LED throwies are so populear that this happend. i serched for LED on google. Light-emitting diode - Wikipedia, the free encyclopediaA light-emitting diode (LED) /ɛl.i.ˈdiː/ [1] is a semiconductor diode that emits incoherent narrow-spectrum light when electrically biased in the forward ... en.wikipedia.org/wiki/Light-emitting_diode - 153k - Cached - Similar pages - Note this Howstuffworks "How Light Emitting Diodes Work"Light emitting diodes form the numbers on digital clocks, send data from remote controls and light up traffic signals. Find out how LEDs work. electronics.howstuffworks.com/led.htm - 62k - Cached - Similar pages - Note this SUPER BRIGHT LEDS homeOffer LED products and components including replacement bulbs and circuit boards. Includes detailed specifications and wholesale information. www.superbrightleds.com/ - 4k - Cached - Similar pages - Note this TheLEDLight.com is everything LED. Find loose LEDs, LED controls ...TheLEDLight.Com stocks a variety of low voltage (12vdc or 24vdc) LED lighting products such as under cabinet lighting, LED bulbs, LED fixtures, ... www.theledlight.com/ - 40k - Cached - Similar pages - Note this LED Circuitry tutorial: how to hook up LEDs.LED Circuitry tutorial: how to hook up LEDs. Text and illustrated instructions for setting up a circuit, what is series and parallel circuits, ... www.theledlight.com/ledcircuits.html - 15k - Cached - Similar pages - Note this LEDs Magazine - LED Technology, Solid State Lighting and other LED ...LEDs Magazine - LED Technology, Solid State Lighting and other LED Applications. www.ledsmagazine.com/ - 31k - Cached - Similar pages - Note this What is a Light Emitting Diode?What is a Light Emitting Diode Fundamentals of Physical Science Experiments by Experimentation ACEPT. acept.asu.edu/courses/phs110/expmts/exp13a.html - 8k - Cached - Similar pages - Note this LED Throwies - Instructables - DIY, How To, art, techDeveloped by the Graffiti Research Lab a division of the Eyebeam R&D OpenLab, LED Throwies are an inexpensive way to add color to any ferromagneti... www.instructables.com/id/LED-Throwies/ - 178k - Cached - Similar pages - Note this

Topic by dsman195276   |  last reply


New to site not sure this were to post this. Led's for ac powered model railroading, to replace incandescent bulbs.  Voltage to track varies from 5 to 17 volts AC.  Leds will light up, but what is it doing to them. They do not pop like a flash bulb at top voltage. I've rectified some to dc voltage for lights in cars, the variable voltage seems to power them. Ideally a circuit that put out a constant 3.2 DC volts, with a variable 5 to 17 volt AC input.  Or maybe would a constant 3.2 volt AC out would function? I found that with HO DCC control, a white led with a 1k resistor will function, have not ran them for more than few hours though. Prewired rectified leds go for around $3.00  each, 5 passenger cars, 2 bulbs each, gets pricey with 4 sets of cars. Surly someone has gone through this.

Topic by 31cssinc   |  last reply

Replacing LEDs on a LED fan? Answered

If the LEDs are the same voltage, can i just cut the wires on the LED fan, and just simply re-solder the new LEDs onto the wires? I have been looking at several Instructables about replacing the LEDs on a fan, and they all have complicated re-wiring ideas..Can't you just simply replace the LEDs with the news ones?

Question by ramroids55   |  last reply

led values Answered

All i want is a list of led voltage and current values, you would think this a simple task,not so.They are few and far between and when you do find some they all contradict.

Question by johnm56   |  last reply

LED Contacts

What is the best way to affix an LED contact to a watch battery without soldering it and risking damage to the battery? Help

Topic by ropor   |  last reply

LED question

I just bought some LED's that i plan to run through a wire on a 9 volt with a push button on/off i plan to run 6 at a time. the green are 525nm 8000mcd and the blue (A SEPARATE SET) are 472nm 2500mcd

Topic by pbpenguin5   |  last reply

led switch

My dad is redoing his basement and he wants to have a panel of switches with leds above them.  so that when the switch is on the led above it is on to.  does anyone know how to do this?

