555 timer help

Discussion in 'Homework Help' started by ///m3dave, Dec 9, 2009.

  1. ///m3dave

    Thread Starter New Member

    Dec 8, 2009
    23
    0
    What is the formula to figure out the resistor value in a 555 timer?
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    It depends upon how you connect the timer up!

    The basic configuration for an astable multivibrator is R1, R2, and C1.

    Go to National Semiconductor's website: http://www.national.com
    and download a datasheet for the LM555.
     
  3. ///m3dave

    Thread Starter New Member

    Dec 8, 2009
    23
    0
    if I have a pulse generator with a 10kHz and a duty cycle of 80% and a capacitor of 0.01uf. what would the formula be for finding the resistor values?
     
  4. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    I am not quite sure what you mean. Please refer to the formula you plan to use.
     
  5. mkbutan

    Senior Member

    Sep 30, 2008
    270
    16

    if I have a pulse generator with a 10kHz and a duty cycle of 80%
    i think it is an output

    pl ref this :-
    http://www.national.com/ds/LM/LM555.pdf
     
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