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Does anyone know of any type of ultrasonic that is waterproof and can go underwater? cause im trying to make a fog machine using the ultrasonics pieces and water since my dad bought something that worked like what i described. anyone know of any that can be underwater or some design that will work underwater using a regular ultrasonic you see on robots?

I've seen kits and plans online for ultra-sonic teenager deterrent devices but I can't imagine that they are all that complicated.  There is a large group of teenagers that hang out smoke, litter, stall traffic and make a great deal of noise across the street from my home.  I believe that having one of these devices and hiding it within range of them somewhere on my own house would be a great way to get them to disperse to somewhere else.  If anyone has made one of these devices and would like to share their design I would greatly appreciate it.

 Okay, if you guys haven't built the ultra pistol 2 before, then get building! Or, if you built the original and liked it, then you'll love this! This is my first review so, yeah, i've seen many done, so I'll be fine. We'll start with reliability: This gun is very reliable, it's easy to fix when broken, it doesn't mess up when firing, and it's pretty much impossible for the new trigger to mess up. I give it a   10/10 Strength: This one is much stronger than the ultra pistol 1. It's smaller, making it stronger, and the new barrel is shorter, so it's stronger too, the only thing wrong is the handle and trigger connection, making the handle wobble a tiny bit. I give it a     9/10 Range: This gun is very powerful, due to single shot, so it can get a good 45 feet, or 55 if you use more bands. I give it a 9/10 Rate of Fire: It's a single shot, so you don't get a good ROF. I give it a   6/10 Comfortability: The only thing that you are holding is a handle, the handle is right handed, and i imagine it is comfortable like that. (i hold guns in my left hand. I give it a   8/10 Accuracy: This gun is damn accurate, even more accurate when you have finned rods, but not everyone has time or wants to make those. I give it a   9/10 Looks: This gun looks a lot like a magnum, which is a really cool gun, but there is something missing on it.... I give it a   9/10 Trigger: Trigger is a teensy bit forward, but it doesn't mess up or anything evil. I give it a   9/10 Last but not least- ammo: This gun takes a lot of different kinds of ammo, and you can test out which ones you like and whatever. I give it a   9/10 Overall: 8.7- a very good gun by Oblivitus

We have 4 independent ultra sonic flow meters and they give us ghost readings at random times. We are sure it’s not emi from an outside source. It’s a frequency signal that our flow computer picks up without product ever running through the pipe system. It only happened at random times like 3 or 4 weeks apart. And are happening more often. Does anyone know best way to troubleshoot.

I just had a haircut 3 week ago, and noticed that my hairs have grown atleast 1 inch long now. my nails also grow very fast, is this normal, or is there something that is going wrong?

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. 

I want to step down voltage from a 1.2/1.5v battery to 0.05V. Any advice?

I'm trying to find low noise, servos or actuators, havent had much luck, anyone know of any? thnx

 I found the low volt side of the transformer but when I attach the second terminal of the 9v it sparks at the battery and not on the high volt side. Help!

Is there a way to create an ultra-simple low pass filter? Will not be using it for subwoofer, but to split audio and boost the power for audio-synced leds. Is a split at about 15-200 hz any good? or should it be higher/lower. Mostly looking for bass guitar and some drum to go in this area. I am totally non-audio knowleged, and am beginning my circuit building skills, so yes, i need lots of help. Can i hook this in parallel to speakers and will it not affect sound quality? can i use a separate audio (no op-amp) amp to boost power to leds? (such as a .5w amp to leds that consume less than .5w?) or should i find an op-amp. Could i just put the filter on and hook leds up in parallel w/out sound loss? I am getting totally lost. I know this is a LOT to ask of you, but your answers to my previous questions have been very helpful and are greatly appreciated. Thanks for putting up with me :) I wish i could figure this out better, but i am having a hard time. So far example no.1 on this link (about halfway down page) seems to look pretty good. Thanks!!!! http://www.electronics-tutorials.ws/filter/filter_2.html

The question is in the title, the computer I will be running has the following specifications; Memory; 4GB Kingston DDR3 C9 1333M Video Card; Saphhire HD 5750 700M 1GB CPU; Intel core i5 750 3.66Ghz SKT 1156 (quad core) All the other specs are sufficient, thanks in advance to anybody who can help me

I would like to add LED chaser to this schematic with time delay 400 nanosecond use ne555 and IC 4017. Thanks for the help datasheet for LED ultra bright : 3.5V, 25mA (maks), 12000 mcd?

I was browsing through one of my local supplier's LED catalogue..Literally overwhelmed by the types of LED out there.. Diffused, non-diffused, super flux, super bright, ultra bright, common anode, common cathode, flashing, bipolar, etc..Anyone care to enlight this electronics noob? Plus some of the LED spec says something like 630nm, 1800mcd, what do they mean? Thanks..

I was just wondering if someone has ever salvaged a super/ultra-capacitor from some kind of electronic device? I it possible to even salvage these from something?

