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Arrow Chronograph Circuit

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bledsoam

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I am doing a project that involves detecting an arrow shot from a bow over 2 photo transistors. I was looking for ideas on monitoring the current under normal conditions, and checking for a change, when the arrow passes over it. Any help is appreciated. Thanks
 
I have no knowledge of archery.

To determine the requirements for a system as you suggest, could you say what the speed of the arrow is?
 
The speed of the arrow will be around 250-300 feet per second. I am using L14G2 phototransistors which I purchased from a company that makes the entire system. The actual circuitry though was not available.
 
Race Timer

I just stumbled across the following - could be a starting (sic) point?

**broken link removed**
 
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