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

Does anybody know what type of flower this is? Answered

 I went shooting photos for subjects for my Summative Art Project, and i came across this flower. Its pretty, =P and I'd like to know what it is.

Asked by FunkNattidelic 8 years ago

An ultra violet LED and a photo transistor? Answered

I've got this Ultra violet LED and a  photo transistor.Please give me a circuit to make this transistor detect the ultra violet and do some function such as lighting another LED. 

Asked by Adarsh_tronix 5 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

Where can I get full UV LEDs? Answered

I need some full ultraviolet LEDs for a project. I've found some, but they don't output light completely in th UV range. These lights also put out visible violet light; I need them to give me invisible UV light. The wavelength that they put out needs to be around 300nm-350nm. Thanks.

Asked by DIY Emilio 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 could I use to blend into glass to block UV light? Answered

What could I use to roll red hot glass into(so it will stick to the glass) that will help it block ultraviolet light(aside from broken/crushed glass that's already UV resistant) and will let the glass stay relatively clear and colorless?

Asked by The Ideanator 8 years ago

DNA Plasmids for use in transformation of plant cells? Answered

Recently, I found a kit to transform E. coli with GFP (green fluorescent protein) plasmids, causing the bacteria to fluoresce under UV light. I later found a kit for maintaining an African violet tissue culture, sparking the question if it would be possible to use the plasmids intended for use in E. coli in the African violet tissue, causing the violet tissue to fluoresce, which can then be transplanted to grow into a full glowing violet plant. Would the plasmids be usable in transforming the violet tissue, or would they be specialized to just the E. coli?

Asked by ALogan97 6 years ago

Harbor Freight 9 LED polarity.

Https://!!/I want to use that flashlight, and mod it to a different colour led but I need to know if the pbc board has polarity.

Asked by Noodle god 9 years ago

change a cheap laser pointer color? Answered

I got a cheap laser from the shop. here is it : It is red. Is there a way i can make it green, blue, purple, yellow ,etc. ? and another one: How can I focus a led on a single spot to be like a laser?

Asked by netbus 8 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

Why do the constituent of white colour have different wavelength?

When white light passes through a prism,it is splitted into its constituents colours due to the difference in the speed of different colours in prism.the colour which has more speed is deviated most(red)and the colour having less speed deviates least(violet).thus,white light is splitted. we know that wavelength is directly proprtional to speed. The question is why the wavelength of different colours differ from each other?and why does the wavelength of red colour is longest and of violet colour is shortest? 

Asked by vmkverma 7 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

What is a way to make your room look really pretty? Answered

I have to clean it, but I'm tired of the same stuff. Are there any decoration ideas that could be used for organizing my bits and bobs? My room is violet, with green and white accents. Thanks!

Asked by bongo girl! 6 years ago

What is the difference between types of film??

Could you tell me the difference between ultraviolet film (or is the the same as regular film just using an ultraviolet filter) and inferred? I have seen instructables about turning your camera into inferred or ultra violet cameras. I know nothing about this subject.

Asked by rookie1 8 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 9 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

I am making a blue laser pointer can i use this diode with this module?

Diode- module- Iwill run the laser at 100 millawatts.

Asked by DELETED_cdousley 8 years ago

HELP!!! Led buying blunder. any ideas?

I've just purchased 100 leds for ten pounds. Woo. Just about to heat up my soldering iron, and BUGGER. I realised that instead of buying 100 ultra bright white leds, I've bought 100 ultra bright U.V. leds. (No wonder they were so bloody cheap!) I need ideas for a project. I suppose I could just make a big assed black light and rave the night away while getting a healthy dose of arc eye, but where's the fun in that...?

Asked by roadieflip 8 years ago

Lasers vs LEDs in the deep ultra violet spectrum, and focusing?

I am currently trying to research this topic as I am looking into building a stereolithograph 3D printer. I have been searching for some time now with not a whole lot of answers. This is not my area of expertise so I could use some input. I have found lasers in the range of 256nm wavelength but it is going to cost me an arm and a leg. Even at the price range the UV lasers are only outputting at most 1W of power. I have read that UV curing resin is most reactive in the range of 265nm and that is why I have been searching for something in that ballpark. I have found some companies that manufacture LED in that wavelength but then the problem is going to be trying to focus the light down to a fine enough point. I am trying to design a 3D printer that is in the high resolution range. So, my true question is. Does UV curing resin react best with the 265nm vs the 400nm range as I could just a blu-ray laser. If it is better at the 265nm range, could I possibly be able to focus enough light from a couple of 3W leds down to a small enough point to cure the resin where I want it to be. The other idea is taking a UV laser in the 400nm range and focusing the beam down to get me fine but quick set up time in the resin. Or possibly multiple Lasers

Asked by ColtanA 3 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

Anyone tried a (true) UV LED based moth trap?

