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Old 12-26-2007, 06:01 AM
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Default Simple (no solder or resistor) LED light

I posted this within my baby demon thread but I think it has many applications that some of us would find useful. So I'm posting it as a stand-alone how-to.

Here's a no brain simple LED you all can use. No soldering, no resisters or anything.

All you need is a CR2032 Lithium battery (can buy at any jewelry counter at stores like wal-mart and such. I got a 5 pack for under $4 off Amazon), a 10mm LED light (I bought a pack of 100 of them for under $6 on ebay), some paper and tape. As with all things, if you buy in bulk, you get a better price.

Here's a pic of the part list...



I cut one piece of card stock paper (like an index card) in a square to roughly fit the battery and another as a thin long strip.

Notice that the LED wires has one short and one long one. The short is negative and the long one is positive.

Place the wires of the LED onto the battery with the short wire on the neg side of the battery and long one on the positive side (the side with the wording on it is the pos side. It will have a + on it). The LED will light up.



Place your long strip of paper under the negative wire between it and the battery. This will cut off the circut and turn the light off...



Then place the square paper over it...



While keeping the pieces of paper in place, wrap a piece of tape around the whole thing (battery, paper and wires)



When you pull the long slip of paper out, it turns the light on. You can place it back in to turn it off.

And there you have it. A simple LED to make your icky things glow.
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Old 12-26-2007, 08:28 PM
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thanks cassie7, never thought of that, I always soldered, great idea!!
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Old 12-27-2007, 03:31 AM
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Someone on another forum asked me about the battery life. I have read that it's supposed to last about two weeks but I'm doing my own test. I lit one last night at 10PM EST and will let you all know when it dies
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Old 12-27-2007, 08:52 AM
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I see the battery is 3v. What is the voltage rating of the LEDs you buy?
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Old 12-28-2007, 09:45 AM
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Honestly, I don't know.
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Old 12-29-2007, 02:43 PM
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Well, whoever said that they last about two weeks was daft unless they turned them on for only a few hours each night.

I lit one at 10PM on Wed night and today at 5PM (Sat), it's visually on it's last legs after running 67 hrs straight. If you look at it, you can still see that it's lit but when I first fired it up, it cast a fairly bright beam of light on the wall about 2 feet away. I see no light on the wall at all now.
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Old 12-30-2007, 12:05 AM
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Well, sounds like if you ran it for 4 hours each night (6:00 - 10:00), it would last a couple of weeks. What more could you ask for? I still like the idea and will probably use it next year. Thanks!
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Old 12-30-2007, 12:13 PM
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Mine is still glowing faintly
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Old 01-02-2008, 10:45 AM
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Thanks for helping those of us who are lazy and/or technologically challenged.
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Old 04-03-2008, 08:54 PM
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I saw someone doing this with magnets. They were using them to throw on metal buildings and bridges. If I saw that stuff, I would ask the city if I could remove them. Look ma, free LEDs!
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