Designing Definition and 577 Threads

Hi, I have started with cross-coupled gate structure of MOSFETs. This structure is for rectification of very low ac input voltages. I have found few problems like reverse leakage current and MOS not switching completely ON and OFF. So, I modified the design by using driver circuits for...

Hi Guys, Been researching peristaltic pumps, but can't find an industry standard in designing them. Wiki (http://en.wikipedia.org/wiki/Peristaltic_pump) has a little bit of maths on the occlusion, and a basic idea on calculating the flow rate and this article explains a little of the theory...

Hello, For my University project I am trying to design uprights for a race car. Currently we are using TIG welded 4130, I am trying to push the Titanium carbon direction. I have many questions! The idea of the upright is to use a titanium core (manufacture from laser sintering) then...

I am on a Formula Student team and we have decided to design our own brushless AC motor. Our main issue is how we will cool the motor, since we want to keep weight down while also increasing power output. We will be making the rotor from forged Titanium (Ti6Al4V) and the housing from forged...

Homework Statement Design an op-amp-based integrator with the dc gain equal to -10 V/V (use R1 = 200 Ω and R2 = 2 kΩ). Knowing the gain-bandwidth product of the μA741 op amp, find the proper value of a capacitance C of the integrator so that its 3dB frequency is 50 kHz. Homework Equations...

Hello, Could anyone help me understand what I am doing here. This is NOT a homework question. I am a mechanical engineer in my final year at uni, and my project is to design and build an airtrack for a range of undergraduate mechanical experiments. Im sure many of you have seen videos of...

Hello, I am in the process of designing a voice activate control system for my truck for various things like wiper motors/windows/etc. The development board I am using will have up to 20 outputs @ either 5 or 12V DC around 10mA. However, this is not strong enough to drive a wiper motor or...

I am a good DIYer, so I know I have the skills to solder a circuit together, but I can't design anything! Hoping a kind soul here can shed some light. I have a space heater that is being used to heat a very small space, and the problem is that on its lowest setting once the area comes up to...

Hello. I need to design a matching circuit to provide maximum power transfer from a generator with impedance Zg to a load with impedance ZL. The matching circuit has a length of transmission line with impedance Z0 and short circuit or open circuit stub with impedance Zs. I need to design with...

I am interested in knowing a little bit more on what would be the wisest way to create a lunar robot with the proper shielding for lunar conditions to do things like mining and lunar exploration. Also what kind of batteries would be best for these conditions? Also, say that there are robots...

Hello, As we know, when you blow over the neck of a bottle, it resonates at a certain frequency. I want to build a cylinder that will resonate at a certain wind speed: 4 mph or about 1.78 m/s I definitely know how to find the resonant frequency of a cylinder. However, I'm not sure what...

design a feed magazine for laptop computer hard drives to integrate into an existing electronic data destruction machine.this machine will be used to dispose of informaation technology devices and media. it is to be designed for 4 inches wide x 5 3/4 inches long x 1 inch thick desktop...

designing slider controller for controlling tilt angle of propellors I've been working on designing a tilt rotor. The propellers need to tilt from straight up to horizontally forward - 90 deg to 0 deg. I need to design the tilting mechanism, but more specifically at the moment, what I'm...

I want to design build and overall engineer a variable pitch turbocharger. This will go a long way in regulating both the hot and compressor sides flow rates, a larger turbo can essentially be used in smaller applications, and vice-versa. I want to use the VNT or VGT type turbos for my testbed.

Hello, I'm trying to improve the gain of my antenna using superstrate. I read a few journals regarding this topic but i could not determine the thickness of the superstrate needed. Any help would be greatly appreciated. Thanks..

Homework Statement You have two clock signals (one is 25/sec,other is 30/sec). Design a circuit that takes both clocks as inputs, determines the faster one within a second, and indicates faster one by lighting an led. The led should remain on until reset by a control signal. You may use...

Homework Statement Need to design a simple magnetic field generator of radius a= 2mm. The solid metal wire must carry a current density, jw, uniformly distributed over its cross section. The current density that must be found must have a magnetic field at a radial distance of r= 8mm from the...

