Take a tour through the world of the light-emitting diode. Learn - who invented it, how to use it, and how to make your own. Collin Cunningham: People are fascinated by light. I mean just glancing over at a display of flashing lights can grab my attention. Do you ever remember sitting around a campfire? Staring at the flames and just being totally transfixed, almost like if you're watching TV. It's comforting, and it can even by hypnotic. Recently, technology has made creating light a whole lot easier to do. For that, we have this little guy to thank. The light emitting diode, or LED for short. LEDs have a lot of different uses, from a simple power on indicator to traffic signals. LEDs use about ten percent of the energy of a traditional light bulb, and they can last about thirty times longer. That makes them a pretty big hit with businesses looking to do large scale visual communication. The first person to ever report the effects of a light emitting diode was researching another form of communication. In 1907, a man by the name of H. J. Round was researching radio waves for Marconi Labs. He was using a device called a cats whisker detector, which no, does not contain any cats or part of cats. Round was searching for a sweet spot on a crystal silicon carbide when he noticed something odd. Part of the crystal started to glow, it lit up a pale yellow, and that was an LED. H. J. Round's crystal experiment was so cool and simple that I had to try it myself. So I got a piece of silicon carbide, then I hooked that up to the positive lead on my power supply. That's an alligator clip. I hooked a little sewing needle to the ground on my power supply. Then I began to search for light emitting zones. I built my own sort of cats whisker detector in order to keep the needle in place on a particularly bright spot I found. Now I can sit back and enjoy the warm glow of a homemade LED anytime I choose, even though it's pretty dim, but it's still cool. As far as we know, Round's research into light emitting crystals ended here, which is a shame because he was definitely on to something. But of course that's not the end of the story. Fifteen years later, in imperial Russia, a scientist and inventor named Oleg Vladmirovich Losev noticed that certain diodes in radios started to glow a bit when in use. Losev conducted a lot of heavy research and published his findings in several languages. But, sadly, they seem to have gone unnoticed. It wasn't until 1962, that a visible light emitting diode was made practical by Nick Holonyak working at General Electric. He's widely known as the father of the LED. The technology that Holonyak brought to the public is remarkably similar to our crystal experiment. A thin metal wire connects one side of the circuit to a small piece of semi-conductive material on the other side. The LED's two leads are cut to different lengths to show you how it should be connected. The longer is called the anode, and that connects to positive. The shorter is the cathode, and that goes to negative. To power an LED, you can just use a simple coin cell. This is a CR2032. And just make sure the longer lead is on the positive side, which is wider and smoother, and negative is on the other. If you plan to use a battery, let's say a nine volt, you'll also need a resistor to limit the current so we don't burn out the LED. Connect negative to the cathode, the shorter lead, and we'll put a 470 ohm resistor between the positive battery and the anode. For more useful info, check out the LED Center, and there's a lot of great history at the LED Museum. For all types of project ideas, info, and inspiration head over to Makezine.com.
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Ghostly International presents: OSBORNE.
To celebrate Osborne's self-titled album, we'd like to offer you a glimpse into the world of Todd Osborn. In this small vignette, Todd lets us in on his music, hobbies and personal life.
Osborne,Spectral,Ghostly,Ghostly
Swim,Rephlex,House,Techno,Ypsilanti,Michigan,Plane,Drive-Thru,Tadd
Mullinix,Dabrye,DJ
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iPartyTv.com & Big Shotz Ent. Presents: "MOVIE NIGHT"
iPartyTv.com brings you the pre-party promo video for December 17th "Movie Night" Party in Harrisburg, Pa! Produced By: TJ "@TJtheDIRECTOR" Smith
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FAMEAZ.tv/fashion/news/ Encore24 & U7 presents...
Freak Fashion Show Halloween Edition Bri Bridge Vs The Fashionist! Az fashion what more can I say check it out.
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How to Draw Manga Hair pt2 Miki Falls by Mark Crilley
http://www.amazon.com/Miki-Falls-Spring/dp/006084616X --"Miki Falls" manga creator Mark Crilley presents a second video on how to draw manga hair, this time focusing on the details of drawing the hair of a female character. Thanks for the honors on this video, friends! #1 - Top Rated (Today) - Howto & Style #1 - Most Discussed (Today) - Howto & Style #2 - Top Favorites (Today) - Howto & Style (April 13, 2008) If you've found this vid useful (and would like to help a guy feed his family!) I'd be honored if you'd consider picking up a copy of Miki Falls. It's available at Amazon right here: http://www.amazon.com/Miki-Falls-Spring/dp/006084616X If you'd like to get it at a real bookstore, please remember that even bookstores that don't carry Miki Falls will happily special order it for you if you ask. Thanks for the support, my friends! --mark
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HOW TO CUT YOUR HAIR and get the perfect haircut
I bought my siccors at my local beauty supply store , just make sure to get ones that are made for hair cutting! *In the past it was very hard for me to grow out my hair as long as it is now. Because for some reason the hairdressers would always literally cut way too much off, it's almost like they don't know the difference between 1 inch and 7 inches. To them it's almost as if they mean the same. Which got me quite annoyed. I've been to countless hair salons in my life, I was never happy with any of the results. And they would never understand exactly the type of hair cut I WANT! And in the end I was left angry by the fact that I had to pay so much for results that were horrible and even a tip on top of that? Like come on??!!!.. So this is why , I was so determined to figure out a way how to cut my hair all on my own the exact way and style that I want. And now , I'm sharing this with all of you who are sick and tired of hairdressers always giving you a bad haircut. HOW I STRAIGHTEN MY HAIR http://www.youtube.com/watch?v=W1okpRdegCY HOW I BLOW DRY MY HAIR http://www.youtube.com/watch?v=Um1zIa-rfq4 Where do I get the best deals on beauty tools at? http://www.FlatIronExperts.com/?Click=2494 5% Off any purchase use code: ROSEBUD ~~~~~~~~~~~~~~~~~~~~~~~~ Letters? Presents ? Post Cards? Anything you'd like! can be sent to my Fan / Business mailing address at : Rose Russo 5175 Yonge Street, Suite # 143 Toronto, On M2N5P5 CANADA You can also find me @ Facebook Fan Page http://www.facebook.com/R0SEBUD143 Twitter http://www.twitter.com/missroserusso Subscribe if you havn't, to be the first to know when my next video is coming out :) Love you! xoxox
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Option-Selectcom Presents Cody - SSF4
Please see www.option-select.com for a full transcript and visit www.option-select.com for tutorials, match videos, and more. Follow us on Twitter www.twitter.com Friend us on Facebook: www.facebook.com
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SSFIV
SSF4
Super
Street
Fighter
IV
Option-Select.com
Option
Select
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Tutorial
Guide
Ryan
Hunter
Games
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Universum Travel Presents Ohrid Macedonia
Some of the peaceful places you will see on this great trip to Ohrid, Macedonia! Universum Travel is an open door for all who are seeking an opportunity to experience an unforgettable adventure -- to feel the magic of the holy, ancient places, to build a bridge between past and future, to fulfill your dream for a sensual vacation, which will recharge you with new strength, to let go of everything that has burdened your everyday life, to communicate with others... and with yourself in a cozy and friendly atmosphere. We are not trotting from one monument to another. Our goal is not to show you more, but for you to experience more; to feel, not simply to learn and see something new; to try to break your own frames by embracing the challenge to overcome your fears and achieve your unlimited potential. Everyone seeking to travel outside, as well as inside themselves, will most certainly find with us something to their liking! To join us in our trips - just contact us: info@universum-travel.com For more information You can visit our webpage: www.universum-travel.com
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охрид
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