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.

I have buy cyber knex on ebay but there no instructions. can someone print it and send it to me????

Hey everyone.... :) I'm organising a camp to encourage high school students to take up STEM courses..... and I'd like to have them build their own RC quadcopters. I want the course to have a minimal fee.... so the quad should be INSANELY CHEAP. The quad should be able to do just one thing:FLY. Also, durability is not an issue.... just one or two flights should be sufficient. 1)Can someone please suggest a design using brushed instead of brushless motors? (Simply because they're cheaper) 2)If there's any way I can build a flight controller using off-the-shelf components.... please share your ideas.. 3)I have no idea about how to make the remote control/ RF transmitter....... is it the same as that of an RC toy car remote control? 4)I've come across some lovely designs where the frame is made out of paper or cardboard.... so that's not an issue.  Help in any form is welcome.... I'd love to hear from y'all....  Thanks in advance...:)

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

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

It would be super cool.

This is buzzbee I think or its nerf, no matter, I need help learning how to silence this thing. Maybe make an instructable and link me to it? That'd be great.

My 500GB Seagate Freeagent GoFlex ultra-portable drive seems to have failed under two weeks of using the product. The USB device was not being recognized. It states a Code 43 error by Windows. After another attempts to see if it would work on other ports or laptop devices, it began to make a noise with 3 beeps or clicks, and would still not be recognized. About half the drive is full but wasn't heavily used. It was dropped once but it did function properly after this drop. Is physical damage most likely the problem? What should I do to recover the data? Thanks

I would like to add backlighting to my Ultraflat Logitech Keyboard but don't know how to do this properly, any help will be appreciated. Additional Details: USB powered, Author doesn't properly understand circuit diagrams.

Hello, recently i have received an audio amp. But the problem is; i can't solder it! i have thin solder, but no soldering iron tip to do the job! Please help me find a tip Thanx!!

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?

Taking down the waist a few inches how would i do that? full instructions please :}

Any instructables on making such a magnet cost effectively?I used the search function but not found making magnets like "Samarium Cobalt".They say the scientists found a very quick method (http://www.physorg.com/news136566531.html).Anybody know the method?Please......

Hello, I have been thinking about a project for a long long time, using 2 huge super capacitors with usb devices, such as an ipod. I am currently thinking of using 2 these: Link to 350 maxwell ultra capsLink to 350 maxwell ultra capsBut my real concern is safety. These capacitors can produce loads of amps at 5v, and that alarms me. Are my concerns real, if so, is there any safety precautions that one could take?

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...?

I just picked up a branson 5210 2.5 gallon ultrasonic cleaner.i will be using it to clean aluminum motorcycle carbs that have been sitting and become encrudded.i have gotten a lot of suggestions as to what sort of home brew recipes work well, i was hoping people around here could tell me what they use or have heardi will be ordering some of the carb cleaning stuff from sharperteks website to compare it to different homebrew recipes. my goal is ease and lack of cost here. thankshttp://i9.ebayimg.com/01/i/001/43/54/91b8_35.JPG

I'm looking for a very thin, non-conductive, copper wire. Although I've been told this is impossible to find and wicked hard to make, so something clear coated would also be acceptable, but I want an ultra fine gauge. I also want it to be solderable. Anybody know where I can find some?

I am thinking of buying a flip ultra hd camera but the 8GB seems small. As im going on holiday soon i wont have access to a pc. Is there any way I can transfer the video to a usb hdd or flash drive without the pc? Can anyone help?

Any one know how to make one of those sound from ultra sound gadgets? I saw an instructable for a kit once but I can't find it. thanks in advance!

Hello , Am asking for a layout for 6V ultra bright Chaser 9 LED channels Layout i saw one but its quite clear 

How can i make graphene for cheap and isolate it i try adesive tap but hoe to get graphene out of it i want to make a ultra capacitor

Hi, I'd like to know if there's a sensor easily used with an Arduino that detects the signal strength of a sound of frequency determined by me. I want this to make a sensor that can be used to measure its distance to the emitting object omni-directionally, ie, not like ultrasonic or IR distance sensors, which only sense what's in front of them. I want the sensor to sense the SPACE AROUND it, like... spherically. If you know of a sensor that does that in another way, I'd LOVE to hear about it. I've been searching for something like that for a long time... Anyway, I just need a sensor - cheap, preferably :) - that senses the signal strength of a wave of frequency x. By the way, the distance range to be measured is about 10 - 150cm... Thanks!

