Instructables

Step 1: Materials List

LED throwies consist of only a few inexpensive parts and can be made for ~$1.00 per Throwie. You can reference the parts list below or download the attached spreadsheet for more info on parts, part's numbers, vendors and application notes.

Part: 10mm Diffused LED
Vendor: HB Electronic Components
Average cost: $0.20 avg per LED
Notes: Cost reductions for larger quantities. Comes in red, blue, amber, white in both diffused and clear. Diffused works better than water clear for the Throwie application. HB has even created a Throwies packs page with deals on 10mm LEDs and lithium batteries!

Part: CR2032 3V Lithium Batteries
Vendor: CheapBatteries.com
Cost: $0.25 per battery
Notes: Cost reductions for larger quantities. With the 2032 Lithium batter, depending on the weather and the LED color, your Throwie should last around 1 -2 weeks.

Part: 1-inch wide Strapping Tape
Vendor: Your local hardware store
Cost: $2.00 for one roll
Notes: One roll will make many throwies

Part: 1/2" Dia x 1/8" Thick NdFeB Disc Magnet, Ni-Cu-Ni plated
Vendor:Amazing Magnets
Cost: $13.00 per 25 magnets
Notes: Cost reductions for larger quantities

Part: Conductive Epoxy
Vendor: Newark In One
Cost: $32.00
Notes: The epoxy is optional.
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miamibeach1 year ago
slullin says: Mar 28, 2012. 9:29 AMReply
if your leds are 3volts and 0.02 amp,

0.02 x 20leds = 0.4amp per hour

0.4x24 hour per day = 9.6 amp on 3v for one day,

if you have a battery pack, 4AA batteries, 6volts, and the best amp possible (actually 2.7) , you can hold around 13hours,

with a car battery(12v 60Amp) , with 5x4 leds, you can hold 25,71 days

(12*60)/(9.6*3)

hope that it's right, and that it helps you ;-)
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This is the answer I was looking for. It last enough to cover whole holiday season.

Hakan@South Beach
LED throwies looks very beautiful and colorful too. We can use it to decorate our house.
mappsolutely
The main feature of LED is it is not expensive. It can be used for special occasions too.
mappsolutely
miamibeach1 year ago
Amazing instruction! It will help me to make Christmas decoration. I wonder how ling those batteries last. Tanks
m3harri1 year ago
How long will 2032 run the LED?
coverhiser1 year ago
Yea this is very surprising description can be very accommodating to public. Buckyballs
Is the epoxy necessary to fixate the bulb to the battery, or will a simple point connection work, if it's well adhered by tape or something? Love the concept and am going to use it as a hidden lighting method in a model I'm designing.
Does anyone know if i can do this LED thing with a larger battery so that i can run at least 20 lights for 4 weeks? can i use any battery?I have an art show that will up for a month and i want to light something up that does not have a power source nearby.
if your leds are 3volts and 0.02 amp,

0.02 x 20leds = 0.4amp per hour

0.4x24 hour per day = 9.6 amp on 3v for one day,

if you have a battery pack, 4AA batteries, 6volts, and the best amp possible (actually 2.7) , you can hold around 13hours,

with a car battery(12v 60Amp) , with 5x4 leds, you can hold 25,71 days

(12*60)/(9.6*3)

hope that it's right, and that it helps you ;-)

Yea this is very surprising description can be very accommodating to public.

Bollywood Movies 2012 // Movies 2012
wow! talk about a viral instructables! +1!!
snow28013 years ago
how can they be a temporary alteration? They will still be there even when the battery has run out as the magnet will hold them in place, they could be too high to be removed.
ilpug snow28013 years ago
big deal.
I like this posting.e urdu point
scottz29 ilpug2 years ago
If I was a landlord, I certainly wouldn't want to clean them off my building, but hey, no big deal to you...
asadkhan121 year ago
I certainly wouldn't want to clean them off my building, but hey, no big deal to you...e urdu point
This has made me laugh so much. I have never seen the use of a 'Throwie' but wondered if anyone had combined the popularity of LEDs with Neodigm magnets, and this was the first thing that came up.
Fend19521 year ago
LED Fun, first image is amazing.

Now i have a project to wokr with
dada111 year ago
hi!,
I'm new here and I want to learn how to make a solar throwie. can someone teach us?. thanks
So Bright and cool
JuriusV1 year ago
Hello
Just wondering of you NEED to use an rare-earth magnet or if you can use an simple magnet
Would want to make one but dont know where to get those magnets because I live in UK
This was a perfect first electro/magnetic/led project! Opened up a whole world of un for me! Thanks.
RelientOwl3 years ago
Uh, how  long do they last?
 
LEDs last a VVVVEEEERRRRYYY long time; but the battery (being a coin CO2032) likely won't. It said in the article ~2 weeks of life. DIDN'T YOU READ IT???
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OT4 nadina1 year ago
This site is using other peoples.designs. if im wrong im sorry.
Did you actually just link to your own website trying to sell something based on someone else's design?
that is very cool!
(removed by author or community request)
some one must make automatic catapults and then throwie war
orsd1 year ago
IT would be fun to place these in Jell-o
I should use those lights for my Christmas tree..xD
kilves762 years ago
If you pulse the led for example 60 times per second instead of continuous current, the battery will last many times longer yet the light stream will appear continuous to humans... there was a schematic about making a miniature led torch that works on this principle somewhere.
epsilakis2 years ago
Hi, I'm trying to create these for lighting at my wedding reception. I plan on inserting them into paper lanterns. The reception is going to be held outside, and I'd love for the lanterns to light up as the sun starts to set. Is there a way to have them start to light up when it's getting dark?

And if not, what do you think would be the best battery to use to keep the LED throwies lit for over 12hrs?

I'm really new at these things, so the best terms to use, would be the basics. I'd appreciate it if you could even point me in the best place to buy what I would need to make them light up at dusk.

Thanks!
Here ya go: http://www.evilmadscientist.com/article.php/nightlight
sorry... here ya go with the link: http://www.evilmadscientist.com/article.php/nightlight
ncunico2 years ago
What I need to know is, can a tiny wireless switch be made to turn this on or off. I am making a terminator appliance and need to be able to turn it on or off. It needs to be tiny to also fit under the appliance..
"Note that the positive terminal on the battery has a larger contact surface than the negative terminal. The positive terminal extends around the sides of the battery. Don't let the cathode lead of the LED accidentally touch the positive terminal of the battery. This will create a short and cause the LED to function improperly."

Is this particularly common? I'm hoping to let people choose their own colors for an LED project, so I'm not intending to attach all LEDs to a battery in advance of the project.
If you know any good tricks to avoid letting the cathode lead from contacting the positive side of the battery, what are they?
(removed by author or community request)
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