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How to make a Laser Tripwire Alarm Circuit on a Breadboard [HD]
How to Build a laser tripwire that can trigger anything out of a photoresistor « Hacks, Mods & Circuitry :: Gadget Hacks
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How to make a Laser Tripwire Alarm Circuit on a Breadboard [HD]
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How to make a Laser Security Alarm System at Home on a Breadboard [HD]
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