Monday, November 28, 2011

Dummy Security System -Sponsored by Farnell.com

You own an old car and would like to scare off thieves? Build your own fake security system!


I got all the parts i needed from Farnell Electronics! Also check out Element14!

Parts Required (All available @Farnell.com)Check out the links next to the components!


  • resistors: 1k, 10k, 680k   Resistors
  • capacitor: 10µF radial   Capacitors
  • LED: red superbright, 5mm diameter  LEDs
  • 7555 low power timer IC  7555
  • 8-pin DIL socket for IC
  • battery clip
  • 4.5V battery box for 3 AA cells
  • stripboard: 8 rows × 16 holes  Stripboard 
This Dummy Alarm project makes an LED flash briefly once every 5 seconds to imitate the indicator light of a real alarm. The circuit is designed to use very little current to prolong battery life so that it can be left on permanently. An on/off switch is not included, but could be added if you wish.  
See the whole circuit after the break:

The components I received from Farnell

All you have to do now is soldering together the components according to this circuit:



After soldering everything together it looks like this:

You can put this little circuit into a black hobbybox, add some batteries and place it inside your car! The flashing red Led will hopefully scare off thieves and protect your precious car!
I hope you enjoyed this little and simple how to!
Come back for another tutorial on how to build a simple fast flashing Led circuit!
The parts were sponsored by Farnell.com
Thank you very much!

Here's a little video if you're interested:


8 comments:

  1. Ahah! Nice trick! that will get the thieves away from your car. Reminds me when i got a window broken and they stole some of my stuff. Anyway, looks like you got a good feedback from farenell, i might buy the same pieces to (try to!) re-create the same thing! thanks for showing!

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  2. Great post; I did something similar to this in school once, but this is obviously more complex than that ;D

    Also congrats on the sponsor man, if anyone deserves it, it's you and your engineering mind.

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  3. great instructable! I'm not that into electronics but that seems to be pretty easy stuff! Also thanks for the links to the great shop +1 ! I'd never have known where to purchase these!

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  4. Hey, that was pretty easy to rebuild!! And farenell delivered the parts in good time, i didnt have to wait long for them :)
    Thanks for the tutourial-vid, it was very helpful!

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  5. This is amazing. I am not a graduate of electronics whatsoever but you've given me an idea on how to make my own useful gadget. This will surely save cars from getting stolen. CCTV Bristol

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  6. Nowadays, even how careful you are, there are some people who just love doing things, like those robbers glaring at your cars. With this, rest assured I can park my car with ease of mind.


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  7. This is a good trick, however, I hope it can catch the thieves' stupid minds. It is good to have such security dummies but having a real security is more important especially in your properties. Conveyancers Darwin

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  8. Its definitely not highly advisable to do some fake type of security of your place. You should hire a professional to do these things.

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