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SMD Led's

I have just purchased SMD LED's from China. They come on a strip. How do I remove them from the strip to use them individually?

Topic by epf321    |  last reply


Help with smd LED

Hey everyone, Recently I purchased an smd LED just for learning purposes. Personally, I have no clue how to use it and where I can put it. I have read on the internet about how you can use them for reading lights, buses, planes, etc etc. They are extremely small, and only 2 very small places where I can solder wires to. I have no clue how to use this. Do you use it on a circuit board? Not using a circuit board? I have no clue. Thanks a ton, Brennn10

Topic by Brennn10    |  last reply


Resistor for SMD LED 1306? Answered

I'm struggling to find any clues of what kind of resistor to use as I am a little new at this kind of project. I'll be using the lights in a small scale 9v project for up to 100 SMDs.  I'd appreciate any advice! Cheers :)

Question by SteveSquidFox    |  last reply


SMD LEDS safe on power supply?

Hi, I've taken two sets of 30 SMD Leds which were each powered by 3 AA batteries, and one set of 12 smd leds which was powered by usb. I have chopped the power supply cords off, and connected all 3 sets to one mains phone charger plug transformer thingy, rated at 5v 2000mA I think the current draw is around 1750mA so this should be safe. However, can someone tell me for sure? The charger gets warm, but has been runnning well for a couple of hours and the leds are nice and bright. This should save me a fortune on batteries.

Question by ferrismrk    |  last reply


4x questions about SMD LEDs.? Answered

Hi ... I would like to ask : 1. how many SMD LEDs I can power from USB (in general) 2. would and USB port handle 90 of these (uk.farnell.com/avago-technologies/hsms-c191/led-smd-he-red/dp/1058373) LEDs ??? 3. Would you rather buy 2pcs of these LED STRIPS (cgi.ebay.com/45-SMD-White-LED-Strip-Lights-Lamp-Waterproof-Flexible_W0QQitemZ370324943281QQcmdZViewItemQQptZLH_DefaultDomain_0) to get the 90 pcs ??? 4. Could I power these 90 SMD LEDs from the strip by USB (after modifying it...'cose its for 12 volts). Thank you in advance, for your answers. Zholy

Question by zholy    |  last reply


Help with an SMD circuit

Hello. I am trying to make something on my car that involves putting an array of orange SMD's in a big circle, one on each side of the car. Every circle has about 85 ish SMD's, how should i connect resistors,and which ones? Can i put them in groups of 10, and put a resistor between each? I have to conect them parallel. Thanks for the help

Question by dsirotic    |  last reply



LED Meteor Rain Light

How to make these at home as they will look awesome in my bedroom ceiling..... plzz answer Thanks in advance

Question by adarshnarsaria    |  last reply


LED Lamp Buzzing (not a bulb)

About a year ago, I came across this LED lamp that was on sale at my local Target store. It caught my eye because it had a little tray at the base of the lamp along with a USB port for charging my devices. Since the first time I plugged it in and turned it on, it makes a buzzing noise. At first it didn't bother me, but now that I am spending more time at my workbench it has become annoying. I understand it is kind of common for LED bulbs to do this because of the dimmer switch being outdated, however this lamp is not dimmable nor is it a "bulb" so to say. It's about 7-9 SMD LEDs on a circuit with a rocker switch. If it makes a difference, I do have my lamp plugged into a surge protector and don't have anything plugged into the USB port located at the base of the lamp. What can be done (other than throwing it away, of course) to stop the buzzing noise coming from the lamp? Thanks in advance!

Topic by TXVisual    |  last reply


Transformer less 6v smd led driver circuit? Answered

Hi, I have buy a 6V smd led board which have12leds. Now I what to make a cheap transformer less power supply that light it in 220v ac  mains. I try with a 474k capacitor with 100k resistor parallel and 4 dioads and  a 1k resistor connect to the positive dc output . It works but the light of led is too low. I want a circuit  like in led bulbs to drive them. Thank you.

