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. Femme_physics

    Engineering Laplace plane basic electronic circuit (topic from control engineering)

    Homework Statement C = 4 μF L = 0.2 Hy E is DC current. No internal resistance. Write an expression the the laplace plane transfer function, that relates current (that flows through resistor R) to the voltage E. (There is another question. I will just address the first one for...
  2. P

    Electronic Oscillator: AC or DC Output?

    i have a wien bridge oscillator by using ±15V power supply. its output is sine wave. but i have a question. is the output become ac or still dc while it is oscillate with 10kHz?
  3. V

    Electrical & Electronic Engineering ( Health & Safety knowledge questions)

    Hey all I'm new to this site and I got to say after lurking around for a while and browsing this is a great site. I'm in my first year studying Electrical & Electronic Engineering and I got my heart towards getting into university to gain a HNC or HND. I have a lot of questions to answer (130...
  4. I

    Electronic Transitions in Protium vs. Deuterium

    What causes the differences between the atomic spectra of deuterium and the atomic spectra of protium? Are there any important considerations other than the difference in the spin of the nucleus? Also how exactly do the selection rules play out differently?
  5. B

    Elements with exceptional electronic configuration

    [b]1. Homework Statement [/b Some elements having exceptional electronic configuration have 2 shells having e not completely filled. Like Rh has configuration 4s2 4p6 4d8 5s2 now when we study how atoms combine we consider only the outermost shell because it is the only one not filled...
  6. B

    What to call a guy who designs and builds electronic circuits

    If I am a guy who develops CAD models, you call me CAD Engineer What to call a guy, when he designs and builds electronic circuits. I am looking for the word that is actually used in job search columns or newspapers, etc Just want to clear my (may be childish) doubt Regards
  7. N

    What is best software used to design electronic circuits?

    Hello everybody, Please i need a reliable software to use in electronic circuit design, and to check the circuit to be working before manufacturing,i mean not to make it, and then find that it doesn't work, so software to design and another to do analysis of the circuit, or one software do...
  8. C

    Engineering Thoughts on a second degree in Electronic Engineering

    Hi all, I am in the process of wrapping up my degree in Applied Physics with emphasis in electronics. The program has required me to take several courses from the electronic engineering department, which I have thoroughly enjoyed. I have done some planning, and it will take me one extra year...
  9. P

    Is it possible to use a laptop as electronic test equipment?

    I am part of a CubeSat team at my school, and one job that I'm currently tasked with is figuring out how to build a transmitting/receiving system that will fit into our satellite. As a result, I am wondering if anyone knows if there are any good, affordable devices that will let me basically...
  10. K

    Electronic to vibrational energy transfer

    Let's say I have some simple molecule excited to higher electronic level. Is it possible that it goes back to its ground state by transferring the excitation energy into its vibrational degrees of freedom? I believe it is... what are the selection rules for such a process? TIA
  11. T

    Non-Isolated Electronic tranformers w/UL approval?

    I’m looking at a project to make a electronic tranformer for use within a product, and driving its teathered external devices for a control system. I want to make the output AC voltage configurable between 24VAC and 120VAC. This can easily be done with PWM of the AC signal and a feedback path...
  12. W

    Electronic partition function for molecule with degeneracies

    Homework Statement A atom had a threefold degenerate ground level, a non degenerate electronically excited level at 3500 cm^-1(setting the energy orgin as the ground electronic state energy of the atom ) and a threefold degenerate level at 4700 cm^-1 . Calculate the electronic partition...
  13. H

    Searching for a 12v electronic switch

    New to the site, looking for a little help. I'm trying to switch my motorcycle auxillary lights on and off using the flash to pass switch. I have a relay but only stays on when powered. Is there a switch I can put inline, or a switching relay that will work. Thank you
  14. F

    Electronic devices operating voltage and current

    Hello Forum, Some electronic devices specify a certain specific voltage that they need to work properly. Some other devices specify a specific current... Why? Why don't they all specify the voltage or the current? If the current is specified, the voltage will be automatically fixed by...
  15. P

    I get shock when i touch my electronic equipments

    Hi all, i get shock when i touch any of my electronic equipments (washing machine etc). To avoid shock i need to remove the connection from the socket and then only i can do maintenance and put the connection back to the socket and operate. Obviously i think earthing is the problem before i...
  16. Femme_physics

    Engineering Electronic circuit with Op-Amp, Switch and Diodes

    Homework Statement http://img689.imageshack.us/img689/6668/mycircuit.jpg Given a circuit that includes Operational Amplifiers, double-switch - S, for two situations, 1 and 2. Type of switch - DPDT - Double pole double throw. Two diodes and two lightbulbs, L1 and L2. Given: Voltage...
  17. D

    Calculating VDS(off) for Electronic Converters

    Hello I'm trying to calculate VDS(off) for the buck, boost and inverting converter. All I have is Vin, Vout and duty cycle. Am I correct in thinking VDS(off) is the voltage across the FET? I have no idea how to calculate this. Thanks in advance.
  18. M

    Find latency and throughput for the electronic system

    ---a(x) ----[FIFO]----a(x)------> [SOURCE]-----a(xy)---> { } ----a(x).b---> [SINK] ---a(y)----[EXT]----b(1...n)----> In this system above, the source can generate one piece of data axy per clock cycle. A...
  19. Femme_physics

    How Can You Create a NOT Gate Using a NAND Gate?