Topic by tic tac man   |  last reply

LED cube

Dear Sir, We are a marketing company in Saudi Arabia . We are interested in buying a customized LED cube for a project that we are handling now. The LED has to be one meter in length and one meter in depth and 2.5 meters in height. Please let us know if it is possible to build it and give us a quotation on that. Regards, Amal Alsayegh Marketing and PR rep. Zone Arabia amal@arabiczonesa.com

Question by AmalZone   |  last reply

Diffused LED

Hello, I am working on a lighting project. Right now I have a typical yellow LED (like so http://www.sparkfun.com/products/532) mounted in a 5" tube. It is shining through a frosted acrylic sheet at the end of the tube, 2" away from the LED. it creates a circle of intense light on the acrylic that is about 3" in diameter and then some ambient light around it. Are there any LEDs that are designed to diffuse light more so that the circle of intense light would widen and be a bit less bright? Thanks, Ben

Topic by BHSilverman   |  last reply


Does anyone have any informational sites and or plans to wire up leds to scan back and forth like on the knight rider car?

Topic by autoflow   |  last reply

LED cube

Dear Sir, We are a marketing company in Saudi Arabia . We are interested in buying a customized LED cube for a project that we are handling now. The LED has to be one meter in length and one meter in depth and 2.5 meters in height. Please let us know if it is possible to build it and give us a quotation on that. Regards, Amal Alsayegh Marketing and PR rep. Zone Arabia amal@arabiczonesa.com

Topic by AmalZone   |  last reply

led matrix?

I want to build an led matrix for under 50 bucks that dose not use Arduino. is there any way to do it?

Question by knexinventer   |  last reply

Led help

I need help, i want to make a sign with 50 maby 60 Led's where can i go? i am a total beginner at this. thanks

Topic by timberman   |  last reply

blinking LEDs

I'm planning a sort of a Halloween Scavenger hunt. I'm planning to hide boxes along a wooded trail, each with a blinking red LED on top, which is what seekers would look for. I suppose that this is a super-simple question, but I've got no real experience in electronics. But I do work well with instructions. I would like to do about ten of these, so I would appreciate any advice on how to cheaply create a bunch of blinking LED beacons. THANKS!!!!

Topic by Purple Chez   |  last reply

LED advice

I'm trying to source some LEDs, preferably from a supplier in the UK I'm going to mount them on a power kite, so they need to be bright as possible, ideally with a wide viewing angle and low forward voltage - to keep the weight of power supply down. Also, I'm considering options of mounting LEDs in clusters or using a small diffuser (like a ping pong ball, but smaller) to achieve a 360deg viewing angle. Any suggested products or ingenious solutions would be welcome

Question by davidhw 

undervoltage LED

If you undervoltage and LED (by like .05 volts) you don't need a resistor, right?

Topic by guyfrom7up   |  last reply

led and resistorsa

With L.E.D's, are there any specific resistors i should use or would a 150ohm one be find and not give the resistor to much power and die?>

Topic by craig3   |  last reply

LED Diffusion

I am using a flexible LED strip to illuminate some leaves on a lotus leaf for our art car. The leaves are made out of bent tubing which is then covered in fabric. The issue I am having is getting the light diffused across the surface. These photos show the issue and in actuality it's not as bad as the photo make it look. I'm wondering what tricks people have for getting diffusion. I have use backlight film in the past when having a panel of LEDs but this strip follows the contour of my shape. Any thoughts? Cheers. Phil

Topic by filthyPhil   |  last reply

working with leds

HELLO i AM WORKING ON A PROJECT IN WHICH i HAVE TO LIGHT TwO SETS OF LEDS. One set of led is white ultra bright led and other set is normal 5mm led red & green. I need a circuit for the lamp which should switch on the white led for like 1hour and after that this white led gets dimm and other led (red & green) wil bright slowly. In the circuit the time for glowing white led can be adjustable with timer. After making this circuit ,I will connect it with timer so that I can adjust  the 1hours time and then it gets dimm. Please help me out in this circuit .I am searching from last one week but I couldnt find. Thanks in advance

Question by SanjaySingh   |  last reply

LED Strip

Hello everyone! I have one question. I have 5m of 12v RGB LED strip. How i can connect them to some type of power bank? Is that even possible? I am making porch swing stand and i would like to add LED strips to it. Thank you very much!

Question by DarkM14   |  last reply

LED Programming

Ok so...I want to program led lights to flash in secquence. See the attached image. I'm not good at programming and don't know much about microcontrollers...So...What microcontroler do I use...how do I program it? Sorry for the noob questions but i need help!

Topic by Joe426   |  last reply

LED mau5head?

What kind of LEDs would I need to make a replica of deadmau5's LED mau5head? I already know how to make a mau5head, I just don't know what I need for a LED head and how to install the LEDs. Links would be appreciated!

