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Help Required For Tachometer Circuit...

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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
 

alec_t

Well-Known Member
Most Helpful Member
Which IR sensor are you using? Can you post a link to its datasheet?
 
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