Device Definition and 531 Threads

I work in the electronics industry on radio communications specifically. The radios I maintain are not usually located at the facility in which they are used. Meaning the tramsmitters and receivers are located several miles from their respective operators, and the audio signals as well as the...

Hello, this is my first post. I googled it, and searched the forums, but no luck. I want to know what I need to build a device, that can light a small light bulb. Something rather small, such as a flashlight bulb. But I need the on/off switch to be a photocell that is sensitive enough to make...

Hey guys, I need to build a simple device that climbs a length of string (about 2 metres) without any support from above, and with energy from only the descend of a 200g mass. Speed is of importance. I have considered using two pieces of gears secured onto the string with rubber bands...

Homework Statement I need to find the temperature of the air in a sealed box after 15minutes, that has been cooled by a Peltier device. The set up is as follows: The peltier device is between 2 aluminium blocks of the same Area but depth of 1cm. The aluminium block that is receiving heat...

My semester project is to create a device that will make a sound at 5,10 15, and 20 seconds exactly using only gravitational energy. -My initial design used two rotating axles with two gears through them and a chain. It would begin by me dropping a weight attached to one of the axles making it...

So I briefly rested the side of my head on the back of my iPad. It had its magnetic smart cover attached, which has many small rare Earth permanent magnets (type of magnets unconfirmed). My head was rested near the speaker (having its own magnetic properties) and smart cover magnetic...

I have an assignment at college and my teacher has been bugging everyone for weeks telling us how we are not ready for the real world, i understand where he is coming from but id like to make something special as my last assignment just to show him that at least i am capable if not anyone else...

Hi, I am currently designing a stabilisation device for use in water. The general idea is using an inertial motion sensor to detect the orientation and propellors to correct it. I have very little knowledge in this area and was wondering whether I can use a phidget to achieve a wireless feedback...

as titled.

hello there... thanks for viewing my post. i need to think of a mechanical device that can transfer a payload to a through a tether and this device should lift up the payload and to a fixed place about 150 cm above the ground... well i am thinking about a spring attached to the device and...

There is this new electrical device called the Neo Socket Automotive Power Factor Corrector supposedly made by the Japanese company Miraizu that can be plugged into an automotive lighter's electrical socket which can increase the power factor of the AC electrical devices of a car. Power factor...

Hi I'm having problems identifying a component on a PCB and i was wondering if anyone here could shed some light on what this device is... http://db.tt/i1V3uqZf Anyhelp is appreciated Rgds Phil

Homework Statement In our phhysics class we are dropping an egg from 2 stories and we are given multiple restrictions inlcuding: No Parachutes. Length must not exceed 50cm in any direction. The design may not consist primarily of packing materials. Commercial packing materials may not...

Hey Everyone, I'm currently looking at designing a device that would allow people to escape from working at heights quickly and safely in the event of an emergency (up to 33 m) I know there are some products on the market already but since I don't have a great deal of experience with them...

Hi there! I'm working on a project that involves the operation of a variable speed drive controlling a motor. I'm wondering if it is possible to calculate the power usage of the motor if the rpm of the motor is known. I'm not very knowledgeable when it comes to matters electrical but I...

Hi, I'm a computer scientist w/ very little hardware experience. I've been playing with the idea of using NIRS for a brain computer interface. The basic principle is pretty simple: You have a laser diode and a detector that is 2-3 cm away from the diode. Unfortunately I have almost no...

hello, i found a patent in the internet where a device is presented in which a body is surrounded by water (especially if you scroll down on the 12th and 13th page in the document). www.google.com/patents/US7353554.pdf the author claims that the body is floating inside the device...

Hello all, Upon stumbling the forum during research I noticed some very helpful posts, and joined. This is my first post, to introduce myself I am an Manufacturing Engineering student with a large project on my hands and looking for sources of information. I have been given the task of...

Im watching some documentary on alien spaecraft, it was said that propulsion for one of these crafts would need an anti-gravity device. My first question is it even possible for an anti-gravity device to work according to the laws of physics. Second, if the field turned on you would need to...

I have a project that I am working on that has instructions as follows: 1. Nothing can be protruding form the can and the can must have a lid. 2. The the height of the can cannot exceed 2*d. 3. After the lid is shut on the can it must "tip/ flip" after 30 seconds. I have a mouse trap...

The voltage is large AC signal, not small AC. I never deal with this kind of biasing... I am doing some simulations to extract the impedance of the device. I heard about some ways to measure it, like load pull, S parameter. But I can't not do measurement now... The device is quit...

Hello, Chitose here It's been a while since last time I post my question. ...... I know that cloaking device is still impossible with today tech, but I wonder IF we can really create cloaking device and make someone invisible. my question is ... "Dose that person able to see a...

Forgive the title, I was unsure of how to briefly describe the problem. Attached are diagrams. Homework Statement The device shown in Figure P2.5 can be modeled as a current source in parallel with a resistance. When this device is connected to a 5[mA] current source, so that...

Is there any process or device that blocks EM waves of one phase (by any means, absorption, reflection, refraction, etc) but allows the transmission of EM waves of an alternate or opposite phase? Such that only waves of a certain phase can transmitted? Alternatively, are there any...

Greetings: I am currently in the research phase of a project. I would like to get some feedback, opinions, and supporting data/information concerning the feasibility of a small volume (less than 1 cubic meter) plasma container device that would ideally be used to store energy up to 100...

I am trying to construct a portable personal cooling device. I am considering using tygon tubing and propylene glycol/water mixture as the coolant in the tubing circulating it through an ice water bath. The tubing would be connected to copper pipes, that would run into the bag containing the ice...