Question by XEblaw   |  last reply

LED focussing? Answered

How much can you focus a standard 5mm LED? (i.e how tight can you get the beam)

Question by .Unknown.   |  last reply

Wireless LED

Where can i get a transmitter for a wireless transmitter like this : http://www.zenreich.com/ZenWeb/motorcycle/riderlight.htmand how do i build something like that ?i need one for my brothers small battery powered scooter. i have most of it ready except for the transmitter, and i don't know what to do to make the LED's have a receiver.help !

Topic by mrcs   |  last reply

LED indicator

How should I drive an LED from a 38 volts power supply? The led wizard says I need a 1800 ohm, 2 watt resistor, but it also says' it'll disipate excessive heat. I recently took apart a surge protector and found that they drive an LED from a 120volt source by having a diode, LED and what appears to be either a 1 or 2 watt resistor. I need help driving an LED from a 38 volts power supply just as an indicator.

Topic by guyfrom7up   |  last reply

Bicycle LEDs

Hi Everybody, I have made a series of LED lights on my bicycle spokes, for driving at night. I use a 9 volt battery with 9 pieces of white LED 3.3 volts, which I connect each with a 330 ohm resistor 9 pieces 1/4 watt. its durability is approximately 30 hours later the lights dimmed, is there any way to be more durable ?

Question by pro5200   |  last reply

LED calculator

Is there an easy formula or an online calculator to figure out what type of resistor I would need to hook up to an LED to keep from blowing it? I know you can also have a string of LEDs and the more you use you won't need resistors. I'm just trying to figure out for different projects with different batteries, what the most efficient circuit would be. Also what does T1 3/4 mean? I noticed that on the 5mm LEDs. How does it differ from ones without a designation?

Topic by mrshow555   |  last reply

Led voltages

I have a small pile of salvaged LEDs from various burned up electronics (flashlights, old stereos, etc) and I am wondering if there is any way to figure out what the voltage requirements are for the led. if anyone has an idea how to find this out it would be of great help.

Topic by danlab   |  last reply

washing LED's?

I want to weave a rag rug, and include LED's in the rug. Ideally, I would like to weave the wiring and LED's into the rug so that they are concealed in the rug- and not removable. But most people like rag rugs because they are machine washable. If I were to soak a LED wired rug in soapy water, rinse by hand and only use the machine to spin the excess water out, then line dry the rug, would the LED's still work, or does water destroy them and the connections? Thank you for sharing your expertise!

Question by msthimble   |  last reply

LED Datasheets

   Whenever I'm working on circuit, I often find it helpful to view the datasheet for a certain component. This is especially helpful with transistors and IC's that I pull out of old electronic devices. Finding datasheets for those kinds of components is easy because the ID number is written right on it, but what I'd like to know is how to find datasheets for LED's. Obviously, they aren't going to have any numbers printed on them and most of the time, I don't remember the circuit board or store I got them from so how would I find the datasheet for one. You might wonder why I need a datasheet, but it's often important and/or useful to know the max voltage or current needed, as well as the lens type, amount of light emitted, etc. , especially on infrared or RGB leds. Any help would be appreciated.

Topic by spystealth1   |  last reply

Led light

I'm struggling understanding what im really needing and could use some guidance... I'm tring to build a underwater fishing light that has 36 3watt green leds.  I'm going to only be powering them when the engine is off and the batteries aren't being charges... it will run off a standard 12volt marine battery... the led specs are ' green (510-530nm):DC Forward Voltage:3.4V~3.8V Forward Current: 700mA'.  what would be the best way to power these leds... im assuming that I need to power in series groups of 3. but with such a wide voltage of 3.4 to 3.8... do I just shoot for the middle? do I use 12v in my calculation or do u use like a 12.5 or 13 like it sometimes checks.... Can I get by powering it with just resistors or do I need a led driver? I have entered my data in some of the calculaters online and it says I need a 2.2 resister but gives warnings... and doesn't say what watt resistor... does it matter... first project ... confussed to say the least thanks

Topic by laltec   |  last reply

LED burnout

I've been having trouble with LEDs. I'm running 18 blue ultrabright in parallel. The specs for volts and amperage are as follows: 3.6v typ 4.5v max 20ma typ 30ma max Each LED has a 220 ohm resistor which was calculated for a 9v source with each LED at 4v, 25ma. This seems well within their range. But, in about a year and a half's time, I've had about 25% burnout. Most of the others are showing signs of intensity and spectrum degradation. Any thoughts as to the cause of this?

