Violet Voltage?

Every so often, I see "violet ray" electrotherapy devices come up on ebay. They often sell for silly money, but occasionally one will sell for only a few pounds.Originally quack medical devices, they seem to operate in a similar manner to a plasma globe (gas discharges, high voltages). Does anybody know how they work? Is it worth getting hold of one to rip the innards out to get at the high-voltage supply?(Yes, I know they have "adult uses", but, really, it is the innards I'm talking about)

Posted by Kiteman 10 years ago


1 watt Frequency Doubled Violet Laser

I want to make a 1 watt violet laser, by using a 1 watt 808 nm laser and channeling the laser through a KTP crystal. Judging from my humble knowledge of second harmonic generation, That should create a 1 watt violet laser beam. Correct?

Posted by Nexoid 7 years ago


UV Surface Mount LEDs

I am currently modifying an iBook G3 so that, among other things, it will be fluorescent orange. Currently, when the computer sleeps, a white LED illuminates through the casing. Since the casing will now be fluorescent, I would like to replace the white surface mount LED with an ultraviolet one, so that the case will glow as the computer is sleeping. I was wondering if someone could help me out by telling me where I might be able to purchase an ultraviolet surface mount LED? P.S. The image included will be stenciled and mirrored on each side of the apple on the top of the iBook.

Posted by Ora 10 years ago


rgb led uv usb light that responds to music for a DJ

I wanna build a light to plug into my laptop powered by usb thats UV led's to light the keyboard and have either changing to red light or multi-colored lights. Or just keepin it UV and strobing

Posted by ddude04 9 years ago


What do you think of my marker doodle?

The pic below took a pretty long time. Let me know what you think!

Posted by Flumpkins 9 years ago


UV LEDs for Sanitation

Would UV LEDs be suitable for sanitation purposes? If so, does anyone have information on how many, of what type, and how long exposure is required for different materials? Thanks!

Posted by Weissensteinburg 9 years ago


Identify resistors? - well, sort of

So, i have a bunch of project that i want to do, i have schematics and the parts (but i don't know what the color bands of the needed resistors are) Can some one give me a link to a utility converting numbers (470 Ohm) into color bands (yellow, violet, brown) please help/reply! thank you!

Posted by Sandisk1duo 10 years ago


Laser Sonic Screwdriver - Thoughts?

So, my sister is currently a senior in college, planning on being a high school English teacher next year. She's also a Doctor Who fan. She wants me to make her a laser pointer in a sonic screwdriver case, for pointing at the projector screen, white/chalkboard, loud students, Daleks, etc. The case itself I plan to buy, probably this, and then mount a blue laser diode in. Two three questions: 1) Does anyone have one of these screwdrivers, and are they big enough to put a couple AAAs in? I'd rather not have to replace button cells every week. 2) What's the best way to get a blue or violet laser diode? Blu-Ray assembly? You can get a blue-violet laser pointer for $20 off DealExtreme, but my experience with cheap laser pointers is they burn out quickly. 3) Would I need to come up with an actual driver, or would an appropriate resistor be enough? And can a blue diode be powered off two AAAs?

Posted by CameronSS 7 years ago


Will I die if I eat "methyl blue?" (Or will my pee turn blue?)

Because who doesn't want to have blue urine? :PI can remember guzzling food coloring to get the effect, but then I found this. My question is: Will Methyl Blue give the same effect as Methylene Blue? The MSDS says that methyl blue "may be harmful if swallowed," but that pretty much goes for anything. Wikipedia makes a point to say that "Methyl blue should not be confused with methyl violet or methylene blue, two other stains," and so I know that they are different. How much different is the question here.Btw, methyl blue is available at your neighborhood pet store in the aquarium section as brown, granular crystals.

Posted by carbon 11 years ago


battery life

Any one know about how long 4 double a's wired in series will last with a 200 milliamp load, here is what the online LED calculator said, I'm working on putting this in a small flashlight:Solution 0: 1 x 2 array uses 2 LEDs exactly +----|>|---/\/\/----+ R = 27 ohms +----|>|---/\/\/----+ R = 27 ohmsThe wizard says: In solution 0: each 27 ohm resistor dissipates 270 mW the wizard says the color code for 27 is red violet black the wizard thinks ½W resistors are needed for your application together, all resistors dissipate 540 mW together, the diodes dissipate 700 mW total power dissipated by the array is 1240 mW the array draws current of 200 mA from the source.-thanks

Posted by firemanfu 10 years ago


[HEADPHONES] Y-Part Cable Fix

Hi guys! I've read quite a lot of threads on this, but could not find anything related to my problem. I need some help with fixing my headphones. I've managed to break them exactly on the Y part where Left and Right headphones connect to the main cable. I want to solder them however not sure how to connect separate cables... I have a small schema here: http://i58.tinypic.com/24vnptf.png Please note the Copper(orange) and the Blue(Blue) are together: blue is in plastic? coating with wrapped copper around but its two separate wires. Also, the magenta/violet on the diagram represents a white wire, All of the other cables except blue were coated in enamel?. The headphones have a built-in microphone with a button and its sony mdrzx610 model. I really hope there's someone to help me out I need my sounds back!