Can anyone tell me how to wire a momentary normally open switch to a battery operated device (4 AA batteries) like this one? http://www.scientificsonline.com/mini-plasma-ball.html Is it even possible? Any advice appreciated!

Homework Statement We must build a self contained device which can pass through a standard doorway. It will start .5 metres from the egg cup with an egg in it this egg cup is then .5 metres from a cart that the egg has to pass through and continue going to a target on the other side of the...

Basically like a cellphone. I am aware that it is pointless, like most things in this life, but it makes sense if you want to learn about things. So I have a question Using knowledge on communication technology, and a bunch of old cellular phones, is it possible to combine all of that hardware...

Overunity Device Using Transformer -- Need HELP with theory Ok, so if you had a transformer with a single primary winding and multiple secondary windings - let's just say 10 secondary windings - what could you do with this? Say if all of these windings were 1:1 with the primary to the...

Hi, In designing and developing semiconductor/micro-electronic devices, what is the difference in research done between Physics, Mathematics and Electrical Engineering departments? Some Applied Mathematics departments work on numerical modelling and simulation of semiconductor devices...

Homework Statement The egg protecting device cannot slow down the natural descent of the egg in any form: The mechanism used to protect the egg cannot rely on buoyancy (i.e. no inflated balloon-based solutions) or air resistance (i.e. no parachutes or solutions designed to increase the air...

Homework Statement An MOS device has a following high-frequency C-V curve. The oxide thickness is 15nm. THe silicon doping is 3x10^17 cm^-3. Neglect interface charge. a) drawt the band diagram (include the gate electrode and gate oxide, label Fermi levels) at bias point where Vg=0 (point...

Does anyone have any suggestions on what device can measure sound frequency below 20 Hz? Thanks in advance for any suggestions

I just bout some wireless controlled wireless outlets. Theses are what I bought: http://www.menards.com/main/electrical/safety-security/timers/indoor-wireless-remote-outlets-3-pack/p-1477247.htm I want change how they draw power and the functionality. I am new to circuits and have a novice...

In Introduction to Mechanics by Kleppner, the section on Newton's third law says that the third law is not only a physical principle but is also a logical necessity for the first two laws to make sense. I don't quite get this. These statement precedes an experiment regarding an object in a...

Hello Physics Forum! There's an interesting experiment to verify the Stefan-Boltzmann law using an incandescent lamp. Which treats the filament as an approximate blackbody, approximates that the input power fully goes to the radiating channel (i.e. no conduction or gas loss), measures the...

Someone tells me that every objects has its own vibration, such as stone, water ... When bee is flying, the sound of vibration can be heard at different speed, bbbbbbb ... but not all vibration can be heard by us. Does anyone have any suggestions on what kinds of device can measure...

Hello. Im bilding a device. I have 1m vertical pipe with fan in the bottom and stepper motor at the top with sliding ping pong ball in it. (pipe d=45mm, ball d=40mm 2.7g) Stepper controls ping pong high in the pipe. The device is working but mehanics is not my aria at all so...

Disclaimer: I have zero electrical engineering/physics/math experience. In fact, I am a painting major. (Laugh it up) That said, I've been dreaming for quite some time of a very exacting music visualizer which would put all other music visualizers to shame, in that it would have a different...

Homework Statement A heat pipe is a simple device which can be used to transfer heat over considerable distances using only small temperature differences. It consists of a sealed tube filled with an appropriate fluid. The dryness fraction of the fluid is usually about 0.1. If the tube is...

Homework Statement The device consists of two rotating disks, separated by a distance of d = 0.879 m, and rotating with an angular speed of 96.1 rad/s. The bullet first passes through the left disk and then through the right disk. It is found that the angular displacement between the two...

I've been working on a multi-latteral project lately with afew of my collegues where our end goal is, free, wireless energy. The process is nearly complete and we hope to be able to broadcast this energy on a global scale, most of our technical issues have been worked out over the years but one...

I have a B. Sc. in Electrical Engineering and I would like to work with photovoltaics / solid state device physics. My undergraduate degree is not quite enough to let me work in that field outright. So I'm looking to do a graduate degree. I applied for a 2-year M. Sc. in Physics program and I...

I've got an IC device that I can't identify in my school kit. I've lost the parts list, so I can'tlook it up on there. Googling and searching on Mouser and Digikey is a dead end. I think it's a Hall Effect sensor, but without a datasheet I've no clue how to use it. It has three radial leads...

Hello, I'm not sure if this is the right forum for my question. If it's not, I am kindly requesting some assistance as to which website/forum to go to. Here's my question: I'm a sophomore and I'm trying to do a side engineering project to put on my resume and maybe eventually turn it...

I recently noticed that in Silvaco Atlas (device modeling software), the default bandgap of silicon is given as 1.08 eV. This is at 300 K, no bandgap narrowing, and no other secondary effects - it is default. However, most (all?) of the modern references (e.g. Sze, Streetman, Pierret) give the...

Please advise if the plastic white component mounted below the number plate on these motorcycles is or is not an Aerodynamic device that could afford an advantage at 100+ MPH over an identical motorcycle without this device? Users claim it is to keep dirt out of the hole in the bottom of the...

Does anyone know of a low cost "alarm device" that is triggered by a preset power amount? In other words, I need an alarm that goes off when an amount of volts or amps are present. I realize that there there are many things that I could do to inhibit the amount of current, however I would like...

Now, I'm not very well versed in the engineering side of telecommunications and what-not, so i was wondering if somebody could tell me what this was, I've exhausted all other options. It was glued to a window when my uncle moved into his apartment. The black box is the size of a matchbox...