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Simple Dimmable LED setup?

Hi everyone, A friend of mine has a project which involves using a large amount (40+) standard 5mm LEDs to light a frame to a uniform brightness with the ability to dim the entire setup uniformly. Due to the shape of this frame its not economical or practical enough to use strip lighting. Rather than try to explain the circuit design I came up with I have included it as an image. Essentially I'm worried that I've overlooked something in this design and was wondering whether anyone with more experience would be able to take a look and point out any problems I've missed. If anyone has the time I would be incredibly grateful.

Question by Zaryck    |  last reply


Dimmable Mains LED lamps? Answered

I have changed all my internal lamps to 240 volt LEDs - I notice some LEDs are dimmable and some are not any one know why? As a supplemental  question anyone know how they step down the 240 volts for the LEDs? I have yet to take one apart to see.

Question by rickharris    |  last reply


Choosing the right LED Dimmable Driver...

Hi all, I am hoping someone can clear this up for me. I am building a DIY LED aquarium light and have chosen the following components: - 16 x 3W LED, Cool White - 4 x 3W LED, Royal Blue - 2 x 3W LED, Red I want to run all the LEDs off one dimmable LED driver and I have found this one which I think will work: http://www.aliexpress.com/item/Free-Shipping-Top-selling-12V-0-10V-dimming-LED-driver-PWM-led-dimmer-constant-voltage-3/1410890719.html I also wish to make each colour dimmable by using a potentiometer for each of the 1-10V lines. Therefore, 16 white LEDs will be in series on one channel, 4 blue on the second channel and 2 red on the third channel. What I would like to know is the following: 1) Will I be able to safely run all the LEDs on each channel as described above? 2) What value potentiometer should I use for each of the 1-10V control lines? 3) Do the 1-10v control lines require a seperate power supply or are they regulated internally from the 12-24V DC IN? Any help/advice is greatly appreciated!

Question by DonSpud    |  last reply


DIY dimmable multichannel LED powersupply/driver help

OK I was looking in to replacing my T5 lighting over my reef tank to LED.  LED's are apparently more efficient, blah blah blah.  They appeal to me because of the DIY element, I can customize my color scheme pretty much however I want it.  I did some sciencing and some mathing and I figured out how many LED's I would need for my tank.  I knew that I would need some sort of power supply to hook these up to to power them.  That's when I discovered all the little things I had to buy to power my LED's.  The different colors require different voltages, and have different mA's so they have to be seperated to similar channels, or have multiple drivers operating at different voltages.  The dimmable counterparts of these devices cost more money,  and then I have to decide between analog or PWM, and then actually buy potentiometers(more money).  Which just leaves me to want to just make one on my own.  But I'm going to need some help.  I know the volts and currents required of my LED's, but I don't know what parts(resistors and things) I will need to get from the wall to my lit up LEDs. I imagine I'll need to get some sort of a power supply or adapter that plugs into the wall.  From there I'll need to convert the voltage from AC to DC. Then a controller for each channel.  Each channel contains an inline dimmer and LED's.(6 channels) with a max of 50v. I'll need to print at the very least two circuit boards and make a housing for each. I've attached a diagram.  It includes the electric potential and electric current requirements for each channel and gives image to my post.      This is all I can do.  I don't know what I need to make this, and I need help.  Please reply. Edit 1.: OK so I guess I need a rectifier to convert to direct current then I need capacitor(s) (don't know how many or of what value? I don't even know what value capacitors come in) to smooth out the current, and then I need voltage regulators on each channel.  however, I do think that since I want my channels dimmable that having potentiometers might do the same thing. With the different channels coming from one power source, I'm not sure how to make them independently dimmable(and varying in mA and v) without affecting each other.

Topic by stryke297    |  last reply


LED Driver for LED fairy light strands

I bought several of these strands of leds  http://www.banggood.com/Warm-White-Or-White-10M-100LED-Copper-Wire-LED-String-Lights-Lamp-12V-p-927282.html I want to wire two of them together to make a chandelier with one dimmable power supply.  Each set comes with a 12 volt dc 1 amp power adapter. So, do I need a 12 volt dc 2 AMP 24 watt power supply that is dimmable.  I will be going from standard US electric 120 vac. I will be wiring then in parallel so that I don't have to mess with making the strand twice as long and worrying about more resistance. Mainly all the power supplies I can find are a little higher amps and more wattage. Could that blow them all? http://www.peaktopeakpower.com/apv-25-12 Any help would be awesome

Topic by Creativeguy  


led bulb dimmer

How to make a dimmer for led bulbs which are non-dimmable type?

