Input Definition and 586 Threads

  1. A

    How to design an impulse input in Matlab Simulink

    Homework Statement I would like to know a way to design an impulse input in a Matlab Simulink model. I know there are step input and ramp input blocks but there is no impulse input block. Homework Equations The Attempt at a Solution If any working is needed please let me know
  2. C

    Symbolic relationship between the input and output load

    Homework Statement A testing device has the applied load located at the end of a loading bar. The loading bar is connected by a pin to the post. Find the symbolic relationship between the applied load(the "input" load) and the effective load applied the specimen(the "output" load). Homework...
  3. D

    Greatest common factor with exponents of first input

    ok so is there a function that exists (for all intents and purposes let's call it G(x,y) )where x= a^2*b^4*c y=a^4*b^2*d G(x,y) = a^2*b^4 basically gcd, but the exponents match those of the common prime factors of the first input (x) ******** equally useful would be a function where the...
  4. Boolean Boogey

    I am at a crossroads, need input from industry professionals

    First off, I am 30. Now, basically, I tried and failed to go back to college in the past couple of years. I was making straight a's in my classes but my career is quite demanding at times, leading me to miss 3 or 4 days of class and being dropped from the class. Because of this my gpa is rather...
  5. J

    A signal on a noisy channel is input to a filter

    This is not homework. I am doing old exams so i have the full solution but need help understanding it. 1. Homework Statement A WSS random signal {X(t)}t∈R with PSD S_X(ω) is transmitted on a noisy channel where it is disturbed by an additive zero-mean WSS random noise {N(t)}t∈R that is...
  6. R

    How to Input and Display a Matrix in Matlab?

    Homework Statement I have to make program that a user inputs a matrix and program displays it.Homework EquationsThe Attempt at a Solution I know the logic as in c++ I am able to display that. Here, m=input('Enter rows of matrix'); % Why not double quotes here as in cout of C++? n=input('Enter...
  7. N

    Solving for Work: 14,500J Applied to 1.2m Crowbar

    Homework Statement You apply 14,500 J of work to one end of a crowbar. If the crowbar is 1.2 m long, how much work is produced by the crowbar? (friction is not a factor) Homework Equations Work=distance*force The Attempt at a Solution There's hardly any information in this question so the...
  8. S

    Is it possible to have a input & output screen or speaker?

    K so you have your computer screen, and speakers, but can they record too (input)!? My speaker vibrates by electricity to make sound, so why can't my voice make (these speakers) vibrate and send electrical signals back? A wire shoots out photons in x amount of brightness through a color-filter...
  9. F

    Python How can I input a polynomial equation of infinite terms in P

    I have been given a task to create an interpolating/extrapolating programme. I have completed the programme for linear interpolation (2 points) but now must make it usable for 3 or more points, ie a polynomial of n points. I think I have the equation in general for a polynomial as it is an...
  10. O

    Determine input voltage given resistances

    Homework Statement [/B] Calculate the expected input voltage for each set of resistances below. For the CMOS gate, assume the input resist of the gate is infinite. Homework Equations i=v/R Voltage divider rule v*R1/(R1+R2)=v1 The Attempt at a Solution 1)For R1=1K and R2=infinity, would V...
  11. PhysicsGuy99

    AC-Coupled Current Input to Amplifier

    Hello all, I am looking for a means of AC-coupling a current input to an amplifier http://www.thinksrs.com/products/SR570.htm . I found some methods to do this with a simple op amp set-up, but I am not sure how to accomplish this with this instrument. The reason I want to remove the DC current...
  12. B

    MATLAB How to give a step input in Matlab?

    Hello, I have a state space equation at hand.. This attached with this... Now the term (theta double dot) is a positive step for 0,136 milli seconds and negative step for next 0,136 millisecond and 0 at all other times. So that when I simulate I will get a graph as below: This is the nature...
  13. H

    A power cycle receives heat input from solar collectors...

