He shows the schematic in the video with the components and how to hook it up.

I think you can buy these parts from Radio Shack.
102dB piezo siren
NPN Transistor 2N3904
1000uf Electrolytic Capacitor - this is polarized
9V battery
LDS Photocell resistor
5K ohm variable resistor aka potentiometer
perfboard to mount components
2 project boxes
Single pole single throw (SPST) switch
cheapest soldering iron that runs on household current
Solder
Flux

All this can probably be online for less.



And from mfgcn.com

AixiZ Power Adapter 3.2VDC Output;
[A-PS-32-500m]

635nm 5mW Laser Module 12x30mm
[AH635-5-3-12]

This is pretty cool, but doesn't really give enough information for people who have never made any electronic projects.

I think you would be lucky to do it for less than $40. Just the laser module and power supply from mfgcn.com is going to run over $20 after shipping.

If you want to try it and have any problems post back here and get the help to fix it. I'm not an expert but I think this is easy for the folks on here.

Also, does anyone know if a laser pointer can be hacked to run continuously for this?
And can't an old 5v power supply for a cell phone be used with a resistor for this instead of buying one?

Pls i need help with my project,i was asked to build a system against intrusion using an ldr,monostable,astable.then incase of intrusion a lamp will blink and a buzzer will sound.
pls i will be happy if i can jst get how the circuit will look like

 

Post #1 schematic makes no sense, prob. same as post #4, same cost.
Found a laser module on Electronic Goldmine, G 19D31 , or maybe D is 0 ?, @ US $ 2.29, same with battery, G196D1 . Also a laser target kit which seems to have all of your receiver parts except for siren , C 6739 @ $7.50. I think they have a $ 10. minimum.
It is G19031, G19601 @ $ 1.99, also wall wart [ AC adapter ] G19115 6V, 500 mA, @ $ 2.99, add 100 ohm in series.

Pls i need help with my project,i was asked to build a system against intrusion using an ldr,monostable,astable.then incase of intrusion a lamp will blink and a buzzer will sound.
pls i will be happy if i can jst get how the circuit will look like

 

Hello,

You just hyjacked an existing thread:
Laser Alarm System Help

This is not allowed over here and I moved your post to a thread of your own.

Bertus