Tagged Questions
0
votes
0answers
112 views
How can I close the circuit on a string of christmas lights cut in half [closed]
I need to take a 25 foot long Christmas light string and cut it into a 3rd of its size so I can have an 8 foot string. I have already cut the end with the male plug to 8 feet, and I'm now having ...
2
votes
1answer
62 views
Creating an LED array light box
I'm wanting to make a light box of sorts from LEDs and wanted to run it by you to confirm I have the right idea...
I have ordered 500 super bright LEDs off eBay and want to wire loads of them ...
2
votes
2answers
126 views
Energy-efficient LED driver circuit
I want to light a normal LED for as long as possible on two AA or AAA batteries. It does not have to blink or so, just stay on. The LED doesn't have to light at the max, as long as it's visible from ...
0
votes
1answer
115 views
virtual light communication
I have to design a project that uses an LED to transmit data and a LDR to receive the data or signal from the LED. But the problem is I have to use two Arduino UNO boards, one for LED transmit and ...
6
votes
3answers
426 views
Continous light - do LED s flicker like fluorescent lights?
Continous light - do LED s flicker like fluorescent lights?
Under flourescent light there is a flicker.
As i understand LED work only with DC current, thus they have a AC to DC transformer circuit ...
-1
votes
1answer
118 views
LED RGBW Lighting, Will this Design work?
I've got this schematic for a very small lighting setup for my basement. The goal is to have two fixtures that have red, green, and blue lights that can be controlled with knobs on a Separate ...
4
votes
2answers
380 views
Basic circuit to keep LED either on or off depending on night/day
How can I have a LED either on or off (not in between) depending on night or day with basic electronics? I have created the circuit below, but it only shines and in darkness it dims.
The ...
0
votes
2answers
200 views
LED brake lights - detecting voltage drop?
I am trying to light up some LEDs on my Rustler VXL RC car only when braking/reversing.
I found out that on my receiver I have three wires: black(-), red(+), white(+). The one that interests me is the ...
1
vote
1answer
728 views
Building a 3x3x3 LED cube?
I need to built a 3x3x3 LED cube. I need to be able to turn every LED on (not at the same time) in different patterns. I need to use Charlieplexing (note that any other method is not a viable ...
6
votes
3answers
248 views
How can I achieve very bright light?
I'm not sure if this is right site for this, but couldn't find better.
I've been given an task to create something that has light intensity like police beacon. I need it to be cheap, so I'm looking ...
4
votes
1answer
232 views
What type of method for producing White-Light LEDs is the most common?
There are two primary ways of producing white light-emitting diodes (WLEDs):
To use individual LEDs that emit three primary colors red, green, and blue and then mix all the colors to form white ...
3
votes
2answers
261 views
What type of LED lights are needed for detecting retro-reflective markers for motion capture project?
I've a project in which I want to add 10-12 led lights around webcam's lens so that the camera can detect retro-reflective tape in it's viewing area.
How this process works is something like this. ...
1
vote
0answers
135 views
How to deal with mains/grid spikes?
Sorry if this is the wrong place. I thought it fit better here than DIY Stack Exchange.
I replaced a 230 V halogen light bulb with a 6 LED package. Now I notice that all the LED's blink every 15 ...
7
votes
1answer
311 views
How is an LED constructed, is it possible to build my own
I wondering if it would be theoretically possible for me to build my own led or oled. I am aware that this is not very practical, I'm more interested just as an exercise. I understand the basic theory ...
1
vote
1answer
1k views
How could I replace the lamp on a regular projector for a LED lamp?
I have a 1080p projector and I want to change the regular 230w lamp for a LED lamp that uses less energy and lasts longer.
How complex would this be? LED projectors with these specs are ridicously ...
4
votes
1answer
963 views
What are the relevant parameters for a reverse-biased LED light sensor?
Following this appnote (PDF) on using photodiodes, I'm connecting an IR LED as a light sensor and emitter, configured like this:
To emit light, I pull PIN1 high ...
4
votes
3answers
440 views
What's the problem in designing a bright enough LED lamp?
So far the most powerful household LED lamp I've seen had consumption of 2.1 Watts and gave light equivalent to maybe 15-25 Watts incandescent lamp. That's maybe good for illuminating a Christmas ...
8
votes
1answer
189 views
LED current while off
I have a vague recollection that while off, a LED can actually receive light and generate a small current (in uA).
Is that correct? How does that work? What is the best way to prevent this?
4
votes
5answers
428 views
Need comments and ideas for LED flashlight project
I'm thinking about making a simple LED flashlight.
After doing some research, I think I'm going to use some 5 mm 12 Cd white LEDs with 3.6 V drop which can pass 20 mA. I'm not yet sure how much ...
4
votes
2answers
1k views
LED Driver for 300mA LEDs
I'm trying to put together a project with some bright LEDs but I'm not sure how to control them. Ideally I'd like to drive about 64 of these LEDs that have a forward current of 300mA and voltage drop ...
8
votes
4answers
738 views
Car Tail light - why the extra components?
I'm replacing the LED in a car tail-light. Naturally, it will run off 12V (battery) but the circuit I have uses just an LED and a 0.6w (440ohm) resistor. But the existing circuit includes two, larger ...
3
votes
3answers
489 views
How do I build a cheap/efficient mains adapter for some LED lighting?
I've been considering building some LED lights to replace the mains-supplied lights in my house (as a more efficient alternative). For it to be worthwhile though I'd need to build an efficient UK ...
21
votes
3answers
2k views
