0
votes
1answer
116 views

Most lumens per watt

I recently started designing a pcb for flashing lights I want to use in a pavillon at festivals, garden parties and the like. Now my question is, can anyone tell me which kind of LED that has the ...
6
votes
1answer
1k views

How do filament LED bulbs work, looking very similar to incandescent bulbs?

Filament LED bulbs use very narrow strips containing the LED, which look similar to filaments of an old incandescent bulb. Here's a good picture: http://www.aruana-led.de/ They look like a normal ...
1
vote
2answers
145 views

Power LEDs from wall outlet without transformer plug?

I want to power part of an LED strip like this one: http://www.amazon.com/Lighting-EVER-Flexible-Waterproof-Ultimate/dp/B005JR1NUU ... from a standard US wall outlet. I don't want to use a bulky ...
1
vote
3answers
203 views

Cannot find GND on 7 Segment Display Datasheet

I'm trying to use a 7 Segment Knightbright LED Display, however, after careful study of the datasheet, I'm unable to find what I believe should be the GND pin to power a segment! ...
2
votes
2answers
282 views

A big flashlight, nothing special

I have a little problem: as I said I want to build kind of a big flashlight. With LED's and stuff. I already know some things I need, LED's of course, a battery case, a switch and stuff.. but my ...
5
votes
3answers
4k views

Which SIPO chip is better, 74HC4094 or 74HC595 or something else?

I want to drive lots of LEDs in a spinning persistence-of-vision (POV) device. I need one output pin per LED, because matrix techniques don't work right in spinning POV devices. A serial-input, ...
14
votes
6answers
411 views

Keeping those IR LEDs

For all the other stupid things I often do, I've found ways to boobytrap myself. For example keeping my wallet on the floor where the door opens - I can't help but stumble on it when I leave the ...