What is Electronic: Definition and 441 Discussions

Electronic warfare (EW) is any action involving the use of the electromagnetic spectrum (EM spectrum) or directed energy to control the spectrum, attack an enemy, or impede enemy assaults. The purpose of electronic warfare is to deny the opponent the advantage of, and ensure friendly unimpeded access to, the EM spectrum. EW can be applied from air, sea, land, and/or space by manned and unmanned systems, and can target communication, radar, or other assets (military and civilian).

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  1. R

    Control and Feedback in electronic circuits

    I'm trying to understand the concept of a control system in electronics. In a control system, we have a substractor, forward path and feedback path. The forward path is described by a function g ( a gain function ) and the feedback by another function ( gain again ). The input is Xi and the...
  2. S

    Website for learning basic electronic

    guys, any suggestion website for study basic electronic?? thank you~
  3. B

    Inexpensive Electronic Propane Regulator

    First off, I'm not sure If the best place to post this would be in the ME or EE section. I'm basically looking for an inexpensive electronically controlled regulator. I want to hook it up to a standard propane tank that you would see on a grill and be able to control the output flow in...
  4. M

    Electronic Engineering requierements?.

    Hi people from Physics forums. This might be an off topic question but, since there are a lot of engineers and physicists here, i'll ask. What are the requirements for an electronics or electrical engineering major, can I be an engineer if I always sucked at math at school?. I've...
  5. Q

    Is my electronic textbook incorrect?

    Is it just me, but if you multiply anything by 100% you'll end up with the same number? I believe the authors meant to write 100, not 100%. This is from 5 steps to a 5 AP Chem. [PLAIN]http://i.min.us/icDcjc.png
  6. D

    Electronic Molecular Spectra - significance of band origin?

    Can anybody tell me the significance of the band origin for a P(Q)R structure in the ultraviolet region of a molecules spectrum? In standard vibrational spectra, I understand that its roughly the harmonic frequency of the oscillator, and that the rotational constant can also be found from...
  7. stevmg

    Are photons packets of electronic waves such as this below

    Are photons packets of electronic waves such as this below ----------\/\/\/\/\/\/\/\/\/-------------------------------------\/\/\/\/\/\/\/\/\/\/--------> Imagine the "------------------------->" line is an electronic beam.
  8. A

    What is a readable intro text for electronic materials (material science)?

    As the title, Anyone know any good readable intro book of material science, especially dealing with electronic materials(semiconductors,etc.)? I am a Physics major in sophomore year.. I took Calc 1-3, linear algebra, ODE and some intro EM and modern physics
  9. F

    Music Psychedelic Ambient Electronic music

    ttp://soundcloud.com/bedhead-1/sets/ambient/ Check out some of my new tracks and let me know what you think! : )
  10. N

    LV electronic ballast failures for halogen

    Hi, At my house i have in wall stair lights that are 20W halogens (x3). A week or so ago i switched on the 2 way switch from the bottom of the stairs and all three went at the same time. I thought it was the bulbs at first but quickly discovered they were fine. My next thought was the...
  11. X

    Effects of a Motor on sensitive electronic components

    Hey, my first post on here, just wanted to ask how to calculate the effect of a motor, and a switching current in the wires supplying the power on the surrounding electronics. The two motors will be supplied a PWM signal of 20Khz frequency, 5amp, 7v2 at 80% duty cycle. This is part of a...
  12. R

    Electronic project on knight rider

    i m making project on knight rider based on bread board using 6 leds, ic -555,4016 a decade counter, 3 variable resistance,and 1 potentiometer. the problem is that i don't know what's the meaning of knight rider, uses, applications .whenever i searched the net i have always found something...
  13. PainterGuy

    Electronic Principles by A. Malvino and David J Bates

    hi everyone, i want to know your reviews on this book. amazon has very good reviews. i am a beginner in electronic. was recommended by someone to get this book. would you recommend some other simple book? and how do you pronounce "Malvino"? my friend has Electronic Circuits, Analysis and...
  14. G

    Electronic people/tally counters

    Those of you who have worked retail may be familiar with the electronic counters stores install on doors to count the traffic entering and exiting the store. I'm working on a project to improve the quality of the shuttle system at my university. I want to measure all the important aspects of...
  15. GRB 080319B

    Electronic structure of states of matter

    Is there a defined change in the electron orbitals of atoms as they transition from one state to the next? Is there a connection between the average kinetic energy of an atom, its electronic structure and its state of matter?
  16. I

    Electronic properties of graphene

    I was reading all over the place that graphene has some really great electronic properties that could potentially replace silicon, electrons in graphene behave almost like massless particles etc. My question is, HOW did scientists find out these properties in graphene? What kind of experiments...
  17. F

    I don't want to get scammed by the electronic store

    Homework Statement A voltage - potential difference- is really just a measure of how badly electrons want to go from one terminal to the other. By connecting a wire, we create an E-field within that wire - the only path. Now my problem is, I used to think a battery - a source of voltage...
  18. P

    Engineering Civil engineering OR Electronic Engineering?

