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!

Topic by Weissensteinburg   |  last reply

UV Screen Comments

Hi all, I'd appreciate some feedback on my UV screen project. As a relatively new blog I have effectively zero traffic there, so I thought I'd ask for some feedback here. The goal of the project is to provide an easy way of converting a record player to a UV screen (as pictured). The idea is to replicate the appearance "Death calls the tune" project by Lab Binaer, although I'm avoiding using an arduino in an attempt to keep costs down. The ultimate goal is an instructable, but before that stage I hope to work a bit more on the available functionality (currently it will just write text to the screen, each phrase being written alternately in one of three positions). Here are some planned but as-yet unimplemented short term goals; Investigate replacing the serial connection with V-USB New modes (Bar graph output , Seismograph style output, Spiral text) New stylus using SMD LEDs (currently uses 5mil) Offload all settings to XML file Slow rotor speed further I'd be appreciative if you could offer ideas for new functionality, uses, modifications, any thoughts or comments. Thanks, Drew

Topic by andy   |  last reply

What wavelength UV LED do I need? (and cheap source for them)

Alright less of what kind I need more than what will work. I want to buy one of those LED work lights (that go for around 40 bucks) to UV, however according to this list I would need 365 nm LEDs http://www.riskreactor.com/Black_Lights_UV_LEDs/Black_Lights_UV_LEDs_Main.htm so my question is, would it be better to go with 365 nm? Thing is those are way more expensive than 380 nm leds, but you can do some neater stuff with them. So, would it be worth spending the extra on them,  and do any of you know a place I can get them that don't charge a ridiculous amount for them? Also, would it be a good idea to perhaps mix the LEDs that way I get the stuff you can do in 380 nm and 365 nm? would that work?

Question by XOIIO   |  last reply

Ultraviolet Switch?

I am trying to figure out a way to make a switch that is activated by a UV light. I have looked all over the web and cannot find a thing on this subject. The reason that I am trying to do this is that I recently purchased a Sonic Screwdriver that  has a IV light in the end and I was wanting to make it turn on/off things with the push of a button.

Question by Ben Torok   |  last reply

A shameless plug!

Right, I've cut it fine on the deadline, so I'm giving my Invisible Costume Instructable a shameless plug here = got to get the view-count up somehow ;-)If you need any incentive to have a look, it's the costume I failed to make in time for the Hallowe'en contest. Go see what you nearly missed.Why are you still reading this? go, click, get my view-count up!

Topic by Kiteman   |  last reply

How UV resistant is wood? Answered

I'm making a USB solar charger intended to last 20 years. It will have no batteries inside, just a voltage reg and a zener diode. The solar cells will be wired together under glass, not epoxy (for better lifespan). I want the frame to be made of wood, but how long will that last in direct sunlight? This solar charger will contain no plastics, polymers, or resins...so my only choice for a frame is glass and wood. THANK YOU SO MUCH!! -Nepheron PS. I chose wood because it is very opaque, and I reasoned that it may be fairly UV resistant... But IDK.

Question by nepheron   |  last reply

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.

Topic by Ora   |  last reply

Where can I Buy a UV LED? Answered

I wanna buy a UV LED for GLOW water but I need a black light and a UV LED is the same thing. Is it legal for me to obtain one(stupid question?).

Question by Chromatica   |  last reply

non UV(A) blocking plastic / lens, any ideas

I'm building a UV(A) 365nm powerLED lamp and need to protect the leds without loosing performance. Does anybody know of a plastic to protect the led without blocking the uv, glass is to fragile (and blocks), it's for heavy use.

Question by Fonnie   |  last reply

how can i make invisible ink which is visible under UV light?

How can i make invisible ink which is visible under UV light?

Question by shehabshameer   |  last reply

Does a florescent black light carry any health risks greater than that of a regular florescent bulb? Answered

Does it generate a higher level of UV radiation than a regular florescent lamp  or just "filter out" visible light with colored glass like the incandescent black lights? Should I worry about extended exposure to the skin or eyes? Thanks.