Question by Soumojit    |  last reply


LED Car Badge/Emblem/Shield

Hi there, Firstly, I am a mechanical engineering student with a limited knowledge of circuits and electronics, so therefore I may be a little out of my depth. However I am very keen to learn about electronic circuits and have completed other simpler projects and that is why I am attempting this project. So onto my dilemma, I want to use my universities Shield of Arms to make a car badge for the single-seater racecar we are building as a project. However this badge won't just be a run-of-the-mill plastic car badge. I want it to be made from stainless steel (laser cut) and acrylic with the idea that I will solder a bunch of LEDs in series and when the ignition is turned on, the LEDs light up one at time until they are all lit, after which they all flash three times together and then remain lit up until the ignition is turned off. The LEDs I intend on using are 0603 SMD LEDs and the aim of this whole design is that it is reasonably thin (No more than 1/4 " or 6.35mm thick for the PCB however ideally I would like it to be as thin as is physically possible. The dimensions of the badge will be very similar to a Porsche badge (51mm by 69mm). I have included the Shield of Arms in question and also the Porsche emblem for comparison. Also price is an issue since as I am a student, I have limited resources, so if someone could point me to some cheap electronics parts shops etc it would be greatly appreciated. (I live in the United Kingdom so a lot of American shops will be unavailable to me) I don't really know how to read schematics but I do have friends working on this project who do,  however if anyone can guide me in the right direction with maybe a couple of how-to's (particularly the requirements for the lighting up process) and some really good pointers, it will be very much appreciated. If I have not made myself clear I do apologise and I will be happy to explain further should you need to. Thank you all in advance. I hope to hear from you soon. H

Topic by hmacdonald1    |  last reply


How to (properly) glue a SMD leds to (slightly flexible) plastic?

Hi people or robots, For a project of mine I need to glue SMD leds to a transparant piece of plastic. the LEDs need to be glued face down on the plastic so the soldering contacts are facing up. I've already tried super glue (CA glue) but this didn't hold, the LEDs would pop of when the plastic was flexed a bit. What would you (the awesome instructables community) recommend? I've ordered some two part clear epoxy to give that a try, would that work?

Question by theexternaldisk    |  last reply


What kind of power supply do I need for my 10PCS 10W 30Mil SMD Led?

Hello I just bought 10 SMD white led. This lighting project is for my aquarium. I got the LEDs but now I need some newbie friendly help to connect these light and get a proper power supply for these. I don't know how much power will I be needing for them. Here are the details of the led lights from the ebay page SPECIATIONS The details were under 10 lot of smd. Voltage: 9-12V / 900mA Chip: Genesis's LED 30Mil chip Luminous Flux:  900-1000LM Output Power: 10W Light Color:   Warm White 3000k-3200k   Cool White 6000-6500k Beam Angle: 120-140 LED Support Material:Al Working Life: 50000h Can anyone please guide me how to wire them safely and power them with a good power supply which will allow them to utilize their full brightness. Details which confuses me is how much mah and and volt I will need for all of them. It would be good if you could give me a ebay link so that I can order it online. :)

Question by TaNviR77    |  last reply


how can i remove these smd leds without melting them? Answered

I want to know so i can mod my ds with them. this is half of a cell phone with 19 blue leds.

Question by zack247    |  last reply


SMD bulb rework from 5 to 4 Led´s?

Hi, im trying to get some Led bulbs to fit in my dashbord on my car, the standard B9s fitting is ok, but the 5 SMDs get to high...is it possible to remove the top SMD, so it gets only 4 on the sides?And still get it working? http://www.e92-lighting.com/images/products/gp-ba9s-smd-5w.jpg Regards

Question by Leaded  


phenoptix - LEDs, 3mm, 5mm, 10mm, SMD and Superflux

Www.phenoptix.comLEDs, resistors, Kynar wire and many new products coming soon.UK based with fast and low priced shipping worldwide.

Topic by phenoptix    |  last reply


i Need help with leds? Answered

The question is in the picture

Question by diabloboy    |  last reply


How can I sync SMD LED Strips to music?

