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Time Delay Circuit

Discussion in 'General Electronics Discussion' started by mngeow, Jan 13, 2010.

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  1. mngeow

    mngeow

    24
    0
    Jan 13, 2010
    Hi guys,is there anyway to get time delay with D Flip Flops?For my project my school does not allow me to use a 555 IC,this is their way of challenging us I suppose?Haha.Anyway if possible give me a diagram of some sort that I could follow.Thanks for your help!:)
     
  2. alex88

    alex88

    8
    0
    Jan 20, 2010
    How long you want to get for delay? if not long(less than 2^8 clock time), 8 counter will be enough for you.
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,505
    2,853
    Jan 21, 2010
    Have a look at what you can do with schmitt triggers.

    http://www.fairchildsemi.com/an/AN/AN-140.pdf

    The hex Schmitt trigger is so versatile I sometimes wonder why they bothered to make any other logic at all :-D

    1 Schmitt trigger can do much that you might want a 555 to do, and there are 6 in the package!
     
  4. andreapg

    andreapg

    11
    0
    Jan 29, 2010
    When the start button switch in open, pin 2 is on the high level; pin 6 is on the low level, because discharge switch (pin 7) is closed to the ground.
    When I press the button, pin 2 goes to the low level, than the output (pin 3) will be energized. Discharge switch is now open, but pin 6 is closed to the ground by the capacitor, so it is on the low level.
    When the capacitor is full charged, pin 6 goes to the high level, than the output goes to the start condition.
     
  5. andreapg

    andreapg

    11
    0
    Jan 29, 2010
  6. andreapg

    andreapg

    11
    0
    Jan 29, 2010
  7. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,505
    2,853
    Jan 21, 2010
    andreapg, note the above quote :)
     
  8. andreapg

    andreapg

    11
    0
    Jan 29, 2010
    Thank you. I didn' t know the meaning of "allow", so I didn' t understand the real problem...
     
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