Build Definition and 466 Threads

I have constructed a wind tunnel with approximately 15 x 15 in. cross-sectional area test section. Where can i get some ideas/plans to build a simple force balance that can measure lift and drag forces simultaneously? Currently I'm using a single-axis button load-cell setup to measure...

Will someone please tell me where I can get some plans to make an autogyro. I would like some basic plans for a 1 or 2 seat autogyro.

I'm wanting to build a RC bandpass filter to pass only 60Hz. But I do not know what capacitors and resistors to use. Can anyone tell me what capacitor and resistors I should use?

How i can build a cheap and big Laser ? (please insert pic)

Post any thing you want to build but have not time/resources to do so, I want to build a three wheeled electric powered car, i have ideas to make it a practical home build project, first the body will be a monoquoc made from ply wood, the front suspension will be a (unit) that bolts to the...

Have any of you seen Iron Man? My dream is to be something of a Tony Stark. A weapons engineer. Forget all the super hero stuff, I would like to design weapons. Talk softly but carry a big stick and if you want to maintain peace, make sure your stick is bigger than anyone elses. My...

http://www.quixtar.com/ I saw that Amway now has a slick advertising campaign running on TV. I don't have the time to comment on this in detail right now, but I can say that I got involved in Amway when I was 18 years old. I had a downline of over 50 people, including one of the richest men...

i want to build a helicopter at my home. i only have a wish, whaich is referred to as idea in physics. can some one tell me the guide points about it. the helicopter should be able to hold a single person or about 70 kg. i am in Pakistan, Karachi. i have no idea where to get all the equipment...

Hmm, how fundamentally important is this device? http://www.pcworld.com/businesscenter/article/145365/hp_researchers_build_intelligent_memory.html http://www.physorg.com/news128786808.html Sounds like it could enable electronics to obsolete us ;)

hey guys i need to build a single seater hovercraft... any ideas or suggetions...?

First off thanks for the quick replys on my first post. Now, I'm looking to build a home-made generator, I've been told that I can just reverse the motion of a electric motor and *poof* it becomes a generator, is this true? And I was also considering just using a automobile alternator as my...

Homework Statement One can buy 1 Farad capacitors which are only a few centimeters long. Speculate on how you can build such a capacitor. Assuming that you are using Strontium Titanate as the dielectric find the minimum gap for a maximum voltage of 5 volts. Find the effective area required to...

how do i build the third vector of this operator? http://img212.imageshack.us/my.php?image=img86161am0.jpg i have found two vectors of the operator but it defined as R3 so i don't know by what laws should i go in order to build the third one i also got dim ker differ =0 so it has...

What are the forces that we need to consider when constructing a building? when there are tree that can resist an earthquake why can't a building resist it?

http://img258.imageshack.us/img258/3518/01ck5.png I would like to build a logistic differential equation for US oil production from the given data above. dP/dt = k(1-P/N)P I tried many different models but nothing came close to the given data. Any help and suggestion?

Background: I am a first year PhD student and I just started graduate school this January. My background is in ME so this is a bit out of my realm. My current project requires the use of a tubular linear motor, possibly similar to the one shown here...

I'll preface this with the fact that I know nothing about math or physics, I'm not even sure this is a physics question. But I hope you all can help. A little background In 1966 Congress passed the federal Animal Welfare Act (AWA). Today the AWA regulates the commercial production of...

I know what a capacitor, resistor , variable resistor, diode ,transitor , is and how they work, and some basic calculations on each of them. I know kirchoff, ohms law,etc. My problem is how do I know what and what to put together to get a transmitter or a reciever or amplifier without looking...

Homework Statement weight limit-100grams roadbed must span 500mm of gap must provide space for hook (15mm x 15mm) Must be only built of round toothpicks and glue. Anybody have a clue How to do this/ Homework Equations LUCK?? The Attempt at a Solution i FIGURED i would do a...

I am currently doing research in an attempt to write a book. This thread constitutes part of that research, as I am exploring all avenues. Part of the plot includes time travel. (cliche' I know, but it fascinates me) So if you would be so kind, can anyone please try and help provide me with...

Hi, I am a high school student and for a class projecI have to build a boomilever. Except for the atachment base I can only use wood and glue. Any type of glue can be used. Inculding gussets, it must be constructed of wood no longer than 1/4 inch high and 1/4 inch wide in cross-section. If...

I would like to build a dehumidifier. I don't even know where to start. I read that refridgerative coils are use in mechanical dehumidifiers. How should I go about doing this, or is it inviable?

Suppose I have 2 input signals V1 and V2, And I want my output signal to alternate from V1 to V2 and so on at a particular frequency. Any idea what components can help me to achieve this goal?? Thank you

How to build a kwh meter?? I would like to seek some information on how to build a kwh meter to check the power consumption for my school robotic project? Please tell me what are the components that are required to build one? Thank you. Regards, Gyro

How to build a universe. 1. Figure out how our universe is built 2. Determine if the data from CERN tell us that the smallest building blocks are at 10^-18. 3. Figure out why #12 keeps cropping up in so many approaches. 4. Figure out the dynamics. ---------- For a more detail...

Is it possible to build an ion cannon(it's a super weapon that orbits around the Earth in space) with the technology we currently have or will have within the next 5-10 yrs?

