Audio Detector

Is there some type of electrical component which detects high frequency sounds like those mosquito ring tones? I've looked around and seen things which apparently detect high frequency radio waves, but that isn't really what I want (at least I don't think it is). Thanks in advance.

Posted by brickzima 10 years ago


SMPS formulas?

Are there any switched mode power supply formulas? I've been googling but I can't find anything... I need to know relation between duty cycle (I'm using square waves) frequency size (value) of the inductor output voltage output amperage how many amps should the inductor be rated for (is it how much your drawing?)

Posted by guyfrom7up 10 years ago


Application to collect data on behalf of the receipt, and holding a mobile phone

Collect data on behalf of the receipt, and waving the mobile phone, Application can be verified by the PC that enables you to choose a cloud in the pdf and save it I felt so useful if there is such an application, Do not make someone together? I do not have a Mac, but can not be produced, If design is good. Hi :*)

Posted by hnakai 6 years ago


Mythbusters to tackle moon landing

Did we really land on the moon? The Mythbusters have run some tests to find out for a future show. Sounds like it'll be awesome and I'll need to find a friend's place to watch it.So can a flag wave in a vacuum? Catch when the show airs to find out. linkvia Neatorama

Posted by fungus amungus 10 years ago


Physics concepts flash animations

I stumbled on this site with all kinds of cool physics animations a few minutes ago. It has all sorts of animations illustrating physics concepts, from wave behavior to vectors to fluid mechanics to magnetism. It looks pretty cool. Some of the animations are more like just articles, and some are true animations. Requires flash to run.

Posted by Lithium Rain 10 years ago


Why to use RF directional couplers in some measurements and control processes ?

I am an electronic engineer in the field of RF directional couplers, but I am puzzled about this question, why to use RF directional couplers in some measurements and control processes ? Today I come to this forum to turn to you to discuss my understandings are appropriate. Here are my personal understandings: RF radio frequency is referred to as RF current, it is a high frequency AC change electromagnetic wave short. Less than 1000 times per second changes in alternating current called low frequency current, more than 10000 times called high frequency current, and radio frequency is such a high frequency current. RF technology in the field of wireless communications with a wide range of irreplaceable role. In the electronics theory, the current flows through the conductor, the conductor will form a magnetic field around; alternating current through the conductor, the conductor will form an alternating electromagnetic field, known as electromagnetic waves. When the electromagnetic wave frequency is lower than 100khz, the electromagnetic wave will be absorbed by the surface, can not form an effective transmission, but the electromagnetic wave frequency is higher than 100khz, the electromagnetic wave can be spread in the air, and the outer edge of the ionospheric reflection, the formation of long-distance transmission capacity (Analog or digital) with high-frequency current modulation (amplitude modulation or FM), the formation of radio frequency signals, through the antenna to launch into the air, the radio frequency of the high-frequency electromagnetic waves.  Long-range radio frequency signal received after the anti-modulation, reduced to the electrical information source, this process is called wireless transmission. Wireless transmission developed for nearly two hundred years, forming a large number of users and product groups, but because of climate change and the impact of surface obstacles, can not transmit the perfect information. Modern human invention of the cheap high-frequency transmission cable (radio frequency line), in order to pursue the perfect quality of information transmission, taking into account the original wireless devices, wireless cable transmission began to pop. Resulting in the concept of radio frequency transmission. If your information source through the secondary modulation, with the cable to the opposite end, the opposite side with anti-modulation of the information source after the re-application, no matter how low frequency, but also radio frequency transmission, if there is no modulation anti-modulation process, The information source is transmitted directly to the opposite end of the cable, no matter how high the frequency, are the general cable transmission. SI --- Signal Integrity Signal Integrity PI --- Power Integrity Power Integrity emc --- electromagnetic compatibility Electromagnetic Compatibility rf - radio frequency RF emc = emi + ems EMI = Conduction + Radiation Emission SI: The Fourier transform shows that the higher the signal rises, the higher the amplitude of the higher harmonics. The MAXWELL equations see that these alternating harmonics produce alternating current at the adjacent line. And even through the space parasitic capacitance directly to another conductor, so these high harmonics is caused by radiation interference (emission) of the main factors; (that the simple point is that the signal rise faster, the more complete the signal, the better the signal quality, But for emi bad) . PI: PCB exists on the number \ \ analog area, high frequency \ 'low frequency region and other different areas and planes, if the partition is not easy to interfere with each other, that is, conduction conduction (conduction). Ps: Excuse me if I was wrong in words or expressions as I am a green hand in the field of RF directional couplers. I need continual learnings. What is your idea ? Do you agree with my ideas ? Any of your ideas would be highly appreciated. May someone would like to help ? thanks in advance.

Posted by maryzhu 1 year ago


What are all the flaming-hoops?