Plz give me schematic how can i sync 12v SMD LED Strips to music using TIP 31 and PSU as a 12v DC Output. I get the idea from here If there is a possible substitute of TIP 31 plz suggest 

Question by adarshnarsaria    |  last reply




SMD IC Star LED Flasher Kit

Here's a kit that pays homage to someone we all know and love...http://www.goldmine-elec-products.com/prodinfo.asp?number=C6708

Topic by ewilhelm    |  last reply


[PCB Modification] How to change smd LED to 3mm LED? Answered

Hi guys ! I'm currently working on a portable bluetooth speaker project. I want to modify an existing bluetooth speaker to have a bigger battery life (thanks to 4x 18650 batteries) and to be able to charge a smartphone thanks to a usb port. So I want to modify the speaker PCB to add the batteries, the phone charging circuit (the powerboost 1000 from adafruit) and integrate it in a custom made cabinet. I don't have the speaker yet, but I've joined a picture of the 5-button array on top of the speaker and a 3d sketchup design of what the speaker will look like next to 4x18650 batteries when finished (in red the area with the buttons (shown) and the leds (not shown)). The power and bluetooth buttons both seem to have leds. The speaker is powered by a 3,7v Li-ion battery. I need to change the original buttons and leds to use panel-mounted ones and I'm wondering how I can achieve that and select the right Leds in order to not damage the speaker's PCB !  Thanks in advance, Mahot

Question by boulou    |  last reply


Music LED Sync?

For the circuit in the pic can I use the transitor listed here  instead of TIP31, SMD LED Strip instead of the 4 LEDs, and can I power it with an ATX Power Supply as it also has 12v DC output???? Thanks in Advance.....

Question by adarshnarsaria    |  last reply


LED Matrix & POV PCBs up for grabs!

Boy do I have a deal for you! I've been working on an uber-clock project recently (it's going to be really really awesome!), and it entails a very interesting display -- a 5x16 array of SMD LEDs.I tried making a homemade PCB, but it was impossible to use, so I'm sending my order out to a fabhouse for some real ones. While I'm at it, I'm offering you, instructablonians, the chance of a lifetime: Owning one of these awesome* boards!For $18, you get the PCB and 100 red SMD LED's! (LEDs courtesy of T3hMuffinator) -- this price pretty much covers the cost of the board & shipping.For an extra 5 bucks, I'll stuff the board with the LEDs for you.(The 5 bucks is to cover the solder paste, and the labor involved :P)It definantly needsto be stuffed with solder paste, the parts are very close together. It is litterally just the LED matrix, there are spots for it to be connected to a controller board, where the resistors would lay.EDIT: Heres the schematic, sch file, and the board.EDIT2: New board design, much much more compact! 3.15" x 1.20"! EDIT3: Just in case we get a flood of replies, I'll repeat 'Muff.He's supplying the LEDs. They're avaliable in red, white, yellow, and 1 other color. They're from [www.select-technology Select Technology] (eBay UMO88)EDIT4: I also have controller boards availible. They're basically an AtMega8, resistors, header pins, power, etc all on a board the same size as the array. (not an easy task!) They're $18, PM me fore more detailsI also have some POV boards availible. They are uber-compact, at only 0.8"x0.6"! They come with 10 SMD LEDs. They cost $5 a piece. Just add the Attiny13 & power!For $15, you get the POV PCB, the LEDs, 11 Male & 5 Female header pins, a DB-25 connector, an Attiny13, and its socket. Its everything you need to use this PCB. (Note: you need a parallel port on the back of your computer in order to use this board to program the uC)Its a very self-explaintory PCB, which makes it great. Its compact size is great for a few different thingsAn instructable is coming really soon on making/stuffing/using it, so don't dispair!---All three boards distributed by Rethinker Industries and liscenced under by-nc-sa.

Topic by zachninme    |  last reply


LED Help Needed

OK, here's what I'm thinking. I wanna lite the bottom edge of a piece of plexiglass so it will lite the edge all the way around bright green. I have enough of the super small SMD LEDs. I wanna be able to do them a in single row using 30 or so of them end to end. Is this possible, if so how would I get the right voltage for this? And would I need to use resistors?

Topic by Ghost915    |  last reply


How to make a constant 5v power supply from 12v battery for 3 no. of 1watt smd led lights?

I have lm7805 voltage regulator, 3 nos. of 1 watt smd led 3 to 3.7v 320ma power of each led. I want to use these 3 led in a parallel circuit. so please tell me the resistor value and capacitor value for making this circuit.

