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. 1K Ohms resistor.
7. 470 Ohms resistor.
8. wires.
9. a 5V DC power supply.
Although I use a 12V active buzzer, it works perfectly with 5V as well.
You can use a 5V active buzzer without any problems, it would be even better.
IMPORTANT: Don't use a power supply with higher than 5V output !!!
If you have any questions ask in the comments below.
