Device Definition and 509 Threads

Hi, Some of the ICs for a portable device I'm making need to be attached to ground. However, the device needs to be wireless so I can't ground it the way we usually do. Is there any way around this, such as a circuit that could somehow act as ground? Thanks.

Hi everyone, I am student of Ocean Engineering and now I am in process designing a model of wave power plant based on OWC. For that, I need Wells turbine for generator. I don't have many experiences in electricity engineering so do anyone have diagram to build simple Wells Turbine ? Thanks...

I was just thinking about this the other day... Given any 'blackbox' circuit, for which the values of the thevenin voltage and thevenin resistance are known. And given that a non-linear device is placed across the terminals of the circuit. What relation would one use to find the current...

I'm don't think these people were joking when they wrote this article: The article is filled with claims like this from all over: If it is a make people stupid weapon, it seems to be working quite well.

Hey guys...i'm trying to locate a servo or similar device that has just three basic stipulations... It needs to: -Be able to turn a thin 6 inch diameter plastic wheel (negligible weight, no resistance as it's not attached to anything but the servo) -Complete at least a half revolution in...

There is nothing I have tell before I go about on this madcap search. The problem is that I'm only 12 and searching for a device (or a circuit) which changes, or swaps, polarities, every time the switch (a switch made from a phototransistor and a resistor, in essence, getting activated...

I'll try to keep this concise. I am trying to build a alarm system for the DAQ system in my lab that will be software (LabVIEW) based and will replace the current hardware tripped alarms. Right now I am working on a final fail-safe alarm to protect against the freezing of the "alarm server"...

What is the most powerful battery or way to store energy? I have an idea but I wanted to see what you guys would say :)

Homework Statement A closed system comprising a cylinder and frictionless piston contains 1kg of a perfect gas of which molecular mass is 26. The piston is loaded so that the pressure is constant at 200kPa. Heat is supplied causing the gas to expand from 0.5m^3 to 1m^3. Calculate heat...

[b]1. Homework Statement A piston-cylinder device contains 0.05 m3 of water at 200kPa and 25ºC. The cross sectional area of the piston is 0.25 m2. Heat is now transferred to the water, causing part of it to evaporate and expand. When the volume reaches 0.2 m3 the piston reaches a linear...

I'm looking for a device I can use to measure analog voltage (up to 25V) and send the data to a PC via USB. Only really need one input, though it wouldn't hurt to have more. My main concern is that it needs to be pretty small and light - any ideas? The few I've seen online are either too...

The model is a vampyr 731i electronic I can't find the technical information online Howstuffworks.com only gives the information that the fan motor is electrical What sort of motor is used in the lead retraction device?

Homework Statement Four devices are connected in series across a voltage source of 120V. The total circuit current is 4.5A. One device fails to operate. The voltage across each of the other devices is 40V. What circuit fault is indicated and where? Homework Equations E=IR I=E/R...

hi guys i want to make a device consists of - a motor - stick (60 cm long, 0.4 Kg) - remote control - step motor to pull a rope -buttries the idea is the main motor rotates the stick for seconds or for a minute. and the step motor pulls the rope 360 or 720 degrees. and all these...

I've heard that frequency differences can cause the motor to rotate 17% slower than it normally would... UNLESS it is a universal motor. The device in question is listed as running on a universal motor, but is also listed as AC / 60hz only. Does this still apply? Thanks.

http://web.mit.edu/newsoffice/2009/braille-0821.html" MIT students develop device that could make labeling easier for the visually impaired. Product could be on the market next year. A device that started out as a class project last fall is moving rapidly toward becoming a commercial product...

I have a device I need made, but I don't know if there is enough information in the patent to have an engineer create it. Here is a link to the device...

I'm doing something that requires pressing my computer's mouse button once every 15 minutes so I'm trying to find something that will automatically do it for me whether I'm there or not. If anyone has seen that Simpsons episode where Homer uses the drinking bird to press the "Y" button on his...

Homework Statement Suppose that 2 identical photoelectric devices are connected to the same electrical circuit, and the devices are connected in parallel with each other. Compared to the voltage generated by a single device, the total voltage supplied by the parallel devices will be...

Hi Guys I am new engineering and would appreciate any advice or ideas on this project. I need to measure the height above sea level of a small vehicle that I am building.. My first idea was GPS, but the vehicle is going travel under a thick steel structure, so it will not work. I thought...

I am trying to figure out how to design a stair-climbing device similar to a hand-cart that climbs stairs. I know that the loading will be ~500 lb. It uses a 3-wheel climbing design design like http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_200381541_200381541" except...

Hi, time ago I found some Youtube videos and a website about this kind of device made of mirrors that invert the light coming from an object, and the effect (even if I don't remember precisely) should be to disrupt the sense of depth. This is a quickly made illustration of this device...

What is a smallest system which can be considered a 'measurement device' in terms of CI. How many atoms does it consist of?

I had a small, about 1 foot secondary tall tesla coil with about 3 inch leaders coming off the toroid, and when i turned it on, I had an LED bike blinker light that would turn on when I would turn on the tesla coil. The blinker was about a foot away from the coil. I was wondering if anyone...

Lets assume an Alien race that's 1.2 billion years ahead of human civilization in terms of technology. Do you think they'd be able to store the entire internet in one of their single device? If not, then how much storage do you think they'd have? Discuss..