Question by grs_14    |  last reply


Basic LED project

Hi there I have an idea in mind and would like to know if you guys think it would be possible to make. The object is for the battery to last a minimum of 150 hours of constant use. I want to use the smallest possible LED say 2mm or even a SMD will be sufficient, the led must run off a very small battery either a LR44 / CR1225 or something similar in size and the design must have an on off switch.   Do you have any suggestions? Is this even possible? Any ides? Thanks Matt

Topic by b1g5l1ck    |  last reply


LED bracelet inlay

This is my first post so please excuse if I am in the wrong place :( I have a boot bracelet with a leather back and ornate bling glued to the leather and sewn at the edges. I want to add small LED strip lights, weather proof, cutable every 3 lights, double-sided adhesive to the center (between leather and ornate mesh side. I want to be able to turn it  on and off.  I figure 6 mini strip lights should be more than enough.  Here are the lights I have: Features: Superbright 3528 SMD LEDs with high intensity and reliability. 5 Metre strip with 600 LEDs Self-adhesive back with double side adhesive tape. Maintenance free, easy installation Long life of 50,000 hours Flexible strip which can easily be curved around bends. UUltra-bright but running at low temperature Viewing Angle : 120° Input volts: DC 12V This Cool White strip light has 600pcs Double Density,SMD 3528 LEDs The Strip is Customizable for any length you want, Cuttable every 3 LED's without damaging the rest strips, flexible and can be bent at any angle, Works with a 12 Volt Power supply Low power consumption, Eco Friendly, High Quality, high intensity and reliability, High Quality Cool White, Double Density 600 LED's, 3528 SMD 5M/16.4 ft, high intensity and reliability, Long lifespan,   Hopefully that helps.  What I need is a battery source that can be added to the inside of the bracelet that will light it up and allow me to turn off and on (push on/off is better than switch). The source would have to be in something waterproof like a latex substance and can only take up a minimal amount of space 1.5 - 2".  Obviously the batteries would have to lay flat (flat coin-like batteries?) Is there ANYONE out there who can give me ideas?   Thank you!!!  

Topic by harley0805    |  last reply


I have a LED i cant light, no matter what. It has a little black dot in it. What kind of LED is that? Answered

Appearance: It is a common 5mm, transparent case, LED, being different from all others only by having this very tiny square dot over its anvil, kind of covering the reflexive cavity where the semiconductor (i don't know which) gets lit up. Other: I could not light this LED whit voltages from 1.5V to 3.5V. =O It came out of a photocopying machine, and was paired with an IR LED in some kind of emitter-receiver set. Other components of this set were a pair of smd resistors and a smd trim pot. Would it be and IR receiver or photodiode? UPDATE: I've took some photos of the mysterious LED. BUT, as no macro-enabled camera was available, i had to do the ghetto-way of photography. Soo: i have photos of it compared to the IR LED, and some photos of both anvils (IR, unknown), at 200x magnifying. Here they are. BTW, i hadn't tested the suggested circuits yet. =(

Question by vinacarv    |  last reply


What kind of led to use in cloth?

Would like to know what would be a good size/ type led to use to have all over a garment such as a shirt, or pants, or hat etc., and would like to make them flash randomly (possible halloween/ new years/ party outfits, etc.). I like the look and brightness I've seen in the ones that are in the led strips, but don't know if or how those surface mount led's, such as 3528's, 5050's, etc., can be bought individually (and operated without chips), and if so, how I might go about attaching/ sewing them into, or onto the cloth. I need small but as bright as possible. They would probably need to be able to operate on anywhere from 3 to 12 volts (maybe carry battery/ power pack in pocket?). Do they make some kind of led I just don't know about for this kind of thing? I'm not looking for prefab units that attach to your clothes by just clipping or sticking or pinning. Could also use any ideas on wiring (to include flashing means-maybe 555, or other method?) Thanks for ideas.

