Electronics Definition and 631 Threads

hi, so i want to be able to run a motor depending on whether or not an IR detector senses IR light. so the basic idea at the start was to connect the motor with the detector and a resistor in series and therefore if there is IR the current will flow turning on the motor. I then learned that the...

hi, my name is suli, 16 year old from living in the U.S. I want to one day become as decent an engineer as i can, i hope that this site will help me learn more about the rules that govern the universe. i am especially interested in electronics, maybe its because of iron man ? dunno... well...

Hi all, I am an electrical engineer and feel I should know this (embarrassing!), but I for the life of me still can't quite get this concept. I understand conceptually the idea behind a pull up or a pull down, in that we want the IC to read a high state, by defaultm in the case of a pull up...

Can you please explain to me this statement The farther an electron is from the nucleus, the higher is the energy state, and any electron that has left its parent atom has a higher energy state than any electron in the atomic structure. And is the meaning of electron state.

Basically I want to test my analog circuit using a forcing function that has a form of a delta function. The function generator I use outputs sine wave, triangular wave and square wave (+ve and -ve output in one period). Are there any ways to produce a square wave that has an output for like 5%...

I'm a mechatronics engineering student, and I know that electronics is a requirement in most engineering programs. I'm been dealing with electronics recently and I've been studying electric circuits. I've been noticing that in some of them instead of being closed (in diagrams) they are like...

I'm trying to build a circuit to solve the differential equation x''+2x'+x = f(t), where f(t) is a sine wave with frequency 5Hz and amplitude 0.5V. I am supposed to get a sine/cosine wave (as the diff. eq is just the same as the ove governing spring-mass forced oscillation) as solution, but...

I know how to derive the expression Vout = -CR*d(Vin)/dt for a circuit differentiator that consists of a capacitor and a resistor, how I can understand the attached circuit, which is part of practice exercise for my class. Why do we need to add R2 and R3? When I run the simulation Vout =...

Odd question, would anybody know what would happen if a parallel plate capacitor (good conductor) had a soft magnetic material (fairly poor conductor) as a dielectric? What would be the DC/AC electrical characteristics of this?

I'm in a digital electronics course studying memories and latches and flip flops and need some good books I can study from them

Rb=40 ohms RL=100 ohms Vcc=15V I need help in figuring this problem out, I understand if anyone here doesn't want to give me the answer but I would appreciate if someone would give me a formula in which I could solve the problem myself.

they have different names or something else?

HI everyone. I'm an engineering strudent, looking for online material with exercises on diodes...anyone can send me a link here with explanations of the various exercises? Thank you very much :)

So, recently I started learning about electronic components and then I started learning about semiconductors. The one which I've been having some real trouble to understand its function is the transistor. So I bought an electronics textbook called El ABC de La Electrónica (The ABC of Electronics...

Am a Physics undergraduate student; I need project topics based on Geophysics or Remote Sensing or Electronics

Let me start by saying that the point of this question is to figure out if I can do this with items on hand instead of buying a UPS. I have a cable modem and wireless router which require 12V 750mA and 12V 1000mA respectively. In the event of a power outage, I'd like to be able to manually...

Hey everybody, I'm from Argentina and going to college soon. I'm stuck between physics (mainly for contributing to interstellar travel) and electronics engineering. The thing is, I'd only study physics if there's a slight chance of witnessing warp drive/wormhole technologies in this lifetime...

Well, recently I have started to deal with electronics and I've seen several new concepts such as ohm's law, parallel and series circuits, what's AC and DC and many other topics. Ok, I have no doubt on what's direct and alternate current or what a series and parallel circuits are; rather than...

Hi.i know that a ideal current source has infinite resistance and it supply's constant current to aload connected across it. The current source doesn't have the infinite resistance in series to it but in pparalle. All is well until I think of this Norton's Therom. When we transform a voltage...

First post in the forums. Looking forward to some great conversations. I took my ultimate exam for an A.A.S. in Instrumentation Technology, Electronics, and Bio-medical Equipment Repair Technology. I have an internship at a hospital SUPPOSEDLY scheduled to start in a month. I have plans to...

I'm having difficulty grasping digital circuits. I'm not even sure how to think of it.. For eg. In analog electronics when it comes to transistors I can clearly and perfectly visualize how current amplification or power amplification occurs. To further elaborate my problem,, I recently learned...

Homework Statement http://postimg.org/image/hf6zpmykr/ Homework Equations intrinsic carrier density = ni = 10^10/cm^3 (for Si at 300K) The Attempt at a Solution Its a really elementary problem but I can't figure out the difference between some quantities. For example, free electrons and holes...

I read somewhere (article, messageboard, i can't find it anymore) that motherboard bus speeds are limited because if the frequency gets too high then the signal will disappear. I guess I understood it to mean that the bus wire will become like and antenna if the frequency is too high. They...

Hello, I am new to electronics and am having trouble understanding this formula for capacitance: Could someone please break this down into layman terms? Interestingly π appears? I'd like to understand why that exists in capacitance. Thank you all in advance!

i have deep interest in electrical and electronics components since i am small. so , i am thinking of studying E&E engineering. but , i have very little exposure to this field. Can someone share what the E&E guys do?

I'm in EE, and it seems that around my department, a huge majority of my fellow students spend a lot of their free time doing hobby projects with microcontrollers (mostly arduino and raspberry pi). I suppose that if I was doing something interesting with them, then I could enjoy it, but I've...