Hello I am designing a solar oven that will be used to form denture moulds. My thoughts are designing an insulated box with a doubloe pane glass double creating a green house effect. But i would like to incorporate solar panels and a wired heated filament. My question is what is the...

I am a high school senior looking for advice about a career plan. I have some experience with CNC and am taking a few engineering courses through my high school. I want to design weapons for the military. However, I do not want to serve in the armed forces. I am looking to begin working with the...

hello everybody i'm a student to mechanical engineering and I'm in my last year of my studies. in this year i supose to make a project and in part of my project i need to know how to design a coil that will gives me 0.5 tesla inside the core of the coil. unfortunatly, after a lot of searches...

I'm somewhat confused on the nature of computer engineering. I'd like to know if it's worth my time to learn something. I want to be able to design a piece of digital hardware (this would be what I would need to learn, if it's worth it.) that I can program my own purpose in C or assembly...

Hey there, We are designing a rectangular duct composed of 4 metallic plates fastened together by bolts(or welded), where we will compress approximately 30 drinking cans, we are facing a problem by determining: 1- The thickness of the metallic plates that form the walls of the duct. 2- The...

Design a Turing machine for each of the following languages, give formal description of the TM and draw state diagram. {ai bj ck |i + k = j, and i,j ≥ 0, k ≥ 1}. Some example words of the language are asfollows: a. aabccc b. abbbbccccc c. ac d. bc

Hi all, I am trying to design a lowpass filter using the following conditions Passband edge f = 10 Khz (Ωp) passband stop f = 30 Khz (Ωs) Minimum stopband attenuation = 50db (1/A) Maximum passband attenuation = 0.4db( 1/\sqrt{1+ε2} ) and am having quite a lot of trouble with it. I have tried...

I am thinking about doing a coat that could help keeping someone alive when sleeping in the streets in the winter. Where I live, temperatures can easily reach -30 degrees celsius. Assuming the coat is well insulated and that the heating element is all over the inside of the jacket, what kind...

So. This annoying project attack's again. I have to create a box to catch an unadulterated egg at the base of my school balconies. Starting at 18 ft. I have no clue were to even start! worse part, its due very soon and my 'group' refuses to help. I do not know what to do. my only limits are the...

Homework Statement A voltage regulated power supply consists of a full bridge rectifier feeding into a filter capacitor, and then into an NPN bipolar junction transistor (BJT) operating as an emitter follower, and with the base of the BJT biased using a resistor and a zener diode. The power...

I've been given an 'assignment' of sorts (more of a thought exercise really) to mutate specific amino acid residues in a viral protein (from poliovirus) such that it can catalyse its own cleavage independently of RNA. I've learned from my own research that the usual cleavage mechanism...

Hello all! So if I wanted to make and order a part to a device I am designing, where would I go to do that? I know this may seem like a weird question but here is my situation. My brother has two graphics cards in his computer and there is a VERY thin space between them, and because of that...

Here's my problem: I want to design a cylindrical combustion chamber for a hybrid propelent rocket. Basically, I will burn paraffin and use oxygen as oxidant. As I will be using stainless steel, I thought I could approximate the maximum stress that must be resisted by the material through a...

Hi need some help here. I have designed a dc-dc boost converter to give output voltage of 11v from 6 v input. Well it has been implimented on PCB, works fine but one thing i din't understand well. The have adjusted the duty cycle to get my 11volts on load(LED Load), when i remove the load...

Homework Statement Using a 100-kOhm potentiometer and suitable external resistances, design a voltage divider circuit such that varying the wiper from end to end varies the gain over the range: a) 0 to 0.75 V/V b) 0.2 V/V to 1 V/V c) 0.1 V/V to 0.9 V/V Homework Equations Not Sure...

Hi all, I've applied to several UROP (Undergrad Research Opportunity Program) projects and I've gotten accepted to four, and one of them involves designing iPhone apps. The problem is... I've never programmed in Objective C, but I do know a fair amount of C++ (very basic OOP skills). Is...