Posted by KevinasB 3 years ago


The Contest Purple

Original Melzy Creations wants to see your original purple creations! ANY PROJECT THAT IS PUBLISHED THAT IS PURPLE IN COLOR IS ELIGIBLE FOR A PRIZE FROM MELZY! A symbol of good judgment, meditation, and most importantly, figs, we think purple represents us really well. We use it in our ingredients and all of our branding, but we want to see what you can do with it! Do you have a fig’n awesome recipe for purple plum pie? Maybe you’ve got a killer tutorial for a purple dinosaur costume, know how to construct a lifelike replica of a sea urchin, can build a robot that shoots violet laser beams from its eyes, or you’re just looking for an excuse to paint that sailboat you built last summer a nice shade of electric indigo. Whatever it is, we want to see it! Anything goes as long as it’s purple. The contest will be open to step-by-step, photo, and video Instructables, with bonus points for those who incorporate figs into their project. It doesn’t matter whether your work is old or new, as long as it’s yours to share with the world. Go ahead and get started, we can’t wait to see what creations you come up with! Check it out!

Posted by audreyobscura 5 years ago


I've picked a "starter set" of LEDs and accessories - Looking for advice

Hi Everyone... I'm looking to get into a bunch of random LED projects so I need some LEDs and various accessories. I've done soldering and such in the past, so I have a soldering iron (cold heat) and solder and flux... but I'm wondering if this is a good set of starter equipment and if the prices are decent...any suggestions or comments are welcome...(all items are from www.besthongkong.com)Blue LED - 20 Degree Clear 9000mcd - 20 count - $7.60 (unit price is 0.99 under ten items)Red LED - 20 Degree Clear 14000mcd - 20 count - $9.80 (unit price is 0.50 under ten items)Pure Green LED - 20 Degree Clear 30000mcd - 20 count - $9.00 (unit price is 0.56 under 10 items)Ultra Violet LED - 20 Degree Clear 400-410nm - 20 count - $7.00 (unit price is 0.35 under 10 items)5mm Red Piranha LED (This is a wide-spread LED with 1000-1500mcd output) - 10 count -$5.00 (unit price is 0.62 under 10 items)Set of 10PCs 3mm Plastic LED Holder - $1.50 (50 cents for each 10 pieces, ordered 3)6 inches of Heat Shrink - $1.90 (19 cents for each 6, ordered 10)100 ohm 1/4 Watts Resistor - 50PCs - $0.50220 ohm 1/4 Watts Resistor - 50PCs - $0.50470 ohm 1/4 Watts Resistor - 50PCs - $0.50I didn't order any wire because I figured I could just pick that up anywhere around here.Total Cost - $43.30Shipping - $5.50Grand Total - $48.80

Posted by Sirckus 11 years ago


Sci-Fi Gardening

I read an article on Dave's Garden a year ago on plants with Star Trek names, and I just adore the idea of having a science fiction themed garden.  Looking through some more plants, I've come across even more plants that would fit within a sci-fi/outer space theme. Coleus: Darth Vader Saturn Saturn's Rings Solar Flare Solar Shadow Solar Sunrise Vulcan Daylily: Alien Alien Contact Alien Encounter Alien Escape Pod Alien Invader Alien Landing Alien Skin Alien's Eye Android Android Dreams Andromeda Asteroid Astral Voyager Beam Me Up Beam Me Up, Scotty Ben Kirk Big Dipper Black Hole Borg Technology Cloaking Device First Officer's Log Galaxy Quest Klatuu Barata Nictu Life on Bajor Notify Ground Crew Photon Torpedo Romulan Deflector Spock's Ears Vulcan Logic Hosta:   Captain Kirk Enterprise Foxfire X Philes (just for fun) Galaxy Galaxy Light Gamma Ray Kiwi Milky Way Little Dipper Lunar Eclipse Lunar Orbit Lunar Sea Outer Space Saturn Starship Striker Super Nova Venus Voyager Vulcan These lists are not complete.  I looked through 5,320 daylily names out of 38,449 on Dave's Garden and then filled in with some names from the article, and I'm sure there are more genuses with sci-fi plants.  The reason why there are so many hostas, daylilies, and coleuses is because they're relatively easy to hybridize and propagate.  I started looking through African violets, but half-way through I was pretty sure I wouldn't find any.  I wouldn't be surprised if there were some more in the Liliaceae family such as with tulips, but phew, that's a lot of plants. Looking through some of the names, it would be relatively easy to do a Lord of the Rings or fantasy-themed garden.  I even found hostas called "Dot Com" and "Website".  Hybridizers certainly get creative when it comes to names.  I think I'll send my brother-in-law a hosta called "Twisted Sister". The image is of a basket plant I have.  No neat name, but it looks kinda sci-fi in the picture.

Posted by AngryRedhead 8 years ago


Graffiti artists replicate The Matrix on Instructables.com--and win $15,000 Universal Laser Cutter!

