Introduction: Laser Alarm

Picture of Laser Alarm

To make this simple alarm not even need more time. Yes we should have an NPN transistor that I have chosen them BC547, a rsistor100k and a consumable that you should inform you of any cases dagger .But I also used a plate with two transistors to pass on the issue of sound stood is you can even without the sign that can function.

Step 1:

Picture of
  • Here you have been given schematic for a better information

  • Here's what else you need.

  1. transistor NPN
  2. resistor 100k
  3. buzzer,led etc
  4. pcb and bred board for testing


smandal13 (author)2015-08-15

How did you make the connections of the buzzer?

electronici (author)smandal132017-01-17

led paralel connect buzzer

neurici (author)smandal132016-11-12

connect the buzzer in paralel with LED!

electronici (author)neurici2017-01-17


About This Instructable




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