Timer 555

Discussion in 'Homework Help' started by ac_dc_1, Jan 27, 2013.

  1. ac_dc_1

    Thread Starter Member

    Jan 27, 2013
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    0
    Hi

    I am trying to draw the wave forms(V output and Vc1 capacitor C1) of the circuit..What does this circuit do?It generates a pulse with constant size?
    How can i determine the frequency of oscilation and the duty-cycle of the output tension?

    Thanks
     
  2. tracecom

    AAC Fanatic!

    Apr 16, 2010
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    Are you speaking of an astable multivibrator or a monostable? Post a schematic.
     
  3. ac_dc_1

    Thread Starter Member

    Jan 27, 2013
    74
    0
    Here´s a schematic of the circuit
     
  4. tracecom

    AAC Fanatic!

    Apr 16, 2010
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    It's an astable multivibrator. What determines the duty cycle and the pulse length? Do you know the formulae, and do you know what effect D1 has?

    And by the way, pin 4 of the 555 should be tied high when it is not in use.
     
  5. ScottWang

    Moderator

    Aug 23, 2012
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