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How to make a simple laser security alarm system, step by step video. You can see the circuit of this project at 00:54 What components you will need: 1. two MOSFET transistors 2N7000 2. an active 12V buzzer (or 5V active buzzer) 3. a light dependent resistor LDR07 4. a button. 5. an LED. 6. […]
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