Designing Definition and 577 Threads

So we have an egg drop project due at the end of the semester for my introductory physics class. We're dropping it from the second story, which is about 3 meters down I believe. The materials we are given are 20 drinking straws, 30 cm of tape, and 1 8x11 piece of paper that we can cut/fold and...

i am designing a stepped attenuator using pin diode as a switch in microwave office. i am having difficulty in using pin diode as a switch. i knw it is operate in forward bias and open in reverse bias. if i am giving a rf signal between 300 Mhz to 3 Ghz then how can i switch it to reverse bias...

designing a two-bit adder using verilog's primitive gates_I get "z" for my outputs Hi, I am trying to write verilog code for a two bit adder using verilog's primitive gates. I had implemented a two bit adder before...using gates I myself had implemented with nmos and pmos transistors, with...

hi all look i haven't finished the control I subject ..and the Dr ask us for a project. i've got an idea i want to design and satlight with two motor if anyone can help me with the basic i would be greatfull if there any site can explain that ..please i need it

Homework Statement Device requires a terminal voltage of 12 volts and a current of 2 Amps. Design a circuit using as many 3 ohm resistors as needed to properly power this device. The EMF is 24 Volts. Homework Equations Ohm's law: V=IR The Attempt at a Solution I know how to find...

Hey guys and gals! first time poster so be gentle...I'm wanting to make a small jet turbine from scratch but I am totally baffled by how to design the compressor and turbine stages for compressing the air and extracting power from the exhaust gas to drive the compressor. i would ideally like a...

Homework Statement There is an unstayed mast which is 3m long, supported at the bottom and at 0.5m from the bottom. Sail area is 10 m^2, design wind speed is 50 km/h. It is made from glass epoxy composite. The base fiber is 300 g/m^2 glass textile. E-glass, 2/2 twill. The inner diameter...

A few weeks ago, I decided to challenge myself, and design a wooden pendulum clock. It's been loads of fun, especially the hard parts. One such hard part prompted me to make this thread. Here is the problem: Like any regular clock, The hour, minute and second hands are on the same axis...

How do I determine magnetic spacing when designing a generator which has magnets placed evenly in a circular pattern so that each magnet do not affect one another when they are going to be spun around a wheel full of coil. How do I determine the Volts generated? How do I determine the...

can i design a mechanical seal ?

Hi friends, This is my first post here in this forum. hope to hear as well as contribute to this forum in whatever best possible ways I can. Here I am with my problem domain. peeling off the coconut husk from the coconut. especially when the coconut husk is totally dried up. This...

Hello, I'd like to say hi to everyone since I'm pretty new here, and I guess my first post goes directly to asking a question. Anyway, could someone here recommend me some program for designing parts of a jet or a space vehicle that resembles a delta winged jet. I'm doing this for learning...

Hi ,i am doing an project 'Designing a wing' ,Can anyone please tell me which software do we use for designing a wing,i searched on the web but didn't find the appropriate one. many thanks.

Hello, I have two 120V sources. One is inverter and one is normal AC from sticking contact. And i want only one of them as output. Output will be from inverter or 120V from sticking contact. I want normal AC from sticking contact to be active. If it is shutdown so i want output will...

Hey, I'm looking for some ideas how to design a motor driver for a pair of DC motors. They have a input variable voltage of 0v-3.3v. When the input voltage is half (about 1.6v) the motor should stop, but if it is any greater than 1.6v it will go forward, below 1.6 it will go backward. 0v...

heyy...i'm designing a crank for a mechanism...and i need to counterweight it...is there any formula which tells u how much counterweight to add...its a low speed mechanism and very light...material mostly plastic or wood

Hi, New to the forum, I'm currently studying Mechanical Engineering, however me and my flatmate really want to start designing and building circuit boards. I have minimal knowledge when it comes to electronics so there's no time like the present to start learning! What kind of software...

Hello all , We have to design gear to move a weight of 0.2kg over a distance of 0.1905m so we know the torque that comes up to =0.2*9.81*0.1905=0.37361N-m ...how do I decide the diameter ...number of teeth on pinion and driven gear ...wat are all the parameters shuld I consider for designing...

hi .. i am doing a poject for my college and .. i design the amplifier but when i connect to the speaker circuit ...of cource u konw it npn and pnp transistor .. the proplem is that i have to get to source on +ve and _ve is there any circuit that i can have the right...

how to ? i am a maintenance engineer dealling with many mechanical elements specially in power transmission like gear trains and many gear boxes and hydraulic circuits but i have left my career to another one that will make me workin in the design of water systems and pump sellection , so...

Hi, I'm curious about how vacuum systems work... I was advised to try posting this here, hopefully it's the right place. So if you're designing a high vacuum system, how do you actually operate it? For example if you have a chamber connected to an oil diffusion pump connected to a rotary...

Now, i am looking for something to get me started with designing wheels for a car. What i want is to make light-weight wheels strong enough to hold around about 200 kg weight. (4-wheels). To give you an idea of what i am looking for, in designing a chassis, we want the frame to be able to...

Homework Statement I want to know the affect of stator design on bicycle dynamo performance using magnetic circuits, and power output. The bicycle dynamo is a single phase AC generator with permanent magnets on its rotor (mounted on hubshell) and a lundell type armature(mounted on bike axle)...

Homework Statement Using the level shifter shown below, design a circuit that will shift a signal from from +/- 25 volts (50 volts P-P) to 0 to 5 volts. Assume R1=R3=100K and R2=R4. In answer 1 give the value for Vref with 1 decimal point of precision in answer 2 gie the value for R2=R4...