Question by stevecinstrfme    |  last reply


xbox 360 error lights after ring of life mod

Hi ive seen after mod error lights but every time i never get to see the rf board to see how they do it or what smd/leds they use to do so any help will be meet with the upmost appreciation thank you

Question by joesome  


LED Lightbar DIY

Hi folks, I hope this topic is in the right place. I was going to try my hand at building my own LED light bar like the one in the picture below. It will be around 40" long with 2 rows LEDs and running off a 12v car battery. What W LEDs would you recommend? Also materials, what would you use for the housing, clear front etc? I was looking at 10w SMD Chips but I'm not sure if they are super bright but then again there are going to be a lot of them in the bar. They have a operating Voltage of 9-12v, if I have so many of them will i need some sort of amplifier half way down the rows? Any help with this project would be greatly appreciated, Thanks in advance. Chris.

Topic by CDolan1989    |  last reply


what size of battery pack for led strips?

Im trying to figure out how big of a battery back ill need for led 5050 smd strips.  ill have probably no more than 20 feet of leds.  im using them on cornhole boards if that helps. thanks

Question by garrgamill    |  last reply


How to make it work? USB + 5V rechargeable battery + 12V LED strip!

I want to an LED Strip that works my USB or Battery, I got the battery and the USB working fine, the battery charges up without problems, but I need to light the LED Strip (12V) with a 5V battery. Is there a DIY way to: -Step up the voltage, or -Step down the LED Strip Voltage. I know each SMD LED works around 3V, but I can't make sense of the wiring and resistors on the Strip, to wire the SMDs in parallel.

Topic by RaptorHunter    |  last reply


i need help finding heatsink for led?

I have these LEDS (http://www.cree.com/products/pdf/LEDlamps/CLN6A%28979%29.pdf) and dont know what type of heatsink to put them on can anybody suggest me to any in particular.

Question by diabloboy    |  last reply


LEDs Driveway Solar Setup

Help with LEDs (2 Part Question- Answer what you can) I got a reel of 5 Meters SMD 3528 Epistar LEDs Power Source: 12 Volts DC Wattage: 60 Watts Power Consumption (W/m):18 Watts / Meter LED Chip Model: SMD 5630 LEDs Number/M: 60 pcs / Meter How many Amps needed in a charge controller? Solar Cells Average Power (Watts): 2.6 Wp Average Current (Amps): 5.2 Imax Average Voltage (Volts): 0.5 Vmax Do I need to wire the solar cells 3 in series to reach 15.6 volts (Calculated loss so not 12v) and then parallel to reach 60 watts for the LEDs? (I plan to have around 70 watts just for incase and rely on the charge controller to lower voltage to 12V.) ------------------------------------------------------------------------------------------------------------------------ (I am using a standard car battery. An old one that has lost a lot of juice, but I tested the LEDs on it and it still works.) Is this okay? Am I doing things right? Thank you all for your help!!! :o)

Topic by Learning Exp  


can someone draw a thru hole board for RGB 10w LED with 12v input? Answered

12v input from car battery to power this LED   something swimilar to these 1 2 3 but cheap and simple cos i dont wanna use SMD some info   on LED and board

Question by turbiny    |  last reply


LED Suit of light

Hi, I am looking to build a fancy dress costume, and have approximately 12 months to make my costume :) What I would like to build is a replica of the following (or something similar): http://www.gizmodo.com.au/2012/02/night-snowboarding-in-an-led-suit-is-mesmerising-to-watch/ I have searched for flexible fabric with woven LEDs, i have also searched several suppliers on Alibaba for flexible led mesh screens but nothing seems to be quite suitable. I think, for this, i would maybe be best off building the suit from strips of waterproof 5050 SMDs like this: http://www.alibaba.com/product-gs/615439688/business_agent_smd_505_led_strip.html Power would be in the form of the biggest 12V power supply I can find. The only problem here is that at full brightness, the suit is going to consume A LOT of juice... I have seen this costume which is similar in construction, except all the LEDs twinkle (like TV static): www.youtube.com%2Fwatch%3Fv%3DLal9uma1iVc&ei;=nwgtUNT7B6_Z0QXekYGwDA&usg;=AFQjCNENmYUCu_AwYaEAwqAiWSDFRFnUeg&sig2;=FXRYO81ccZavpYyeBsZMyQ This has the added advantage of lower power draw as not all of the LEDs will be on at the same time. I actually much prefer this concept, however I have absolutely no idea where to begin on schematics... Any insights or friendly advice from the experts would be handy, I have a rudimentary knowledge of electronics, and am very handy with soldering. Thanks!

