Circuit (Network) analysis is the process of finding the voltages across, and the currents through, every component in the network.

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Using KCL in Mesh Analysis

I previously asked a question about how KVL is used in node analysis. I'm betting that KCL is also used in mesh analysis. Could someone explain if and how KCL is used in mesh analysis?
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Using KVL in nodal analysis

My book says the following: As noted previously, every method of circuit analysis must satisfy KVL, KCL, and the device i–v relationships. In developing the node-voltage equations in Eqs. (3–4), ...
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1answer
65 views

Making software for Circuit Analysis

I want to make software that would be capable of solving electrical circuits. Something like CircuitLab or LtSpice. I have a good background in electrical circuit solving methods and programing as ...
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1answer
41 views

Is my circuit analysis correct in this problem?

This is the problem: My solution: I'm new the delta-to-y and y-to-delta transformation, it is obvious we need to use them. I got the same answer but I'm a bit skeptical about my solution. Is my ...
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What do these pictures mean? What's property in electric circuit?

What are these properties in electric circuit analysis?
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64 views

Can't find the correct voltage and current source

I'm trying to self-study this problem but I got stuck. What I tried to do: The equivalent resistor R1 for the 12 and 4 ohm resistors is 3 (12x4/12+4). The equivalent resistor R2 for the 4 and 12 ...
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1answer
30 views

Getting proper Mesh equations

Here is the circuit I need to solve. simulate this circuit – Schematic created using CircuitLab My equations are as follows: $$Vs_1+8(R_1 +R_3)=0 \\ Vs_2+12I_2-12I_3=0 \\ ...
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2answers
73 views

RC Integrator circuit final voltage

Given this integrator circuit: And with Vin being a pulse wave which changes alternatively from 0V to 5V with a frequence of 100KHz, I need to find out the value of Vout after a large number of ...
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43 views

Finding the Thevenin Equivalent Resistance

In this problem I'm trying to find the Thevenin resistance in the circuit below: simulate this circuit – Schematic created using CircuitLab The first thing we do is remove all sources ...
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4answers
86 views

If amplitude (say voltage) of a 60Hz sine wave increases, doesn't rise time increase?

How does rise time relate to frequency? If I take 0-pi/4 of 2 60Hz sine waves, one being 2V and one being 10V, would the 10V have a higher frequency component because it has a steeper slope? I hope ...
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481 views

Can't find the equivalent resistance in this circuit

I'm trying to self-study this problem. This chapter explained the delta-to-y transformation but I can't seem to find one here. My best guess is that both resistors on the right are short-circuited ...
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1answer
42 views

Finding the step response of a RLC circuit

For a homework problem, I am supposed to find the step response v(t) for the following circuit: simulate this circuit – Schematic created using CircuitLab Where the input is \$v_s(t) = ...
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2answers
31 views

Confusing Parallel/Series Arrangements in Application of Thévenin's Theorem

I'm learning from Paul Scherz's Practical Electronics for Inventors (2nd ed.) and I've become confused at what was I thought I was comfortable with: namely parallel and series resistors. The offending ...
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1answer
37 views

Can a dependent current or voltage source make a circuit unstable?

Consider a circuit consisting of a variety of linear and/or non-linear elements and independent voltage and/or current sources. Now imagine a dependent current or voltage source is added to an ...
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36 views

Applying KVL to this circuit

In my Circuit Analysis book, I am tasked with finding \$v_x\$ and \$v_y\$. So \$v_y\$: easy enough. It's - 6 volts. But I encounter a problem when trying to find \$v_x\$ - I can't develop enough ...
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1answer
59 views

What is wrong with this PSpice simulation?

I am trying to simulate this circuit on PSpice as my first PSpice homework, I'm required to learn to simulate circuits on this software. From calculations, we know that: Ix = 16 A. Current ...
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2answers
84 views

When a voltage pulse is sent through an open transmission line, what happens to the voltage at the end of the line when the pulse is reflected?

From what I understand, the voltage doubles since the reflected and incident pulses add up. But then why don't all open terminations have double the source voltage since we can consider the voltage ...
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70 views

AC circuit with two sources

I have a pair of questions. It is a class exercise where I am asked to calculate the average power of the elements and the average power supplied. The first question: The sources are expressed in ...
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96 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 ...
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300 views

Trouble finding the R(equivalent) in this circuit

I started studying Electric Circuits one week ago so this material is new to me. I was trying to solve this problem from the book but I had some difficulty: My analysis: The equivalent resistance ...
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1answer
66 views

What is the purpose of the following configuration of diodes on an RF line?