    I am having trouble with this problem. I have drawn the diagram , but don't know how I can attach it onto this post. But, for a I have COP= Qin/Wcycle = 650 J/m^2 s / Wcycle = 32.5 kW/Wcycle --> Wcycle = 10.15 kW. But,that is the wrong answer.[PLAIN]http://
  14. S

    Find the voltage gain, input and output resistance amplifier

    I am having a difficult time solving the question in Step 2 of the attachment. The question is "Use the equivalent-circuit model of the uA 741 to find: The voltage gain Av=vo/v1, the input resistance R1, and the output resistance Ro of the amplifier circuit. Attempt at solution: I used the...
  15. D

    Calculating Line Voltage and Power Factor in a 3-Phase System: A Case Study

    In the three phase system of Fig. 8.4, calculate the magnitude of the line voltage V and the input power factor. Data V 1 = 400 V, Z ̇ L = 0.1 + j0.2 Ω, P 2 = 10 kW cos φ 2 = 0.6, Z ̇ 1 = 5∠60 ◦ Ω delta connected, f = 50 Hz. The results are: V=462.76 Cosphi=0.506 In the image attached there...
  16. P

    How to reduce the current of a signal by an exact amount?

    Hello all, The root problem is that I can't put all my analogue inputs onto one input card (each card has 4 inputs) on the project I'm working on. We have four sensors, they should all output 4-20mA. Two are source type outputs, supply voltage goes in, sensor current comes out, current is...
  17. K

    Gearing Down A High Speed Input (>10K RPM)

    Hello All, I am trying to find a combination of gearing technologies to satisfy the below design challenge. I don't see a commercially available solution; I am hoping you might be able to help me understand what physical effects make this design problem hard, and propose solutions worth looking...
  18. M

    Maximum Source Resistance for Optimal ADC Performance

    Homework Statement A simplified model of ADC noise refers the noise to a noisy source resistance Rn while assuming the rest of the signal path to be noiseless. Figure 3 represents a particular 18-bit ADC that has a 10 V input voltage range. The ADC has a bandwidth of 1 MHz. Calculate the...
  19. perplexabot

    Input Resistance of Common Gate question....

    Hey all. I have been trying to calculate the input resistance of a common gate amplifier, but seem to have problems doing so. I know I have to set a test voltage (or test current) at the input, and I've been told, to ground the output. So using the Hybrid pi model for a mosfet, I did the...
  20. perplexabot

    Entropy question for 2 input 1 output system

    Hey all. I have a question regarding the solution to a question, both shown below (only part of the solution is shown). Specifically the line that states: H(Y|X) = H(Z|X). Why does this equality hold? Expanding and using the definition of entropy, I can see that for the above equality to hold...
  21. thankz

    Example of a variable capacitor input op-amp to voltage....

    example of a varible capacitor input op-amp to voltage level circuit. I'm not sure how to turn reactance to a voltage level using an op-amp? :wink:
  22. I

    Am I confusing input & output impedance?

    Homework Statement design a common-emitter amplifier with an output impedance of 4.7kOhms and again of-10 using a transistor with a beta=200 powered by a 12V DC supply. Homework Equations v=ir The Attempt at a Solution ------------------------------------------------------ rest of the...
  23. J

    Two programs to receive keyboard input simultaneously?

    Hi, A tough one here. Does anyone know a way to control 2 or more programs simultaneously? i.e. give focus to two programs? My brother wants to control two games (full screen), on the same PC, at once, I assume that he only needs one to be maximized at a time, but the trouble is giving focus...
  24. M

    Calculating Transformer Input Voltage

    Homework Statement Calculate the primary current, and hence the voltage at the transformer input winding, V1. Transformation ratio, a = N1/N2 = 0.1 R1 = 0.12 Ω; R2 = 12 Ω X1 = 0.4 Ω ; X2 = 40 Ω RC = 560 Ω V2 = 2300 V RL = 1 kΩ 'Xm = 800 Ω' Homework Equations R1eq = R1 + a2R2 X1eq = j(X1 +...
  25. P

    Testing the reduction of input to output ripple of MC7805

    Homework Statement How does the RC-link help with adding ripple to the signal? What would happen if the capacitor was removed (short-circuited)? Homework EquationsThe Attempt at a Solution I believe that the role of the capacitor is to pass on the AC voltage. Initially the capacitor is charged...
  26. A

    Best possible shape for the input controller?