Say if I was to sell electronic objects invented by me or friends, that may or may to be functional or may or may not be artistic what are the laws/certification/inspections/flaming-hoops that I would have to clear first and what is that entire process like? Does anyone know? The FCC is one of them, and it pertains to whether your object will make planes fall out of the sky or turn off pacemakers dues to magnetic waves or unauthorized frequencies, correct? Who ensures that the objects won't catch on fire or melt into a caustic China Crisis goo? How you convince them of this? Who else do you want or need a rubber stamp from before you can sell your radio wave emitting blinky bug at the garage sale? Or your robo-fridge ("Is your fridge running? Better go catch it!") in your Etsy shop? What if it had a sim card? Any illumination on this would be invaluable!

Posted by watchingmachine 11 years ago


Charging camera flash capacitors from mains supply

Hi everyone, I have a quick question about charging some capacitors.  I'm trying to make a very simple ignition system using capacitors from disposable camera flash circuits.  I'm planning on using maybe 5 or so.  They are rated at 330V and 120uF.  If I were to hook them up in parallel, so that i have a total of ~600uF, could I use a full-wave bridge recifier diode to turn the AC into DC and simply charge it like that without anything else in the circuit.  I don't know how to explain this very well so I attatched a schematic so you can see what I'm talking about.  Any help is much appreciated.. P.S. Ignore the fact that the full-wave rectifier looks messed up, Circuitlab.com doesn't have a f-w r symbol.  Thanks again!

Posted by BCSTechie 5 years ago


Open Source Air Guitar Hero on Xbox Kinect

Now that the Kinect has been Kracked, people are starting to experiment. How's this for a prototype? Chris O'Shea has hacked together a virtual version of a Guitar Hero style game - stand in front, wave your arms, and play chords. Nice. Air Guitar prototype with Kinect from Chris O'Shea on Vimeo.

Posted by Kiteman 8 years ago


Request: DIY Portable Microwave

I was looking around and was hoping to find somewhere a guide to make a portable microwave, I have looked around on the internet for hours trying to find a DIY one because I want to make it myself rather than buying one.  What I am trying to do is find a way to make a microwave portable.  I wouldn't be making the actual microwave though, I would just buy one that you guys would hopefully suggest for me to buy.  The purpose of this is to have a microwave that I can put inside of a locker for cooking food in.  I just need someone to guide me through because all I learned through my searching was that I possibly needed an inverter, due to it being battery powered (I assume.)  Then again aren't there car batteries that can run on AC like a microwave, although I am not sure which is why I am here.  Summary: What I am asking is someone to make a step by step tutorial or guide of some sort to making a microwave portable (not building the actual microwave though, just making one portable to be runnable by like a car battery)

Posted by karatetoes 5 years ago


Sound wave heart beat detection

I love to graph things. Everything from outside temperature to server room temperature to the number of users on the network to my weight.I just read an article in Make magazine about DIY ECGs, and it got me thinking.. i want to graph more things about my body :)Would a microphone embedded in the bed be able to pick up the heart beats and calculate the BPM? This way I could graph development in resting heart rate over time. The microphone would pick up lots of noise from the person moving around etc.. but that doesn't mather. It only needs to get a few clean heart beats in order to calculate the bpm, right?What hardware and software would be suitable to create something like this?Any ideas?Yeah, of course there are other more traditional ways of measuring heart beat.. but I'm to lazy to do that.. I'd rather spend some time making a fully automagickal system.

Posted by chr 11 years ago


sound over smell

Could a certain sound frequency cancel out smell? as in the sound waves dissolve the smell molecule? i need to do a lot more research on this... but if it actually heads in the direction of a product where a non-hearable sound kills all the smells i copyright the idea as of now if you steal my idea and make money i will kidnap you and shred all the money you make until it is liquid and inject it into your bloodstream.

Posted by ledzep567 10 years ago


Quick! Stop surfing, it's gone main-stream.

I don't surf (that's the North Sea out there!), but I can see the attraction. Unfortunately, so can the DINKYs - surfing is turning as cutting edge and "street" as golf.Apparently the latest wave of people into surfing are so rich that estate agents have found a significant niche market - people buying property to store their surfboards!

Posted by Kiteman 11 years ago


Microwave Transformer To EMP

Hello, my question is simple. If I connect about 3v to a microwave transformer and then to a coil, would it make a efficient EMP wave (shutoff a calculator). I know that I can use a disposable camera, I just am learning different ways to do it. (Sorry for the pic, done with my phone haha)

Posted by Skydazz 2 years ago


What is a wavefunction?

