555 Timer Project help request

Discussion in 'General Electronics Chat' started by kushal.., Mar 29, 2009.

  1. kushal..

    Thread Starter New Member

    Mar 29, 2009
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    0
    How to make 555 timer as bistable mode....please reply
     
  2. hgmjr

    Moderator

    Jan 28, 2005
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    In the future, please take the time to start your own thread. Otherwise confusion will ensue.

    hgmjr (moderator)
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Like in the attached schematic & simulation.

    As bistable, it acts as a Schmitt trigger.

    For simplicity, I used 9v for Vcc.

    Note that when the input signal crosses the thresholds (1/3 Vcc, 2/3 Vcc) the output toggles states.

    Note that the output of a bjt 555 will not actually approach Vcc; it'll be 1.2v to 1.7v lower.
     
  4. Wendy

    Moderator

    Mar 24, 2008
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  5. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    Why don't NOOBs look at the datasheet?
     
  6. Mike2545

    Active Member

    Mar 26, 2009
    116
    3
    Hi Audio!

    Because they are in the "discovery phase"

    Mike2545
     
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