Feedback Definition and 251 Threads

One of the key factors in determining the climate sensitivity to the increasing atmospheric concentration of CO2 and other long lived greenhouse gases is the response of water vapor to the relatively small warming induced by these gases. Climate models produce a strong signal of positive water...

Hello all I have come across a circuit of a standard differential amplifier with an integrator in one of the feedback paths. I have no idea what its function is. I suppose some sort of frequency gain discrimination Any ideas? Matheinste

Hey, 1. Homework Statement . I wrote my own proof for the below, I was wondering if you guys could take a look at it and give me some feedback please. Particularly, I would like to know if this proof is rigorous enough. Lemma 2.4 - Suppose f has a second derivative everywhere, and that...

Hey, I have the following standard feedback system: http://img112.imageshack.us/img112/7152/feedbacksystemuq5.jpg This shows the Z-Transform where: A(z) is the z transform for input a[n] and C(z) is the z-transform of the system's output c[n]...

Please if you are willing to help give me feedback and check for mistakes, post ! I have three essays to do in the next 2 weeks or so. The first is about the New Deal The second essay is a philosophy essay the third essay is about media and how it affects us Thanks in advance !

Hello Chaps, I have been thinking about for a bit and the texts i have are quite vague on the topic. I'd like to know what monitoring devices are used for the control rods. I would have to assume that power output or neutron detection is used for this purpose? Cheers, Rhys

Hi everyone, I have a small MATLAB problem which arose while trying to solve a full state feedback problem in control theory. I have a system in state variable form \dot{x} = Ax + Bu y = Cx where u = -Kx, so the system reduces to \dot{x} = (A-BK)x The solution is x(t) =...

http://sales.hamamatsu.com/assets/applications/SSD/si_pd_circuit_examples.pdf The picture 5. Usually, how much the feedback resistance to use? 100u ohms?? or, how do we know how much resistance to use? thank you.

Hi there. I'm wondering if anyone can help. I've got a few past papers I'm working on at the moment and there are a few questions I don't even know where to start with. Here's one: a. Write down the transfer function for a time delay and then evaluate its corresponding frequency response...

Hi For our control systems project, we are trying to implement a closed feedback image focusing system. A digital camera captures the image of an object (a checkerboard), sends it to a computer algorithm which determines the amount of defocus in it and sends an actuation signal to a stepper...

If I have a simple TTL NOT gate and had a feedback line from the output to the input, then how would I explain what happens to the output voltage for certain inputs? Does it just simply oscillate continuously?

Can someone read over my resume. Thank You Here is the file. I uploaded it this site, because I don't know when an Admin will ok the file. http://www.badongo.com/file/7507007 I replaced a lot of the names with generic stuff since this is a public form. Couple of things that I was unsure...

Hi guys, i am taking a module on feedback control systems this semester and i was wondering if anyone has any good recommendations of textbooks. Thanks guys. Marcus.

Hi I just have a quick question for a feedback potentiometer circuit what is the purpose of the resistor R25? Please see circuit diagram below (attach) Thx a lot Fta_25

I'm not sure how many of you are musicians, so i'll preface my post with a bit of background. There are a number of products on the market for the electric guitar which produce artificial feedback. They basically consist of a pickup, gain stage and magnetic driver. The idea is the device will...

"black hole the video". see what you think. go to a google video window. video feedback loop shows a black hole in real time. is the center rotation dark matter?

Hey guys...i've had some ideas floating around in my head for a while, but really don't have anyone to talk to about them. quick intro first. I'm 24, i don't have a degree in any related field, and I am sure I am not as intellegent as most people on here...so I am a little intimidated. I've...

What causes the feedback (a noise increasing in intensity and pitch) sometimes heard when people speak through microphones? I'm sure I have enough background to understand an explanation, I've just never thought about it before.

I am interested in building a rocket with feedback control system... so I have been interested in model rocketry lately and I was wondering how feasible it would be to design and build a model rocket for my senior project complete with a control system to ensure it flies straight up. I was...

everyone loves these things but i can't get my head around it... any explanations seem to go from blindingly simple to technical very quickly... i understand logic comparators but as soon as negative feedback is included i get all confuzzled. OK so i understand that the output will become...

In the other thread we / errm I discussed that theories cannot be proven but they can be falsified. Actually, without positive feedback, more CO2 is merely a mild friendly climate alleviator at the most So the issue here is the positive feedback factor of CO2 on the termination of ice...

Hope someone might be able to help, if you look at the circuit attached. Why is the feedback of resistor and cap not being fed to ground? What purpose does this serve. I was thinking its probably to filter out unwanted high frequencies but unsure?? Thanks

Hi, Suppose I have an amplifier with feedback, how would I measure the input and output resistances (using instruments)? If the input of the amplifier is a voltage source, the input resistance would simply be V(signal) / I(signal). Now if the output of the amplifier is a current, would I...

Edit: Electrostatics/Electroscope Correct Answers Feedback I have the multiple choice part of my electrostatics test back and I'll be sure to update the other thread once I get that part up:smile: 1.*When electrons are transferred from one object to another, positive and negative charges...

Homework Statement I have some problems determining the tension output value for this circuit and this confusion comes from the presence of positive feedback and an alternate current.Since I'm used to negative feedback circuits and direct current it confuses me a bit,so any help is deeply...