I need help with my solid state tesla coil. i need links to a free sample of either FQP17N40 or ntp12n50 or 2SK3068 as well as the ultra fast diode MUR1560 i appreciate your help

I need a diagram. i have parts and will pick up more if needed, please specify what voltages, ohms, needed as well if heat sinks are needed,  Parts i have. One of each of the following leds. surface mount LED is mounted on a 0.80" diameter aluminum disk which serves as a heatsink and provides solder spots to simplify connection. Cree X Lamp 7090,  1 WATT GREEN ULTRA-ULTRA BRIGHT LED 45/ 73 Lumens @ 350/ 700 mA 100 degree viewing angle Maximum forward voltage: 4 Vdc Maximum forward current: 350/ 700 mA Cree XLamp 7090,  1 WATT BLUE ULTRA-ULTRA BRIGHT LED 19/ 31 Lumens @ 350/ 700 mA 100 degree viewing angle Maximum forward voltage: 4 Vdc Maximum forward current: 350/ 700 mA Cree XLamp(TM) 7090, 1 WATT RED ULTRA-ULTRA BRIGHT LED 34/ 55 Lumens @ 350/ 700 mA 100 degree viewing angle Maximum forward voltage: 4 Vdc Maximum forward current: 350/ 700 mA I have 3  Tip31 NPN TRANSISTOR, 3A 80V TO-220 I have One 12' CABLE, 3.5 MM STEREO PLUGS BOTH ENDS i have one  Stereo plug splitter ( so i can listen to music while lights are going) I have 100' of red and 100' of black 24Ga hook up wire i also have, solder, solder gun, wire snips/strippers, access to resistors and power supplies, volt meter/ohm meter, and other tools I would like it to be a wall plug system using an adapter The leds were about $10 per so please give me real diagrams, dont waste my time or money. I will be double checking the diagram, and checking to make sure all math is correct, will i need resistors and what type, will i need heat sinks even tho the leds already have 1 built in, ?

I need to construct something for a science project but i don't know what to construct and how to construct it.

Is it possible to make a super pc like this the total cost is $ 314.05 1.)Western Digital 2TB Caviar Green Manufacturer: Western Digital UK Price (as reviewed): £262.20 (inc. VAT) US Price (as reviewed): $299.99 (ex. Tax)_2.) 48VDC 120MM COOLING FANMinebea Electric, NMB Model 4710NL-07W-B69. 48 Vdc, 0.20A DC brushless cooling fan. 120mm x 120mm x 26mm (4.7" x 4.7" x 1"). Thermoplastic venture and impeller. Three 23" leads. UL. We have a large quantity of these new 48Vdc cooling fans. They also function quietly and efficiently at 24Vdc. Very special pricing.$1.75 need 6_3.) main pc unit/keyboard/mouse/large lcd screen Free (all ready have one)_4.)BLUE ULTRA-BRIGHT LED & RED ULTRA-BRIGHT LED & ORANGE ULTRA-BRIGHT LED =4 of each =2$ us _5.) translucent plastic drawer 6$ need 1_6.)usb extender 1$ + Tax need 4/usb 4 port extender 8$.

Found this the other day. Huge ultra-high-resolution image of the night sky, with interactive doohickeys to boot. Very enjoyable.  http://media.skysurvey.org/interactive360/index.html

Could you make a coil gun, instead of shooting bolts it shoots a nail. The tip of the nail is dulled. When you fire the nail accelerates to a really fast speed, hit's an airsoft pellet, the pellet goes flying, the nail head gets stuck by a mechanism (barrier). would this be safe, or be a really really bad idea and the pellet won't get that fast. Just asking cause i've always wanted to make some sort of cool electronic gizmo shaped like a gun that does cool stuff, like a coil gun, or maybe makes stuff glow or something, I dunno, something cool ;)

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!

Would it be possible to mod a Macbook to have an ultra-bright mac logo on the back that you could use as a flashlight? Is the backlight to the screen the same light that illuminates the logo?

I'm building a thin and portable, 18"X24" lightbox that needs to have super-evenly diffused light: as if it was a flat panel lcd (which I would use had I the money, though it's heavier than I would like). What technique do you suggest I use? Will CCFL or led lights along the sides of white plexiglass work? If so does anyone have an idea how to aquire & assemble them (I've seen tutorials for laptop sized panels but not for one this large- don't know if the light will reach the central area of the panel) Or should I just use led strips along the bottom and sides of the box under the diffuser? If so how do you suggest I spread them? Thanks!

Talbotron22 is a finalist in the Laser Cutter Challenge for:DIY Kitty Crack: ultra-potent catnip extractThis is a forum post created by Instructables on behalf of the finalist. Help us judge the contest by rating this forum post! Check out all the finalists in the master list or in the Laser Cutter Finalists Group!

I need some like this: www.amazon.com/gp/product/B002QQ1YOM/ref=s9_simh_gw_p60_t3 to make 6ft strips of ultra bright white lights. And I need some transformers to power the lights.  What is the best and cheapest? Thanks!

An article in PhysicsWorld reports on a novel technique for measuring the acceleration due to gravity. The researches used a cloud of ultra-cold atoms and bounced them off a series of upward laser pulses. By measuring the timing of the bounces they could measure g with better than 1 per mil precision.