HOW TO MAKE A LASER TRIPWIRE ALARM!?
In this video I am going to make my own "laser alarm. I do this with an LDR, BC547 transistor, buzzer, 2k ohm weather stand and a laser. As power supply I use a usb cable.
Supplies:
LDR
BC547 transistor
buzzer 5v
2k ohm resistor
laser
Usb cable 2x
Schematic: https://robbemaaktdingen.blogspot.com/