I was wondering,how does positive feedback works in opamp circuits?Like is there any formula for calculating positive feedback?I know that with negative feedback we have Vp=Vn but I don't know how it works with positive feedback!Thanks for the reply!

Homework Statement A 98.6 kg box is resting on a horizontal surface. The coefficients of friction are uk= .1602 and us= .6027 for the surface to box. The box is attached to a 59.1 kg rock by a cord that passes over a frictionless pulley. What is the acceleration of the 59.1 kg mass? Make...

Hi, i was reading through the topic on analogue electronics. And every single example on my text seems to just be just on the negative feedback on both the inverting and non-inverting input of an op-amp. What i would like to know is what's the difference between positive and negative feedback on...

Hi I'm a video artist, interested in philosophical aspects of science (also beeing on 5th year of electronics course at Gdansk University of Technology). I would like to invite you, the understanding part of population, to watch my latest production, called spectrum...

hey guys. attached is a negative feedback system. This is used to control the system and maintain stability. But something doesn't make sense to me. If you look at the diagram, when the output is y(t)=4sint (as required) then the feedback signal becomes f(t)=2sint, but that means that the...

I have had this idea in my head for years and I want to know once and for all if it will work or not. I understand that a flywheel gains in mass when it spins. If this is true, is my thinking below correct? Any feedback would be appreciated! Inertial Mass Propulsion: I am going to try to...

First I'd like to start off by saying if the descriptions used the following rant describe YOU, I'm sorry, but it's very annoying and unprofessional. Why is it that eBayers don't leave prompt feedback? I only have a few feedback points but I'm sick of being cheated out of reputation points...

This website was made (very hastily) for a recent FBLA web development competition. The goal of the website is to attract businesses to your city (real or make-believe, in this case the city is real). I would appreciate any feedback and constructive criticism. Thanks in advance...

I'm having a problem setting up a certain differential equation which I need to solve a problem. Here's the problem: I'm given a feedback control for a certain metabolic pathway. I've attached a picture of the network below. Now what I can't figure out is how to write the differential...

i don't have the basic of analog, but i tried to look for in the books. unfortunately, the books are using voltage divider biasing instead of feedback biasing. i have a circuit like this: http://www.mrnerdy.com/forum_img/BJTampfeedbackbiase.jpg would anyone tell me the flow of the current in...

i have a flat box in which i put a spinning beam hold by the center i putweights on the beam that can run longitudinally on the beam so when the beam spins the centrifugal force send them away from the center i tight a cable to a corner of the box and the weights in such a way that when...

Hi, I want to know how the Insulin/Glucagon hormones act as negative feedback. Blood sugar goes up, insulin is created, blood sugar goes down, glucagon is created, blood sugar goes up again, and they basically compete with each other to maintain homeostasis, right? But how is this negative...

It's for english so there's a word limit and I'm not really allowed to go into anything really interesting, but it's not that bad anyways. Tell me what you think. I need a better conclusion.. I hate conclusions.

Does anyone know what sort of negative feedback there is to a state of dopamine surplus? I always assumed it involved some kind of downregulation, thinking along the lines of receptor downregulation, and maybe reuptake channel/MAO-A/catechol-o-methyl transferase upregulation. But I just...

Hi there. i need some help from you guys can any of you tell me how to prove the effects of negative feedback mathematically? i need to prove that negative feedback causes -reduction in gain -reduction of distortion -increase of gain stability -increase in bandwidth increase in input...

hey all, these are going to be my first year physics courses at univ. i was just wondering what you all thought of them! I am majoring in EE and not the greatest fan of physics but these 3 courses are mandatory and i understand why, i was just looking for you input! thanks a bunch. :smile...

Herewith attached is the problem that I am working on. I would appreciate anyone's feedback.

Here is what I believe to be the base concepts for understanding a strategy towards discovering the equations of the grand unified theory, and all other theories that have to do with existence,space,time,etc.. First of all, know that all complex things and designs are built from simple...

How does it work for the 'Adrenal Gland'? I cannot find this information anywhere and I need it as soon as possible, thanks. Thank you.

Hey guys, I am currently solving a problem involving shunt series-series feedback. So far this is what I can say about the circuit: - Series mixing is feedback combined with source - Negative voltage feedback samples output voltage - Series voltage feedback stabilises close loop...

Some of the high school students where I work have shown interest in video feedback (affine transformations) and fractal geometry. I once saw a video where some people at Georgia Tech (Georgia Institute of Technology) were doing some experimentation with video feedback. I don't know what became...

Hello, I'm doing some work for school and have a question about glucose regulation in the human body (I hope this is the right place to post this, I apologise if it isn't!) In glucose regulation, what are the receptors that detect the change in glucose levels? I have read some worksheets...

Hi, my name is Jeremiah Hendricks and I recently completed a research paper on the effects quantum physics has had in other fields. Part of our assignment is to get feedback on our paper from an appropriate audience. It would be helpful if you guys could read my paper and then answer the quick...

I wrote an interesting paper, and I require feedback. Could you please check it over. Thanks in advance. -------------- 20 joules equals 20 joules, right? Well, consider the following: "Ball A" work done = 20 joules force = 10 Newtons mass = 10 kg acceleration = 1...

Greetings ! I realize that evolution goes on due to random mutations of individuals in the spicies and then survival of the fittest along a sufficiently long period of time. My question is, and please go easy on me 'cause I know very little about this stuff, is it all random like I...