home laser security system..?

Posted by admin on Feb 27th, 2010 and filed under Home Security Systems. You can follow any responses to this entry through the RSS 2.0. You can leave a response or trackback to this entry

in this project, i have several questions to ask..http://www.instructables.com/id/SYTR52PFD80BUX9/

1. if i replace the laser with a 3v LED, do i still need to use a 3.2 ac adapter? the same if i replace it with an ordinary laser pointer.
2. Refer to the schematics, i don’t why form the 9v battery go out 3 wires (in fact, it has only 2 wires….1 for+ and 1 for -)
3. For the 3.2v ac adapter, can i replace it with an adapter like this one? http://www.ccrane.com/images/medium/universal-ac-dc-adapter.jpg

also, please give some suggestions to build the circuit easier… thanks in advance =^_^=

1 Response for “home laser security system..?”

  1. Peter H says:
    February 27, 2010 at 5:55 pm

    I don’t think this is a very responsible project at all, given the risk of injuring your eye permanently if you look into the laser, and you are quite right, the circuit diagram is badly drawn. This sort of thing can be done with much safer infrared LEDs, but you will then have the problem of focussing the LED beam.

    Commercial home security systems are much better engineered, and if you are really concerned with your home security, I would go out and buy one. If you are just interested in playing with the electronics, then email me for safer ideas.

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