Instructables and Universal Laser are happy to announce that the incredibly creative Instructable, How to Enter the Ghetto Matrix (DIY Bullet Time) has won the Grand Prize in the 2008 Instructables.com and Universal Laser Cutter Contest: a 40-watt VersaLaser laser cutter valued at over $15,000!Grand Prize Winner How to Enter the Ghetto Matrix (DIY Bullet Time) How to Enter the Ghetto Matrix (DIY Bullet Time) provides an extremely detailed Instructables tutorial on how to build a cheap, portable special-effects rig to create "bullet-time" animations--a technique, popularized in The Matrix movies, where the audience's point-of-view moves around the scene at normal speed while the action on screen is slowed down."We want to inspire great ideas and provide skills, tools, and shared know-how," Instructables CEO Eric Wilhelm explained. "This project represents exactly what we're trying to achieve with Instructables."The DIY Bullet Time Instructable was created and documented by the Graffiti Research Lab, an open-source urban art and communication collective supported by the Free Art & Technology Lab, a Brooklyn-based non-profit research lab creating work at the intersection of popular culture and the public domain."This will be the cornerstone of our new lab space," said GRL member fi5e. "A whole crew of creative people are really excited to put this thing to use! Thanks for helping us bring the VersaLaser to Brooklyn."The winner was chosen by votes from Instructables users and our panel of expert judges, who reviewed the 14 finalists drawn from a pool of over 600 entries. Congratulations to fi5e and everyone at the GRL - we know you'll really put the VersaLaser to work, and can't wait to see what great things you make! First Prize(in alphabetical order) Autonomous Foosball Table Blu-Ray Laser Phaser! Build a Greenland Kayak Build a Wind Harp! Build yourself a portable home - a mongolian yurt Extreme Business Cards Giant Fresnel Lens Deathray How I built a carbon bike frame at home (and a bamboo frame too) How to Make a TRON Style Lamp: The MADYLIGHT How to build a sit down driving arcade cabinet Laser cutter, start slicing stuff for under 50 dollars Laser Image Projector The Spiral Data Tato -- A Curiously Complex Origami CD Case Second Prize The authors of these Instructables win a robot t-shirt and a laser-etched plaque. Listed in alphabetical order. 30 minute USB microscope The Ambience Enhancer Autonomous, Wirelessly Controlled Hovercraft Conductive Glue And Conductive Thread: Make an LED Display and Fabric Circuit That Rolls Up. Cool Wave Ring Dollar Store Parabolic Mic Handcut inlay A Home Power Plant - Wind Power Generator Revised How to Make a Color-Changing Lighted Faux Fur Scarf How to make a pair of Angel Wings How to Make an OAWR (Obstacle Avoiding Walking Robot) Make DIY Vanilla Extract "Quicksilver" Retro-Future Scooter from appliances and scrap metal Solid Wood Digital Clock The Stirling Engine, absorb energy from candles, coffee, and more! Squishy Breast Stress Relief Toy TiggerBot II Robot Tube Amp Rebuild (and Mod) U-Disp - The Digg (tm) display (Open Source)Wooden Gear Clock Expert JudgesTo help us judge, we assembled an amazing team of expert designers, engineers, hackers, journalists, scientists, technologists, and other really smart people. They spent hours examining each of the finalists Instructables and helping us make a decision. We'd like to send a huge "Thank You" to each of our incredible judges. We couldn't have done it without you.Violet Blue (author, blogger, podcaster, columnist, and SRL vet)Gareth Branwyn (Contributing Editor, MAKE Magazine)Zoz Brooks (Host, of the upcoming TV Show Prototype This)Joe Brown (Editor, Wired Magazine)Colin Bulthaup (CTO of Potenco, co-founder Squid Labs) David Calkins (Co-founder of RoboGames) Julia Cosgrove (Deputy Editor, ReadyMade Magazine)Chris Csikszentmihalyi (Professor at the MIT Media Lab, Computing Culture Group)Simone Davalos (Co-founder of RoboGames) Lenore Edman (Evil Mad Scientist Laboratories)Dan Goldwater (Founder of monkeylectric, co-founder Squid Labs)Saul Griffith (President of Makani Power, co-founder Squid Labs, MacArthur Fellow)Duncan Haberly (Instructables)Matthew Hancher (NASA Researcher in the Intelligent Systems Division)Brian Lam (Editor, Gizmodo)Ed Lewis (Instructables)Jeffrey McGrew (Designer, Because We Can)Chuck Messer (Tackle Design, The Open Prosthetics Project, host of Discovery's Smash Lab)Megan Miller (Editor, PopSci)Jim Newton (Founder of TechShop)Quinn Norton (Journalist)Windell Oskay (Evil Mad Scientist Laboratories)David Pescovitz (BoingBoing, Institute for the Future, MAKE Magazine)Cloude Porteus (Instructables)Randy Sarafan (Instructables, Eyebeam Resident)Peter Semmelhack (Founder of Buglabs)Tyghe Trimble (News Editor, Discover Magazine)Noah Weinstein (Instructables)Eric Wilhelm (CEO of Instructables, co-founder Squid Labs)Dan Woods (Associate Publisher, MAKE Magazine) For the full information on how the winners were chosen, click here.

Posted by ewilhelm 10 years ago