Topic by allwynkumar    |  last reply


Way to control two fluorescent bulbs in the same fixture individually?

I would like to set up a few fluorescent light fixtures that each have one blacklight bulb and one white bulb. I would like to be able to control them individually so that I can have either the blacklight bulb or the white bulb on at any given time. It would be preferable to be able to dim the white bulbs, but this isn't necessary. I am okay with running a 14/3 power cable assuming two ballasts would fit in one fixture. I would also like to accomplish this as cheaply as possible.  Thank you.

Question by natedawg1013    |  last reply


Wireless controlled (bluetooth/wifi) dimming light bulb

Hello guys! I was wondering if there are dimmable light bulbs in the market that can be controlled over wifi or bluetoooth. I have an idea for a product and an app to control it. Can anyone help? Thanks a lot! Sam

Topic by samumar    |  last reply


LED Dimmer help

Hello,     I have a project that uses a 24" LED strip, powered by an A23 12v battery.  I need to make the LED manualy dimmable .  Is there an inexpensive assembly that would work for this? Or  If i need to make my own, could you give some direction to someone new to electronics?  Thanks,

Topic by surgeslayer  


Is it possible to have a Korg Nanokontrol modded to be used as a lightboard? Answered

I am getting into light effects and I usually deal with music effects, but is it possible to use a piece of musical equipment for lighting? I think that it would be cool to use USB lights that are dimmable by using a Nanokontrol. Has anyone tried this? Can it even be done? Pic related, it's a Nanokontrol.

Question by Izokay    |  last reply


Can't find an Instructable that used to be here but not anymore, is it possible to get it again.

Hi there, I was following an Instructable I Think it was called {Convert and old laptop monitor into a Light Box} it was something like that, But it is no longer online, I am not sure who the Author was and I didn't download it. I ordered the parts needed for the power supply and now they are in it isn't here anymore Is there anyway to find out what happened to it or better still get a copy of it, as I am nearly all done and I just have to make this power supply and I am finished as it is all pulled apart. I have an Acer Laptop and I have stripped the monitor down to the backlight, I have the Inverter needed, i even have the Potentiometer so the box is dimmable. Any help would be appreciated. Thanks Gordon

Topic by Ismegordo    |  last reply


Led buck converter schematic Answered

I have been looking for a led buck converter schematic for quite some time now and i haven't been able to find one that suits my needs. i have a single 3 watt led that i believe needs 700ma to run. My whole purpose for the converter is to dim the led so it will have a longer battery life. i'll run it off of some rechargeable batteries that i can remove. Also i would like to be able to purchase most of the parts fairly easily. The requirements of the buck converter. -Compact -Battery powered -Dimmable -Capable of powering a 3w 700ma led This is a link to the data sheet of the led: http://futurlec.com/LED/LUXEON_3W_WHITE.shtml Thanks in advance

Question by Logan Hanssen    |  last reply


Will a battery power a short LED light strip drawing 3 amps?

I am building a lighted mirror attached to a pole for conducting searches in tight places.  I have an 8.5" convex mirror which results in just over 25" of circumfrence.  I would like to use the LED light strip linked below to provide light to the area being searched and would like for it to be run off a battery source to make it easily manueverable.  I plan on using 2 ft of the LED rope.  The product specs indicate it should draw 3.0 amps.  Would a AA/series of AA batteries (or another small battery) power this light strip if wired into a switch and a battery pack? http://www.environmentallights.com/Waterproof-Dimmable-Super-Flat-LED-Rope-Light-with-5050-LEDs-60-m-by-the-metric-foot-11-8-inches-300-mm-24-VDC-Daylight-White_P3821.aspx Thanks.

Question by flohrstw    |  last reply


Help! Please Donate More Common Sense!

