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Recent content by saeed451

  1. S

    calculate rise and fall time

    this is correct becuse 1/ln2 = 1.4 and the formule 1/1.4CR in the picture is for duty cycle 50 % with the same R and C in the circuit . ok ? so i should to writed it T=1.4(C1R2 + C2R3) and by changing c1r2 and c2r3 we can change duty cycle --- F = 216hz >>> T = 4.6ms >>> t1 =3.2 ms >>>t2=1.4 ms...
  2. S

    calculate rise and fall time

    tnx all . so if i want to design it with 2 tr and resistor and capacitor in base and collector (ASTABLE) i should to first : calculate frequency with ; so : T1 = ln2 r1c1 = 0.7 ms and T2 = ln2 r2c2 = 0.3 ms (for duty cycle 70%) and it give f= 1/T = 1khz correct?
  3. S

    calculate rise and fall time

    so how i can make 70 % or more with op-amp ? (sry i couldnt understand Pulse Techniques in colleje very well)
  4. S

    calculate rise and fall time

    ok so what s the simplest circuit for duty cycle 70%? f= 1khz how we should to design ?(without555)
  5. S

    calculate rise and fall time

    hi . how i can calculate rise and fall time of a pulse with this specification : f = 1 khz v = 5 v duty cycle = 70%
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