Question by C2H6   |  last reply

CFL's putting out too much UV radiation?

Our local (I think) news service has done a story about CFL's emitting too much UV radiation, You can view it here.Would you rather sit under an incandescent light or a CFL for a extended period of time?Do you think they should have warning labels on them?Do you have any other opinions on CFL's and energy saving globes?Or do you think this is all just a way to get more people to but the old incandescent bulbs?

Topic by thermoelectric   |  last reply

What resistor(s) would I use for this LED?

What resistor(s) would I use for this (http://mouser.com/Search/ProductDetail.aspx?qs=sGAEpiMZZMtJ8nYvfCigMnhPGGOZPOa2uZUDzR6R8VM%3d) UV LED? I'll be using 3 of them in a row with a 9v power supply, would I wire it to be battery - resistor - UV LED - resistor - UV LED - resistor - UV LED - battery? Or something like battery - resistor - UV LED - UV LED - UV LED - battery?Thanks!

Question by sciguy77   |  last reply

How can I cut in half a CRT's glass case without shrapnel or mercury poisoning?

 What I want to do is remove the phosphor screen of a CRT and see what happens if I hit it with intense UV light. I know I've got to look out for high voltage, and that if I don't let pressure into the vacuum very slowly with a small hole the glass will shatter and spray shrapnel everywhere.  I'm also concerned about mercury/lead and any dangerous chemicals I'll be exposing myself to.  Can someone explain the dangers and what I can do to avoid them?

Question by kramerr 

Finding An IR/UV light Filter? Answered

In step 5 of this Instructables he places and IR/UV filter over the halogen bulb in the projector to prevent the screen from fadeing and keep the temperature down. Does anyone know where to find a filter like this? I have been looking around the internet and at a couple of hardware stores and haven't found anything. ,Dan

Question by TheCheese9921   |  last reply

12 UV LED Flashlight specs?

Using a 12 UV LED flashlight head for another use.  Flashlight runs on 3 - AAA batteries and I want to use in an application where it is driven by a 9V battery.  I don't know how to get mA info for a flashlight head to calc a resistor.  Anybody have info that would help?

Question by Super_Dave   |  last reply

UV LED strip light troubles

Hey ho,I rigged up a lighting display for some glow-in-the-dark memorabilia, using a 12V 5A power supply adapter (intended for LED strip rope lights) and some 5050 LED waterproof strips (trimmed down to 156 lights). I asked around and was told I didn't really need to add resistance so I just soldered them cleanly into the display and added an AC power switch between the plug and the power supply.Everything looked fantastic for a few weeks, but over the last few days they seem to have faded... they are much closer to a mild, neutral white than the strong UV-only brightness they originally provided (fluorescent colors popped, GITD toys glowed nicely). There are a few places on the strips that have come to illuminate with a warmer, yellowy light. Before I purchase some new ones and prepare to replace these, is this a common issue with cheap light strings, or possibly something in the power supply I should check first? Do I need to add some resistance between the power supply and the lights?Thanks! -Spunky

Question by Spunk-Monkey   |  last reply

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.

Question by DIY Emilio   |  last reply


Hey guys, im in the process of making a UV LED Light Box for PCB making, im planning on using an arduino nano. the picture is how i plan to wire everything (i used EveryCircuit btw) but i cant seem to make the circuit work in real life, any advice? thanks in advane

Topic by Rafael_RMoreira   |  last reply

Transparent Electrical Insulator Film

For a project of mine I need to apply a <1um thick film that is electrically insulating, but transparent to UVC & UVB (and preferably up to visible). Does anyone have any suggestions?

Topic by SillyInventor   |  last reply

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?

Question by The Ideanator   |  last reply

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

Question by ColtanA   |  last reply

please, can any body tell me what exactly is this and what it is used for?

Is it some kind of controller or somthing , because it's programmable

Question by neoking1991   |  last reply

just out of curiosity, do they make UV headlights or infared headlights? Answered

Furthermore if they do make either of these, are they legal?