It's not that I don't have common sense, It's because I think like this. I overthink things, when the answer is usually simple. Maybe I take things way too seriously. It probably took Brooklytonia about 20 seconds to read and figure this out... About a week ago, I uploaded an Instructable that I thought would be a HUGE hit. It wasn't. When my Instructable on Dimmable LED Workshop Lighting (Very High Efficiency) got featured in the Newsletter, it got 100K+ views. This is because it was at the top, and it was impossible to miss. When my Instructable on Insanely Bright LED Panel got featured in the newsletter, It got 40K+ views. It was at the bottom left on the email. I figured that it made sense. When my Instructable on Articulating 70W Spectrum-Balanced LED Panel got featured in the newsletter, it got ~10K views. This makes no sense! (I've changed the titles to what the staff changed them when they got featured in the newsletter. Not sure why I remember this...) Dimmable LED Workshop Lighting (Very High Efficiency) - Good title. Good thumbnail. Main Instructable - TONS of clicks - 3K views in less than 10 minutes Insanely Bright LED Panel - Okay title (not my fault!). Fairly good thumbnail. Located at the bottom left - Quite a bit of views Articulating 70W Spectrum-Balanced LED Panel - Good title. Good thumbnail*. Located in the middle. - Not a lot of clicks - 3K views in several hours. WHY? Of course there are several things that differ between Insanely Bright LED Panel and Articulating 70W Spectrum-Balanced LED Panel. But why such a difference? I mean-- I always compare the statistics of my I'bles, and try to make them better. It's usually hard to compare, and surprising. But why is there such a huge difference between two Instructables that are pretty similar? *I changed it a couple hours before it got featured in the newsletter, with the Instructables Pixlr editor. I know it turned ot a bit weird, but it was the best that I was able to do. The Pixlr site has better fonts, but the biggest on was still soooo small. Maybe I did something wrong. Images of before and after: 

Topic by Yonatan24    |  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


SAD sunrise clock, led bulb mod?

I suffer with SAD and a sunrise clock helps a lot getting up in the mornings and winding down at night. I have one similar to this It uses ses 14 bulbs, currently using halogen 42W but these don't last long and I managed to blow one closing a drawer! So, I'm looking for a way to use 10 to 20W leds  but obviously, given its UK mains voltage that does the timed dimming, finding a suitable LED driver is difficult. There are a few out there but I've no idea which ones will work as it need it to. Also, the only commercially available dimmable led bulbs are e27 fit only, very expensive and only 12W, around 400 lumens. I need at least 600. Also the more the better. Looking to use 6400K or higher colour, as the higher temp colours are proven to be better for SAD. I can make electronic circuits and have hacked together/repaired plenty of stuff. I would rather build something than buy as I don't have £££ to spend! Does anybody have any ideas to help me get started? I'm also looking to replace my SAD bulbs, currently 85W cfls with LEDS as well.

Topic by kristyon    |  last reply


Damsel in Distress, Needs 12v DC LED lighting help...

Hello, I am converting a 20' shipping container into a cabin. I have an electrical panel that houses both AC and DC. http://www.progressivedyn.com/all_in_one_pd4000.html What I need to know is what gauge wire to use for the DC lights. (plugs will be AC) I am using 12V DC lights: http://www.aliexpress.com/item/Free-Shipping-3W-350LM-Pure-White-Warm-White-E27-27-LED-5050-SMD-Energy-Saving-Corn/32231665973.html http://www.aliexpress.com/item/Free-Shipping-Dimmable-Round-White-Led-Puck-Light-12VDC-9leds-5050SMD-Super-Slim-And-Bright/717588402.html http://www.aliexpress.com/item/5M-50LEDs-DC12-DC-plug-copper-wire-string-lights-lighting-waterproof-LED-starry-decor-holiday-Christmas/1777662073.html I understand the basics  of wiring but need to know the type and gauge of the wire to use. The longest run of wire will be max 25 feet. I believe I would use red and black wire as that is what is wired into the lights and transformers. Thanks

Question by micro-tainer    |  last reply


High/Low light LED switch

I recently purchase some 3528 300p LED Strip Light so that I can make some under cabinet lighting. I wanted to make my own because I believe I can to it for a much better price and learn something in the process rather than buying an LED light set from a big box retailer. I have a 3 position rocker switch Off/high/low. If possible I would like to use the LED lights in a High/Low configuration. From what I read they make PWM modules that control the LED making them appear to be dimmable, but I do not want to use one of these devices. For the low setting I was considering wiring in a POT or an inline resistor to drop the Voltage to the LED's. On second thought I suspect that this would not work and if I drop the voltage too low this would result in inoperable LED's. By the way I would not be opposed using an inline resistor if this is a good way to reduce the light level Is there some cheap electronic component that will produce or simulate an approximate 50% PWM that I can wire inline with the switch, in effect producing a low lighting mode? I am not interested in using a variable PWM control, I just want to achieve a switchable high/low lighting. I am not familiar with components and I hope you could suggest a few ideas for my project. Some details: The led strip will be ~11 linear ft using 12VDC and about 40W of electricity.