In the Physics topic on the EPR paradox, NachoMahma asked about wavefunctions and "collapse."Let's put aside the whole "collapse" issue -- not all physicists agree that it is a sensible concept. NM's comment has a link to the Measurement Problem, and I'm not a good enough theorist or philsopher to contribute to that argument.What is the wavefunction? "Is wavefunction only a convenient way to say it's located somewhere close to here, but we're not sure exactly where until we measure it?""At any particular point in time/space the object is in a definite spot with a definite set of properties, but we can only make a reasonable guess?"No. The wavefunction, spread out over all of space (I'm speaking non-relativistically here, but the formal interpretation applies to spacetime), is the fundamental "thing" in QM. "Objects" are wavefunctions. If the wavefunction is localized (non-zero for a small contiguous set of coordinates, zero everywhere else) then treating it like a particle makes sense. Otherwise, it doesn't; the thing behaves like a wave, showing diffraction, interference, and lots of other effects. My preference, when I talk about these things, is to just call them "quanta." They are not particles, they are not waves; they are their own kind of entity with well defined, if really hard to understand, behaviour.How do I get to that point? Well, quantum mechanics is one example of a "field theory" (electromagnetism is the most familiar classical field theory). The equations we write down (the Schrödinger equation non-relativisitically, the relativistic Dirac and Klein-Gordon equations) to describe how quanta behave are coupled partial differential equations (PDEs), which relate the values (and derivatives) of the field at every point in space to their evolution in time.A PDE which relates the time and spatial properties of a function is either a wave equation (if the solutions are sines and cosines) or a diffusion equation (if the solutions are exponentials). The Schrödinger equation is a wave equation, and we call the solutions wavefunctions. Electromagnetism also has a wave equation, which is how we get radio, light, etc.The difference is that the functions in EM are "real valued:" the value of the field at each point in space/time is a regular floating-point number (the "phase" in EM is determined by the relative values of the field and nearby points). The wavefunction is a '''complex valued''' field -- at each point in space/time, the field has both an amplitude and a phase (or equivalently a real and an imaginary component). This means that wavefunctions can interfere in ways more complex than simply "adding" or "subtracting", which can have quite interesting consequences.You get probabilities by taking the square (norm) of the wavefunction. This procedure gives you a real value, a probability, at each coordinate. When you make a measurement, those probabilities determine which coordinate value you see as the "location" of the quantum. The actual result is random, but that isn't because "we're not sure exactly." The quantum objective does not have a single coordinate location until we make the measurement.How that happens, whether by "collapse," "decoherence," "many worlds splitting" or something else, is a subject of intense philosophical and experimental argument.

Posted by kelseymh 10 years ago


A Transatlantic Tunnel, Hurrah!

Deep beneath the Atlantic Ocean, forgotten for the best part of a century, lies a tunnel linking London and New York.It was built on the whim of a Victorian inventor with the aim of linking two great cities and developing the kind of friendship that still exists today.But bad fortune befell the venture - and the tunnel lay idle ever after.Until today, that is.One end of the "tunnel" emerges next to Tower Bridge on the banks of the Thames in London - the other is next to Brooklyn Bridge on the banks of New York's East River.It looks like something HG Wells might have imagined.Each end has a giant telescope-like construction which appears to punch its way out of the earth.There are dials, and levers, and thermometer gauges on the side of the 20m long brass and wood construction.Peer into it and you can see people on the other side of the Atlantic.Wave at them, they wave back at you.Web-cam it ain't, but the Telectroscope is fascinating. I hope it's stays operational for quite some time.Telectroscope websiteDaily Mail articleBBC StoryBBC Video

Posted by Kiteman 10 years ago


2 Minute Meals -- Your favorite breakfast?

2 Minute meals are fun, but in the morning, if you wake up too late, they can become necessity. I've made "oatmeal" in the past, just a little water and some instant oatmeal, in the 'wave for 30 seconds, and its warm. I call it "oatmeal" because its just instant oatmeal suspended in lukewarm water, it doesn't get gelatinous or anything :P What do you do in a hurry?

Posted by zachninme 11 years ago


Mobile Phones and Elevators

Ahem. Theoretically, an elevator is a perfect faraday cage -- no radio waves should be able to get into them. Mobile phones shouldn't work in them. But rogers says that their phones do work in them. So here's my question for you, instructables community: do rogers phones work in elevators? If so, why?The only theory that we could come up with was that each elevator has a little repeater in it, but that seems a bit costly.

Posted by threecheersfornick 10 years ago


Chasing Robots

Hey guys i need help with something. i have two obstacle avoiding robots. but i want them to chase and evade each other. like predator prey situations. so i have been trying to connect them with radio signals. does anyone have any ideas how i can do that? if not radio waves il listen to any ideas in IR instead. ur help would be appreciated. (yes i know im not using proper english lol)

Posted by faroos7 6 years ago


The Future of Invisibility

It is reported that a team of researches at the University of California, Berkeley claim to be on the doorstep of invisibility. Using a special type of metamaterial they are bending electromagnetic waves and negatively refracting visible light. Their ultimate goal is to render entire objects invisible to the naked eye. After reading this, I conducted some invisibility experiments of my own. Based on my initial experiments with invisibility cloaking, I must concede that we are not quite there yet, but are getting close (see image).For more information, read the full news report

Posted by randofo 10 years ago


Water dancing in a Speaker

At 6 volts,* the speaker cone filled with water produces standing waves. at 10 v,  maxing out the speaker, water droplets splash up.  i coated the paper cone of 1 speaker with liquid electrical tape to waterproof it.   an identical speaker went unmodified.  water doesnt seem to harm the paper cone. both speakers work with water. when directed down into a bucket of water,  sound stirs the water. * chopped dc voltage from an ordinary ac to dc transformer

Posted by Toga_Dan 4 years ago


39% and climbing - renewable resources in Portugal.

