Build Definition and 466 Threads

Well here are a couple of things I would like to know. Thanks in advance! how to build a Frequency-Modulated Radar gun. or how to build a Frequency-Modulated transmitter and reciever or where i can get either of these :D Thanks again!

I took AP Calc BC already and I am entering as a freshman, should i take freshman Calculus again? How many freshman calculus courses actually go through these topics? 1. Hyperbolic integration/derivatives 2. telescoping series 3. Work 4. Fluid Pressure 5. Moments of Inertia 6. Center of Mass...

Hi all, Sorry if this is an incorrect part of the forum. Living a relatively sedentary lifestyle, consuming a Western diet, living in an area where drivers see pedestrians/cyclists as moving targets to run over and after packing on a few pounds, it got me thinking. I'd like to (as a...

I want to build a "Betavoltaic Battery" A while ago I got a tritium keychain that will glow for 10 years, and since then I've gotten very interested in building a generator based on this. Originally I wanted to build a conventional RTG but apparently it is hard to find radioactive materials...

In this instance forgo the particle part. I'm thinking more here like the way a railgun works. Or how some rollacosters can take you from 0 to 60kmph. Lets say we wanted to make a railgun that uses a large loop to continual increase velocity to a desired point, then release it into an...

Hi As an assignment for uni, we had to design and build a derrick crane. After having designed it on catia, I've realized i haven't made any tolerances for any of the holes. All the holes are 8mm and 6mm diameter, but i don't know what tolerance limits I should put, as we built the crane...

Just curious how long an adult person can stay in an average small (W=2.5metre x L=3.5m x H=2.4m) bedroom with the door & window shut before CO2 levels become dangerous? And what about a small room like ~ w1.4m x L1.4m x h1.6m? I assume the small size would make a dramatic difference? Because...

Hi guys, As I've tried to convey using the topic title, I would like to know if (and how large the effect would be) one gets charged by using an ordinary capacitive touchscreen. From what I've understood, the projective capacitive touchscreens have the conductive layers (the wires I mean)...

I'm planning on building a platform for Olympic weightlifting. I'm trying to minimize the weight, so I'd like to be able to properly estimate the sturdiness. The first one is for a piece of wood sitting on beams of some sort. I know that as the beams move father and farther apart, the board can...

"VOLTAGE-CONTROLLED AMPLIFIER". I am required to build a voltage-controlled amplifier Homework Statement [SIZE="4"]"VOLTAGE-CONTROLLED AMPLIFIER". I am required to build a voltage-controlled amplifier,using: 1 operational amplifier(741), 1 capacitor between 1 to 10 microfarad(Electrolytic...

Does anybody have any tips/ advice on building a simple cyclotron? I read about Michio Kaku making an accelorater when he was a teen and was wondering how to make one.

Hi, which nation plans to build the most nuclear plants 2010-2020? China? India? France? Does the US lead in nuclear plant technology and engineering? Will any new nuclear plants be built in the US within next several years?

Hi. I am clueless about engineering, but I want to build a workout bench and workout equipment. What would be the best book to get for load information and structural integrity. Would this be considered mechanical engineering or material? I have no idea thanks for your help!

Hey, first off I want to say that I don't have much background with physics (that's the reason I don't know where to put this thread at, because I have no clue of what kind of physics this contains) even though I would love to. But anyways, I was thinking randomly the other day and I was...

Hey Guys, Just curiosity, but if a metal surface has a build up of calcium does this mean there is a higher chance of corrosion occurring? Or can it accelerate corrosion? Or is the build up on the surface of metal generally harmless?

I need to discharge a lot of current into an inductive load from a large capacitive bank. Ideally the current waveform would be as close to a flat-top as possible. Typically this seems to be done either by switching many caps in sequence using SCRs into a filter network to remove ripple or by...

I want 2 build a remote control circuit , but don't know how ! Who can teach me?

So I know little about engineering. But I do know a thing or two about programming in c++ now. I've disassembled many electronics (MANYMANYMANY) IN my house. Like we have all sorts of things I could just take apart. Since I know little about robots and engineering them I decided I'd also...

By "static" in this thread, I mean the charge and current density is constant in time (so things can be moving, but the distribution cannot). We can build an arbitrary eletrostatic field with a "eletric monopole" density. Since Del.B=0, can we build an arbitrary magnetostatic field with just...

Books to build "physical intuition" All physicists say that it is very important to have this thing called physical intuition. I have a general idea what it means but I don't quite fully get the subtleties between physical intuition about a topic in physics versus understanding the equations...

So I've decided that I want to build a Dodge Charger, in the style of the 60s or 70s, after I finish engineering of course. http://en.wikipedia.org/wiki/Dodge_Charger_%28B-body%29 Either the one at the top of the page, or the one under the 'second generation heading. It's more of an...

I messed up on the title of the thread.. I had a few questions but ended up solving them on my own. The only question I have is how to solve this ODE. Thanks. Homework Statement Solve the ODE (dx/dt)= f(t) - .1x Where f(t) = 2+sin(t)2. The attempt at a solution I faintly remember doing...

I am not a student but should become one again as I apparently did not learn enough in school. I am faced with a real world question I do not know how to answer using mathematics. Here is the problem without too much physical detail: I need to construct a circle (rough circle) out of 31...

