ASRA - Australian Skateboard Racing Association

simply a 12-24v infrared beam sensor barrier detector set
Mounted in boxes with 2 x 9v battery and switch, with fly lead to timer

Cost around $40 each gate

Search ebay for "12-24v infrared beam sensor barrier detector"

https://www.facebook.com/groups/4236634 ... 057637317/

Image 2 - DC12-24V Active Photoelectric Single Infrared Beam Sensor Barrier Detector K#AU

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https://www.ebay.com.au/itm/393242387235/ The link is already broken, and that's too bad, I wanted to buy one. 

Jack,

Search ebay for:

12-24v infrared beam sensor barrier detector


Jack Goldman said:

https://www.ebay.com.au/itm/393242387235/ The link is already broken, and that's too bad, I wanted to buy one. 

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