In the UK, less than 5% of our electricity comes from "green", renewable resources.In Portugal, they generate 39% of their power with renewables, and that is set to climb.These red "snakes" - the Pelamis wave-power system - are built in the UK (but guess which government hasn't invested in them?), and Portugal is also investing heavily in wind, solar and hydro-electricity.Link to photo storyIf one of the poorest countries in Europe can manage this, why can't the rest of us?

Posted by Kiteman 10 years ago


diy 110v AC screw-in LED lightbulb?

I'm sort of an electronics newbie, but I'm wondering if anyone knows of any designs to make a 110v AC LED screw-in bulb? It seems all you would need is a full wave bridge rectifier, a resistor(?) to lower the voltage, some LEDs, and some variation on a screw-in base to make a home-made LED bulb. Am I wrong, or shouldn't that be relatively simple to build? Any thoughts? Thanks, Matt

Posted by matthew6 11 years ago


Measuring audio

I have a project where I need to be able to measure 3 or 4 microphones and decide which one is getting in the loudest input volume. In other words to know who is talking around a four persons table. Does anyone have any idea how to solve this problem? I'm using arduino (http://www.arduino.cc/) for the rest of the project so I'm able to use the arduino to measure dc voltage but how do I transfer the sound wave into a measurable dc voltage? thx in advance / david

Posted by ZrvZ 12 years ago


How to build a jammer

Hi All, I'm a new member living in the UK and don't know anything about eletronics.I am looking for some help on how to block my neighbours radio signal-He is a radio ham  and everytime he is transmitting i get the whole conversation through my  radio, hifi and stand alone TV's and anything that has a speaker attached to it-sometimes get lines through my TV. Hope you can help Best regards Tony Mac

Posted by Tony mac 7 years ago


Ratings, so you know...

I spent a bit of time today looking again at the Instructables rating system, here's what I found:A single rating lands an Instructable around the 3 mark, there is a huge spike just on the upper side of 3.0. Mean average rating (rather close to Pi) is 3.14Most ratings seem to be positive, the overall distribution has 68.7% of rated Instructables "above average" (60.5% of all Instructables if you include unrated submissions)There is a "wave" of ratings heading up towards 4, and a smaller ripple going down towards 2. I see this as some kind of fluid-motion effect like waves on water, but I'd be interested in opinions.50% of rated Instructables sit between 2.9 & 3.4Instructables rated above 3.4 are in the top 25%Instructables rated below 2.9 are in the lower 25%Note: Rating is essentially a measure of popularity, it is not a linear indicator of quality / value.Other:Only 31 Instructables are rated above 4.5 (0.1%)Only 19 Instructables are rated below 1.5, 1 of which is the lowest at 0.99Only 12% of Instructables are unratedThe rating algorithm is in Rachel's FAQ if you're interested (I probably should have put this in earlier)

Posted by lemonie 9 years ago


High Voltage Flyback Transformer Pinout HELP!

I pulled out a flyback HV transformer from a CRT television set (I DO know of the dangers involved, and I'm VERY careful to discharge all caps and to short out the flyback).  But the problems is, I have a FB Samsung C31113D.  Very hard to find schematics or specs on.  Rather than fiddling with which pins do what (via battery and multimeter-which I guess I could do), does anyone know of a site that offers pintout schematics for different manufacturers?  I'm anxious to begin my project on building a Jacob's Ladder.  But without knowing which pins do what, I refuse to tinker.  My life is just too important. Is there anyone who may be able to help me out here?  Perhaps checking each pin with a battery is the only way to go, but I would like to avoid that if possible.  Also, what waveform does the FB  Transformer put out?  I've heard square wave, and I've heard D.C.  The only thing I have definitely heard is that sine waves tend to result in smoke from the FB. Thank you!

Posted by huck alexander 6 years ago


CNGRATULATIONS Australia

An Aussie has discovered a sonic non invasive cure for Alzheimer's Disease. It is a physical solution that sonic waves dislodge brain plaque and cause T-cell to remove the material in 85% of subject lab animals !! Another Aussie who distinguished himself by proving stomach ulcers can be cured with a special course of antibiotic.  When no one would believe him, he infected himself with a incurable ulcer case and then later cured himself to prove the assertion. A good people, if you know some.

Posted by iceng 2 years ago


Machine that can shape water

The National Maritime Research Institute of Japan has a machine that can create shapes in the water such as hearts and stars. That's just the small one. The larger machine can make much bigger collisions between waves. There's some research around safety here to merit such a large setup, but I'm just happy with the splashes and the over-the-top reactions of the reporters. Always fun to see them shout "sugoi!" and "waaaaaaa!" over and over. via Neatorama research institute Uploaded by hatoyamafandom. - More video blogs and vloggers.