:confused: hi there, I am building a hovercraft in my garage, so far it has gone perfect... until i get to the thrust part! for some reason i can't get the darn thing to move! for lift i have a kawasaki back pack blower pushing air down into an air mattress with holes punched in it and it...

Help! I need to make an adjustable timer circuit with 7-Segment Display Readout for a science project. Please help.. I don't also want to spend a lot of money on this, so please tell the parts and circuit diagram I need. Thanks in advance. -Circuit Man

hi.. i m new here.. quite recently, i hav turned my attention to radio controls. i also built one but blew it up coz of messy power supply. what i want to know is that if i buy a complete radio control kit from a hobby shop, ll i be able to assmble it myself n ll there be any manuals for...

Without any doubt, Maxwell's theory of electromagnetism is the foundation of modern physics and relativity. I am always impressed by how it is easy to learn, and conversly I am disappointed by my ignorance about how Maxwell did his job. Would some of you know about a good reference...

Ok, so I am spose to build a robot for physics class as the last project. Me and my friends thought we should build a RC car with an LED heart on the top. THe problem is we are in need of direction. Does anybody know what is needed and what needs to be done to build a small RC car? If so please...

Hi, I'm currently making a hydrophone and I'm planning to use a piezo crystal as a sound receiver whose output I then intend to put through an op-amp. Berkeman recently raised an interesting point about voltage issues with op-amps so I thought I'd pose this question before proceeding any...

Homework Statement I need to build an electric motor. I can only use some type of iron bar (maybe a steel nail) copper wire, a frame (to hold it all together). I am giong to need a commutator (probably try to cut a copper pipe in half maybe). Can anyone try to give nay tips or suggestions...

Ok so I know that this seems like an absolutely absurd and almost impossible idea but I want to build a nuclear reactor to enter in the state science fair next year. I know that it takes time, wit and money but I'm completely prepared to take on the challenge. So the point of posting this...

my fourth quarter project is that i have to build a physics apparatus. it can be a model but i think my teacher prefers it if the apparatus i build actually performs the task it's supposed to. I've been researching but i can't find any good ideas. building a circuit is an obvious choice but its...

Our teacher wants us to construct a speaker that can provide sound (that can be heard from anywhere within the classroom) when connected to wires that are hooked up to some sort of device. I'm unsure of where to start and where to get the supplies. Since we are on the magnetism course, I know...

I've actually been wanting to build one of these. For those of you who don't know how they work, pretty much all it is is that you have a power source, two rails for current to go through (hence the name railgun), and then you have a projectile that is conductive. The current creates a magnetic...

I would like to build a Balun Transformer: to balance Coax 50 Ohm to 100 Ohm twisted pair. Is there any good site for begineers?

how to make a pinhole camera for my school project.any suggestions?

A friend of mine and I have been working on a science fair project but have run into a small problem. The Electro-Magnet that we have built is melting the wire that we have and we cannot buy any stronger wire because we do not have a place where we could buy any stonger wire. We were wondering...

I want to build an electronic device that transmits ultrasounds (I guess that is in the LF frequency range [?]). Does anyone know where I can find a kit that creates ultrasounds?

I was initially going to use just an AC transformer and then some diodes to full way rectify and finally a capacitor on the end to convert to DC. This is probably unrealistic though due to the reverse biasing of the diodes... Anyone have a good schematic for building s 25kv-35kv DC power supply?

Hi all, I have to build a model plane that has to fly 20m and has to fly through a holla hoop at the end that is upright. To do this, we can use any materials such as wood, paper etc... Do you guys have ideas as to how to approach this? I have been racking my brains abt this for weeks...

My country highiest broadband speed is only 2 Mb/s but I heard that some country has up to 100 Mb/s broadband speed . So, I wondered if I can become an isp with such speed but I don't know how ? Do I need to have a lot of ip ? What is the hardware/software requirement ? A nyone can give me...

Hello... I am an electrical engineering student & currently taking some system & signals courses... I was wondering if learning Simulink(Matlab) would help me build systems to process & control signals... maybe applying what am studying on simulink!... And if so... can u please recommend a...

Rather than jump off of the deep end into endless possibilities. I will gladly allow anyone to explain this. http://www.halliburton.com/default/main/halliburton/eng/news/source_files/news.jsp?newsurl=/default/main/halliburton/eng/news/source_files/press_release/2006/kbrnws_012406.html

Hi, I just popped into see if there are any budding young engineers here (hope I got the right forum) interested in helping with a problem that I have been nutting out over the years... Hope your forum can help. It is all about controlling sway and buckling of members and gaining the full...

Hi y'll. I am majoring in Electrical Engineering and I am currently in the 2nd year. I love to build things out of scratch (and unfortunately break precious electronic gizmos to see how they work). But I also love mathematics and physics. So I was wondering, which of these following areas should...

hi.. i am into astronomy as a hobby and i noticed as i was looking for telescopes that the telescopes u buy are not that flexible and that u have to buy a telescope for each type of observong ( to have the best quality of course). so i made up my mind to build my own telescope(a refractor)...

i am stuck. i have no idea how to start on this project. I have to build a power supply that produces 5.0V regulated. i can't use regulators so i have to build it but i have no idea how to get started. i have an ac course to start with. i would appreciate any ideas, insights or designs you might...