Input Definition and 619 Threads

Hello. I have a very quick op amp question. I'm trying to understand an omp amp. My question is will vout of an op amp go to zero if the inverting input is greater than the non inverting input ( even if there's a negative/positive feedback)?

Hi...can anyone tell me whether there is a decade counter which has only 1 input, 10 outputs and an up/down clock?

Hi all, Love the forum, just signed up but have been reading for a while. I'm not an EE and I am working on some image processing, so I need some hardware help. What I want to do is to have ~20 USB webcams, of which any 4 are selectable to feed into MATLAB. I have the software side running, but...

Hello all, I wanted to know if there was a way to read in numerical data on the same command line on which you execute a file. I know you can do that for i/o files like: test.exe < file1.in > file2.out But I wanted to know if there's some similar notation that can be used for floating...

Hi All, Let me preface by saying this is my first post, but I'm very glad to have found and joined what looks like a great community here. Also I have no Fortran experience, so please bear with my greenness: I'm trying to resurrect and use a code written by another engineer in our...

Homework Statement I have a trouble understanding what would be the output when for example we say let's input the signal x(k*n) or x(n-n0) to the system... this has given me problems when having to solve systems for which I have to check the property of time invariance suppose we have a...

in regards to power adapters, mainly the brick-type ones that come with laptops and external hard drives, how is the output current greater than the input current? for example, i see a laptop power brick with the following: input 100-240V~1.7A 50-60Hz output 18.5V == 3.5A 65W how...

SOLVED Homework Statement Very small dimensions-those on the atomic scale-are often measured in angstroms. An angstrom is represented by the symbol ? and corresponds to a length of 10^-10 meter. Create an inches-to-angstroms conversion table as follows for values of inches from 1 to 10: Use...

I'm feeding the current in pulses via 50v 6800 mfd capacitor. Will it destroy the ignition coil instantly, or will just overheat it? It won't be for automotive use but for general high voltage experiments. As long as instant destruction is a remote possibility, it's easy enough to mitigate...

My gfortran compiler gives me the following message when I try to open a file in order to read it:Fortran runtime error: No such file or directory logout The line in the program where this file is is written in this way: OPEN(UNIT = 7, FILE = 'GPROP.DAT', STATUS = 'OLD')...

I am doing a tacho-meter of a single 12V power supply, it is meant for a car engine. However in real life the power supply from an real vehicle fluctuates between 10-14V. In this situation it is clear that some form of power supply regulation is needed. I am currently considering a...

I was going thu AM26LS32 diff line receiver. The data sheet has a ckt diagram for the input stage. But I don't understand it. I have attached the input stage from datasheet(page3) The input stage actually looks like a push pull output stage. What is the function of the 100K resistors and...

Input a polynomial into FORTRAN? Hello all, I took a Fortran programming class last semester and can write Fortran well. However, I never recall anyone ever asking if there would be a way to input a polynomial into the command prompt. I'm assuming there is not. It would be great though. I have...

Hi, :smile: Please have a see Example 1-5 on the given link: http://img854.imageshack.us/img854/8376/inputimpedance.jpg The example mentions input impedance. What is it in simple words? The book says: Because this input impedance is across the measured terminals , a small current flows...

Keyboard input does not match keys - Please help! I currently am having a massive issue with my computer. The input keys do not match the keys on the keyboard and all input goes to hotkeys. I have to use on screen keyboard to type. The keys themselves worked, but are automatically redirected...

Homework Statement Hey. I've posted a few questions around here lately, and really appreciate any help! thanks Right, attached is an image showing a simple pump system. pump inlet gauge pressure = Pi = -34.2 kPa nozzle diameter = 5cm rho = 1000kg/m3 Calculate the flow rate 2. The...

Homework Statement A ball ( 2.7 g ) is launched at a 45 degree angle with a solenoid input of 50V. What is the initial speed of the ball? Homework Equations KE = 0.5mv^2 PE = mgh dy = vy(0)t + 0.5at^2 dx = vx(0)t The Attempt at a Solution Voltage is potential energy and I...