    Basic Electronic Gates Question... Homework Statement Demonstrate, via a proper scheme, how can you realize a gate from type NOT, through a single gate from type NAND with two entries? The Attempt at a Solution http://img208.imageshack.us/img208/6093/image201202080001.jpg I got...
  20. K

    Two-state electronic paramagnet (DPPH). Calculate total Energy

    Homework Statement You have an ideal two-state paramagnet (DPPH) with mu=mu_B (bohr magneton). There is a magnetic field of strength 2.06T, and the minimum temperature was 2.2k. Calculate the total energy of the system as a fraction of its maximum possible value. Homework Equations from...
  21. N

    Help creating a electronic circuit

    I want to create a project which involves about 5 Peltier cooling units run off a battery. The problem is, I have no clue what type, or the specifications of the battery. The cooling units run between 0-15V and 0-9A. I want this circuit to be able to run at maximum capacity continuously...
  22. H

    Solid State Electronic Devices - Valence Electrons Question

    Homework Statement 2. Determine the concentration of valence electrons in doped (a) Si (a = 0.543 nm) (b) GaAs (a = 0.565 nm) Homework Equations ? The Attempt at a Solution This is the problem, I don't really know what they're looking for. I know what valence electrons are, but...
  23. M

    Need help about books from Electrical and Electronic engineers

    I want to know about books for undergraduate engineering level for three subjects; Linear Control Systems, Signal & Systems and Microprocessors. I have Modern Control Engineering by Ogata, S&S by Oppeinhum, Intel Processors by Barry B. Brey and Schaum's Oultines Microprocessors. I heard...
  24. S

    Path to audio electronic design

    I am 23 and have not been to college. I am currently working as a technician and panel builder for a small company that engineers and builds automation control systems. This is a decent job, but I feel underpaid due to lack of training, and want to step towards a field I'm personally...
  25. E

    Regions in the electronic band structure

    I'm thinking mainly within the context of the useful semiconductors here (Si, GaAs, etc.)... What does it mean for an electron to be in the L or X valley instead of the Gamma valley? If Gamma is the k = 0 point, then momentum p = 0. Does that mean being in L or X means all the electrons...
  26. M

    To determine the mass of a liquid using an electronic balance?

    how do you determine the mass of a liquid using an electronic balance ?:S Anyone knows how ?
  27. E

    LMTO - Creating Electronic Canonical bands of BCC lattice

    Hello, I need help with the Canonical band of BCC lattice (Linear Muffin Tin Orbitals method) I am trying to generate the Canonical (electronic) band for d-d orbital for BCC lattice; this can be done by diagonalizing the Structure constant matrix S(l,m,l',m'), (with l,m, l',m' being the...
  28. T

    Electronic Band Structure, Ionization Energy

    Hi, thanks for reading my questions. I've been reading and reading and reading and reading and I'm trying to understand the difference between conductors, semiconductors, and insulators at an atomic level. When reading about electricity I often find that metals have a "sea" of "free"...
  29. dlgoff

    Remembering Capacitance Electronic Disc (CED)

    The TMC channel is showing "Close Encounters of the Third Kind" which brings back the memory of RCAs Capacitance Electronic Disc. Anyone remember these? http://upload.wikimedia.org/wikipedia/en/thumb/e/ed/Ced_cart2.jpg/670px-Ced_cart2.jpg The first "video disk" I ever purchased/watched was:
  30. M

    Electronic Variable fan speed controller (design help)

    Evening gents, I am somewhat of a novice with electronics, but nonetheless am working on a temp. controlled computer fan but I've run into some trouble and need some help! My basic layout is a thermistor implemented as a voltage divider (with a resistor of course) which feeds into an amp...
  31. pairofstrings

    How to avoid electronic equipments getting destroyed from 'Nuclear EMP'?

    I think this is a super interesting question. I want to know if there is any way that we can protect our important electronic equipments from EMPs? If yes, how? Is the research still in progress and have we achieved any break through s in this area? I only know that it's very costly procedures...
  32. V

    Jj coupling scheme and electronic configuration

    Homework Statement Write all possible terms (n1 j1, n2 j2, …) J for these electronic configurations (considering jj coupling scheme): 1s2 1s2s 1s22s22p 1s22s22p5 The Attempt at a Solution 1s2 I have two electrons in the s sub-shell, since |l-s|<=j<=l+s then j1=1/2 and j2=1/2...
  33. AGNuke

    Electronic Configuration of Fe+

    Previously I had been asked the configuration for Fe+ as an ordinary question from Periodic Table. I know Fe2+ and Fe3+ but I have no idea for Fe+ I know the configuration of Fe : [Ar]4s23d6 So I accordingly wrote Fe+ as [Ar]4s13d6 But they say that Fe+ is [Ar]4s03d7 I just want...
  34. A

