Questions attempting to analyze the mathematical properties of a formula, the inner workings of a protocol, or the design of a given circuit.

learn more… | top users | synonyms

1
vote
0answers
25 views

how to draw amplitude spectrum in fourier series?

I want to draw amplitude spectrum of a fourier series of a triangular waveform. If I have trignometric coefficient values only, how can I draw amplitude spectrum. I faced some problems when trying to ...
0
votes
0answers
47 views

Cathode Ray Tube: Non-Uniform Magnetic Field

For an experiment, I found out that the charge to mass ratio of electron was \$ 1.91 \times 10^{11}~Ckg^{-1} \$. So, I overestimated from the theoretical quite a bit. I used a cathode ray tube with ...
9
votes
1answer
130 views

What happened to all of the Dynamic Signal Analyzers?

Decades back there were at least half a dozen instrumentation companies offering Dynamic Signal Analyzers (DSA's). Not Spectrum Analyzers, but rather Dynamic Signal Analyzers. The main differences ...
0
votes
3answers
72 views

Gain vs Output Impedence

I am currently trying to improve my understanding of analogue IC design and my textbook kind of brushes over this problem. It is made quite clear that a low output impedance is desired so that the ...
0
votes
1answer
40 views

Oscilloscope training resources

I would like to learn to use an oscilloscope properly. I used them a few times at school, but that was a long time ago and I've forgotten most of what I learned about their use. I'm now working with ...
0
votes
1answer
27 views

Sensor Performance Analysis

I've recently built a temperature sensor and have been testing it against a reference thermometer in several different scenarios/environments/temperature ranges. My question is, how do I analyse my ...
0
votes
2answers
79 views

Current Generalized Immittance Converter (CGIC) Nodal Analysis

Below shows the current generalized immittance converter. I am trying to derive the transfer function (V3/Vin) of the said filter but I am getting problems in obtaining the voltages at some of the ...
2
votes
1answer
54 views

When to process beam forming algorithms?

I am building a system that uses beam forming to locate noises at different spots. All of the spots will be in front of the microphones (180 degree range of spots). My first question is if the beam ...
0
votes
2answers
80 views

Circuit analysis (Intro to Parallel Circuits & Series)

We are just in the beginning phases of learning how to simplify circuits by finding equivalent resistance. I've gotten every problem right except for this one. The answer says its 2000 ohms, but I ...
0
votes
3answers
223 views

Can somebody please analyse this circuit [closed]

Can somebody explain to me how this circuit works? i understand that it is an audio amplifier circuit and it inverts the signal, and inverts it again, but i am not sure why this is the case. also ...
0
votes
1answer
41 views

Nodal Analysis Question

I however do not see any wrong with my approach. But I am not getting the correct answer. Is there anything to do with grounding? Or am I missing something else?
0
votes
4answers
176 views

Solve a circuit with the nodal analysis (1)

I have the following circuit... ...and I want to find Vo with the nodal analysis. At node 1 (V1): ...
1
vote
0answers
81 views

how to treat a diode in a transient analysis

Hi, this fig is a model of a circuit, where the cap is representing the gate-to-source capacitance of a hi-side FET in a bridge circuit driving a coil. VD is the intrinsic diode in the FET from Source-...
4
votes
5answers
402 views

Assistance with CMOS simulation

It's been a very long time since I took intro level EE courses. I'm working on a hobby project and as a refresher I figured I would simulate a CMOS inverter. For the life of me I can't figure out why ...
1
vote
1answer
69 views

Loop analysis in confusing circuit

Here is the circuit I am trying to analyse. simulate this circuit – Schematic created using CircuitLab Now I know generally how to do this. Loop 1 we can call the RIGHT one and Loop ...
0
votes
2answers
61 views

What is a mesh/loop in a circuit?

I am a total beginner in electronics. I think it's apparently easy to identify all the concepts in the tutorials and books. The problem is that the concept is exemplified only a few times in simple ...
2
votes
1answer
54 views

How to calculate R,L,C on a bandpass filter?

As part of a project I'm doing for the class Signal and Systems Analysis, I'm given the following: With A=10, T=0.25ms and To=1ms. I am then asked to: After reading a lot, I think that I ...
1
vote
3answers
87 views

How can the FFT analyze a wave in which the components are changing?

