Mechatronics Projects

Help Required For Tachometer Circuit...

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


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Syed Zain Nasir

I am Syed Zain Nasir, the founder of <a href=https://www.TheEngineeringProjects.com/>The Engineering Projects</a> (TEP). I am a programmer since 2009 before that I just search things, make small projects and now I am sharing my knowledge through this platform.I also work as a freelancer and did many projects related to programming and electrical circuitry. <a href=https://plus.google.com/+SyedZainNasir/>My Google Profile+</a>

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Syed Zain Nasir
2 days ago