    My project involves tangible user interfaces. I have developed a game in which the input will be any squeezable object. The input will have force sensors in it & the user's squeeze will be converted to electrical signal & characters in the game will move accordingly. Mode of squeeze is by...
  27. C

    Small-signal transfer function from this differential input

    Homework Statement 2. Homework Equations [/B] Small Signal Equivalent Circuit, Kirchhoff Current Law, and BJT equations mentioned in the question. The Attempt at a Solution It looks like I did something wrong. Can someone help me with fixing this?
  28. Chacabucogod

    Control Theory State-Space method with derivative input

    Hi, I'm reading Ogata's Modern Control Engineering, and when he talks about the representation of a differential equation in state space he divides the method in two. The first one is when the input of the differential equation involves no derivative term, for example: x'(t)+x(t)=u(t) The...
  29. A

    Python Python: How to show entered input results when entering a 0

    Homework Statement So, I have a program, which I am finishing but I apparently ran into a problem. In the program I have to make that whenever I enter a 0 in the input, the program will stop and print the results. Here's the program before I continue saying anything else: The Attempt at a...
  30. V

    Simulink help for getting a frequency I can use as an input

    Ok, say I have a sine wave block that has a frequency of 60Hz. What can I do to get that frequency as a number so I can use it as an input to another block? I've tried various things such as a "sign" block that counts when it switches from positive to negative and then a counter that resets...
  31. A

    Asking a user for a correct input until they give a correct response

    Homework Statement I need a program (in PYTHON), which would ask a user his name and grade, then print them both. 1) If the name has a number it, the program has to ask the same question again until the name is entered correctly 2) The same with the grade. If it's higher than 10, the program...
  32. S

    Finding the equivalent resistance of an RL cct & step input

    Homework Statement Determine the inductor current i(t) for both t<0 and t>0 for the circuit shown in the attached document"Circuit 1. Homework EquationsThe Attempt at a Solution Before t=0, i=(25)/(3+2) = 5A After t=0, i(t)=i(0)e^(-t/tow) tow=L/R=4/(6/5) However, the...
  33. Alxb577

    Difficult Logic Gate Puzzle Using Only 2 Input NAND Gates

    Homework Statement [/B] Impliment the expression which is already in minimum sum of products form using only two-input NAND gates. No gate may be used as a NOT. All inputs are available both uncomplemented and complemented. (The number of gates required is shown in parentheses.) f = ab'd' +...
  34. Steven Ellet

    Speakers, loudness, and electrical input

    What is the formula for speaker input/output? On a related topic, on a motor an input of x (electricity) equals output of y (movement) and an input of y (movement) equals output of x (electricity) x=y and y=x Is the theory of x=y / y=x applicable to speakers? x=electricity y=loudness
  35. B

    DOUBLE cannot convert the input expression into double array

    Hi Folks, I have a symbolic A=18*1*18 array containing symbols/expressions. I want to populate certain entries of this array into another matrix. For example K(1,1)=A(1,1,1) I get the following ? The following error occurred converting from sym to double: Error using ==> mupadmex Error in...
  36. QuantumCurt

    Need input on junior/senior course plans

    Hey everyone. I'm in my last semester of community college, and I'm getting ready to transfer to UIUC in the fall. I'm looking ahead to my courses for junior and senior years, and I'm wondering if what I've come up with is a reasonable goal. I'm planning on doing a dual bachelor's in physics...
  37. C

    Is the Formula P=Torque(angular velocity) Valid for Measuring Bicycle Power?

    hi PF. i just want to ask if the formula P=Torque(angular velocity) is valid? saw this in wikipedia. if not, any idea how to measure the power exerted to a bicycle? thanks
  38. A