Topic by Zander83    |  last reply


Help me to make a led panel

Hello guys.. I want to build a led board for my planted aquarium... the total watt requirement is 84 watt.. so I decided to add 16 5watt 12 volt smd led chip... but I hv some confusion about the circuit.. plss help me to build the board.. its urgent...

Topic by আহারেব    |  last reply


Kickstarter - Fos - A hackable, fabric-based Bluetooth LED display

Hey guys, There's a new wearable device on Kickstarter called Fos: http://www.kickstarter.com/projects/erogear/fos-a-truly-wearable-bluetooth-led-display-system It's indistinguishable from fabric yet receives real-time video streams so you can draw text, graphics, 3D objects or whatever on your body or wearable gear via your smartphone. This means you can do GPS-guided turn signalling for cycling, display current real-time athletic stats, wear dynamic fashion designs and more. It's affordable and comes with a free SDK to give you 100% control over every pixel, all the time. I promise to only spam you once, I've got one shot at this. =] -Anders

Topic by ufanders  


Where can I buy 0402 LEDs? prewired would be nice

I want to buy some ultra small smd LEDs, I'm thinking 0402 size. I'd like them already wired, or if somebody could point me to soldering instructions for these, that would be good. Thanks.

Topic by aliasjanedoe    |  last reply


How do I power an LED light strip? Answered

Hello, I just purchased an LED light strip from Amazon: Triangle Bulbs 3528-IP65-White-60L Pure White LED Strip Light, Waterproof LED Flexible Light Strip 12V with 300 SMD LED 12 VDC Super bright Waterproof Cool White 3528 SMD LED strip     Length:16.4 ft./5 Meter 300 LED lights per reel. Allowable cut every 3 LED lights     Easy and flexible installation. Ideal for home and business lighting decoration.     Comes with 3M adhesive sticky backing     High brightness, wide angle LED chip. Low power consumption - Only 4.8W/m LIfe: 50,000 hours I already have a 12V DC 2A battery pack. (it holds 8 AA Batteries). What else do I need to complete the circuit?  I am thinking I need some sort of on/off switch, but have no idea what I need to buy.  Thanks!!!!

Question by KaleiS    |  last reply


which power supply rating do I use for my diy led light panel?

I'm building a led light panel using 24 x 18W SMD 5630 72LED Rigid Light Strip Tube Bar Lamp Bright White 12V 1800LM connected in parallel so whats the power supply rating  Specifications for each lights strip: 1. Key Features: LED Light 2. Light Source: 72 LED 3.LED Size: SMD 5630 4. Luminous Flux: 1800LM 5. Output Power: 18W 6. Voltage: 12V 7. Light Color: White 8. Color Temperature: 6000K 9. Lifespan: 30000-50000 Hours 10. Material: PC & Aluminum 11. Dimensions: (100 x 1.8 x 1.5)cm / (39.37 x 0.71 x 0.59)" (L x W x H) 12. Weight: 6.7oz / 190g

Question by tinat36    |  last reply


Rgb matrix, looking for some advice/guidance.?