Posted by fungus amungus 8 years ago


Is such water cooling gonna be good enough ?

I would like to make water cooling for laptop. But not sure if it will cool good enough, tell me what you think. I'm thinking to use copper tube, plastic tubes, some reservoir. In reservoir should be wave maker for aquarium (like this one: http://www.amazon.com/gp/product/B009YEEW2K/ref=pd_lpo_sbs_dp_ss_2/175-5374395-0420233?pf_rd_m=ATVPDKIKX0DER&pf;_rd_s=lpo-top-stripe-1&pf;_rd_r=03QDBA7BQG1ZPRCY7GAP&pf;_rd_t=201&pf;_rd_p=1944687582&pf;_rd_i=B013Q5RTFO) for quiet (without noise) water circulation through a tube.

Posted by RoS9 2 years ago


LED Gloves

I was in a bar tonight and there were these guys with these weird LED gloves and were doing this little show where they wave their hands arounds and it looked really awesome. Seems pretty simple. They have 16 watch size batteries linked up to super bright LEDs. I kinda thought that was a good project to try instead of buying a pair for 100 dollars that are considered quality.  I really don't even know how to go about this.  They're called Light Show Rave Gloves. Here's a video of what they look like afterwords. http://www.youtube.com/watch?v=gwNCnMNs6ww&feature;=player_embedded

Posted by bofthe951 8 years ago


Waveform Generator

Hi guys! So actually i wanted to make a circuit that can turn on and off an LED array at a particular rate (say 10 seconds time period). I want the LEDs to gradually brighten and dim. At first i thought i can implement it using a multi vibrator, but it it turning off and on too fast, since the output of the MV is a square wave. I want to design a simple circuit that can generate more slowly rising waveform (like sine or triangular) and can also drive a load of at least 100 mA and have a time period of 10 seconds or so. Any suggestions? 

Posted by charmquark 5 years ago


Radio Frequency Proximity Detector

Hello, Does anyone have an instructable for building a proximity detector based on a radio transmitter and receiver? Or some other wave based method? I've viewed the IR proximity detector here on this site, but I need a transmitter/receiver based one. Yes, this is for my pet. I have 2 cats and 1 dog. I need to keep the dog out of the same areas that the cats are allowed to go into, thus the proximity detector needs to be specifically tuned to the dog. Distance does not have to be far, anywhere from several inches to a couple feet. Appreciate any comments or instructables! Thanks, Eric

Posted by riccarr 11 years ago


I lost my glasses in the ocean; help me choose a new pair!

I lost my glasses kitesurfing in some enormous waves at Waddell Creek yesterday! I went through the complete spin-cycle: caught in a wave, spun so fast underwater I didn't know which way was up, almost run out of breath, lose glasses, etc... I forgot to write my email address on them, so if you find a pair of glasses somewhere along the Northern California coast let me know! I've worn my glasses in the ocean for more than 6 years without incident; in fact, I lost so many pairs of contacts to the ocean, that I started favoring my glasses. Below you can see me just coming back to shore wearing my glasses -- on this particular day, I was so tired after 6 hours of kitesurfing that I couldn't get the food into my mouth properly. I choose that pair by wandering into an optical store and demanding "1960's NASA engineer glasses." They were probably more "graphic designer" glasses, but cool nonetheless. Help me choose what I should get next! I'm partial to http://www.optical4less.com/ because they're super cheap and believe me when I tell them "my prescription really hasn't changed and I don't need another eye exam."

Posted by ewilhelm 11 years ago


HEAT: A Fire Cabaret

If you haven't heard yet, The Crucible's annual summer homage to fire is moving indoors this year, transforming their industrial arts studios into a searing jazz-age underground speakeasy where fantasy and fire converge with sultry music and machinery.  Some of the best talent in the Bay Area will perform amidst artisans plying their fiery trades, and guests will be invited to explore an industrial speakeasy alight with furnaces, forges and flames.  Time to get started on getting all dolled up for the 1920's -- think flapper dresses, finger waves, tommy guns and bootlegged fire.  More info and tix at: www.thecrucible.org

Posted by plasmajan 8 years ago


Giant Knit Animals Storm CHA

Our friends at Lion Brand Yarns recently suffered a collective wave of gigantism when they set about designing this Winter's offering for the Craft and Hobby Association.  What may have started as a collection of delicately detailed stuffed animals has grown to monstrous proportions.  (Monstrously adorable that is!) Scroll through their flickr stream so you can get a fair idea of the full scale of these creatures.  And if that's not enough, come see them in person at this year's Maker Faire! While you're checking out these amazing creations, get your inspiration on for our upcoming Critters Contest with Lion Brand.   Ladies and gentlemen, start your needles!