Question by baudeagle    |  last reply


Led Power Supply?

 I am going mad over trying to figure out what power supply I need. I am making an arduino controlled aquarium fixture and plan on using 30x3w leds. From what I understand using resistors could cause fire and I don't want that of course. I like the look of laptop drivers like this one http://www.gapsupply.com/LED-Power-Supply-p/12v-dc-nwp-96w.htm but I cant figure out which one I need. I have seen all the instructables for this and everyone seems to tape 8 meanwell drivers together. I dont want a big bulky ugly mess like that just one power supply to do the job. The smaller and more compact the better. I will be running 2 rows of white on the outside and one row of red in the middle. 10x3w leds per row. each row individually dimmable via ir and tft. here is the led specs. Whites: http://www.ebay.com/itm/390908787444?_trksid=p2059210.m2749.l2649&ssPageName;=STRK%3AMEBIDX%3AIT Forward Voltage: 3.2-3.8V-700MA Luminous flux: 200-230LM Output power: 3w Light Color:  White 6000-6500K View angle: 120-140 LED support:Copper Life time:50000 hours Reds: http://www.ebay.com/itm/310834616296?_trksid=p2059210.m2749.l2649&var;=610229587957&ssPageName;=STRK%3AMEBIDX%3AIT DC Forward Voltage:2.2V~2.8V Forward Current: 600-700mA Output power: 3w Light Color:  White 6000-6500K View angle: 120-140 Any help and ideas is greatly appreciated. Thanks

Question by charles.terhune  


Computer room keyboard light

   I want a dimmable low-wattage led lamp to mount to my computer desk shelf. It will sit above the keyboard, shining diffuse light down but not directly at me.    I could mount it underneath with screws, or have it sit on the shelf above, looking over it.    It'll be powered by 120V 60Hz, so no batteries required.    I have two design problems that I need to solve before I start.    First, I need a diffuse light source that will light up my entire keyboard without blinding me with a direct view. This should be a warm white rather than something bluish or cold, since I don't want to lose my night vision. (I watch movies and do graphics on the computer at night.)    I haven't been able to think of anything that will fit back far and high enough that my slouched posture won't cause a problem. I thought of an opaque diffuser that the light would shine up into, but the geometry seems a little tight.    Second, I would like recommendations for the dimmer control. I want to dim the light right down to nothing, and switch it off, easily and quickly for when I'm stumbling off to bed. It needs to be a bit sturdy to handle my fumble-fingered ways, and quick to find.    I appreciate any suggestions anyone can come up with, and I'll be glad to gab on more about what I want if you have any questions.    The shelf is 28" or more from my eyes when seated at the desk, and about 30 degrees of it is currently blind to me at maximum slouchiness. It sits 6.25" above the desk, and I can easily spare 4" of clearance under it; the only other thing that has to fit there is the keyboard itself with a little wiggle room.

Topic by Trelligan    |  last reply


Aquarium LED driver?

Im looking for a schematic that controls 1w leds for my fish tank light? i need the control to be dimmable and hopefully programmable so i can incorporate a sun motion effect and then a moon motion effect! i say hopefully because this will need to be an add on later in the project as id like to have the initial lighting up as quickly as possible! As far as i know so far, the circuit is a basic constant current circuit but  i need a "buck" driver or PWM to enable the dimming by varying the current! so my questions are :- 1. Does anyone know of a simple, reliable and cheap circuit to use? 2. Because of the amount of LED's ill be using im not sure i like the idea of having all the lights in a series configuration because if one fails, thats a lot of lights to test! 3. If i have to use a computer to run the lights id like to be able to make it compatable with the raspberry pi therefore id need a program and mounting software for the pi, so anyone know of one? 4.Right to the power, i dont care what voltage it runs on but id like to only utalize one plug socket if possible, i do have a few power supplies laying about for various things like old laptops and old pc's, so what do i need to power it! i cant think of any more at the moment but you guys know what im trying to achieve so im sure you know what questions i have missed! as i said though, id like to start simple and work up to sun motion control and timers! Thanks in advance for any help anyone is offering! 