    Transmission line input impedance

    Homework Statement (a) A transmission line has a length, ℓ, of 0.4λ. Determine the phase change, βℓ, that occurs down the line. (b) A 50Ω lossless transmission line of length 0.4λ is terminated in a load of (40 + j30) Ω. Determine, using the equation given below, the input impedance to the...
  39. Feodalherren

    MATLAB: input arrays into function

    Homework Statement Homework EquationsThe Attempt at a Solution Okay, so first off I'm just trying to write the code for scalars: -------------------------------------- clc ; clear P = 2000 r = .035/12 n = 36 F = (1 + r).^n A = (r*P*F)/(F-1) --------------------------------------- This...
  40. P

    Is Input to a Thermocouple a Step or Ramp?

    Is input to a thermocouple a step or ramp?
  41. A

    How Does Input Capacitance Influence IRF530 MOSFET's Maximum Input Frequency?

    Hi everyone, I am using IRF530 in a half h bridge DC motor driver. The MOSFET is behaving erratically if the PWM frequency is increased above 20 KHz. I checked the datasheet thoroughly but could not find any thing related to maximum operating frequency. Is input capacitance related in any way...
  42. Mr Davis 97

    What is the significance of using a variable as an input to a function?

    For a generic function ##f##, why is that we use the variable ##x## as the argument of the function? What is the significance of this variable in regards to the object that is the function? Does it denote what the function is able to transform? i.e., ##f(z)## usually denotes a function that...
  43. Q

    Finding output of voltage for certain input voltage diodes

    Homework Statement We have the circuit in the figure.I have to find the output graphically if the input is Vi=15sinwt. Homework Equations This type of exercise doesn't have any equations The Attempt at a Solution Heres the circuit http://i.imgur.com/ivixWzH.jpg For Vi<= -10 the diode is ON...
  44. K

    Transformer help please -- AC Mains transformers of different input voltages

    Hiya Does anyone know if there's any safety or performance issues with going about the input voltage of a transformer? The spec on maplin says on just about every step down transformer that the input is (x)v-230v. As I live in the uk, mains voltages are 240v a.c. Not sure about what to do
  45. M

    Find the Best PDE & Fourier Books - Your Input Appreciated!

    Hello everyone, I'm in need for the best books that you know out there for PDE (Partial Differential Equations) and everything related to Fourier (series, transform, etc.). Any help would be much appreciated. Thank you and happy holidays!
  46. Z

    MHB Finding function given new input

    The function f is defined by f(x)=x^2+5 Find f(3z) How do I find f(3z)
  47. AlbeFerS

    Finding UO2 Enrichment Value for MCNP5 Input File

    Hi there, I´m just finishing an input file for MCNP5 and I can´t find a value of density for UO2 enriched to 3,25% - 3,6%. Does anyone know it or know where I can find it? Thanks in advance! (P.D.: wikipedia is not my friend... )
  48. SpacemanRich

    Is Calculus for Scientists and Engineers by Briggs and Cochran a Good Textbook?

    Hi, This is my first post here. But I have read many of the others before joining the forum. I have to say I am happy to have found it. Ok, let me get to my question. I'm interested in if anyone has any opinions / experience with a text called "Calculus for Scientists and Enginneers" by...
  49. sheldonrocks97

    Write a C program to read values for times from the input file?

    Homework Statement Write a C program to read values for times from the input file times.txt; compute sin(5*pi*t) for each time t given in times.txt; output comma separated values of t, sin(5*pi*t) into an output file named output.csv; and compile the program using a makefile. Hand in a copy of...
  50. Piyush Gupta

    MOSFET input Voltage for saturation region

    I'm trying to solve for the minimum vIN such that MOSFET is in the saturation region. Here are the given parameters VS+ = 1.0 V VS- = - 1.0 V VT = 0.5 V In order to enter saturation I know that VDS > VGS - VT VGS = VIN - VS- VDS = Vs+ - Vs-, which is 2 V Which means 2V > VIN - VS- - VT 2V...
Back
Top