Topic by hexedene   |  last reply

Powering LEDs?

What I am trying to do is built a LED board that beats to music.  I have found many way to make it beat to the music, but my problem is I don't understand how to power the LEDs.  I am new to building electronics, and I am still learning.  Anyways, what my hope to do is use build a board 46in long running one LED per inch.  This will be dived up into smaller sections to run different beats off my home theater system.  I am trying to run all of this using  4 TIP31c, and I understand how to use them, I just am not sure how to power this.  Thank you!

Question by Togroovy4u   |  last reply

LED reflectors? Answered

Why don't they make LEDs without the reflectors? I find that LEDs don't throw their light very far (it spreads out quickly) and even if you were to put them in a torch, the majority of the light would go out of the torch and spread then, making the reflector quite useless.

Question by .Unknown.   |  last reply

Help with LEDs

Hi, I'm new to the whole electronics thing, and i decided to try and make a sign for my brother for christmas. I was planning to back light it with 4 rows of 3 leds in each row, each row being a different color. I was planning to power it with a plug in the wall power supply that outputs 9v DC 450 mA. Also i was planning to have a switch for each row, and a potentiometer to control all the leds. The leds have about a 2.8 forward voltage @ 20mA. I was wondering if it would be possible to power the leds with this power supply, and if so, what the circuit diagram would look like with all the resistors, leds, etc.. (whatever else i need). Thanks

Topic by OpenSpace   |  last reply

LED Matrix?

I tried making a LED Matrix but encountered a problem while writing the code. I thought that I would be able to light them up by applying power to rows and columns but found out that we can only light up a few LEDs at a time due to the current limit of Arduino. I now have no idea as to how I'd write the code, so I would appreciate it if someone could help me. My matrix is 5x5. I attached a picture describing how my LED's are connected. I have so far not connected the resistors and I was wondering if I could connect them on the cathodes rather than anode. So, I would like it if anyone could help me regarding the resistors and the code. Thanks.

Question by SA-DIY   |  last reply

Running LEDs?

Quick question, really. Anyone know if it's possible to run LEDs in series straight off of wall current?  For instance, lets say I have 60 2v LEDs connected in series. Could I just put 120 VAC into them (with the proper resistor of course) and they'd light up with no problem?

Question by tylervitale   |  last reply

Help with LED's

Hi everyone - this is my first post so bear with me i'm looking to create my own instructable in the form of a clock but need a little help. I want to create an LED backlit analogue clock (so just the face lights up) but i want it so that the backlight only comes on between certain times (essentially during the hours of darkness) with the ability to change the times the light comes on and goes off. I'm pretty new to electronics so don't really know where to start with this one but if anyone could give me any tips / pointers on how this could be done i'd be most grateful cheers in advance :o)

Topic by ochoellis   |  last reply

Flashing LED?

I recently took apart a flashlight, which features flashing LED's. They only have 2 leads each. One flashes on and off, and the other blue and red. I can see a small black dot inside them, is this some type of transistor? I am also wondering if there is a way to get a bi-color (3 leads) LED to flash using a transistor. What kind would i nedd, and how would i nedd to hook it up? ( diagram appreciated)

Question by XOIIO   |  last reply

LED matrix?

I'm interested in making an led matrix with random effects.  I have no programming experience, so if theres a simple way to do this with a 555 timer or something of that sort please send me a link to a site or give me details. thanks. Thanks for the help everyone. I'm looking into programming microcontrollers. I guess it would be cheaper and easier than using a bunch of 555 timers

Question by musick_08   |  last reply

led help????

Ok im a noob when it comes to leds and electricity, but i was told someone heremight could help with my delima. what im trying to do: drill holes into tail light on my ninja and put yellow leds in the hole and wire them to the existing blinker wires. the problem: messured the voltage coming off of the wire and it pulses from 0vdc to 7.22 vdc i have been looking on ebay at prewired 12v leds but dont know what im needing. any help wouldbe greatly appreciated!!!!!!!

Question by pierce-custom-bikeworks   |  last reply


Hello,  I do not know very much about electronics in general but I would like to make a circuit that allows me to run a group of " LED "  lights, maybe ( 6 to 8  ) in PARALLEL.  I would also like to do the same for hand held " Lasers "  ( 3 to 4 ) in PARALLEL. To make it more complicated, I would like to be able to use the same power source to run both groups at the same time. I would like to be able to turn either group on or off independently while using the same power source. The power source will either be --2  D cell -- or -- 4 AA -- batteries. Normally each LED uses 3 hearing aid batteries. This is the same for each LASER pointer. I think each hearing aid battery is about 1.5 volts but Im not sure what the amperage is. I would like to do it as simple as possible. I hope I can get all of the parts at Radio Shack. I have no idea where to start, any help would be appreciated !