Learning device, help me expound: on Faraday's choice of "ion", and "unionized" So I was writing down some notes to myself on electrochemistry (100 level college chemistry---elementary electrochemistry chapter) and I wrote down the word "unionized" (as in, 'un-ionized') and realized that there...

What are the major device ratings for a MOSFET?

Hi, I'm trying to model the frequency response of a thin PZT disc using COMSOL, but I am not sure how to calculate the impedance Z vs frequency. I defined the current density at the top electrode as I=-imag(nJ_smpz3d) and then plotted V/I using the domain plot parameters in the postproc menu...

hi I am doing my Electronics and Communication Engineering..I need a topic for paper presentation.Im more interested in semiconductor devices and device physics..It's like,i would like to address any physical limitation in the existing technology in reducing chip size.(this is the only topic i...

Is there anyone who knows of a tracking device small enough to install inside a notebook/laptop. Apart from RFID tags which only track within a given range. A GPS device that would track an asset as it were a car

Homework Statement Suppose you build a two-engine device with the exhaust energy output from one heat engine supplying the input energy for a second heat engine. We say that the two engines are running in series. Let e1 and e2 represent the efficiencies of the two engines. (a) The overall...

I was just curious what would happen if a device working at for example, 5 V DC voltage, is given 10 V peak to peak AC voltage. Would the device still operate? maybe it depends on the device but can someone briefly explain ..? thanks!

Hi Guys, :smile: I have heard of many energy saving devices available commercially, which when connected in parallel with the household mains, cause reduction in electricity bills. In smaller sizes they can be connected in parallel with any household power recepticle and cause reduction in...

Let's say there is a water based heating device that has 3/4" connection nipples. The pipe that leads to the device is 5/4". If one ignores pressure- and head loss, does it make any difference how far from the device the pipe reduces from 5/4" to 3/4" ?

ok the device used is called a “Instron” electromechanical testing machine. not sure if anyone is familiar with this, but that isn't the real point. ok, so an aluminum beam, dimensions: "ext. gauge length: 4in" "Spec. gauge length: 2in" "thickness: 0.037in" "width: 0.5in" now, the...

If one day we were to engineer a deep-brain stimulation device that would bring you happiness whenever you wanted it, how would the government try to regulate it, if at all? Do you think it will be priced at a pay-per-use rate (each time you activate it, it will cost you lots of $) or...

Capacitor AS an energy storing device help!? Homework Statement An air-filled parallel-plate capacitor has plate area A and plate separation d. The capacitor is connected to a battery that creates a constant voltage V. Question:find the energy U0 stored in the capacitor. Express your...

For a lab yesterday we recorded points to plot the I-V graphs for a few resistors and a light bulb. The light bulb was supposed to show that some that some devices don't obey ohms law but when plotting the graph I am cutting more of a straight line then a curve showing that it DOES! Could this...

Homework Statement A gas contained in a vertical frictionless piston-cylinder device. The piston has a mass of 4kg and a cross-sectional area of 35 cm^2. A compressed spring above the piston exerts a force of 60N on the piston. If the atmospheric pressure is 95kPa, determine the pressure...

Hi, can anyone help with advice on what basic device can i use to calulate power usage? the implementation I am looking at is follows mains socket -- device -- appliance its much like the product -> http://www.p3international.com/products/special/P4400/P4400-CE.html except i want to do...

When you have a current inrush from turning on a devise, does that mean there is actually less resistance for that brief amount of time?

Hi friends, I need your help about a subject in my mind for a few months. This will be a project for a course. I want to make a device which controls the lights in the room. I do not know if anybody made this before or not. Also this thing will be useful for homes. You do not need to turn on...

I have an ecofan that sits on top of my woodstove. It is powered by the thermo reaction between 2 metals, thus exciting electrons which then power the fan. Great device for moving air around the cabin. Living off the grid in rural Alaska, I'm in search of a larger device that could produce 12...

effect on Flow and pressure measuring due to turbulent flow of air Hi, I want to measure the air flow rate using a device which will basically measure the velocity of air and converts that in terms of flow rate reading. For creating flow of air i have used vacuum pumps which is connected by...

Hi guys, Background: There are 2 relays, A and B that needs to be controlled (24V) And a signal generating device that composes of a push button and an adjustable mechanism for timing delay between the 2 signals. (this is what I want to design) Specification: I want to design a...

Homework Statement see attachment Homework Equations The Attempt at a Solution I do not understand the diagram.

About a decade or so ago, I came across a website that featured a reactionless drive some guy built in his garage. My google-fu is weak, and I can't seem to find any info on it on the net anymore, and was hoping someone knew something about it. It worked as follows: There are two rings, set...

I think I am missing something in Schrodinger's Cat... Wouldn't the Geiger Counter cause the wave function of the decay to collapse because the Geiger Counter is interfering with the wave function? Would the Geiger Counter end the superposition of the particle? Does the problem lie with what the...

What is the device used to measure percent light absorption in pigments? I remember finding the percent light absorption in the pigments of some vegetables for a high school bio lab. I am pretty sure the device used was not specific for pigments. The device was user friendly- we just stuck...

My idea is to create a flotation device that would have a strong electromagnet at the top, this pulling objects upwards, just enough to cancel out gravity. A computer software will determine how much power to send to the electromagnet by knowing exactly how close the object is to the...