Homework Statement I'm to design a crane, and therefore I need to find the reactions in the jib and also make the crane stable. 1. I need to find the max. load that the crane is able to lift. Therefore i have to find the reactions where the horisontal and vertical boom is meeting. 2. I need...

Homework Statement The problem is to design a cantilever beam with a certain resonant frequency. Homework Equations w = sqrt (k/m) The Attempt at a Solution I know k for a beam and m can be written as density * volume. My question deals with the w. If I am given a...

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I have started working on trying to design some better antennas for the cave radios in use for radiolocation and general caver communications. Most of the antennas I have seen are loop antennas operating at 65 or 130-ish kHz. I am open to all sorts of antennas. Of course no matter what...

I have built a nice biomass gasifier that produces about 700,000 btu's of heat per hour by burning or flaring the gas that comes out of it. What I want to do is, to flare the gas in an enclosed chamber so I would be able to capture all the exhaust and run it through some heat exchangers for...

I am in the process of designing a hitch for my motorcycle. Realistically it is strong enough unless i pull more weight than i really should. That said I still should make it stronger in case of the foreseen, like when i got rear ended. Before i get to the pictures, what I have now is...

Ok so i received the suggestion to get such a power supply by rigging a variac to a bridge rectifier, but variacs are rather expensive, so after some snooping around i came around this site: http://www.scribd.com/doc/9779212/ebook-free-energy-50000-vdc-power-supply they basically just use...

Sirs, I need to make a pump to draw molten aluminum from one container to another container. The first container height is 1.5m. I wish to us a screw enclosed within a cylinder and powered by a motor. Can anyone help me with the detail design of the screw and cylinder? I welcome any other design...

Im finding it really difficult to calculate the volume of a pressure vessel for my project. I have been only given values of pressure and temperature, where the pressure is 80psi and temperature is at room temp. Its difficult using the ideal gas law as i don't know the number of moles, nor i...

am designing a autonomous underwater vehicle .well,i got 2 issues right now regarding its buoyancy control and water proof joints. can anyone suggest me some ways by which the buoyancy can be controlled and some methods to make the joints of auv water proof efficiently.

Designing a circuit from a given transfer function. I hope you don't mind that I haven't used the default format. It doesn't lend itself well to my problem. The original problem is as follows: We were given a 'black box' that contained a passive circuit and we experimentally determined a...

Homework Statement "Design a bridge over a valley 300m wide. Road surface is supported by a truss underneath." My problem: With calculations Now calculation for buckling says i need to design the truss for compression such that I > (P. L^2) / (pi^2 x E ) or Pcr > P where I = reduction value...

Homework Statement Design a charge distribution so that the resulting E is proportional to r^2. The Attempt at a Solution This is not really a homework problem just something our professor told us to think about at the end of our lecture. It made me really curious as to how you would do...

heyy guys i am participating in an aero competition in which the problem stmt is to design an acrobatic hand launched rc plane of wingspan 3 ft max which can perform stunts like a vertical loop, sharp turns and 360 roll...can you please tell me how to begin designing this aircraft...i...

Helo, I am currently designing a controller whice goal is stabilizing (by means of feedback) a known plant. The design is carried out with matlab. Now, there is an option of using the gui "sisotool" for the controller design. The problem is that i want the closed loop system to meet...

I'm looking to drive a small, 5 watt generator from compressed air (psig>60) and while being fairly frugal with the air (<.25 ft^3/min). I hope to have the base and spindle cut using a common three axis mill. Hears where I need help - I don't know how the control surfaces should be shaped or...

Hello! Lastly i was designing a toy car moving in both direction foward and backward using relays and switches. I thank everybody who helped me. Now i want to move to h-bridge. i have read many books about the h-bridge but one problem that i still have is how to chose power FET transistors...

Homework Statement Is there such experiment to detect pipe leakage using radiation? I have opted to use radio-isotopes conduct this experiment. Homework Equations None The Attempt at a Solution How do i go forward with designing this experiment, knowing that I can use...

You are designing a delivery ramp for crates containing exercise equipment. The crates weighing F_1 will move at a speed of v at the top of a ramp that slopes downward at an angle \phi. The ramp exerts a kinetic friction force of F_2 on each crate, and the maximum static friction force also has...

If you were to design a pulse jet engine where would you start? How do you determine the diameter and length of the tail pipe? How do you determine the diameter and length of the combustion chamber? How do you determine the area of the air intake valve system? How do you determine...

Firstly, I am starting my senior year in Electrical Engineering once school starts, and I feel that I am in dire need of some more "hands on" experience with the equipment. At my uni, the EE degree is split up into a Physics path, and a technology path. I'm thinking that may be a bad idea...

Hi All, I would really like your help in my design project, which is about desgining, as mentioned in the title, an oscillator with 2.455 GHz frequencey. I want it to be efficent to the greatest extent, meaning the lowest power consumption possible and greatest stablitiy. I'm confused...

For one of my classes, I have to design a gearbox. i am currently going through some calculations, but before I get too far in, I would like to know where one can find a list/catalog of readily available gear sizes/pitches. The gearbox clearly has to satisfy certain load carrying parameters...

Over the past few years I have like many of you become interested in renewable energy. Over the past few months we have gotten a lot of rain. We also have a small creek in our pasture and it begins with 2-12 inch field tiles. The end (beginning i guess) has been filling with silt over the...

Hi, I know basics of gear design but have never designed a gear before. I want to know, while designing a spur gear what is defined first 1] Pitch Circle or 2] Base Circle ? In case. if base circle is defined first, then how to determine its diameter ? Lot of design materials...

Hello everyone, I'm just getting started in studying radio frequency design and have a question about amplifiers with a tuned circuit as the load. When setting the operating point of a standard class A transistor amplifier with a resistive load, one uses the collector resistor to set the...