Topic by I Need To Know   |  last reply

Led problem

Hello, I apologize for my bad English, I'm from a country where English is not the official. I have a problem, I made ​​a circuit to synchronize the lights to music with a TIP31. the problem is when I connect it to the amplifier is blown, I fixed it, but I do not understand why it burns, can you help me? Is it because TIP31 is powered by 12V? If you could help me find a solution?

Topic by mitza sb   |  last reply

Led Problem? Answered

I hooked up 12 3mm red leds in parallel and then powered them with 2x 1.5v rechargeable batteries, and it worked, until 2 blew 3 got damaged and they all started flickering. Why, and what should I do to fix it? Feel free to ask any questions. Thanks Big   

Question by alexw2150   |  last reply

LED Projects

For LED projects, click my profile name... reg ketan ----------------- "May the good belong to all the people in the world. May the rulers go by the path of justice. May the best of men and their source always prove to be a blessing. May all the world rejoice in happiness. May rain come in time and plentifulness be on Earth. May this world be free from suffering and the noble ones be free from fears" ---- Vedic blessing

Topic by pandyaketan 

LED Voltage? Answered

So recently I had an idea to make a steam gun by heating steam with a NiChrome wire driven by a 9v battery, anyway, to keep it safe and so i knew when it was on, i decided to add an LED to the circuit. I went to http://www.hebeiltd.com.cn/?p=zz.led.resistor.calculator to see which resistor i needed. From what i understand, the resistor limits the CURRENT across the circuit. So, what i want to know is whether the Led will work with the first attached circuit and not bun out from the voltage, and whether the nichrome wire and led will work in circuit 2. EDIITTT: Well, after a few answers, i'm realising i cant run this off of a 9volt, so, what small powersupply could i use?

Question by LiquidLightning   |  last reply

LED Incapacitator

The LED IncapacitatorThis story has way too much instructables-appeal to go unnoticed. I like the following line particularly: "There's one wavelength that gets everybody," says Lieberman. "Vlad calls it the evil color."It all sounds a little too much like we will soon know one of these partners as Vlad the Incapacitator.

Topic by Sullen70   |  last reply

Led lights

Hello everyone, i have a question and i think people here on instructables are best suited to help me! So i wanted to connect 21 leds together to make a bigger light. I would connect them in parallel and in series (3 in series 7 rows :P) and i thought i would use a 12v 7Ah battery to power this thing. The problem is i also wanted to use an arduino so they would turn on automatically but it can not output 12v. So is it beter to use the arduino to phisiclly controll a switch to turn the leds on or is it possible to power the arduino and then output 5v to the leds. And if it is will they be dimmer? or will the system draw more current killing my battery faster? Thats my problem and i hope someone here can help me. Thank you in advance.

Topic by thecreatorst   |  last reply

LEDs as a replacement?

I've been thinking, which, for me is strange. What's stranger, i've been thinking about saving the planet. I don't believe that global warming is solely the fault of man and his machines, nor do i believe that we're all going to fry in a ten-thousand year summer, but that's not the point of this forum, and i'd appreciate no comments labelling me as a communist, or a planet-hater. What i had in mind is a new system of lighting. Say i took some LEDs (lets say 16) and connected them in paralell, and attatched them to the appropriate power source, would they be more or less efficient than a tungsten filament lamp? As for aesthetic considerations, to simulate natural sunlight during winter months, one could add blue or yellow LEDs to tune the shade of the light. Would this idea be more efficient than the lights we have? (i avoided mentioning those energy-efficient lights because they're not really that efficient, and give crap light.)

Topic by Vendigroth   |  last reply

Standby LEDs

I got this idea from a flashlight we happened to get in at work. When the flashlight was in the off position there was a little dim red light by the power button indicating that it was off I guess but when turned on the red light turned off. I tried to find this flashlight again so I could rip it apart and figure out exactly how it does it. Anyways, my first thoughts were capacitor but as I thought about it I don't think this is true because this thing can stay lit forever. I'm guessing that it is somehow hooked up to the batteries through a resistor but I'm not understanding how it lights up when its off but turns off when its on. Maybe switch related? Anyways, I've only been messing with electronics for about a week. If someone could shed some light it would be most appreciated. 

Topic by dbyrd26   |  last reply