Electronics Definition and 643 Threads

Greetings, I am new in this forum, but I have a question about Plasma televisions. I was told that they have an adverse effect on eyesight. Can anyone elaborate? I tried looking on www.altavista.com for Journals and Information on the medical aspect, but there is nothing but...

I'm very pleased to share this site containing many links to audio and video lectures in electronics and electrical engineering from educational institutions around the world such as MIT OpenCourseWare, UC Berkeley Webcast and NPTEL Courses...

Homework Statement http://img196.imageshack.us/img196/1295/40343374.png This is a past exam questions which I am doing as revision, now I am confused about how to calculate the answers. The Attempt at a Solution I have tried using millmans theorem which is Vsn = (Van/Za + Vbn/Zb +...

Homework Statement http://img265.imageshack.us/img265/8616/43354308.png I have an exam coming up in a few days and I am doing some revision questions from some past exams and this is one I have attempted but I have no solutions to check my answers. The Attempt at a Solution using Vs = 12cos(...

In a recently released computer game there is a scene where a nuclear bomb goes off in space over the active war zone on the east USA coast (too high for anything but EMP). Moments later, it starts raining helicopters and everything that uses electricity, from lights to laser sights goes out...

I've occasionally been asked by some of the students I've mentored or TA'd over the years, "What's in your toolbox? What do you recommend for someone who's just starting off to put in their toolbox?" I thought it might be fun / helpful to list some of your contents / essentials! In my...

i am a student of electronics and communication engineering. i am studying in third semester. i am eager to do some project related to filter circuits or any other things related to analog electronics and analog communication but i have no much idea about it. so, i want someone to assist me in...

I find a very good website that contains a collection of links to audio/video courses and lectures in electronics and electrical engineering from colleges/universities around the world. Site ...

I bought an Electrolux 30" gas range with IQ touch controls about 5 months ago. A couple of days ago, the clock display came up with missing segments and some half-on segments, and the oven light stopped coming on automatically when the door is opened. I told the controller to reset to factory...

Could someone please explain the basics of quantum electronics, as well as it's applications and involvement with semiconductor lasers?

I know this is probably in the wrong board, but. I'v just been looking into some Boolean algebra to convert truth tables into a set of logic gates representing a circuit. If i were attempting to represent a certain truth table, but i was limited to ONLY using NAND gates. (their the only...

I was originally going to take some electrical engineering courses along with my aerospace but have decided to just pursue it as a self study instead. I really just want to be able to do things at the hobby level. Could you recommend a good book or several books that would help get me started...

What is considered the best electronics books for physics undergrads who want to learn the basics of electronics? I would go and buy the art of electronics but many say that is more of a reference book than a textbook.

I have heard that a significant coronal mass ejection or solar storm can knock out the power grid. Can such an event damage all types of electronics making anything with a circuit board useless? Would motorcycles with magnetos still run? (I might ask this question in an electrical engineer...

The voltage regulator have 3 legs, 2 for input and one for output to make a constant voltage. I was wondering if this is possible? 2 x input of 12v and can the output be 24v or only under 12v? thanks

Solve this Electronics Mystery! Hey guys - I really need some help from you experts. My elderly mother and father-in-law have two electrical devices that are, for unexplained reasons, totally incompatible with each other. I need some ideas to identify solutions for this bizarre problem...

Hi guys, I need to find some textbooks which describe basic electronics. More precisely, I would like to learn 1) the components of a circuit (e.g. capacitor, diode, transistor) 2) how do these components work 3) The uses of these components 4) The standard appratus in a laboratory...

Hey! I am in the last year of my 5 year dual degree (which is B.E(Hons.)Electronics and Instrumentation with MSc(Hons)Physics ) from a highly reputed institute. I am currently doing intern at HP Global centre here in India , and I am yet to give GRE but I will be giving it in a two months...

Hey. As an upper level "lab" kindof class I am asked tot take either optics or electronics. To be honest, I wasn't a sucker for circuits in my other physics classes so instead I chose optics because I liked that part of my physics classes. However, would not choosing electronics put me behind...

Hello. I'm looking for electronics diagrams & schematics of very fist TOF mass spectrometers like the one of W.E.Stephens or Cameron's Ion Velocitron. These electronics equipements used vacuum tubes and present very interesting characteristics. If someone knows where I can find such schematics...

To star this post off, I would like to say that I am in not an expert in any field of physics but I do have an interest. So, my question is... Can the human body produce an EM field that is strong enough to affect electronic devices? Examples. computers- I'm pretty competent with them...

Homework Statement I'm unsure where to even start with this question so any help would be appreciated, thanks.

Hey, i am using one of these ICs to provide a 3.3V power supply from a li-ion battery. it works well but has an undervoltage lockout of 1.8v, much too low for a lithium ion battery. here is the datasheet: http://focus.ti.com/lit/ds/symlink/tps63000.pdf now it says on the pin descriptions...

Plz answer these questions. Need them urgently 1. How does Metro Rail work? The Electrical Description about how the Potential Difference is created? 2. What is the significance of direction of current? How is it found for AC Current? 3. How can you identify – live (or phase), Earth and...

When you drop an iphone or some similar electronic device into water, why does it stop working since it operates only at 5V? Water is not a good enough conductor to short out circuit that operates at 5V so how could it damage the device? Does the iphone LCD uses an inverter?