So I am a 17 years old student who is interested in electronics and programming them (I am expirienced with Arduino). I and my friends decided that we will join a competition for all technical schools in my country. The goal of the competition is to make a project that will do something while it...

The question I've been given this question by a teacher and I'm clueless as to what b) and c) are. Could you please help? I would really appreciate it. The prize is a place to see a lecture on quantum simulation at our local University. Thank you :)

I come across a number of electronic circuits - simple ones - in my studies as an undergrad student in Applied Physics. But I often wonder: the circuits that we are taught about are all run under idealised conditions. Even during practical demonstrations and labs, we run them with function...

Hi, I'm a freshman in college and a beginner in electronics. Does anyone know of a way to use a micro analog thermometer to change the color of a small LED light once it hits a certain temperature. I am looking to make this on an extremely small scale.

As we know that in a metal-semiconductor junction schottky barrier arise. My question is that this is generally represented as sudden discontinuous jump in energies of conduction band on either side. But this will mean that the electric field at that point is infinite since electric field is...

I'm currently reading a paper given to me by my professor to expose to class. The problem is that I don't understand it very well! I'd like to see if you guys can help me. The paper I'm reading is "A boost dc-ac converter: Analysis, design, and experimentation" I've found the paper on the...

I have recently taken apart a few old DVD drives to see if there were any stepper motors available for a Raspberry Pi project I am currently working on. When I opened one of the older drives I found a motor which was unlike the others as it only seemed to have two wires going directly to the...

A bulb in a staircase has two switches , one at the ground floor and the other one at the first floor. The bulb can be turn ON and also OFF by any of the two switches irrespective of the state of the other switches, then what is the logic of switching of the bulbs

Forgive me for asking this question if the answer is obvious. The truth is I have a BENG in electrical engineering and want to know the differences between the two. From an engineer's perspective its about knowing what you can do with the devices in a useful way and design, analyze and build the...

Hello all, I was dreadful at circuits and am now suffering in Electronics. It is almost as though I have trouble looking at them from the perspective of what I have to do when presented with a problem. I sort of freeze. It doesn't help that my professor is conversational in tone without a lot of...

I am taking an introductory course on electronics and I have a test coming up next week. My professor likes to give very challenging and long problems on tests. Are there any resources that have particularly challenging electronics problems to practice with? Thanks!

I need help in creating a weighted timing controller that uses 4-bit DIP switch (Weight), 1-bit DIP switch (Fast/Slow operation) and etc. The question is shown below. Creating a Weighted Timing Controller: A simple microwave oven has two cooking modes: a "Slow cooking" mode that operates on...

hello everybody, I will Study Engineering and I'm thinking to take your opinions in the major that i will study I'm Confused between communication and electronics engineering, mechanical engineering or civil engineering. I care about the job-market which one is the most requested ? . which...

Why do we need a two port network? Is there something which a one port network lacks? Why we needed a two port network connection?

Is it possible to study quantum mechanics at post graduate level(M.S.) after a Bachelors degree(B.Tech) in electrical and electronics engineering? The reason I am asking this is in India, my locality lacks good science schools. So, I thought of doing my bachelors in EEE and then take up masters...

Hi. I am very much interested in physics but my locality lacks good college for undergraduate physics but has good engineering colleges. I was thinking of taking up electrical and electronics engineering hoping that it is related to physics. I need advice if I can take up particle physics or...

Newbie looking for guidance -- How start learning electronics? I know this is going to sound strange... but I am the biggest newbie you guys will ever see :) I don't know the first thing about math, science, physics, etc. Actually going through school I actually got kicked out because I just...

Hello PF, I am currently in an Analog Electronics course that comes with a lab. We use Art of Electronics (AoE) by Horowitz and Hill as our textbook, but after reading through it, I'm starting to feel that it's not as suited for a Physics course as it is for say, an Electrical Engineering...

As my hobby, I'm working on a robot. I've got the electronics mostly done, and it works. Programming is not a problem, since I'm a professional developer. What's got me stumped is housing the PCB boards. I've look at some products online, but I can't seem to find anything that would allow me...

There are a lot of electronics kits available. Lego has a couple and there are things like the arduino, the PIC, etc. Which kit should I use that looks best on my resume? I should probably avoid Lego products as those might appear as toys.

Hi, So I was thinking of purchasing an electronics toolkit, but I need recommendations. I'm looking to prepare for a second year physics lab (although my main reason in wanting to purchase a electronics toolkit is interest). So my own research lead me to...

Homework Statement Figures 1 (a), (b), and (c) show low-pass, bandpass, and high-pass filters. Write the transfer function H(ω) for each of these filters, showing the ratio Vout/Vin as a function of the angular frequency ω of the input voltage. -The low-pass filter calculations...

Homework Statement http://imgur.com/w5AQ1A8 As shown in the image: In the circuit below R1=100Ω, R2=1000Ω, R3=99Ω, R4=1000Ω, R5=10Ω, and V=10V. (a) Relying on the Thevenin theorem, find the equivalent voltage and equivalent resistance for the circuit below when the resistor R5 is taken out...

Homework Statement http://imgur.com/OowiMCR As noted in the image: In the circuit below, R1=R2=10kΩ, and C=0.1μF. Plot Vout(t) if the input, Vin, is a step function of height V0 at t=0 Homework Equations Vcap=V0-Ce-t/RC The Attempt at a Solution I was hoping someone could...