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Monostable multivibrator no input, the transistor1 in active mode?

  1. Nov 26, 2013 #1
    If T1 is in active mode all the time, will there be any current flow in this circuit? ( I think it is impossible to flow) thanks
     

    Attached Files:

  2. jcsd
  3. Nov 27, 2013 #2

    Baluncore

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    Science Advisor

    If T1 is on then the circuit will remain stable until... The input on the bottom left has a capacitor in series with a diode. The first negative input pulse will charge the input capacitor and flip T1 to off, but that can happen only once.
     
  4. Nov 29, 2013 #3

    NascentOxygen

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    Staff: Mentor

    If T1 is in the active region, there will be current flowing in RC1 and R at least.

    assuming the lower horizontal line is connected to a suitable voltage rail
     
  5. Nov 29, 2013 #4
    If there is no pulse, and the whole is only supply with Dc and there are capacitors inside, how will the current move?
     
  6. Nov 29, 2013 #5
    Thanks, guys
    If there is no negative pulse ,the whole circuit is only powered by Dc ,and there are capacitor inside, how will the current flow?
     
  7. Nov 29, 2013 #6

    NascentOxygen

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    Staff: Mentor

    This sounds like a homework exercise.

    It is a standard monostable multivibrator circuit. I am confident that a google search will
    find its operation well-described. http://img811.imageshack.us/img811/5412/thgooglefriend1.gif [Broken]
     
    Last edited by a moderator: May 6, 2017
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