Based on what I've read about Fourier Transforms, it seems that they are designed to work on waves whose components are constant. For example, a simple square wave is \$\sin(\theta) + 1/3sin(3\theta)...
7
votes
8answers
2k views

Engineering Electronics: which approximation is usually good enough?

I have a strong computational background, so approximations with floating point precision depend on the type of computation. One thing is to know how to make an approximation and another one is when ...
3
votes
1answer
265 views

How do I find out which current/voltage to use for an unlabelled LED panel?

I have a 600mm x 600mm LED panel with 576pcs 3014-type SMD LEDs in some unknown configuration/topology (edge-lit, similar to this one here: http://i01.i.aliimg.com/wsphoto/v0/1990066259_5/Wholesale-...
0
votes
1answer
153 views

Question on DC analysis of BJT - Common Base

I'm trying to solve a question from my book. The answer for the question is given but I keep getting a different answer. I don't know if I'm doing it the wrong way or the book is wrong. This is the ...
0
votes
2answers
522 views

Circuit analysis and general study tips [closed]

The more work I do in the field of EE, the more I realizing that my general circuit analysis skills are usually the root of my confusion and could use improvement. Even after putting on my break-a-big-...
1
vote
2answers
120 views

Is there a way to solve this circuit using Nodal Analysis?

Please, take a loot at this circuit: Obviously, this is a circuit that is very easy to solve using lots of different methods. However, I'm trying to solve it using Nodal Analysis (I'm not sure if ...
1
vote
2answers
181 views

Help with DC circuit theory problem

I need help with this DC circuit problem: When the switch is open, voltage between points A and B is 2V. When the switch is closed, through variable resistor \$R_{p}\$ flows maximum current, and \$R_{...
1
vote
2answers
181 views

Nodal analysis - what to do when a supernode spans entire circuit

I'm back again with a nodal analysis question. I'm getting better, but I've come to a problem again. Consider the following circuit with the bottom node as ground: I specifically don't know how to ...
2
votes
1answer
762 views

Nodal analysis - how to handle two adjacent supernodes

I'm a first year engineering student who has a problem with harder nodal analysis problems. Consider the circuit in the attached image. The usual way to deal with the voltage sources in the upper ...
2
votes
3answers
429 views

Thought Process on Designing Circuits

I'm currently in my second year of computer engineering. I've taken circuit analysis courses and have a good general understanding of components, and a little bit of digital design, however, I'm very ...
1
vote
0answers
106 views

I'm trying to determine the Thevenin voltage of a circuit using the node voltage method

I'm trying to determine the Thevenin voltage between the terminals a and b on this circuit: Notice that I've named the three essential nodes \$v_1\$, \$v_2\$ and \$v_3\$. I've highlighted the ...
2
votes
2answers
267 views

DC analysis of common source MOSFET circuits to find gate voltage using different power supplies

simulate this circuit – Schematic created using CircuitLab strong text I am solving problems on DC analysis of MOSFET circuits. We are supposed to find various parameters like Id(Drain Current)...
1
vote
2answers
2k views

Since the z-transform of the zero order hold is 1, why bother including it in analysis or simulation?

The \$z\$-transform of the zero order hold is 1. So why should it even be considered in the discrete time analysis or simulation of discrete time control systems? $$Z\left(\frac{1-e^{-sT}}s\right)=\...
3
votes
4answers
8k views

How to change the frequency of AC supply?

Im using an inverter to convert Dc into Ac from battery. I want to control the frequency of the alternating current ie., increase and decrease gradually (eg: 1Hz 2Hz 3Hz... 60 Hz). Is it possible to ...
-2
votes
1answer
79 views

AC Analysis Mindset [closed]

I'm just trying to solidify my foundational knowledge of ac analysis. So when approached with a basic circuit, lets say a RLC circuit, should my first instinct be to convert each group of components ...
3
votes
2answers
484 views

Av for small signal analysis with BJT for unbypassed emitter and ro in place

My question is about another question on this site. On that question Z(in) for small signal analysis with BJT for unbypassed emitter and r0 in place Zin is asked for a common emitter configuration ...
-2
votes
1answer
78 views

analysis square waves oscillator: how do I calculate the values?