    Now it's my time to choose my major,I will choose from Civil Engeering and Electronic Engineering.In my university,Civil Engeering College is better than Electronic Engineering College,I may get a higher salary if I choose the previous one,but the work may be tougher(I may stay at a very remote...
  19. P

    Grain Size, Polarization & Resonance Frequency in Microwave Technology

    development of microwave technology enhanced the the used of ferroelectric materials. how to relate the growth of grain size with polarization and also effect on resonance frequency.
  20. F

    Electronic Instrument Amplifier

    Need some help guys https://www.physicsforums.com/attachment.php?attachmentid=32237&d=1297816285 I began to analyze it and I got to this: OA2 is a non inverting amplifer OA1 is a voltage follower thus: V1(1+ (R1/R2) is the input for R3 into the final op-amp OA3 which is an...
  21. N

    New Guy question about electronic component

    Hi hope someone could help me understand the workings of electronic components. I think I am right in saying that all electronic components require energy for them to function. If you connect a battery to the component to supply the energy then this is supplied from the electrochemical...
  22. H

    Designs for an electronic timer

    I'm conducting an experiment to determine the brachistochrone. The setup is going to involve an inverted cycloid shaped track about 5 or 6 feet long. I need a way to measure the time it takes for a marble to roll down the track and I need a more accurate method than manually operating a...
  23. J

    Mech Engineer, Electronic circuit noob

    Hi, I'm designing and building a mobile robot, however I have to find / design a circuit board that incorporates two motor outputs, and possibly 8-12 sensors. The circuit also has to be a PIC, to allow me to program the robot to carry out specific tasks autonomously. I have 0% knowledge on...
  24. P

    Term ground mean in an ELECTRONIC circuit?

    term "ground" mean in an ELECTRONIC circuit? What does the term "ground" mean in an ELECTRONIC circuit? A bus strip usually contains two columns: one for GROUND and one for a supply voltage. What does ground mean in this context and how do we ground a circuit while using a breadboard?
  25. M

    Electronic oscillator and negative feedback

    http://img707.imageshack.us/i/electronicsoscillator.jpg/ Dont know where to start for showing voltage difference at input is zero, suspose its something to do with non idealities of the op amp? For the oscillator question , kinda know how its works; there's positive saturation giving...
  26. T

    Best Electronic Technician Schools for Degrees

    Wich school is best to choose if you want to become electronic technician? Degree too? Thank you.
  27. C

    Resources on Electronic Packaging

    Hi, I will be volunteering my time helping my professor in the realm of "electronic packaging." There doesn't seem to be a lot of straightforward tutorials on electronic packaging, could anyone guide me with the proper resources so I can take a look? Thanks Carlo
  28. A

    Meaning of an electronic circuit will oscillate?

    i wonder if anyone can tell me the meaning of "The Barkhausen stability criterion is a condition to determine when an electronic circuit will oscillate." in this what is the meaning of an electronic circuit will oscillate? thanks
  29. T

    Correlation between electronic band structure of an atomic species

    Hii, I was wondering whether there is any correlation between the energy eigenvalues of a single atom (say He) with the electronic band structure of a collection of He atoms. for example, for He atoms the lowest energy would be the ground state, with 2 electrons. So will the lowest band for a...
  30. G

    Orbital energy and Electronic Configurations

    Hi I have questions related to the electronic configurations of elements of d and f-block. First I want to ask a question about the E.C. of Lanthanium. This element has E.C. [Xe]5d16s2, but according to Bohr-Bury rule 4f-orbitals should be filled prior to 5d-orbital and then Lanthanium’s E.C...
  31. A

    Electronic gradient of Schroedinger Equation

    Hi all. I have a question that I am thinking about for a couple of days. Let's consider the time-independent Schroedinger equation for a molecule: H0 [psi> = E0 [psi> Now, we know that the unperturbed Hamiltonian consist of electronic kinetic energy operator, electron-electron repulsion...
  32. C

    New open-shell molecular electronic structure program: What to do with it?

    Hello forum members, I got a nifty new multireference CI program at my hands and now I'm wondering what to do with it. The program is able to correlate general MCSCF wave functions, and as such basically any kind of molecular electronic structure imaginable; in particular also electronic...
  33. S

    Electronic Masking Research: Hypothesis Ideas

    so I am starting to work on research in electronic masking... What applications of this topic could I draw a hypothesis from? I'm having trouble finding a potential hypothesis/thesis topic. Thanks!
  34. G

    Do more energetic orbitals have wider bands in crystals?

