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barrel racing timer


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hi everyone, it's been quite awhile since i took an electronics class and i wasn't
all that good at it to begin with, so i'm seeking some help from all you experienced folks here.  i am looking for a schematic on how to build a timer for barrel racing-(an timed equestrian sport) It would consist of an infared light that once broken would start a timer.  The timer would turn off once it was passed again.  I called radio shack to give me a hand with this and the sales man assured me it could be done, but he didn't have the slightest idea how.  He told me if someone had a schematic that we could surely build it.  i'm including the
web address of one in case that helps anyone. http://www.countrysupply.com/products/sku-WRA10__dept-19.html
now, can anyone help me out?
thanks, cin

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