duty cycle control

Discussion in 'General Electronics Chat' started by king40, Jan 11, 2014.

  1. king40

    Thread Starter Member

    Jul 17, 2013
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    0
    hi engineeeeering and friends
    i searching for duty cycle control circuit
    but i cant found :(

    this is possible to change duty cycle without ferquency change :( :rolleyes:

    [​IMG]

    thanks
     
  2. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
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    Is this for an automotive performance modification?

    That's the primary use for duty cycle changers these days, to fool the car's fuel injection or ECU to make it give more fuel etc.
     
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  3. king40

    Thread Starter Member

    Jul 17, 2013
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    thanks RB
    no this not automotive performance
    just exam :rolleyes:
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Check Fig 18 of the Texas Instument datasheet for the NE555 timer IC.
     
  5. MrChips

    Moderator

    Oct 2, 2009
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    This is a job for a monostable multivibrator.
     
  6. king40

    Thread Starter Member

    Jul 17, 2013
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    Thanks mr
    You can Explain more or give me circuit
     
  7. MrChips

    Moderator

    Oct 2, 2009
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    Look up monostable multivibrator.
     
  8. king40

    Thread Starter Member

    Jul 17, 2013
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    fig 18 is:

    [​IMG]
     
  9. ScottWang

    Moderator

    Aug 23, 2012
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    Setup the delay time of NE555 less than T(=1/Freq) of your Fin(input frequency).
     
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  10. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Must be a different revision of the datasheet. In mine, Fig 18 relates to PWM.
     
    Last edited: Jan 11, 2014
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  11. king40

    Thread Starter Member

    Jul 17, 2013
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    many thanks of all
     
  12. Gibson486

    Member

    Jul 20, 2012
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    nm...misunderstood question....
     
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