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Published on 12 Nov 2013 | over 4 years ago

Let's make simple laser alarm security circuit. This circuit is very easy.
Materials : Breadboard, Laser pointer (From laser ballpoint pen), CDS, 2n7000(FET), BT169(SCR) 6.8kΩ Resistor, 5V buzzer, LED, 100Ω Resistor, 16V 1μF Electrolytic capacitor.

This clip offers momentary mode or continuous mode circuit.
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