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 marking!

Hello, I recently had a tablet to repair and this SMD IC was damaged: "C03AE". I can't figure out exactly what it is. Results I got range from LDO to Power switch to overcurrent protection. Does anyone know or have the datasheet for the latter? Its SOT-25 package. The tablet works fine without the IC (can charge, work on wall adapter only, etc). Here are some voltage readings WRT to ground (pin 2) and battery at 36% charge (pin numbering as per picture) Case 1: display ON, charger not connected: Pin 1, 3 and 4: 0.00V Pin 5: 3.64V Case 2: display OFF, charger not connected Same as case 1 Case 3: display ON, charger connected Pin 1: 4.74V Pin 3 and 4: 0.00V Pin 5: 4.64V Case 4: display OFF, charger connected Pin 1: 5.11V Pin 3 and 4: 0.00V Pin 5: 4.74V Any help is greatly appreciated. Best Regards, Nawaz

Topic by Nawaz   |  last reply

Quick SMD question

I am just getting into SMD work for PCB's & I was curious when I am using the electric skillet method for solder reflow does the PCB have to sit on the skillet itself or can it slowly pass over & the heat that is coming up from the skillet still cause the solder to flow like it would sitting on top.

Topic by sofiadragon1979   |  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

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 Soldering without Soldermask?

I'm working on a project and I needed to get a PCB made. I was planning on getting it from BatchPCB, but I ran into a little problem... I'm using a NAND Flash chip, which is TSSOP48; the footprint has 6mil spacing! (BatchPCB has a 8mil minimum) The next cheapest solution would be Barebones PCB, which makes prototype PCBs without soldermask & silkscreen. I'm worried about soldering on the Flash chip, and another LQFP48. Will the lack of a soldermask make it impossible to do?

Topic by zachninme   |  last reply

How to replace an SMD inductor? Answered

I have an 2gen Ipod shuffle which I burnt. Now after a long while I found that an inductor cas destroyed. How can I find it's value?or Can I put a jumper instead?

Question by theVader75   |  last reply

Pick and Place Machine for SMD

Can someone please direct me to an instructable for building a pick & place machine for SMD chips, please & thank you.

Question by sofiadragon1979   |  last reply

smd lm386 vs lm386?

I want to build simple amp but i have a problem, in eletronic store where i buy they dont have standard lm386 but they have SMD LM386. maybe they will get standard lm386 but its 2x more expensive then smd. So can i make amp using smd lm 386? and if i can does i need some other parts ( for standard i need 2 resistors, 1x 1k potentiometer, and 1-2 x capacitor)

Question by tealk   |  last reply

Salvaged smd micro controlers.

Hello everyone, i just salvaged some great finds i think i have a surface mount PIC16F72-1/SO and a PIC16F877A, plus a few other componets. i am wondering what do i need to be able to program and use these PIC's i have very limited knowledge on micro controlers, i am currently learning with the Arduino UNO. and help would be appreciated. and also i have salvaged some other parts kia324f "quad amp" will this work like the more commonly used op amp's i see in other instructables, ATMEL346 not sure what i can use this for. i have more parts that i am unsure of what if anything i can use them for but i dont want to bother everyone with my list =) ill try and post them a little at a time. and agian thank you in advance for your information.

Topic by omnacron   |  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 ( LEDs ??? 3. Would you rather buy 2pcs of these LED STRIPS ( 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

Woot! My first True SMD soldering job!

Yay! I finally soldered my first SMD chip package! (And it didn't explode!)

Topic by T3h_Muffinator   |  last reply

anyone involve in fixing motherboard computer, espcially invoving soldering smd chip, smaller chip, ic, qfp n other. Answered

What i means does solder smd part such as ic can be done , for computer motherboard,  can you show me some guidlines about this. plesea. 

Question by hore   |  last reply

what does this chip do? Answered

I have a atmlh812 smd chip here, but i cant find any datasheets on it. it also says 02B(or 8) 1 (.)Z8F1056C is it made by atmel? can someone help me find a datasheet for it?

Question by zack247   |  last reply

How can I safely interface an in-circuit chip? Answered

I have a circuit with a tsop packaged flash memory chip. Is it possible to interface with the chip without removing it from the board and without damaging the rest of the circuit?  If so, how (preferably without soldering on the board)? I am mostly concerned with how to physically connect to it.  I have the datasheet to help me figure out the software portion.

