delayed monostable

Discussion in 'Homework Help' started by raffter, Jul 13, 2008.

  1. raffter

    Thread Starter Active Member

    Feb 28, 2008
    113
    0
    Hello guys,

    need help :(

    kindly reffer attached image.... I have no idea HOW im going to make a delay with this... the 1 shot monostable, I could do... but the delay, clueless :confused:


    -Ralph
     
  2. theamber

    Active Member

    Jun 13, 2008
    318
    0
    Easily you can use a 555 push-pull circuit that will produce push-pull pulses but they are not good square-waves and they are not a modified sine-wave. You could delay the startup of the oscillator.
    You can build a circuit with "presettable mark/space ratio" the mark and space are the high low ratios of the waveform.
    More info here:
    http://www.talkingelectronics.com/FreeProjects/555/555-P2.html
     
  3. raffter

    Thread Starter Active Member

    Feb 28, 2008
    113
    0

    its NOT an oscillator...the input is manually triggered..like I said before, its a 1 shot monostable, BUT with a -delayed- output... :)
     
  4. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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  5. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Use two monostables, one for the delay and the other for your pulse.
     
  6. raffter

    Thread Starter Active Member

    Feb 28, 2008
    113
    0

    ok.. BUT how do I wire this thing up? the 1 second delay..
     
  7. raffter

    Thread Starter Active Member

    Feb 28, 2008
    113
    0

    GOT IT :)

    a long "delay" monostable + inverter + short "delay" monostable...

    BUT!!

    I still have minor problem, even with a 500mS logic "1" trigger only, IT STILL TRIGGERS... finding a way HOW to NOT accept trigger pulses below 1sec "1" input...
     
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