Hi, Hi. I am trying to enter some differential equations into a Runge-Kutta 4th order spreadsheet which requires input in the form y' = ...? My differential equations are in the form : dvx/dt = -FDvx/mv (i.e relate velocity derivative with respect to time to acceleration). Can anyone...

if the electrical energy stored in the leaf's battery pack came from a standard power plant and was delivered by a utility company ( like United Illuminated or Connecticut light and power) it was generated, transmitted, and transformed to the DC electricity that a battery can store at no more...

Homework Statement I am trying to determine the input I will have on a shaft with a continuous force of 3,720 pounds one foot out from the shaft center. I am thinking the input continuous torque would be 1 foot being that I am using a 2 foot pulley on the shaft, and I have a continuous...

If a question asks for the "quantity of work input to the pump" is it acceptable to present the answer as positive. I think so because the direction of energy transfer has been defined in the question itself hence there is no need for a sign on the answer. All that's asked for is the...

Hi guys, this is my first post in this forum so I hope I get some help. My question is: can an output voltage of ANY circuit be larger than its input/source voltage. I realize that in DC circuits, this is not possible because of KVL. Since the total voltage around a loop has to be zero and...

So I already have two molecules (chemically valid, the artistic interpretation never overrides that validity!) which have a very special meaning to me tatooed on my left and right shoulder. I'm still very much a beginner, only starting to study physics, however I do understand a fair bit of...

This question has been boggling my mind. The capacitor input(C2) filter in this schematic helps me filter the output from the rectifier. With combination of Rchoke (is just a resistor and not an inductor) of 2.4ohm, it limits my peak current and filters the output voltage from the rectifier...

Homework Statement Hello, I did the following measurement: A piezo element (mass approx. 50 gram) is fixed onto a vibration shaker The force exert on the piezo, 0,124 N (rms) is measured with an impedance head The vibration frequency (sinusoidal signal) is 142,4 Hz The acceleration is...

Homework Statement Hello, Just a quick question here for Python. I'm using raw_input to get the user to type in a string, but I want the letters to display as * (like when you enter a password) as they type it. (But not actually register as *). Is this doable in Python? Thanks...

I am trying to input these 2 equations of motion for a double acting pendulum into mathematica in hopes of solving for θ2, θ2', and θ2''. I am fairly new to the program and I am having trouble inputting the equations. I am swinging a prosthetic leg like a pendulum and I am trying to predict what...

Hi everyone, i have been recently trying to get familiar with the Mathematica software for a project am working on. In the course of that i encountered a problem on graphics. here's the question: Superimpose the plots y=√(x^2+a), √a≤x≤√a+3 for the values a=1,a=4,a=9 in the same figure...

I have the following code which does not wait for input and skips right to the end. Is there something I miss? no = 0; total = 0; while ans>=0 ans = input('Input a number (negative to quit): '); no = no+1; total = total + ans; end; printf('\n'); disp('The input average...

Homework Statement Write a code with the following functions: Function 1: print a list of 4 different type variables input and output: character, integer, float, and double. Function 2: prompt and return an input character. Function 3...

i am trying to plot the output of a function given the transfer function and an input. however, i am having trouble with trying to express the input as a function in MATLAB my transfer function is m = 1; b = 2; k = 1000; num = [ 1000 ]; den = [ m b k ]; transferfunction = tf(num, den) so it's...

Homework Statement A majority circuit is a combinational circuit whose output is equal to 1 if the input variables have more 1’s than 0’s. The output is 0 otherwise. Design a 6-input majority circuit Homework Equations Probably not applicable here The Attempt at a Solution First...

Develop an application that reads city, state, and population from a text file. Example input census file: Jamestown FL 50000 Domville CO 10000 Jennyboro FL 30000 Lillyville CO 5000 If the population of the city is greater than or equal to 50,000, write the city information to a text...

Hello all, I'm a 3D graphist trying to deal with particles motions and attributes for visual FX I have a surface mapped with a black and white picture. Those different grey values gives me a x value inbetween 0(min) and 255(max). Particles are shot from this plane and from random positions and...

