Electronic Definition and 442 Threads

A "DIY" Electronic Speed Control ? is that viable? The concept of 3-stage brushless motors does seem very simple to me. Simply power the 3 different stages at different times, use 2 at the same time and the 3rd as a magnetic sensor. When the sensor goes on you flip the stages, one goes off and...

As I mentioned, I want to know if the cahrge distribution of nuclei has any influence on electronic properties. And what can cause a change on the nuclear charge distribution!

Does anyone know of a good code-oriented book on molecular electronic structure theory? I've been looking for a good modern book that teaches how to write SCF code to solve simple cases of the kind of problem that standard quantum chemistry packages (e.g. Gaussian, Orca) are used for without...

If i do an electronic engineering course , will i have enough skills to learn physics on my own ? by skills i mostly mean math , and most of all will it make me a better engineer ? i am really interested in physics , but i think my interest in computing , programming and software is greater...

I'am doing my undergrad first year in Electronics and communication engineering..I want to know what are all the practices which will make me a good electronics engineer...I usually like solving tough problems and I also try to learn the depth of my subject..If mathematical rigor is what makes...

Where can I learn EE online free (all the components, how to use them ect) in detail?

Homework Statement A photon emitted during an electronic transition in a hydrogen atom has a wavelength of 486.2 nm. From what initial energy level (ni) did the electron transition? Homework Equations Energy = hc/wavelength (h = Planck's constant; c is speed of light; and wavelength is 486.2...

Hello, I'm putting together a sort of electronic flute and I'd like to be able to use a sensor to control expression with breath. It needs to be small enough to bring up to the mouth to control, rather sensitive, and the cheaper the better. Any suggestions?

Homework Statement Which statement(s) is (are) FALSE in comparing the electronic transition from ni=5 to nf=2 in H with that of electronic transition from ni = 2 to nf = 5 in Be3+: a) The photon involved in the H transition lies in the visible spectrum while that involved in the Be3+...

what is intrinsically different about the light coming from electronic display screens vs the light everywhere else (light from the environment)? perhaps.. the brightness? but that shouldn't cause blurry vision. this deals with focuses.. anyone have any suggestions as to why this might be?

I bought some equipment for carrying out some electronics experiments- a cell, wires, an ammeter and a voltmeter. However the ammeter and voltmeter are AC meters, while the cell will provide DC current. Will this damage the meters if I connect them in the circuit?

Hello, I want to build transmitters and receivers and I wonder if there is a tool kit which contains components building these circuits such as VCO, crystal oscillators, low value capacitors and inductors etc etc with various transistors. Also is there a transmitter that I can buy which allows...

Sorry for my English. I write with the help of a translator from google. Please help determine what standards of a graphic symbol electric (number of the standard paragraph, the part number)? In one book in Russia were given 4 image transformer (for drawing in the U.S. and Europe). Аnd did...

I just watched a video by Koenigsegg engineers and came across this question. Why is camshaft the primary control of the engine valves? Using electronic controlled actuators would certainly benefit the engine in aspect of performance, but might increase the cost of production as well. People...

I have some questions based on the figures provided on this helpful educational link: http://chemed.chem.wisc.edu/chempaths/GenChem-Textbook/Orbitals-896.html == For discussion, let us work with two isotopes, He-3 (ppn) and Li-6 (pppnnn). Each (p+) would have an electron (e-) associated with...

Hi, I'm studying para-ferro/antiferro transitions, and I have a doubt: how can I know, starting with the electronic configuration of a given element, if it will have antiferromagnetic o ferromagnetic order? Obviously one has J>0 and the other J<0, but I don't see how it relates to the...

I am doing an undergraduate course in Electronics in India. My line of interest is in Electronic design. Can anyone kindly suggest me some part-time or full time courses in Electronic design and if possible the job potential too. Thanks in advance KRISHNA

I wonder what is the material is used to make an electronic chip? http://datasheet.seekic.com/ImageFile/MCP/Microchip_MCP4922-E_ST85280.jpg"]Image[/PLAIN] of an electronic chip. I also would like to know what is the material of the bottle of the coca cola soft drink? Is it pure silica glass...

Fix water-submerged electronic remote!??! I have an expensive (around $300) universal remote control that got water (I think? can't remember...some kind of beverage!) splashed on it about 2 years ago. When this happened, I immediately pulled the batteries and let it dry out for about a month...

Something really surprising, a electronic chip that will help to reduce eating. http://www.bbc.co.uk/news/health-21852062

Hello, I have come across this sentence in a paper: "For a metal, the introduction of a finite temperature T can be of a more technical use: the Fermi surface of the system is no longer a sharp feature in the Brillouin zone, and the number of electronic wave vectors "k points" needed to...

i know what it's supposed to do but what are it's electric components for an AC motor?

Hello Forum, I have heard of current operating devices, like LEDs, and voltage operated devices... What is the difference? It seems to me that all electronic devices, once provided a certain voltage, draw the current they need...so what is this distinction between current operating and...

When we try to predict electronic configurations by the building up principle we add electrons to the d-orbitals before the p-orbitals for principal quantum numbers n ≥ 4. What I don't understand is why, according to my textbook, we're supposed to remove electrons from np-orbitals first, then...

Homework Statement We got the following circuit: http://tinypic.com/view.php?pic=1zl7xg2&s=6 u_in is input u_ut is output The Attempt at a Solution I assumed that the upper amp has voltage u_in on the positive terminal. And that the lower amp has voltage 0 V on the...

Hi, I have a master of science degree in photonics. I wanted to pursue a career in photonics related fields. My major interests are in nonlinear optics,laser physics,fiber optics and material science. I have received an offer for PhD in electrical engineering(micro-systems and photonics...