    Let's consider we have a crystal and we search the energy relation of the bands as function of the reciprocal lattice vectors. We would do that theoretical by applying the Tight-binding method. Let's consider that each band is associated with some kind of orbital ( for instance, 3d orbitals). Is...
  35. K

    Simple electronic energy level question

    Homework Statement A certain laser outputs pure green light (photon energy 2.5 eV) with power 500 milliwatts (0.5 watts). How many photons per second does this laser emit? Homework Equations not exactly sure, I know that Watts are equal to Jouls/sec and that the electronic energy of a...
  36. C

    Simple electronic configuration question.

    Why is something like Fluorine written as 1s^{2}\;\;2s^{2}\;\;2p_{x}^{2}\;\;2p_{y}^{2}\;\;2p_{z}^{1} and not 1s^{2}\;\;2s^{2}\;\;2p_{x}^{2}\;\;2p_{y}^{1}\;\;2p_{z}^{2}? 2p_{y}^{1} and 2p_{z}^{1} should be of the same energy, right? Or is it only a matter of convenience/convention which one...
  37. S

    Electronic components consideration in mechanical design

    Hi all, I am fresh mechanical design engineer. I have some questions regarding the electrical components and wiring issues in mechanical design: (1) For an electromechanical system, how serious will motor influence the electronic components and wiring in terms of creating electromagnetic...
  38. H

    Work in Electronic Design/PCB Design from Home - Is It Possible?

    Hello... This is my last year in the field of electrical engineering and i want to work in electronic desgin or pcb design at home for some companies or some one... Is it possible to do so and if yes do anyone has emails or websites to contact these persons Thank you
  39. M

    Finding Resistance of an electronic component

    This may be a really dumb/easy question, but... I have a computer fan that I'm trying to repurpose. The specs on the fan say DC12V, 0.25A. I'm trying to model the fan in a circuit diagram because I want to 1) make sure i don't put too much current through it and 2) add a potentiometer to it...
  40. G

    What is purpose and diffrence between FADEC and Electronic ENgine COntrol ?

    Can anyone please explain me what is difference between Full Authority Digital Engine Control and ELectronic engine control in an aircraft gas turbine Engine ? What all parameters are controlled in EEC and FADEC ? What is the main difference ?
  41. X

    Electronic Projects Using Resistors, Diodes and Capacitors

    Homework Statement We've a task to make a electronic projects using only resistors,diodes and capacitors and a supply , what could we make out of these parts ?? The Attempt at a Solution I've searched over internet for 2 days and found 100 of projects but all of them are very...
  42. A

    Electronic Analog Computation for Sixth Form Students: A Project Guide

    Hello, I am a sixth form student studying physics and I am planning on doing a project on electronic analog computation and I am stuck as to where I should begin to learn how such a system solves problems (without delving too much into too many details). I have limited knowledge on electronics...
  43. R

    Electronic transitions for natrium atom

    Hi! I am writting my labbraport on electronspektrum for natrium atom. Here is my electronic transitions but the teacher says that there are some transitions missing...have no clue which ones they might be...can someone explain to me what is he talking about? which are the missing electronical...
  44. A

    Average electronic momentum in bound state: please see this

    Someone please tell me if I am thinking right: Let's consider an unperturbed electronic state of an atom/molecule. If we denote it by [a>, then the average electronic momentum in state [a> is, <p> = <a]p[a> = (<a]p<a])* (because p is hermitian) = (<a]*p*[a>*)...
  45. S

    Electronic packaging cost / price

    Hello, I am looking for recent info/studies on electronic packaging costs. I focus on the extreme cheap type of packages (e.g. SOT23). In general it nails it down to low I/O PLCC. A study on components sold in this type of package form is interesting too. Story on cheap LEDs interst me...
  46. A

    How to prove that for any bound electronic state, < p > = 0

    Hey all. So, I understand that every bound electronic state will have zero average electronic momentum, because otherwise the electron will fly off the atom. But how do I show mathematically that < p > = 0 for any bound state. Any help or reference greatly appreciated. Thanks.
  47. N

    Find electronic force, this one is driving me crazy,

    this one comes out of my homework question. I am not asking you guys helping me doing my homework, i had a thought but didn't work at all and i hope someone can tell me what is going on. question: Suppose the magnitude of the proton charge differs from the magnitude of the electron charge by...
  48. R

    Electronic Transitions: Energy, Spin & More

    1- upon getting sufficient energy, electrons make transitions in between their orbits. suppose an electron, from the first orbit, is provided energy that is enough for it to settle down some where between 3rd and 4th orbit, will it make an orbit of its own there if the source of energy does not...
  49. J

    Difference between electronic and digital

    I have seen most people say electronic dictionary, diary etc. I often confuses the terms. Since long time I have referred to my handheld Franklin dictionary as digital dictionary. Am I wrong?
  50. A

    Force or work for electronic transition?

    Hi all. This is my first post @ physics forum. For last two weeks I have been wondering about this problem: We all know that an atom or molecule subjected to a time-dependent perturbation makes electronic transition, and whether the transition is allowed or not depends on the transition moment...
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