<a href="https://teachbesttech.org/best-fiber-optic-christmas-tree/">https://teachbesttech.org/best-fiber-optic-christmas-tree/</a>

Recall, timing sensors are triggered by the disruption Best Fiber Optic Christmas Treesof a photocell. Lining the drag strip at strategic locations are photocells that project an invisible beam that contacts a reflector (the orange cube) on the center line. The disturbed beam triggers the timing system. The stage light (second set of yellow incandescent bulbs