Not asking for a schematic, more a notion of roughly how challenging this will be.

http://www.lns.cornell.edu/~adf4/cloud.html" Has anyone tried this? It looks really cool, and I am thinking about giving it a shot, but I'd like to know how easy it is to get it working, or if there are any other things I should know. One thing I am concerned about is the directions say...

hey guys I'm trying to build a 38khz transmitter that works about 5m(at least) but its unsuccessful.currently I'm using this circuit. but it can't use more than 50cm. i have no idea how to increase rage. equation is f=1/(0.8*R1*C1) I have some NE555 and a 9V battery some transistors and...

Yes, the subject sounds stupid but the question is even stupider! ever since I was a kid I've liked building things, especially with electronics but I've never had any real education towards it etc etc no skills blah blah. Right now I want to build an IR pen for a project that was posted a...

Hey, I'm trying to build a stroboscope for measuring the RPM of a few different fans. So far I've tried using LEDs but haven't been very successful. I tried using a function generator with square pulses (I tried both 20% duty cycle and 50%). So I started at 1 Hz and kept on increasing the...

Hello everyone, I've difficulty on finding a path to my engineering career. I've a B.Sc. in Mechanical Engineering from a reputable top 50 engineering program U.S. university. I'm certain that I've fully capabled to cover entry-level engineering responsibilities and climb up to the top from...

Homework Statement Hey, For one of our final lab projects, we have to (less design and more build) an electric DC motor on a 6V DC battery. Restrictions/Requirements: No plastic parts can be used The motor must run for at least 60 seconds No simple motors allowed "not-simple" means, it must...

I am a student at ungku omar polytechnic.i want to ask someone that is good in engineering robot.i want to know how to make the cylindrical robot,do i have to used ball screw or belting as an actuator.I want to a build a small robot only about 550mm long and 650 mm hight.It can pull load of...

Hi all! I am new to this forum and i know nothing about mechanical engineering.I have degrees in electrical engineering and computer science.I wish to build a food oil expeller and want to know the mechanical engineering basics i need to study before i venture on the project.Any pointers will...

http://party.windycitynovelties.com/search?w=bls042dz2&asug=&submit.x=0&submit.y=0" is the hacky sack, it weighs 50-60g and is about 2" in diameter The launcher has to fit inside a 15" cube when set, weigh less than 15 lbs. and has to use purely mechanical power, compressed air not included...

HI, I am essentially trying to make a car jack style machine except to crush cans rather than to jack up cars. I do not know much about pneumatic systems and how complex they are. The concept will be that a hand operated pneumatic device will crush a can against the housing. I have been...

we were given a project in physics where you build a catapult that shoots a tennis ball 2, 4, or 6m. Now i have a basic design that I am not sure if it will shoot 2m. all i need is the ball to be able to shoot 2m into a 5 gallon bucket. here is the design i am loooking at...

I need to build something! hi, i know that if you can make certian devices, it can increase your chance at getting in a great school. i only know calculus (some differential) and basic calculus based physics, however i lean ultra fast (so if its i little bit over my head, i can figure it out...

I need some help how to build 8 bit up/down counter for my tracking ADC. All ideas are welcome.

Requirements: Between .5cm and 1cm large. It must negotiate 3-D space in an air atmosphere. It must be capable of autonomous existence. It must be capable of high-g acceleration to rapidly start and stop. It must be able to remain stationary on a surface at any spatial orientation. It...

Hello, Not sure if this is the right place to post (new here) but here goes. I'm a college freshman in the US and am pursuing a major in math. I feel that I have a rather weak background in math: I took the same garbage courses in high school as everyone else, never really paid too much...

I will most likely have access to the important materials, but where could i find the instructions?'

hi ! i want to build a LFR but i dnt know where to start from...cud u please help me in getting the proper guidance.i need proper circuit diagram for building it out...it is my final year project n hav to submit in less than 10 days... i want to a microcontroller,ULN2803,IR sENSORS etc...nw...

IBM to build brain-like computers By Jason Palmer Science and technology reporter, BBC News http://news.bbc.co.uk/2/hi/science/nature/7740484.stm

I've long been planning to create an interface which provides an overview of my data. I'm not sure how to get started so I'm looking for advice. I'm a numerical relativist and I do a lot of simulations. I organize these by running in directories which I label by date. These directories...

I am interested in making solar panel with TIO2 dye-sensitized solar cells for science fair. Can anyone help me?

I also posted this under Computer Science incorrectly... I am curious if anybody knows how to build an Electromagnetic Pulse Generator (aka EMP). I've looked for a guide online, but all of the ones I've seen are far too advanced and/or powerful for my purposes. I'm looking for about a 5'...

I have a project to do for my Physics class in grade 11. I have to design and build a car that will move in a forward direction. The source of energy for this car must be a suspended mass. The mass can be anything that is located anywhere. The car cannot have any other source of energy. It also...

I was thinking that it's possible to make a sort of "piano" using solenoids. If you had a spring to reset it, and the "keys" of the "piano" activated simple contact switches, it could be done, right? It wouldn't be a terrible strain on the batteries if the contact were as short as pressing...

I am trying to make my own Reverse Osmosis water filter, and I need some help. Can someone tell me where I can find parts for it so I can make it myself instead of spending $150 on it? Thank you.

Or any specific requirments formulas that will help me on my way in building one please. Moderator's note: this thread is from 2008.

A number of 10 digits is build up in the following way: The first digit is divisible by one. The first two digits are divisible by two. The first three digits are divisible by three. ... What is the number if 0,1,...,10 can only be used once? I can reason that the last digit is 0 and the...