    Electronic Excitation: Absorbing and Re-emitting Photons

    What's happen when a molecule or an atom is already in an excited electronic state and is hit from another photon? Example 1: my molecule absorbs a VIS photon (there's a time in which the molecule is an upper electronic state before the re-emission or etc. etc. process) what happen if another...
  35. D

    Engineering Electronic circuit, LED turns on if Vin is greater than or less than a value

    Homework Statement Construct a circuit that turns on if it the voltage provided is greater than 3 volts, or less than 2. MUST USE THESE CRITERIA: i<100mA, only one PS. Fewer than ten components. Homework Equations None that I know of, but we've covered resistors, caps, inductors, and op amps...
  36. P

    What is a Subshell in Chemistry?

    Hello everybody, I am going to face an exam and I am learning Chemistry. I am confused with the term Subshell . Please explain what Subshell is .
  37. J

    Engineering Electronic engineering technology and signal processing

    hello I am in the final year of my electronics engineering technology program and I've really developed an interest in subjects such as analog and digital signal processing, filters, amplifiers, etc. are there jobs in these areas for people at my level? I've been doing some job searching and...
  38. S

    Exploring Energy Levels and Electron Configurations in Atomic Models

    Hello, why in the normal atomic configuration every layer except the second can contain only up to 8 electrons if for example the level with quantic number 3 contain up to 18 electrons? What relation is there between this two models? Thank you!
  39. S

    Thermostatic applied on electronic chip

    Hi everybody I am an electronic engineer and I have a question concerning thermostatic behaviour of an electronic component. I have a printed circuit board (PCB) with electronic chips on it. At room temperature 25°C I measure with the infrared themometer the case temperature of one...
  40. F

    Determine electronic transitions by the emitted wavelength?

    Homework Statement What is the electronic transition of He II when it emits 468.6 nm photon.Homework Equations \frac{1}{\lambda}=4R\left(\frac{1}{m^2}-\frac{1}{n^2}\right)The Attempt at a Solution I know it is a pashen-alpha line from googling but I don't know how to find that from this...
  41. A

    How to use electronic switches

    I'm pretty sure that one of the most common electronic switches is the transistor. That being said, I'm not very sure of how you can incorporate one into a circuit. Basically, what I'm asking is, how do I get it to switch when I want it to? How do I use a transistor?
  42. A

    Why do atoms emit discrete frequencies of light?

    Homework Statement Why are electronic levels present for an atom? What is the need for differentiating energy levels?
  43. N

    Electronic Signal and System problem: Ratio of signal energy

    Homework Statement x(t) is input into a perfect lowpass filter with frequency response H(ω), having a bandwidth of BHz and a passband gain of 1. For B = (2πT)-1 Hz, calculate the ratio of the output signal energy to the input signal energy. Homework Equations x(t) = Ae-|t|/T The...
  44. N

    Electronic Signal and System problem: Ratio of signal energy

    Homework Statement x(t) is input into a perfect lowpass filter with frequency response H(ω), having a bandwidth of BHz and a passband gain of 1. For B = (2πT)^-1 Hz, calculate the ratio of the output signal energy to the input signal energy. Homework Equations x(t) = Ae^-|t|/T The...
  45. J

    I'm a electronic engineering student.I need some help.hope

    Hi!I'm a electronic engineering student. I need some help. hope somebody can give me some hint or help! my final year project title is 'Wireless Temperature Monitoring System using FPGA board'. i really no idea how to start it!
  46. P

    What Types of Engineering to Build an Electronic Device?

    I want to start an electronic company, but I don't know what are all the types of engineering jobs that are capable to build an electronic device (Ex: Cell Phone, Tablet). When I get to University, I'm planning to make some friends who have a degree on it. Also, I need to know what the jobs...
  47. G

    Chance to help an Electronic Engineer find a weird material for an invention

    Hello. This is my first post here and I come shamelessly looking for help. I'm an Electronic Engineer and have an idea for an invention but do not know if the type of material that is needed exists, the only one I can think of so far is Bread dough. Anyway, what is needed is something...
  48. Femme_physics

    Electronic parallel voltage sources exercises?

    I'm trying to google for some but results often lead me to forum questions, theory articles, etc. Basically I'm looking for circuits questions with parallel voltage sources answers, where I am supposed to do the work to find out the solution for the current.
  49. D

    Kohn Sham, calculation of electronic density

    hi, in the Kohn-Sham-Scheme one calculates the electronic density as follows: \rho =2 \sum_{i=1}^{N/2} \phi^*_i \phi_i where the \phi are the Kohn-Sham orbitals. This looks like the density of a closed shell slater determinant. But am I correct, that this way of calculating the denisty is...
  50. H

    Electronic Eng. Technology and EE

    So at my school they have Electronic Engineering Technology & Electrical Engineering. However, the EET program is ABET accredited but the EE is not. They have the option of completing the EET degree then taking an additional 36 credits for the EE degree. So I'd have an ABET accredited degree...
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