Home-made alarm system device website

[EddyPach]

CAn you please tell if there is a website where I can find a diagram to build a home-made alarm system? There may also be a kit to build. What is a cost-effective solution based on, diaphragms, infrareds, motion detectors?
Thanks for the info.

 

[Ben537]

Are you look to build an entire system or just the main control components? To be honest you can normaly purchase security components (i.e motion sensors, door contacts ect) from a security wholesale company for a fraction of the cost of a pro install.These are the companies most security contractors buy from. I don't know any websites but I hope this helps.