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Published on 02 Jan 2013 | over 5 years ago

This video will show you How To Make A Laser Security System in easy steps.
The things you need are :
*2n3904 NPN Transistor
*5K Variable Resistor
*1000uF Capacitor
*LDR (Light Dependent Resistor)
*3-12V Siren
*9V Battery
*9V Battery Clip

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