Question by cdubnbird   |  last reply

Wind-Up Charger For a UV-C Wand

Hi I have a UV-c wand which I acquired recently and instead of running it off mains or batteries I would like to make a wind-up charger for it (similar to the wind-up torches).  It would also be good learning for me as I am a novice at electronics and it doesn't seem like too hard of a project. The mains input for the wand is 6v DC, you can also use it with 4 AA batteries. Instead of having rechargeable batteries I was thinking of having the winding mechanism to charge a capacitor.  The UV light is rated at 4 watts and it would be great if I can get 3 minutes of use from 3 minutes of charging and even better if there was some sort of notification which would let me know when the capacitor was fully charged (like an led lighting up). Another way that I was thinking was that as you were winding, the light would be working at the same time, so instead of taking 6 minutes for the job it would take 3 minutes. Help and advice will be appreciated. Thanks

Topic by jezym108   |  last reply

Does anyone know if there is a UV-type (blacklight) EL wire available? Answered

If so, where can I get it? If not, what option currently available produces the strongest "blacklight" effect on neon or UV reactive materials? (Glow in the dark type stuff)  I want to outline the brim of a cavalier hat with an EL wire that will make blacklight reactive make-up glow for Halloween. Any help is appreciated.

Question by SMBonante   |  last reply

How to UV-modify the &quot;USB fading star&quot; instructable?

I have built sooraj619's "USB fading star"  circuit (https://www.instructables.com/id/USB-fading-star/), but with UV LED's instead of red. I hadn't thought about the fact that red LED's have a quite low voltage need (about 1,8-2 volts) compared to UV LED's (3.2v – 3.8v). But it is a problem. The UV LED's (24 pcs) aren't even close to full light intensity. They do, on the other hand, pulse in the right slow way. Does anyone know in which way the circuit could be changed to make the LED's light up properly without the LED pulsing being all disturbed? The circuit input voltage should remain 9 volts though.

Question by J.W.N.R.   |  last reply

Using modern UV active pigments for indirect lighting?

I am still living from boxes after moving house but I came to a small batch of very impressive UV active powder. This new kind glows in the dark for at least a full night with good visability and usally it sold with the color name "auqa blue" - just don't be fooled by the old style pigments that only lasted for a fe minutes, I am taking about hours here.... The images and videos I tried with my SLR and phone are all terrible, seems they don't really like UV light :( My thought was something like this: Having a sufficient amount of pigment in the top coat of the wall or ceiling paint to allow for a nice glow. Either on floor or ceiling level a row of UV LED's to allow for a quick charge of the pigments, or as an alternative once technology has caught up EL panels in the UV range with a pigment coating. An area of 5x2cm is already enough as a "reading light" for several hours or to illuminate a map during night time hiking trips. Also with the long after glow it would be quite possible to use "light transmission". Here you have acrylic sheets on the outside walls or roof catching the light and transporting it to the inside. So you could use natural light during the day that would also charge the pigments on wall or ceiling. Of course this is not really feasable for home use unless you don't require any sleep but tunnels, bunkers, mines and such could benefit especially if using fibre optics to "transport" the light to where it is needed. Another great idea (at least I think it is) would be to use these pigments on footpaths and sporting grounds. Imagine a footpath that glows at night and illuminates where you go! Or imagine a big factory during a power outage at night having clear walkways to direct the workers showing up all of a sudden on the floor... Some quality pigments still allow for over 200 lumens after 60 minutes of recharge - this is in the region of a low power LED of modern technology. I don't think a topic like this will qualify for a best answer but I would love to hear your thoughts and ideas on the topic of these modern after glow pigments.....