Posted by scoochmaroo 8 years ago


How to Identify or Measure Inductance?

I am gathering the parts for an ible, but I am short one part: a 12mH inductor.I can spot some inductors in electronic garbage - the wire coiled around a ferrite loop - but there are also solid state inductors. Plus, the inductors are not usually labelled with their values.How can I measure the inductance of an inductor with a volt-meter and an ammeter, but without access to a sine-wave generator?Is there some simple trick that would get me "close enough" to the true value? What would be really useful (but probably doesn't exist) is a chart or formula where you plug in the size of the core and the number of turns around it and out pops the inductance value. ?

Posted by Kiteman 10 years ago


Effectiveness of sugar as a piezoelectric material

Most of the sites discussing piezoelectricity mention that sugar crystals can be used, but I have not found any examples of them being used. I've just tried it with about a 1cm chunk of low quality (conglomerate of small ~3mm crystals) crystal, and got a good 100mV wave when tapped with a pencil. I've not tried applying a signal to it yet, and some better single crystals are growing at the moment, so I was wondering how well it works compared to commercial piezoelectric compounds. I've not done anything like this before, so if anyone knows where I can find information of the best way to mount and apply a signal to the crystal, it would be appreciated. Thanks in advance.

Posted by The Skinnerz 7 years ago


CAR WAVE-CONGESTION AVOIDED BY WATCHING YOUR "SIX"

Historians traditionally tell us that to ignore history is to repeat its pitfalls. So how can history help us improve the flow of car traffic? Did you know that many aspects of the world’s legal systems come from biblical origins using tried and true fundamental laws originating from the Ten Commandments? The concept of “watching your six” borrows from these universally accepted laws, whose credo stipulates guidelines for human interaction as well as interaction with god. Your "six" refers to the driver behind you whom you should treat as you would yourself. With this in mind, we have a new credo for today’s need to interact with each other by driving your car responsibly through high density traffic to avoid “wave congestion". This term is used to describe isolated packs of cars suddenly causing a local slow-down in traffic flow, while both upstream and downstream traffic continues to still move well, and so our rule states:   “Drivers are responsible for the immediate driver behind them, keeping him safe and avoiding unnecessary braking”    How This Rule Works In traffic: 1)            The Rule is Expansive, All Inclusive and Saves Us Money If we followed this general rule, we would become responsible for leaving the proper space/time ahead of the car in front of us. Space clearly gives us reasonable reaction time to perhaps "brake by simply coasting" and not force the driver behind us to suddenly brake hard. It will help us to recognize that the proper spacing between cars is not an open invitation to dart between lanes just to get ahead by one car length. This causes “wave congestion” and the possibility of accidents during heavy traffic situations. It assures that braking is something one does as a "last resort" and only when no other circumstance for safety and/or avoiding a collision is available. It holds the “rubber-necker” responsible for maintaining good traffic flow or get ticketed. The rule encourages a driver to adapt the techniques of defensive driving so as to avoid accidents, and to embrace the proper social skills of driver etiquette to mitigate road rage and its associated erratic driving behavior. Ultimately, the rule will financially help us to reduce our car insurance costs by promoting fewer negligence accidents. 2)            Eliminate Reactive Braking … Trust the Driver In Front of You Keep in mind what normally happens in heavy traffic when the first driver uses their brakes either in idle thoughtlessness or in protective response to traffic congestion ahead. Under these circumstances, we reactively use our brakes for two reasons:  a)   Reduced Reaction Time  - The first car’s brake lights go on, giving us less time to react so we over compensate by braking harder than him. This affect gets compounded, causing each subsequent upstream driver to brake still harder, until the reactive braking time becomes impossible to respond to and a collision or multiple collisions occur.  b)   We Don’t Trust Other Drivers  -  We are conditioned not to trust our fellow drivers because they haven’t yet been educated to abide by our Rule. This lack of trust causes us to drive "overly" cautious and results in the over use of our brakes to defend ourselves. Our driving habits have created a psychological situation just waiting for an accident. 3)            Implies Driving Etiquette that Must Become Required Driver’s Education The rule and its derivatives must be taught as part of our driver’s education program, and their concepts definitely reviewed during the licensing exam. The Rule also includes adherence to a driver’s code of etiquette which goes beyond just obeying our basic traffic laws of vehicle safety as is currently done. Highways are becoming too congested to allow rouge drivers to ignore their “social” driving responsibilities and the etiquette of the road.  Traffic tickets for abusing social driving etiquette should be as prolific and costly as our traffic laws for speeding and/or not stopping at a stop sign, etc. 4)            Compliments Our Near Term Use of Self-Controlled Vehicles Our Rule intrinsically implies the responsibility for social driving etiquette and takes us forward with steps that avoid future traffic congestion.  Improvements will come from technological automation which will eventually take the erratic human factor out of our equation to produce the smooth flow of traffic even during congested periods. Something as simple as today’s cruise control helps us to avoid “wave congestion” by maintaining a constant highway speed plus reducing inadvertent “brake riding” which sends the wrong message to the driver behind us.  Our ultimate step towards smooth traffic flow involves using near-term technology that completely eliminates drivers and relies on self-controlled vehicles taking over within regions of high density traffic. Ideally this will eliminate traffic accidents due to the unpredictability of driver shortcomings, making technological glitches our only possible area of concern in the near future. Google, in cooperation with the state of California, is currently in the process of introducing such vehicles onto the state’s roadways.

