIRE 400 176 400 144
WIRE 400 256 320 256
WIRE 400 256 400 176
WIRE 400 272 400 256
WIRE 400 368 224 368
WIRE 400 368 400 352
WIRE 432 256 400 256
WIRE 528 208 288 208
WIRE 528 272 528 208
WIRE 528 368 400 368
WIRE 528 368 528 352
WIRE 608 208 528 208
WIRE 624 208 608 208
WIRE 624 368 624 208
WIRE 624 480 288 480
WIRE 624 480 624 448
FLAG 224 496 0
FLAG 432 256 Out
FLAG 608 208 Vdd
SYMBOL Robertugo\\pote 112 192 R270
WINDOW 0 30 17 VCenter 0
WINDOW 3 30 135 VCenter 0
WINDOW 123 -62 57 VCenter 0
SYMATTR InstName U1
SYMATTR Value Rt=10K
SYMATTR Value2 Set={cursor}
SYMBOL res 384 256 R0
SYMATTR InstName R1
SYMATTR Value 100k
SYMBOL res 208 368 R0
WINDOW 3 24 82 Left 0
SYMATTR Value 100k
SYMATTR InstName R2
SYMBOL diode 0 384 R0
SYMATTR InstName D1
SYMATTR Value 1N914
SYMBOL diode 96 448 M180
WINDOW 0 25 61 Left 0
WINDOW 3 24 -10 Left 0
SYMATTR InstName D2
SYMATTR Value 1N914
SYMBOL cap 0 256 R0
WINDOW 0 46 8 Left 0
WINDOW 3 41 34 Left 0
SYMATTR InstName C1
SYMATTR Value 4n7
SYMBOL diode 48 160 M90
WINDOW 0 16 -13 VBottom 0
WINDOW 3 28 0 VTop 0
SYMATTR InstName D3
SYMATTR Value 1N914
SYMBOL diode 272 160 M90
WINDOW 0 16 79 VBottom 0
WINDOW 3 17 88 VTop 0
SYMATTR InstName D4
SYMATTR Value 1N914
SYMBOL voltage 624 352 R0
WINDOW 0 -20 58 Left 0
WINDOW 3 -26 57 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 -26 85 Left 0
SYMATTR InstName Vcc
SYMATTR Value PULSE(0 {VDD} 0 1u)
SYMBOL res 512 256 R0
SYMATTR InstName R3
SYMATTR Value 100k
SYMBOL Robertugo\\OPAMP5 288 192 R0
WINDOW 0 -29 64 Left 0
SYMATTR InstName U2
SYMATTR SpiceModel TL082
TEXT 430 192 Left 0 !.tran 2m
TEXT 680 192 Left 0 !.step param cursor .05 .95 .15\n.param Vdd=12\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