Question by Downunder35m   |  last reply

Why some CCFL Inverter circuit will broke under no load? Answered

Why some CFL Inverter circuit will broke under no load? I buy a UV Tube with CFL Inverter. When I pull out the UV Tube the circuit were shutdown. I want to know what's wrong in this circuit if I run it on no load

Question by james34602   |  last reply

How can one make a water cleaner for a well using Titanium Dioxide and UV light? Answered

Hi, I have been looking into cleaning my well water at the source, rather than fed in into the lines. I have looked at making a simple ozone generator by purchasing one online and using a compressor to get it down 40 ft. Then I came across "silver bullet" and what intrigued me was that they produced hydrogen peroxide, which apparently is a a better bacteria killer, perhaps more stable. The reason that I want to kill bacteria and have it in the well at the source is because lots of iron bacteria and iron in my water plugging up my pump every so often is frustrating. This product looks promising, but costly, so researching this I found that they were using UV light, but normally UV light makes ozone with air. Then I dug deeper and then found out they are using a matrix made up of something similar to Titanium Dioxide (there are different forms, such as anatase and rutile which maybe more effective) so that when struck by proper UV light, it gives of an electron which will hit water vapor in air and split up water molecules to form OH- and H2O2 and some O3. So, one can buy TiO2 online, put it into a container that fits a UV lamp inside and blow compressed air through that and down the well, but the powder might get blown down the pipe. So how can one crystalize it around a cylindrical form that fits around a UV light to make it more efficient? I saw a similar post by Ian and he wants to use it for air cleaning, but gluing doesn't appeal to me as the glue itself might react with oxidants produced and give off other contaminants that I do not want in the water. So, can I use a type of glue that is safe around oxidants? Is TiO2 able to crystallize easily? ( I read that it doesn't dissolve in water well, which would rule out supersaturating water and crystallizing it that way) Any thoughts and suggestions?

Question by Hendrik0360   |  last reply

What type of light cause a solar cell to work? Answered

Is it the uv's or the infrared or the visible light or dose it use the radiant heat to work

Question by dizzydog598r   |  last reply

why are the resistors heating up?

So i have 48 UV LEDS and each has a 470 ohm resistor on the anode so in a sense all leds are connected in parallel but it has a resistor on it. when i connect my 12 volt battery with 6500 MA the resistors begin to heat up. is there anyway to prevent them from heating up? or what is it that im doing wrong. ill provide a picture on the way the leds and resistors are connected if you want me to but hopefully what i said gives you an idea on how they are connected.

Question by diabloboy   |  last reply

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

Question by TheArduinoGuy   |  last reply

robotic arm arc welder

Is it a robotic arm capable of arc welding feasible for a diyselfer ? I spotted some robot arms for cheaper than 200 $ over the web . Vantages for the operator would be no weld fumes breathing , no uv rays and such ..

Topic by gabdab   |  last reply

Inkjet $$$ Ink. Why so expensive?

Whats the cost of inkjet ink? 1000/gal?  could somethin else be used? whats so special about the stuff? and could we run lemon juice thru for invisible ink?  or a UV  ink?  or foodcoloring?

Topic by Toga_Dan   |  last reply

can any one pls tell me the limitations of laser alarmsecurity system...

 i;m thinking to make a security system using UV instead of laser.....................can any one pls tell me its proper operation and d drawbacks of laser alarm security system............

Question by engineeranshu   |  last reply

I've found a UV/Black-light flashlight thing, What should I do with it?

I was digging through some old stuff when I found this flashlight thing. The top is an actual flashlight (broken), but there is a (working) black-light running down the side. Is there anything cool I can do with it? Or build or something?

Topic by Spl1nt3rC3ll   |  last reply

What would happen if I changed the LED in my optical mouse to say, a green or UV (ultraviolet) one?

I'll make sure to get the right size,brightness,voltage and current LED, but would the optical sensor still function with a different color? and does anyone know why they use a red LED, or is it just easy/cheap for manufacturers?

Question by sjoobbani   |  last reply

Why isn't plastic used in the construction of houses? Answered

If plastic can be customize to our needs, why can't plastic be customized to be non flammable, UV resistant, non toxic and thermally insulated to be used in house and bulding constructions? Petroleum based plastics are non biodegradable and would last for hundreds of years. Any reason why we do not see more houses built with this versatile product?

