# Tagged Questions

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### Why we can't use step function to identify system's transfer function

The following screenshot is from this web page. The goal is to evaluate (or see if we can evaluate) the transfer function of a system by using the step function as an input. -Please refer the ...
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### Powering Several Electrical Components from Single Three-Phase 240V AC Supply

A system consisting of various electrical components is desired. Required supply voltages to power these components include the following: three-phase 240 V AC (directly through the supply), 24 V DC, ...
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### Using a Mux to switch between reading and driving a wire

I have been doing some googling and cannot seem to come up with an answer for this. The way I understand a mux is that it is basically a 2 way switch. I understand it is mostly used to select inputs ...
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### Linear time-invariant system

Hey all I have the following question and I am having trouble getting to the correct answer. Here is what I have: (sorry I do not understand how to format the question) Consider a linear ...
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### How does a zero in transfer function affect the bandwidth of a system

Suppose we have a system with the closed-loop gain: $\displaystyle G(s) = \frac{\omega_n^2}{s^2 + 2\zeta\omega_n+\omega_n^2}$ Which is the default two-pole system closed-loop gain. Let's also ...
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### Meaning of causal signal

What exactly does causal signal mean? Causality,as I see it is a property of a system wherein the output at PRESENT is dependent ONLY on PAST and PRESENT values of input.Here we have a reference of ...
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### Failures in electronics systems

Why do electronics systems stop working? What kind of parts are almost certain to fail after a certain amount of use? Can some keep going for centuries? In data sheets I don't think I've ever seen an ...
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### LTI system described by a differential equation

Lets say an LTI (linear time invariant system) is describe by a differential equation such as this: $$\sum_{k=0}^{N} a_k \frac{d^k y(t)}{dt^k} = \sum_{k=0}^{N} b_k \frac{d^k x(t)}{dt^k}$$ (source) ...
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### plotting frequency response

Above is an excerpt from a textbook. My question is, why is that when we plot H(w), we need to think of it as a complex exponential???, can't we just plug in values for w and t, evaluate it, and ...
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### State space representation in s-domain

I was supposed to find state space representation and its matrices of this system: and I have no idea, how to do this. We were told not to transfer the system to time domain, but I can only do ...
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### How to mass-produce a electronic system assembled by me?

"Practically speaking", given I developed a electronic system (in my case with the Arduino board), what are next steps to make in order to produce and market that system (in my case, regardless of ...
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### Frequency Response Help

A discrete-time linear and time-invariant (LTI) system is given by the following input-output relationship: y[n] = 2x[n] − x[n − 1], where x[n] is the input and y[n] is the output. (a) What is the ...
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### Definition of a System

A mathematical operator is generaly a mapping between a domain set of functions and a range set of functions.One example is the derivative operator L ( L[f] = f' ) for example. Can i say every ...
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### Control system to minimize a parameter

This is a pretty vague question so please bare with me, I can add further information if required just let me know in the comments. So here is the problem that I want to solve. There is a system ...
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### Time-Invariance Evaluation

I have a system which is described by the following mathematical equation: $y(t) = x(2t)$ I know this system is not time-invariant and the reason is that the response from this system to a delayed ...
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### Need suggestions for amaster thesis on wireless sensor systems [closed]

I am going to write my master thesis on a wireless sensor network for a fire security system. The wireless protocol is decided and confidential, and has mesh capabilities for redundancy and great ...
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### Powering an old two box metal detector

I recently bought an old two-box metal detector that uses radio tubes and runs on the old radio batteries. There are two boxes, One is a transmitter box, the other is the receiver box. one with 6 ...
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### How to measure three resistors in a triangle

I have three unknown resistors arranged in a triangle (a delta) and need to determine one of them, which is on the order of 100x larger than the other two, in a measurement circuit. I'm wondering if ...
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### How to reverse the effect of an alarm?

I am wondering if it is possible to make an alarm that normally operates/sounds when electricity is flowing through a wire to do the complete opposite. The alarm sounds when there is a constant flow ...
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### How to determine a system is stable using pole zero analysis?

To my knowledge, as long as the poles of the transfer function are in the left half plane, then the system is stable. It is because the time response can be written as "a*exp(-b*t)" where 'a' and 'b' ...
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### Question about MATLAB Estimate Nonlinear ARX model? (A basic english + engineering question)

First of all, I am a non native speaker. Please help me to understand what exactly MATHWORKS work about NLARX function. My question is what are the difference between nb and nk and how I should write ...
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### What type of amplifier do I need for this project?

I'm trying to make a custom PA system for my car, but I am confused about what type of amplifier I might need, or do I need one at all? I'm wanting to take the main sound unit out of a "personal ...
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### How to find an embedded platform?

A bit of background: We have a system currently in production, but the original programmer passed away, and the current hardware manufacturer cannot find hardware to run the (currently) DOS system, so ...
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### How do I go about powering appliances from solar energy

I would like to learn how to power some house hold appliances from solar energy. I haven't had any experience with electronics but am eager to spent time reading and experimenting. I've done a ...