Question about Hertz
by Cy on 01/20/03 at 12:56:32

I was just thinking about a LED to light up at a certain RPM in my car.  I used the conversion page to convert 4000 rpm to hertz and it came to be 66hz.  I want something that tells me that it's 66hz and sends me a positive signal for the LED.  Does anybody know what is needed to be done??  Is there other ways?

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