Question by blkhawk   |  last reply

Stereolithography Peachy printer style 3d printer

Simply I'm an RC hobby enthusiast so i have alot of servos lying around I was wondering what would stop me from using a couple of them to control the X&Y axis for mirror alignment when using a UV laser for 3d printing or something like a write head on an old HD?

Topic by Jack Daniels   |  last reply

Retrofit bug zapper with LED's, Would the high voltage be a problem? Answered

I have a large and good working bug zapper that just had the UV florescent tubes burn out. After pricing out new tubes. which are expensive, it occurred to me to try using UV LED's in place of the tubes. Physically there would be no problem. I can use a 3 inch PVC pipe and wrap the LED string around it. Secure it to the frame and replace the ballast with power supply.  Anyway, I am wondering about the high voltage which will only be a short distance away, perhaps an inch. Would the voltage effect the LED's?  Perhaps an EMF pulse? or are they pretty well isolated and protected? I am using the ones that are coated with water proofing.  Has anyone ever tried using them in a high voltage situation? I have planned on trying this and have already ordered the LED string. I am just trying to foresee potential problems.  I also wonder why I haven't seen any with LED's on the market. Am I actually ahead of the curve on this one?

Question by Vyger   |  last reply

Wiring 4 LEDs in parallel with no resistors?

I will be wiring Four 3.3V 20mA UV LEDs for a project I am working on. This project involves using a computer's power supply to power several different components. My idea was to power the four LEDs with the orange 3.3V cable from the power supply in parallel skipping the 1ohm resistors. Does this seem like a sound idea or am I missing something here?

Question by dcaballero   |  last reply

Arduino WX code help for Weather Underground data upload?

Hello- I tried to recreate this WiFi Weather Station project using most of the same parts except for the Arduino WiFi101 shield.  I am having a problem with the data only being uploaded once.  The code tries again, but it seems the connection to WU fails after the first time.  I have to hit the reset button on the board or reload the code for it to upload again.   I am wondering if the connection to WU needs to be severed after each upload and the entire process needs to repeat after that.  I have no idea...  Someone else posted a comment in the comment section for the project with same issue and the author has never responded to the upload issue.  Any help would be great.   Here is the code: int DEBUG = 1; #include #include #include #include #include     //UV sensor #include #include #define DHTPIN 2 #define DHTTYPE DHT22 //DHT22 //Constants char ssid[] = "******";     //  your network SSID (name) char pass[] = "******";    // your network password int status = WL_IDLE_STATUS;     // the Wifi radio's status char SERVER[] = "rtupdate.wunderground.com";           // Realtime update server - RapidFire char WEBPAGE [] = "GET /weatherstation/updateweatherstation.php?"; char ID [] = "**********"; char PASSWORD [] = "*********"; DHT dht(DHTPIN, DHTTYPE); Adafruit_SI1145 uv = Adafruit_SI1145(); // UV Sensor Adafruit_BMP085 bmp; WiFiClient client; void setup(void) {   Serial.begin(9600);   Wire.begin();   dht.begin();   uv.begin();   bmp.begin();   Serial.println("Attempting to connect to WPA network...");   status = WiFi.begin(ssid, pass);    //if you're not connected, stop here:   if ( status != WL_CONNECTED) {     Serial.println("Couldn't get a wifi connection");     while(true);   }    //if you are connected, print out info about the connection:   else {     Serial.println("WiFi is a Go!!");     } } void loop(void){    //Get sensor data   float tempc = bmp.readTemperature();    float tempf =  (tempc * 9.0)/ 5.0 + 32.0;    float humidity = dht.readHumidity();   float baromin = bmp.readPressure()* 0.0002953;   float dewptf = (dewPoint(tempf, dht.readHumidity()));    float UVindex = uv.readUV();         UVindex /= 100.0;                               if (DEBUG) {     Serial.println("+++++++++++++++++++++++++");   Serial.print("temp= ");   Serial.print(tempf);   Serial.println(" *F");   Serial.print("baro= ");   Serial.print(baromin);   Serial.println(" inHg");   Serial.print("dew point= ");   Serial.println(dewptf);   Serial.print("humidity= ");   Serial.println(humidity);   Serial.print("UV: ");    Serial.println(UVindex);   }//End debug loop //Send data to Weather Underground if (client.connect(SERVER, 80)) {     if (DEBUG) {          Serial.println("Sending DATA ");       }     // Ship it!     client.print(WEBPAGE);     client.print("ID=");     client.print(ID);     client.print("&PASSWORD;=");     client.print(PASSWORD);     client.print("&dateutc;=");     client.print("now");     client.print("&tempf;=");     client.print(tempf);     client.print("&baromin;=");     client.print(baromin);     client.print("&dewptf;=");     client.print(dewptf);     client.print("&humidity;=");     client.print(humidity);     client.print("&uv;=");     client.print(UVindex);     client.print("&softwaretype;=Arduino%20UNO%20version1&action;=updateraw&realtime;=1&rtfreq;=2.5");//Rapid Fire     client.println();         if (DEBUG) {         Serial.println("Upload complete");       }          }//End send loop     else {       if (DEBUG) { Serial.println(F("Connection failed")); }       return;       }         delay(2500);     }//End loop /****************************************************************   Function Fun Time ****************************************************************/ double dewPoint(double tempf, double humidity) {   double A0= 373.15/(273.15 + tempf);   double SUM = -7.90298 * (A0-1);   SUM += 5.02808 * log10(A0);   SUM += -1.3816e-7 * (pow(10, (11.344*(1-1/A0)))-1) ;   SUM += 8.1328e-3 * (pow(10,(-3.49149*(A0-1)))-1) ;   SUM += log10(1013.246);   double VP = pow(10, SUM-3) * humidity;   double T = log(VP/0.61078);     return (241.88 * T) / (17.558-T); }