If you were in my place: 1. You want to pursue an undergraduate in electronics engineering degree (or a dual in mechanical and electrical?) 2. You were immature in high school, so now you need to get a high GPA in a community college in hopes to transfer to a university. (Social influences...

Hello, I am interested in tinkering with electronics and learning how to design / execute projects, and I thought I'd start out with a kit. I was wondering what kits, if any are recommended / of good use, and if you don't use them, where you recommend I find spare electronics parts for my...

Homework Statement Not really a homework problem. The problem is that while I was busy deriving the equations stated in my textbook about electronics, I get an inconsistency with the transfer equations relating to bandpass filters. The paragraph in my book (Electronic Instrumentation, P.P.L...

Hi, I am doing EEE at Adelaide University in Australia. I want to major in Micro-electronics. But all of my friends say it is better to major in Power Electronics as the mining industry is booming all over the world. Apparently it looks easier to get a job in mining. But i want to major in...

i have been looking for an electronics textbook for a while.i am an undergraduate student. already tried the popular millman & halkias.it stinks.can anyone mention the names of some "readable" textbooks?my syllabus covers topics like FET,multistage amplifier,oscillators, OPAMP,combinational &...

hi, I did my B.E. in electronics and communication. I am now working in a Software company for 2 years. I am interested in learning physics. How can i move about changing to physics field from electronics background. I am now refreshing my electronics and communication subjects. I would be...

Homework Statement I have made a picture af a circuit that you can see in the attachment. My teacher told me that at the points (A,C) and (B,D) the voltage (potential) is equal. Because of that there won't be a current between A and C and B and D (Ohm's formule) However, he has made an...

Homework Statement You have an op-amp circuit, a very simple one... All it is is a signal produced (triangle wave) from a generator that is sent into both the inverting and non inverting inputs. what does the output wave look like?? The Attempt at a Solution Im pretty sure this...

I've just read an article about IT with light instead of electrons: http://focus.aps.org/story/v22/st15 I wonder, is there any indication that light processing will be faster than conventional electronics? Information transport is faster, but what about logic operations? What would be...

hey my name is luna i need a help i have got work to do is how to design a common emitter amplifier with emitter resister and emitter bypass capacitor for the following: voltage gain= 70 lower cut off frequency = 135 Hz Take RL as 10k AND quiescent operating points , Vce = 6V and Ic = 2 mA...

Homework Statement If you were to generate a square wave with zero offset voltage using a function generater. What shape wave would the V out be if put through an opAmp?? The Attempt at a Solution For some reason this seems like an odd answer to me, because i want to say a sine...

somebody suggest me some good learning material for power electronics

Electronics / electrical engineering forums often get questions from novices who have trouble understanding the concepts of voltage and current. Invariably, a more knowledgeable person will explain it by giving the standard analogy between electricity and water: voltage <--> water pressure...

Hello. Any good resources which include general information about : 1- Bioelectric signals 2- Physiological transducers 3- Electrodes 4- Biopotential amplifiers for ECG (electrocardiograph),EEG(electroencephalograph),EOG (electro-oculograph).

Hello, Could anyone suggest me some good resource for the elementary electronics physics. Book name or really good link online I want to get the knowledge of electric current, potential, field..and so on Thanks!

Hi, I was looking around at graduate schools and was curious if anyone knew of places where they are doing research into organic electronics or organic photovoltaics? I found a research department at MIT and Stanford, but I was looking for something perhaps one tier below that. It...

I carry my cell phone and my ipod nano around with me literally everywhere I go. Both of them require charging about every other day. I have been thinking about upgrading to a more expensive ipod with video capabilities. But if I do upgrade, I think I would feel really guilty about my...

i'm designing a little project but I'm running into some environmental heat issues that I'm trying to work out. i just need a little clarification and insight from anyone willing. I have this box made of sheet steel that is going to be mounted to the side of a building. the box will...

Sorry if i change the subject somehow. I'm going to do postgraduate studies of medical electronics in germany, so does someone know which univeristies offer this sort of studying and its ranking.

After studying amplifiers and their operation, i suddenly realized today that i don't really know how they work at all. Assume Vcc = 6V for an NPN transistor, biased correctly to fluctuate about 3V In the Vout, once the DC part has been removed, how can the voltage possibly go lower than...

Hmm, how fundamentally important is this device? http://www.pcworld.com/businesscenter/article/145365/hp_researchers_build_intelligent_memory.html http://www.physorg.com/news128786808.html Sounds like it could enable electronics to obsolete us ;)

Nanoscale circuits based on molecules used in sunscreen lotion have led to the discovery of the "missing link" of electronics engineering – a previously mythical device known as a "memristor". First predicted in 1971, the memristor could help develop denser memory chips or even electronic...

Why does overshoot happen. For example in electronics, a square wave oscillating between 0-5V, overshoots 5V by a small margin. When the power supply can only supply a max of 5V, how can the signal overshoot. I guess the same goes for ground (signal going below zero).

I know this doesn't pertain so much to engineering but I figured you guys would know best. If you set the magnet next to a cell phone or TV, what kind of damage would be expected?

How are sine waves converted to current?? Im doing avionics in physics at the moment and we are talking about receivers... i now that the resonate oscilates at certain frequency and the antenna picks up the sine waves that are at the frequency... but how are they then turned into current...