Which are the Vc (V+) and V-, I's and Vout values in these circuits? The node i's and the Vc and Ic?
1
vote
2answers
102 views

What is the sign convention for generated power?

Generally speaking, generated power is denoted as negative, correct? If I understand correctly, this is just the convention. Conceptually, I think of it kind of like a force, it has a magnitude and ...
3
votes
2answers
1k views

Thevenin equivalent resistance of circuit with diagonal resistors

I'm trying to find the Thevenin equivalent for part A of this circuit: I begin by opening the circuit at the dotted line of part A. Then I try to find \$V_{oc}\$ across the two terminals that are ...
0
votes
1answer
66 views

Should I assign currents to voltage sources in my circuit analysis

Mortals! I apologize if my question may seem, foolish, but I have a need of understanding a process in analyzing circuits. You see, when we are looking at resistors (non-sense, my lightning never ...
1
vote
1answer
93 views

PMDC Motor transfer function

I'm doing an analysis of a PMDC motor and I don't understand something about the transfer function. I have the following equation: \$(K_t\frac{1}{((s* L_A) + R_A)})(V_I(s)-k_b\omega(s))= (s^2J_m+...
3
votes
3answers
735 views

Poles in electrical engineering

I'm currently an undergraduate electrical engineering student who recently took an elective mathematical course on complex analysis, where we learned about all kinds of singularities for complex ...
1
vote
1answer
1k views

Superposition Theorem/Nodal Analysis

I'm having a little trouble understanding this worked solution. My understanding of superposition is that we "turn off" every independent power source except the one we plan on analysing, then we ...
0
votes
1answer
49 views

Finding the Current I1 using Polar Notation

For the circuit in Figure Q3. Convert all voltages and currents to the form X sin(t + φ ). You need only find the stead-state solutions. Solution My Steps ... It seems that I am going along ...
1
vote
1answer
424 views

Using Pspice to analyze BJT transistor

As always I have a rookie question. In a project, I need to analyze the circuit below in a way that the transistor would be in forward active mode. I need to calculate resistors and voltage sources, ...
5
votes
1answer
163 views

What's wrong with my boost converter math?

I'm working some equations for a boost converter, and running into a contradiction I don't understand. Assume a steady state, perfect efficiency, and continuous conduction. Total instantaneous ...
1
vote
2answers
167 views

Link between zero state response and the particular solution for an everlasting exponential input

In an LTI system, when the input is the characteristic function (i.e. an everlasting exponential function say \$e^{st}\$ ), the ZSR which is obtained by the convolution integral with \$h(t)\$ is \$H(s)...
3
votes
2answers
13k views

Diode circuit analysis using ideal diodes exam problem

I've been reviewing some past exam and stumbled across this question So I need to find the current I through the middle diode and the voltage across the bottom left 10KΩ resistor. To try solve this ...
0
votes
1answer
387 views

How to do derating analysis

I need help in learning derating analysis for a vienna rectifier circuit (may be anything). Do you guys suggest any material to do the derating analysis by hand for each component understanding the ...
0
votes
1answer
3k views

Using an LM331 as a frequency to voltage converter, how to set frequency FSR?

I'm trying to use an LM331 in a frequency to voltage converter configuration. LM331 block diagram: I'm trying to implement this circuit from the datasheet for a supply voltage of 5V and an input ...
-1
votes
1answer
111 views

Identifying this “Transistor”, in this particular circuit [closed]

I'm in FIRST robotics, and I've been helping with our robot over the past few weeks. Every robot (in FIRST) is required to have a status light, which is fancy-ily connected to some other gear. ...
2
votes
1answer
119 views

How to interpret this bode diagram

I have this bode diagram. I am wondering how to interpret this. We start off with 90 degree phase lag e.g. a integrator. Then at approx 12 Hz we drop another 180 degrees indicating two integrators. ...
2
votes
1answer
227 views

Derive transfer function from block diagram

I have this block diagram which I already reduced pretty much: Now I want to derive the transfer function from phi_o1 to q. ...