Question by kidmosey   |  last reply

Type of diode

Hey everyone, I recently had an ASUS laptop to repair and after troubleshooting, found some damaged components among which is this surface mount diode (kindly see picture). I looked around for a datasheet but cannot find anything. Am also unable to find out exactly what type of diode it is from its code marking. I've had results varying from a 'leakage diode' to '3.3V zener diode'. However, I am suspecting it might be a schottky diode since it was in what looks like a boost circuit. Any help would be greatly appreciated. Code marking: 100 98FP1  j Thanking everyone in anticipation. Kind Regards, Nawaz

Topic by Nawaz   |  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

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 it possible to remove the top SMD, so it gets only 4 on the sides?And still get it working? Regards

Question by Leaded 

SMT variant of 2N3904 NPN transistor? Answered

Im looking for a SMT equivalent of a 2n3904 transistor. I found one on digikey that might be similar, the MMBT3904. Is this correct? Many thanks- Astroboy907

Question by astroboy907   |  last reply

can DIY hot air soldering iron solder other smd component such ic, transistor,and other smd component.?

Without destroying anything,especially the board,

Question by hore   |  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

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 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

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 [ 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

SMD IC Star LED Flasher Kit

Here's a kit that pays homage to someone we all know and love...

Topic by ewilhelm   |  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

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 

Water-damaged PCB repair

So water leaked in to the General Electronic Module (GEM) on my pickup and now it's acting all funny. A/C runs when the ignition is off, randomly switching to 4L, airbag light chattering on and off, etc. I want to try and repair it. My intuition is that it just acts up when there's stray conductivity between traces/elements, so if I give it a good clean and keep it dry it should work like new.However, I noticed upon pulling it apart that there's some corrosion taking place. Can anyone suggest a good way to repair these traces/SMD resistors? I have a soldering iron but heavily oxidized things don't take solder well in my experience. Or should I just put some lacquer on it and not worry about it?Thanks!

Topic by RelaxedSoup   |  last reply

How to upload to another arduino without removing the atmel chip? Answered

I bought a arduino uno  and i got the smd edition i want to upload sketches to my arduino pro mini with the smd version any luck??

Question by TheGreatResistor   |  last reply

Arduino UNO R3 SMD Uploading Error on Widnows 7 64bit

Hi, I just Installed Arduino UNO R3 SMD to my Windows 7 64bit. and getting     avrdude: stk500_getsync(): not in sync: resp=0x00 error when uploading I'm sorry if it is a old problem solved somewhere in this forum. But last couple of hour i couldn't find it. Please see attached image for better understanding. Thanks Farness

Topic by farness   |  last reply

i Need help with leds? Answered

The question is in the picture

Question by diabloboy   |  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

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

[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

microcontroller on arduino board?

I am a newbie to arduino.I 've learnt atmega328 controllers are used on arduino.I am using arduino smd rev3 can someone please label it for me?  

Question by manaswini1317   |  last reply

Print Circuit Boards with Squink

From kick starter page: Create circuit boards in minutes, from home, at the cost of a cup of coffee - Squink prints conductive ink and assembles your circuit. Atmel had posted about a new device called "Squink". What it does is print a circuit board on paper (or anything flat like glass), applies conductive glue to the contacts, and automatically places your components on the board for you! They have a kick starter here: but I am 13 and cannot fund it. I believe this device will be found in the home of makers all over, and I think spreading the word will help these people. So please head to the page and fund/share the word!

Topic by DELETED_JesusGeek   |  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


Hello i have a small problem/question, i have a bunch of smd micro ships, and i wanted to know if it is possible to make an eagle schematic. If not, can you tell me what program i can use? thanks!

Topic by Sandisk1duo   |  last reply

i need help finding heatsink for led?

I have these LEDS ( and dont know what type of heatsink to put them on can anybody suggest me to any in particular.

Question by diabloboy   |  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

has anybody made a hot-air gun out of a soldering iron and a hair-dryer??

I searched around and but there are 'ibles using desoldering irons and vacuum pumps; not actual soldering irons. I wanted a hot-air gun for desoldering an SMD chip.

Question by rammstein2   |  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

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) you might like this too

Topic by LinuxH4x0r   |  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 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

mini laser driver for 1 w blue laser pointer?

Hi anyone here?  I need help with the construction of mini (using smd)  for 1 watt blue laser driver. I find it difficult to obtain the circuit for the driver. I would be grateful if anyone can help me. Thanks in advance. Tony1gunalan

Question by Tony1gunalan   |  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