Hello, I need help constructing a drop-down menu in Mathematica with options depending on the selection from a previous drop-down menu. The example is first the user selects a continent, and then the second drop-down menu shows the respective countries. Any help would be much appreciated.

I am working on a physics lab and wonder if an input impendece of +/-10V input 1M (for a voltage probe) is high resistance or low resistance. Can anyone help? Thanks!

Homework Statement An Xor gate has 3 inputs w x y and its output is z. If you invert one of the inputs, what will the output be? Show this in terms of a boolean expression and no matter which input you invert, the output will be the same. What is this type of gate called? Also, what...

I am looking for some help on calculating theoretical velocity and position of an object subjected to a variable input force. The situation is as follows: weight of piston 14 lbs force on piston 4150, (500 psi on 8.3 sq in) stroke is just under 6 inches The piston is in a 3.25 in bore...

Hello Am reading about amplifiers, and the articles i read suggests that for a successfull amplification the op amp should have an input impedance and zero output impedance. I want some explanation about this information, why the input and output impedance are important factors?

Homework Statement I have polynomials of the form: x1 + x2 + x3 + x1x2 + x1x3 + x2x3 + x1x2x3 The x's can be a combination of 1s and 0s, so all the possible inputs could be written as strings: 000, 100, 010, 001, 110, 101, 011, 111 The polynomials can also have coefficients a...g, so...

Hello, I am looking for an example of two input injective function, f(x1,x2), R x R ->R. I am very grateful if you can find one. Thanks

Homework Statement Homework Equations The Attempt at a Solution so mf1=mf2+mf3 simplify energy equation shown above to: m1h1-(m2h2+m3h3)=Wflow and mf=ρAV=vf/specvol=12.58kg/s I don't know how to solve for mf2 or mf3 or diameters. (mf=mass flow, h=enthalpy, Wflow=work flow, ρAV=mass flow eq)...

Zero input means input equals zero the input is to some differential equation D2x = Dx + x + Input the input = sin(2pi * f * t) so say I want to make a program that solves for the zero input frequency response. (Matlab actually) what would I need to set the variable for frequency to...

MATLAB "quad" and difficulty with vector input Hello all. Consider the following: function y = testf(x,a) y = sin(pi.*a.*x); ...and then we have a = 0.05:0.05:1; result1 = quad(@(x)testf(x, a),0,1) which crashes with ? Error using ==> times Matrix dimensions must agree...

Hey guys, I am extremely inexperienced with MATLAB and I"m struggling putting this ode into matlab. y' = -a*y+u(t-1)-u(t-3) I know that for y=u(t-1), you type: if t<1 y=0; else y=1; end and for y=u(t-3): if t<3 y=0; else y=1; But I'm confused as to how you'd combine all of...

Hey guys, I am wondering if anyone could help me with a simple problem. I want to remove key parameters from the "type declaration/parameter" portion of my code and into an external input file for easy access. The problem is, many of my variables (such as arrays) can't be defined until...

Hi, I'm trying to model the input impedance of a MESFET by using a series RLC circuit. For example I have the following reflection coefficients: .575 angle(-138) at 6 GHz .617 angle(170) at 8 GHz .610 angle(128) at 10 GHz As you can see, as the frequency changes so too does the angle. Does...

Homework Statement Its more of a concept question... I know that the higher the input resistance = the lower the amount of current that flows across a membrane (Im learning about cells) obviously then a decrease in input resistance would mean there is more current flowing across the...

I am terrible with electric. I just need some guidance on reconfiguring a hall sensor to read the opposite input. I have an analog tachometer from the '80s that was used to sense a groove on a grounded, spinning disk. I want to use the probe (which has 3 wires) to sense a raised piece of...

I have problems with finding out how i can insert these three equations: into the TI-89 calcualtor, so i get the 3 answers in the bottom of the picture. I know how to do it if the 3 equations have the same amount of parts/sections, but like you see here the fir equation has 2 parts, but the...