The general block diagram of the four quadrant detector with processing... | Download Scientific Diagram
Simple laser security trip wire alarm circuit | Home security systems, Wireless home security systems, Security alarm
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EFY's Electronics Design Community - CIRCUIT: Intruder Detector Using Laser Torch http://electronicsforu.com/electronicsforu/circuitarchives/view_article.asp?sno=1258&article_type=1&id=1082&tt=unhot&b_type=new#.VFsNLMlIg2w Here is a simple, low-cost ...