Question by Xmortx114145    |  last reply


Matching 700mA constant current driver to 20mA LEDs? Answered

Hello all: Ultimately I'm trying to drive upwards of 100 3mm white LEDs in an art project with dimming and a connection to 120v AC power (this is for a chandelier). I've been playing around with some constant current IC driver like the Supertex CL2 as well as 5 and 12v power supplies but I've been looking for a dimmable solution with a small form factor. I picked up a Robertson constant current LED driver but it outputs at 700mA, I assume because it's intended for 1W or 3W LEDs needing the higher current. Is there a circuit design that I can use like a current divider to drive smaller loads with this supply? My current thinking is as follows: 1) I could simply load 35 parallel strings of LEDs since 700/20 = 35 (of an appropriate voltage drop probably between 9v-15v) and rely on the equivalent resistance of each string to act as a defacto current divider. 2) I could do the same thing but with an in series resistor of some value for each string, the constraint being that increasing the resistor will reduce the number of parallel strings and I may need relatively high wattage resistors if I'm driving 9+volts of LEDs on each string. 3) I could do a smaller parallel current divider, but I'm not confident in my math analyzing the ratios of the resistors to achieve this (for instance if I had only two parallel loads and one was drawing 20mA and the other the balance of 680mA the resistors would have to have the same (inverted) relationship i.e. 34:1...to say nothing of the wattage through the 680mA line, which might be as high as 6-8 watts depending on voltage. Is that right? Are there any other clever solutions I'm not thinking of? Obviously I could buy a lower current driver (and I may ultimately)  but even the lower current options are at 350mA, so the same problem will exist at a smaller scale. Thanks everybody for thinking about this, I look forward to seeing your thoughts!

Question by michael.pokorny.54    |  last reply


Bad mice gone good

I originally posted this as a collaboration. Turns out it's better as a forum item, which may eventually evolve into a collaboration. I'll try to put up at least one image this weekend. Meanwhile, settle in for a bit of a read, and let me know what you think.. . . . . . . Ingredients:- About 2 dozen half dead or completely dead Apple USB mice, mostly black, some white, bundled and hung to age.- 8-10 Apple keyboards, some flavored with cola or hot chocolate, mostly black, some white.(Randofo may contribute more, we'll see what comes of this caper. See his keyboard hack.Optional additives:- Dead hard drives, also part of the job. I've been wanting to figure out how to hack the controllers and drive arms to make a sculpture that waves the arms vertically, in controllable ways. I don't know yet if this is a separate project or not.- Glue, solder, etc.- Other junk, hopefully minimal, unless it adds a whole new level to the project.StatusI gathered them by their USB connectors and hung them as sculpture, (photo coming soon) awaiting further inspiration.The ProjectFirst idea:Wire, (or rewire, in this case) the LEDs inside the mice, and make a decorative chandelier.Minimalist that I am, my first impulse is to leave the mice as original and intact as possible, while transforming an everyday object into something delightful and interesting.Current questions:- How to wire them all together, without making it a life's work?- Static or dynamic? Dimmable? Random "flickering/fading" like the new smarter Christmas lights, only more interesting?- Interactive? Respond to sound, temperature or other environmental changes? I like the idea of cause and effect resulting in some new information the observer can come away with, something that actually makes sense, rather than, "That's kind of interesting, but what for?"- Networkable?? So other Bad mice gone Good can influence behaviors?- Some sort of reference or action to the original intended function, i.e., input device, man-machine interface, 21st century worker harness, pixel pushing device, etc.- Hack a keyboard to control the mice? Force them to spell?? I like the idea of subverting/reversing the input/output direction.- use the reflective sensor in the mouse to provide input/output.- Influence Jonathan Ive and his brilliant staff at Apple to put some effective strain relief on all new mice!RulesAnd I use that term fairly loosely. Yet I find that good parameters, even if arbitrary (an affordable luxury with art and fooling around projects) help define the project, keep it manageable, and hence more likely to be completed. Sometimes it's just more fun too. I'll refrain from an essay on that for now. (hm, maybe an essay section would be good Instructables feature request?)- simple- can be made in 24 or fewer work hours.- cheap, with minimal non-salvaged parts.- repeatable, so others can create their own, in the fine, albeit young, Instructables tradition.- finished product is fun and delightful to most people, old or young, geek or non-geek.FeedbackPlease let me know what you think of this idea so far.New ideas, spinoffs, etc. are welcome. Please link or keyword all of them so we can see the connection between projects.Enough for now, I need to overhaul my resume so I can find a more interesting and creative job. SF Bay Area queries are encouraged!

Topic by Marcos    |  last reply