I have also commented on a seemingly related old dead thread but hope for better luck here. Firstly, did anyone ever make any progress with building and successfully using an LED based moth lure/trap? Secondly and if yes, any advice? I am currently in the process of building a lure/trap that will use reflected wavelengths (interchangeable LED head) based on the principle that Moths (as pollinators) and flowers (as pollinatees) see and reflect UV light respectively and if that is true then surely i can take advantage of this to build a targeted trap to trick the moths in. note i will be testing UV wavelength (365nm), violet (400nm) IR and white LEDs.

Asked by BDen 6 years ago

Beamless blue ray laser. Answered

I have this blue ray laser in an aixiz housing with the proper driver and correct voltages and amps.  When I turn it on it acts like a blue flashlight. Instead of making a beam like a laser should it makes a weak glow like an Led that’s not very powerful. I tried focusing the lens and using it with no lens. I am running it at 90.5 MA the maximum MA is 100MA. What is wrong with my diode? It is a 200mw diode the ebay seller says it can burn paper and pop balloons  It is dimmer than a dollar store laser pointer please help!

Asked by DELETED_cdousley 8 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: 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

Has anyone put battery operated mini LED spotlights in an acrylic display case?

I was  given  a Bradford Mint 1:24 scale 1966 Mustang convertible model car for my birthday. I want to display the car in a lighted acrylic 10" cube and a 3" base. I am asking the Instructables community for their help, as I have never undertaken a project like this before.To begin the car measures about 8" Lx 4" W x roughly 4" H. Now, here are my three questions. First, would an AA battery power source run a switch plus 4 LED violet spotlights? Second, what can I use to attach the LED's to the base? And is there a way to harness the LED light to only highlight a specific point on the model car ? I have never undertaken anything like this before. And although I can picture the look I'd like to achieve in my head; I'm very much in the dark about a lot of the details needed to get the job done.Any help on any one or all four of my questions would be greatly appreciated.  Thank you, Cathy

Asked by polus 1 year 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

How can I sense the movement of my two cats throughout my house, easily and cheaply? Answered

I want to be able to detect where my two cats are within my house using an Arduino and some sensors. Accuracy doesn't need to be 100%, as long as I know which room they are in or which side of a room, that will do. I thought of using RFID tags and readers, but I would need one reader per room or area and they are very expensive. XBEE triangulation is a possibility, but this also sounds expensive and not sure of teh size of the devices the cats need to carry, I then thought maybe an IR lamp on the collar and a sensor in the room, but this requires a lot of power meaning a bulky pack on the collar, which I don't want. Final idea is maybe one cat has an IR reflective patch on the collar and the other a UV reflective patch and an IR and UV sensor in each room that sends out a flash of IR and UV every 10 seconds or so. But not sure if this is safe and if it can be done. So..... I'm looking for ideas from the community. It must not cost a lot. The cats mustn't need to carry anything bulky. The devices need to be wireless. Any ideas please? Thanks, Mike

Asked by TheArduinoGuy 9 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 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

Regulated pwr supply using one pwr source to supply 3 lasers w/ diff amounts of V and adjstable mA (info in Details)?

I am working on a multicolored laser unit combining 3 different colored lasers (violet, red, and green) and i would like it so that they can all be supplied with power from one source (such as a AC-DC wall transformer). But each one runs at a different amount of mA's and Volts. I cannot figure out how to get the exact voltages and mA's that i need to run each laser from one power source. here is what the circuit needs to do: --- Use one power source to simultaneously supply 3 lasers with constant voltage and adjustable (using a POT) current. --- Be able to continue to supply constant voltage and current to the other lasers if one is turned off (i dont want the mA or volts to suddenly rise and blow one laser if i turn the other off). --- Use 3 seperate POTs be able to individually adjust the mA delivered to each laser (all of them will run at max mA and if i want to turn down the green i would up the resistance of one of the POT's to reduce the mA flow to the green laser) the 3 lasers that i will be running each have different power specs. below is the max power that i will want to run each laser at. the voltage delivered to each laser this circuit must always remain CONSTANT. the mA's delivered to each laser must be able to be LOWERED from the below specs using a potentiometer or variable resistor. 6V 120mA 4.5V 420mA 3V 340mA If anyone could figure out a circuit or design that delivered these 3 voltages and the same or similar ampages to the lasers from lets say a 12v 1amp power source (it could be more or less as long as i can buy it online), i would be eternally gratefull. i could allways change the resistor and POT values to make the mA's match what i need exactly. I have been looking for somebody to help me out with this and i can find absolutely nobody who knows how to do this. thanks for the time. -Jakob

Asked by pianoman2011 9 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 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 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