Question by rwcwx   |  last reply

Adruino cyclone dust sensor

I am looking for suggestions for building a wood chip / dust level detector for the collection can of a cyclone vacuum. I have tried using uv detectors, they get covered in fine dust and become in-effective.  I am thinking of using the ultrasonic sensor. My objective is to detect the level of chips and dust collected in the debris can, and sounding an alarm when the can gets to the full point. Any help on this subject would be appreciated.  I am new to working with these Adruino controllers and not real familiar with writing the Sketches for this. Thanks Don

Topic by Don D   |  last reply

im making a circuit useing 30 or less LED lights and I only have 4 9V batteries. I was wondering if 36V will be enough? Answered

Im making a portable circuit useing 30 or less LED lights and I only have 4 9V batteries. I was wondering if 36V will be enough and if not how could I amplify the power. I thought about a quad-opp-amp IC but Im not sure how to use it. Im using blue,red,yellow.green,UV,white,and maybe pink

Question by fastcar123   |  last reply

How can i transfer only schematics (layout) on PCB? Answered

Hi everyone and sorry for my english. I have a inkjet and a deskjet printer. I dont want to spent anymore on printers... I want to transfer only schematics (layout) on pcb, because i have a pcb marker to make the trail, or how it`s call. the UV method i dont know if i can do it, because in every tutorial they say about toner printer and special plastic sheet (i think). if anyone have an idea about how to. please help !!

Question by danyelo   |  last reply

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?

Question by ALogan97   |  last reply

Is this correct? 280 LEDs at 24mA each will consume 6.72 amps total? Answered

 I am trying to power 280 LEDs with a 12 volt power supply. The specs are as follows: Green - 3.2-3.4v 24mA max (x100) Blue - 3.0-3.4v 24mA max (x100) Yellow - 1.8-2.2v 24mA max (x20) Orange - 1.8-2.2v 24mA max (x20) Red - 1.8-2.2v 24mA max (x20) Purple/UV - 3.0-3.4v 24mA max (x20) Are my calculations correct in that this will consume 6.72 amps? What would be the best solution for powering this many LEDs? I would like to keep the setup as simple and efficient as possible.

Question by matthewsheffield   |  last reply