Hi, its been quite some time since Ive been here. And I still have the same two projects in mind. However, the project im more focused on, is a 32x16 RGB led matrix. Made up of four sections. Im following the project by the two guys over at solderlab.se. They arent very active and speak a different language so their english explanations arent as thorough as Im looking for so I figure id ask the people here :) So, the main questions I have: 1. What kind of material can I use to put the leds on? its like they use thick cardboard or wood. they drill all four holes per led so the legs go through. I want one big board instead of two.  2. What spacing would be good to make it look uniform, yet give enough space to solder?  3. How can I make the 4 controller boards to run it? - They sell them, but they arent cheap. And they dont deliver or sell to the US. So Ill have to make them somehow. I can provide images/part list of what they used.  4. What type of solder/soldering iron would I need? Obviously various temp. But what temps would be safe?  5. What power supply can I use? Ok so, any other info: -They used common anode LED's  -They connect the boards together via ethernet cable.  -They connect the led's together in four sections of 8x16, The anode is connected on each of the 8 rows. And the anodes on all the led's are connected on the 16 rows. If that doesnt make sense, the anodes are connected vertically, and all the cathodes are connected horizontally. -They connect the 48 cathode wires to ribbon cable, that goes to the controller board, same with the anode wires.   -They connect the boards to a Usb to UART connector -Lastly, Part list of one controller board:  HEXFET IRF7314 x4 TLC5940NT x 3 28 Pin IC-Socket 300mil x 4 Resistor SMD 0,25W 1% 10K x 10 Resistor SMD 0,25W 1% 2K2 x 8 Resistor SMD 0,25W 1% 2K x 3 Resistor SMD 0,25W 1% 220R x 2 Resisitor SMD 0,25W 1% 1K x 3 AtMega 328P x 1 74HC138 SMD x 1 Ceramic Capacitor 22pF, 20% x 2 Oscillator 16,0 MHz x 1 Pinheader 2x8 Pitch 2.54mm x 4 Jumper x 3 Pinheader 1x2 Pitch 2,54mm x 7 Modular Jack x 2 Ceramic Capacitor 100N, 20% x 5 Electrolytic Capacitor 680uF x 1 LED 5mm blue x 1 LED 5mm green x 1 Screw terminal 5.08mm x 1 If theres ANY more info required please ask. It said to be as detailed as possible.

Question by 'earl    |  last reply


I want to make a joule thief to power a 10W LED (833ma @ 12v) from ~2 AA batteries, suggestions on toroid ? # of turns ?

My transistor inventory: Part #          Package TIP122       TO-220 TIP32          TO-220 2N2222      SMD 2N3904      TO-92 2N3906      TO-92 C1815        TO-92 BC546        TO-92

Question by yaly    |  last reply


If i cut an LED strip that requires 12v, will the strips still requre 12v or a lesser voltage because theyre smaller?

I have a 5m smd led strip. Well of course, 5m is too big, so I want to cut it. The strip requires 12v of power, so I was wondering if I cut the LED strip if a strip would need less voltage. Thanks to anyone who can help

Question by Prestond    |  last reply


Is the reverse voltage on all LEDs always 5v or more?

I have a bunch of LEDs (mainly 0603 and 5050 smd, 3mm, and 5mm - all colors).  Most of them don't list a reverse voltage.  Those that do say 5volts.  My question is, do any LEDs have less than 5v reverse voltage?  Is it possible to accidentally kill them by connecting backwards to a 5v power supply?  Should I put resistors on both the positive and negative to protect them (would that even work)?  Thanks.

Topic by aliasjanedoe    |  last reply


Nasa work standards

I saw this on engadget and thought you might be interestedThese are the standards for how nasa employees have to do stuff (soldering, welding, smd, painting, etc)http://workmanship.nasa.gov/wkstds_nasa.jspAnd you might like this toohttps://www.instructables.com/id/Get-the-LED-out-Glass-Filled-LED-Lightbulb/

Topic by LinuxH4x0r    |  last reply


what battery pack would be needed to run these LED light strip for 6 hours?

Hi all, I am looking at building a wearable battery pack to power these light strips, As I am looking at this the wattage seems high 12 watts, I figure 8 AA 1.5 VDC batteries run in seriers would do the trick but any idea on run time?   http://www.dealextreme.com/p/12w-470nm-150x3528-smd-led-waterproof-flexible-blue-light-strip-5m-length-dc-12v-96072 Thanks!

Question by skobo    |  last reply


LED/PCB mods. I adapt cheap led lights. Will gooping the pcb to weatherproof it shorten life? Answered

I'm an old electrician obsessed with LEDs and selling them to my old customers. I build custom landscape fixtures and have been purchasing cheap led lights and bastardizing them for parts. I've had several that moisture got to the pcb and it died of various causes. I've been gooping the supply wire solder points among other things to increase durability. If I goop the entire back of the board the smd is on, will it cook itself?  Any other ideas to increase durability without shortening life expectancy drastically will be greatly appreciated. Zappenfusen 

Question by zappenfusen    |  last reply