I am a high school physics teacher in upstate NY. I am designing a new physics course and could use your help. I felt this forum was the best place for this post as the only other forum that may fit is the teacher sub forum, however, it appears to be little used and I would like input from...

Homework Statement Design a full-wave regulated power supply using a 5:1 center-tapped transformer and a 7.5 V, 1 W Zener diode. The power supply must provide a constant 7.5 V to a load varying from 120 to 450 . The input voltage is 120 V(rms), 60HZ.Homework Equations The Attempt at a Solution...

Dear All I want to design a Full motion Antenna. But I want to start from the scratch. Suppose I have a 1m parabolic Antenna and I want to install two motors (Elevation and Azimuth) The motors should be DC. And I want to know how to calculate all the parameters required to move the...

I came up with my own design problem, after completing a refrigeration design problem on the completion of my thermo I class. My design problem is this: I want to accelerate air to 56m/s via a compressor and then a nozzle. I'm trying to do a cost analysis of how much power I would save if the...

[FONT="Georgia"][SIZE="2"] Hi to everyone :-) I'm new to this forum. I'm an engineer working in a core field. I need to design brush less dc motor of 30 W power, Inout voltage-13.5 V. I'm struck in winding design . Could anyone help?

Ok here is my problem I have a system which is linked into a car. The system is an electrolysis unit designed to run at 5A. The system is wired in as per the 1st attached diagram. So positive and negative are taken from the battery and placed into a Ring Smartcom Towing relay (PN RCT460). This...

does engineering always require designing ?? As mentioned in the title , i would like to ask that does engineering always require designing ? I am currently in high school , and the reason i plan to for mechanical or electrical engineering is because it has physics and maths , and involves...

hello i have been given six weeks to design a low-power FM radio transmitter for my project however there are no lectures for this course so i have to do the research on my own. so far from researching on the web. i have found that a simple radio transmitter may consist of a number of stages...

Greetings, I've been looking at Physics forums few months ago, but I never taught of making an account. So now I'am motivated and I have made one and this is my first post. I'am 17 years old, I'am a Java programmer. I have wide knowledge of many things in the computer world. I have a...

Homework Statement The problem is in attached. Desgining basic beam Homework Equations M = E*I(d^2*w/dx^2) slope = E*I (dw/dy) = integral of E*I(d^2*w/dx) + c1 deflection = E*I * (w) = double integral of E*I(d^2*w/dx) + c1x + c2 ΣM*= 0 ΣFx = 0 ΣFy = 0 Yb = ΣAY / ΣA I =...

so I am creating a simple electric motor and I need a circuit that will cut the power if it is stalled (since it can create a short if it is stalled, draining/damaging the batteries) - the problem is that it also creates a short for a small period of time while in regular use I would like to...

I am a third year chemical engineering student and don't have much experience in the mechanical stream so I was hoping someone here could help me. At the moment I have an apparatus that consists of a sheet of metal with four syringes sticking through (metal sheet is horizontal, syringes are...

[FONT="Arial"]Hey all! I am thinking of building a box in which the insides can be held a constant temperature. I would like to see if I can determine some parameters for the box. My first step is to determine heat loss through the box. I'm estimating that the largest difference in heat...

I have an optical design question - hopefully this is the right forum in which to ask. It is "engineer", but it's really optical engineering... --------------------------------------------------------------------------------- I am wondering if someone can help me out here with a few...

Hey, I designed a kalman filter for my project. But how can I determine the correct values for Q and R? Thx!

Hi all, I'm studying computer aided design at university but i have to complete an electronics module. My knowledge is extremely basic and my lecturer 'does not have the time to go through basic physics' so i need a little help. I have been asked to... 'Design a coil which has a given...

a beam with an effective span of 8.2m is required to carry uniformly disributed loading of gk = 12 kNm-1(in additon to its own self weight) and qk = 10kNm-1. design a suiable reinforced concrete beam using strength class C30 concrete and high yield reinforcement could somone check my...