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Help Required For Tachometer Circuit...

Discussion in 'Robotics & Mechatronics' started by Airian_007, Jul 4, 2014.

  1. Airian_007

    Airian_007 Member

    Joined:
    Oct 17, 2009
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    Hi,
    I am trying to build a tachometer using IR Sensors..
    I get good response at lower frequencies but as the frequency increases say to 170Hz it looses the wave..
    i am using a hysteresis resistor of 1M at positive feedback and input is at inverting terminal of op-amp should i use hysteresis resistor i think the problem is with this as the frequency increases..
    and if i remove the resistor response is so fast and ir sensor is imune to even little jerks..
    Plz Someone give expert opinion.
    Thanks In Advance
     
  2. ronsimpson

    ronsimpson Well-Known Member Most Helpful Member

    Joined:
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    A picture is worth 1000 words.
    Can you give us a schematic?
     
  3. alec_t

    alec_t Well-Known Member Most Helpful Member

    Joined:
    Jul 10, 2011
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    Location:
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    Which IR sensor are you using? Can you post a link to its datasheet?
     

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