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How To Make Anti Theft Alarm System for Bike || Bike Security system Using BT136 Triac 

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Anti theft Door Sensor Alarm Open Burglar Alarm with Magnetic Door and Window Alarm Sensor for Kids

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How to make Laser Security (Theft) Alarm using SCR - 1 KM Range

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DIY High Frequency Anti-Theft Alarm with Laser Sensor | BT137 TRIAC + TIP31C Transistor Circui