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Thread: AA powered led kits

  1. #1
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    AA powered led kits

    im looking to make a fake car alarm to go in my motor, as there has been a few brake ins where i park at work, just wanted to have a small black plastic case with a
    AA battery in that flashes every now and then, any of you guys have any ideas?
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  2. #2
    jim
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    Re: AA powered led kits

    There's an American one called "Auto Theft Deterrent Light" but I wouldn't exactly call it convincing.

    There are a few places doing a little kit, like Maplins, which at least gives you the opportunity to make it look more realistic.

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    Re: AA powered led kits

    you would be better doing a little DIY job with a 12v flashing blue led so it looks like a car alarm.

    all you need to do is find a 12v source like the ciggy lighter and tap into that, then stick a 5mm LED in a switch cover/blanking plate

    http://cgi.ebay.co.uk/Pre-Wired-Flas...item45f0dc801f

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    Re: AA powered led kits

    Last time Tesco had a display on for Lucozade with about 15 flashing little lights on, powered by a CR2032, they arranged to give me them when the display was disposed of. The LED was replaced with a red one, the sole resistor on it controlled the flash rate, and it works fine for about 4 months per tidgy battery

    Not much use for you now, but I thought I'd share anyway

    edit: hmmm I think I actually have some spare....

    edit 2: yep, I have 4 spare. Replace the x1 3V CR2032 with x2 1.5v AA batteries and it would work fine and last for a year or so.

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    Re: AA powered led kits





    You'd need an x2 AA battery holder, a box/enclosure of your choice, hot glue gun, probably some thin wire (I have some you can use) and a suitable red LED which you can scavenge from any old electical scrap, and some resistors if you wanted to mess with the refresh rate of the LED - I used three of the same resistors to slow it down enough to just be noticeable during a peek-in-car-to-see-whats-in-it moment. I can measure the resistance of 1 if you can't tell from the colour coding. Perhaps also a switch, but I dont find it at all annoying at night.
    Last edited by smargh; 09-02-2010 at 08:37 PM.

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