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-   -   building a hand held tachometer (http://www.chiefdelphi.com/forums/showthread.php?t=31129)

Ben.V.293 07-11-2004 12:10

building a hand held tachometer
 
i do alot of work with small engines and i have been looking into buying a non contact tachometer but i cant find any for less than $200. I was wondering if it would be possible to build one useing a light sensor. I'm just uncertain as to how to convert the pulse from the light sensor into numbers on a display. Any help would be greatly apreciated.

Thanks,
Ben Van Selous

Al Skierkiewicz 07-11-2004 18:00

Re: building a hand held tachometer
 
Ben,
There are number of circuits out there if you search for them. It is possible to use a light sensor with a light source. Once you get that far you need to filter the signal to cancel out the noise and then send that to a counter. Add to that a semi accurate time base and all you need to do is to interface your results to a display of some sort. When you add up all that is needed, one of those tachometers in McMaster Carr looks pretty nice.

ChuckDickerson 07-11-2004 18:28

Re: building a hand held tachometer
 
Have you checked out the ones Harbor Freight has for $70? I have seen them on sale for $60 at times.

Photo Sensor:
http://www.harborfreight.com/cpi/cta...emnumber=41727

Digital Touch:
http://www.harborfreight.com/cpi/cta...emnumber=41726

Ben.V.293 07-11-2004 18:48

Re: building a hand held tachometer
 
Thanks for your help. mayby i will just buy one. I was just wondering if building one was a possibility.

Thanks,
Ben Van Selous


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