Posted by RT-101 6 years ago


Hydrofoil Surfing - A New Adrenalin Sport

Listening to Silvio Rivier, the host of Global Village, there was a section on Hydrofoil Surfing. I turned to the television, interested by this large word, to see this guy surfing a foot above the water! It seems that instead of floating along the water like a normal surfboard this board actually would be below the water while you stand on it. A jet ski pulls the surfer up to speed, bringing him up to the top of the water, but that's not it, there's a fin that leads down a foot and a half or so below the board, and attached to the end of that is a special shaped piece of metal called a hydrofoil that collects the water as it comes up from the bottom of the sea and goes over as a wave. The surfer then keeps going upwards, until the "foil" is about 4 inches under the water. Therefore the surfer can balance above the water, with very little resistance & going very fast. It's technically possible that this could be used for surfing not just close to land, but hundreds of miles out, so the person can surf for as long as their legs hold out, because they can surf in rougher water. Does any body think they could build one of these? Balancing on one is supposed to be like using a uni-cycle, & I'm having trouble surfing normally so even if I did build this I probably couldn't ride it. This goes out to Laird Hamilton, the creator of this funky board, & I'm looking forward to an Instructable. Cheers everybody, ~K P.S. The links aren't working so I'll add them as soon as possible. Neither is the video button, sorry about that, I'll have to add a picture instead.

Posted by Kryptonite 9 years ago


Arduino Outdoor Security System - PIR Motion Sensor, Security Lights, Intruder Warning/Alarm & Blynk Notification

I would like to ask your suggestions on how to build an outdoor ESP2866 security and sensors combo. I have seen separate postings on PIR and lights around the site and in other websites so I thought it would be doable. I knew Arduino then but only paid close attention when I realized that my x-10s are outmoded but z-wave devices are expensive. So I am learning about it, how to sketch and trying to understand C++ more. My dream is to build an outdoor ESP2866 combo, powered by an AC120v-5v module, with two PIR motion sensors, three 120v relay switches (two relays for two sets of security floodlights and one relay for an amp/wave speaker with mic), a photo (dusk/dawn) sensor and temperature/humidity sensor (for a future thermostat). Operationally, I imagine that it could be armed and disarmed through Blynk. When armed at daytime, a motion will trigger a low volume intruder MP3 warning alert with 10 minutes of security lights at night. But if the trigger persists for more than 5 minutes, the security floodlights will blink, a loud intruder alarm will sound and push phone notifications. What will be the best way to sketch these? What is the better way of wiring them together? How could I make multiple ESP2866s in the same WAN work together for an event? The desired function is if an alarm event is triggered in one of the ESP2866 that would also set off blinking lights and alarm sounds in the other ESPs. Thanks for all your help.

Posted by EeA2 1 year ago


The Crucible's Fire Cabaret

If you're going to this wild and wicked event, and you want to dress to kill, check out some ideas (and get tickets) here:  The Crucible's Fire Cabaret There are some other good ideas here on Instructables, too, for flapper dresses, tommy guns, how to do a finger wave, or headress.  This is gonna be one hot event -- you'll see some hot jazz and blues, and also jaw-dropping demonstrations in blacksmithing, welding, flameworking, and more -- accompanied by burlesque dancers, aerialists, contortionists, and other amazing talent.  Bring a camera too and strike a pose against a backdrop of fire sculptures, bootlegger cars, and a blazing industrialist environment.

Posted by plasmajan 8 years ago


Premonition?

Last night I dreamed of massive Earthly destruction by huge flaming rocks from the sky. It was really, really cool, but rather scary. Black sky, massive and multiple flaming rocks from above impacting with devastating effect (some distance away, but close enough to feel shock-waves). Not like the image, more real and hot-burning coals like (but that's the best I could manage to get for 2 mins of searching)If it happens soon it's a premonition?(I also dreamed that some landlord-bast's had been in while I was out and cleaned my place out of all the junk and important stuff like my furniture, PC etc and moved the stuff out of the shed into my lounge, but that was a completely separate scene and in daylight...)I was glad to wake up!

Posted by lemonie 9 years ago


sound-only area and cancellation

I'm looking for advice. (now this is difficult to explain but I'll try my best) I am trying to design a way to have a dance floor in an open area that will have an area where you can hear the music but away from the area it can't be heard. I'm attempting to do this using an array of speakers around the dance floor that will cancel out the music past the dance floor. Each speaker will face away from the area and be equipped with a microphone (directed torwards the main speaker) that then goes through and amplifier and then to the speaker (wired up so that it will emmit an opposing sound wave). This would essentially create a sound barier. I have attatched a picture as a visual aid.

