Make Your Very Own Laser Burglar Alarm

This is one of the common projects made using lasers .its cheap ,reliable ,safe and most important of them all handy to protect all your things.

according to the image
1 photocell or LSR or LDR (as you call it) x1
2 5k variable resister x1
3 2n3904 transistor x1
4 1000uf 35v capacitor x3
5 speaker
6 9v battery x1
7 button cells x4
8  9v battery clip x1
9 most important of them all laser diode
10 vero board or circuit board

solder all components and ensure that all the capacitors are arranged in series and not in parallel and this is how it should look like
 The 9v supply is for the circuit and  4 button cells  for the laser diode
you could use duct tape to secure the switch of your laser diode




have loads of fun!!!!!!!!!!!!!!!!!!!