Homework Statement Hi all. This isn't homework per say, more lack of understanding of something when reading around the notes.My problem is in trying to derive the electronic specific heat constant γ in 2 dimensions. Homework Equations I know the general formula for specific heat is c^{el}...

An element with the following electronic configuration: [Ar]3d3 4s2 a) what. Does it belong to? Period 4 b) what is its group number? Group 5 c) what kind of element is it? Transition metal d) how many of how electrons are there in an atom of this element? 3 2. what atom has this...

I'm in the opening stages of a project, part of which is building an FM Radio transmitter. I am using the circuit found here (call it site1), which is the original of the circuit found here (site2). On site2 is a method of making the inductors required (5 turn air coil, 4mm inner diameter...

I am interested in how to protect electronics circuit in hazard areas Are there special ways of soldering /circuit arranging for highly vibrational places ? moist/water protection ? Impact ? Hi temperature ? Special box materials for examples above? etc... tnx ;D

i am looking to build a device that can communicate with a phone and through that phone you could turn on or off a light or a siren with fairly long range 20 to 30 meters (60 to 90 feet). Would anyone be able to help regarding this device. I am looking for it be as small as possible. also i...

the energies of light quanta increase gradually as the color of light changes. Of the following metals, which has the largest energy change: sodium, barium, calcium, strontium, lithium, potassium, and copper (ll) I need this within half an hour :cry: I'm guessing it has something...

Homework Statement The first vibrational band in the absorption spectrum of H2CO is at 28871 cm-1. The first two bands in the emission spectrum (from v'=0 level) lie at 27021 cm-1 and 24687 cm-1. Explain these observations. Determine the band origin of the electronic transition and the...

Hi In introductory atomic physics one usually goes through the classical derivation of the Zeeman effect, where one finds that an electron in a magnetic field can have three different kinds of motion: along the B-field with frequency ω and rotating CW/CCW with ω±Ω. Polarized photons can...

Hi! Can anyone help me out with ascertaining how to go about preparing for a course in Electronic Printing and Media technology from a reputed International university? I understand that the recent developments in this field have been unparalleled (they have just fabricated paper-thin...

Homework Statement You're given an electronic switch which requires 5V at 1mA in order to close; it is open with no voltage present at its input. If the only microphone available produces a peak voltage of 250mV, design a circuit which will energize the switch when someone speaks into the...

When you need a component (ex. SCR) with specific requirements (ex. 12amp max and less than 20mA gate trigger current) how do you go about finding the component? How do you know what's out there for purchase in extremely small quantities (like just a few). This always becomes a problem when I am...

I am trying to self-learn quantum mechanics pertaining to Lanthanide ions. For a given set of J and MJ quantum numbers in a valence 4f^2 electronic configuration, J=0,2,4,6 and MJ=0,6,-6. The |J,MJ> basis functions are |0,0>, |2,0>, |4,0>, 1/2[|6,6>+|6,-6>]+sqrt(1/2)|6,0>, and...

Hi i work at mission central tearing down computers and other electronics plus i look for electronics at the curb that people threw out. I was wondering if i can make a wire strippers that will strip many size wire and also feed it through by itself or with a little help. I want to make it with...

The mass of the pendulum bob was determined on an electronic scale and its diamter was measured using calipers. The initial height was measured with a meter stick. At the lowest point of its swing, the pendulum bob broke a photogate light beam. The time interval that the light was interrupted...

Hello, I thought I'd run this past you guys. My wife wants to start making LED trees for outside use. I have been running a part time solar power business, but all my stuff comes assembled to a degree. I have no idea how electrical code might come into play regarding electrical...

Hi guys, my final theoretical electronics class is tomorrow. :) I want to thank everyone who helped me solve all my questions, especially I Like Serena, Nascent Oxygen, ehild, jim hardy, Studiot, gneill, Quabache... as well as CWatters, vk6kro, yungman, Kholdstare, sophiecentaur , technician...

greetings, how a inductor and capacitor can perform differentiation and integration respectively? any help would be appreciated .

Transisiton metal electronic structure question. :) Hey guys, basically I know that Chromium and Copper "donate" one of their electrons from the 4s sub-shell to the 3d sub-shell. Is this true for ALL transition metals? Any help would be greatly appreciated. :)

Electronic Structure question? :) Hey guys essentially in my GCSE Chem class we were told that the maximum number of electrons that can be held in the first four shells are as follows - 2,8,8,2. Now in my AS Level textbook it is saying that it goes 2,8,18,32. Can someone please explain to me...

Being an electronic engineering,i want to pursue graduate study in physics after my graduation in electronic engineering.I'm interested in experimental particle physics/accelerator physics,but there is a thing,we have to choose a option to specialize in final year(e.g optoelectronic/signal and...

Hi, I need a little help trying to determine the possibility of incorporating touch and motion sensor technology in material like rubber, plastic or glass. My question is as follows: Is it possible to incorporate touch and motion sensor technology in material like rubber, plastic or glass...

With an ESC powering a brushless motor, does the ESC get power feedback? Sorry I don't know the terminology, so I'll ask it a couple of ways. The power from the esc runs through a big length of wire windings. I get this isn't a short circuit since enough of the power is turn into heat, does the...

I just thought Id post some of my thoughts on what I feel is needed for undergrad physics majors who are interested in the more practical side of what we are learning in our highly idealized and theoretical coursework. I also would like to point out what tools I think are necessary for people...

As we know the contactor in power circuit make spark when it open and so its contacts may damage and aging Is it possible to replaace the contactor by power electronics switches such as MOSFET TRIAC and IGBT? Any help will be appreciated