Posted by Sun Gear 6 years ago


hearing electromagnetic stuff

Well, I was going to plug my ipod into some old computer speakers. my thumb touched the tip of the jack (ground) and it makes a buzzin noise. Big woop. No, as I go to reach my ipod it makes a big buzzing noise. what I was hearing was the electromagnetic waves. I reach for my cell phone and then a loud really highpitched noise ccame out. I waver my hand over my computer's power supply, I here a loud buzzing noise. How to do this: press tip of thumb to tip of 3.5mm jack turn your speakers up pretty high waver hand over complex electronics boy, do i have fun mornings, lol, being sarcastic

Posted by guyfrom7up 10 years ago


HAARP mind control?

Allegations have been made that the HAARP project is behind mind control experiments. The ex governor Jesse Ventura, interviewed a professor who demonstrated in his show that it is possible to send messages to people's minds without any need for hearing. The professor put two piezoelectric transducers on Ventura's chin and Ventura claimed to be able to "hear" music in his brain. Real science or pseudoscience? If this device could be made, wouldn't this device help people without hearing? What about the possibilities of learning devices or communication? I believe that this device could put thoughts on people's minds but not necessarily control them (unless it is an easy suggestible subject). Please watch a segment of the show and share your opinion:

Posted by blkhawk 6 years ago


Hey all ! anyone miss me? :-) ....

I can't stay for long, but wanted to bring you all up to date.... #1: I have been really busy with a couple of Asperger Forums and my own support group.. Over the weekend, while cleaning up, I started getting pains in the lower gut.  After it didn't go away in 5 hours, I dropped by the ER.  A CT scan indicated a new hernia, lower down and that the bladder was pushing itself into the hernia..   There is now a kind of a rush to get this fixed before the end of the year (deductibles and all)   Thought I would stop by quickly tonight and say HI !   And I hope you all are doing well. 

Posted by Goodhart 5 years ago


Pulse detonation(numerical simulation)

Hello everyone iam a Msc student now, i have done many projects over pulsejet engines which you could see in my instructables list. Now i have decided to do a project over pulse detonation engines, before beginning with the real one i thought that making a fluent simulation will be better. I have several tries to create the detonation front and atlast i succeeded in creating one. Take a look at the attached pictures which shows the development of a detonation front inside a long tube of 100cm. Further works will be updated soon. Want to see the sequence of deto wave formation please follow the link... http://www.4shared.com/archive/a4unsF-9/sequence1tar.html?

Posted by ganuganu 5 years ago


Interstellar (movie) ScienceFiction

Spoiler alert. The butler did it!!  Just kidding.                 Category: Weird Planets! Water Planet-  How'd they know that the sea was shallow enough to land in? The ship's engines apparently can't run if wet. So landing here was pretty risky. Would you land a plane in a foot of water not knowing if it was 1000' of water? You can't take off if the engines are wet!                         When a big wave hits, (on earth) one of the signs is that the water in a bay will recede. Why didnt this happen when the big waves hit in the film?   Ice Planet-  80% of earth's gravity (IIRC)  Yet a "frozen cloud" can hold up it's own weight. Fun world, very sculptural. Is there any way these shapes can hold themselves up?  Might be more believable if planet had 10% of earth gravity.  Those jump jets also more plausible in low G.                 Category: Black Hole Appearance-  At first, this seemed pretty artsy- bizzare. But i'd read that lots of research + computer modelling went into it. So here's my assumtion explaining the visual:  The black hole has a simple ring of hot debris orbiting it like the rings of saturn. This stuff isn't close enough to have it's light sucked in. Looking above, or below the "hole", Light from the backside of the ring is bent around to our "eyes" by gravity. This causes the illusion of a second ring perpendicular to the first one. If we coud "look"  with some means unaffected by gravity, we would "see" a single ring.                 Category: Demise of Earth IIRC, the crop  blight is "using up" the N2 in the atmosphere??  um...  Overall, a really good flick, addressing big human questions. Of course the human story is the most important, tough decisions face these characters....  but chat on sci should be fun, too. 

Posted by Toga_Dan 3 years ago


How can we build a cheap detector that senses a cellular (electromagnetic?) for use as a switch for a computer?

Hi all, we want to use a cellular phone as a "switch" to control a multimedia show. We thought of a cheap sensor that must be able to detect electromagnetic waves through a store window. We thought of phones because everyone has one in they pocket, phone is simply the source of the field. Idea is that customers can move their mobile phones in front of our store window to control a multimedia show in a simple way (forward, backward, pause), so in the end three or four different switches glued to the window would perform as a "control pad" for the computer. Maybe there is a way to base this project on products readily available which can be remodeled. Thanks for sour suppport and ideas! Nomax

Posted by nomax 8 years ago