I've been told that these are disconnect diodes. However, I am unsure as to what purpose they serve. They are used on the line that sends a signal to a piezoelectric, the return signal from the ...
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3answers
137 views

Why do circuit analysis methods work?

Both the KCL and KVL equations are required to completely model a resistor network. However, the two main methods to analyze these circuits Nodal analysis and Mesh analysis only use KCL and KVL ...
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64 views

Would my project be affected by lack of a filter?

I have chosen to do a final project, I will be transmitting bits using a wien bridge oscilator, I want a 160 MHZ sine wave and I have chosen values for it. I have chosen the AD8041 op amp because it ...
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1answer
70 views

Question with op amp circuit

$$ R_s = 1k\Omega. $$ http://i.stack.imgur.com/0iv6H.png I don't understand why when the resistance is infinite $$v_1 = V_s$$. It's clear that when a resistor has a very large value, the intensity ...
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37 views

How to determine the angular frequency of phasor?

If I've got a voltage/intensity generator expressed in complex numbers, how can I determine \$w\$ to calculate the impedances?
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3answers
279 views

Why does this current source absorb but not deliver power?

Question (Extracted from a book): Determine the voltage across each current source, the current through each voltage source, and the power delivered or absorbed by each source. Official Answer: ...
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46 views

How did I calculate the power for this source?

Let the circuit be: Given that Ix = 5A and Vy = 10V, calculate the power absorbed or delivered by each source. My solution: 10A source delivers 100W (P=UI= (-10 + 20)x10 = 10 x 10 = 100W). ...
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62 views

Nodal Analysis of a circuit with a dependent source

simulate this circuit – Schematic created using CircuitLab Hi, So the trouble I am having with this problem is that I don't know how to do nodal analysis with the dependent source. I ...
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76 views

Question with solving for complex power, S, for each component

simulate this circuit – Schematic created using CircuitLab Hi! So I have a couple questions that I have already tried to solve that I think I am going in a little bit of the wrong ...
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2answers
54 views

Finding v0 on the right side of an op-amp?

I am trying to find \$v_0\$ in this circuit (voltage across \$R4\$): simulate this circuit – Schematic created using CircuitLab The issue I am having is that I would have known that ...
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3answers
80 views

Apply Thevenin Theorem to a circuit with 2 sources?

simulate this circuit – Schematic created using CircuitLab I have this circuit: Sorry the current source got cut off when loading. It is 3 Amps. I was trying to apply thevenin's ...
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2answers
120 views

How to do Mesh Analysis with Current Sources?

Basically the circuit below is what my professor gave us and we need to solve for the the voltage across the 8 ohm resistor, the current through the 2 ohm resistor, power absorbed by the 10 ohm ...
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46 views

Help formulating node equations

simulate this circuit – Schematic created using CircuitLab The problem is to find the node voltage at e2 (I added the current lables and directions) After getting it wrong, and seeing ...
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2answers
75 views

Inductors in series with different currents

I'm having trouble finding the differential equation that describes the circuit, at t=0 10A flow through L1 and 0A through L2, since current can't change instantaneously. But they're in series so ...
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1answer
53 views

Shunt ohmmeter statement

Please refer to this link On page 4 there is a statement "Further, at half deflection, current through \$R_h\$ is equal to sum of the currents through \$R_{sh}\$ and \$R_{m}\$". How has this statement ...
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Linear vs. Audio Taper for RC Network

I'm building a distortion pedal and I was wondering which tapers to use for which potentiometers in the tone control section. I normally design my own circuits, but I'm going by someone else's ...
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How is current split with two parallel LED's?

I have two LED's in parallel with different forward voltages, and want to know how much current flows through each of them. They have one series resistor connected before being split. Like so: As ...
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1answer
34 views

Analyzing/designing positive feedback amplifier

I've been searching all around to find a tutorial on analyzing/designing a positive feedback amplifier, especially a single transistor in common collector mode, but with no luck... So, lets say I ...
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4answers
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KVL loop current direction convention--should be same in all loops?

Do we have to take the same sense of direction for loop current, like clockwise, in each loop when applying KVL to a circuit or can we take different directions in different loops? If we must take ...
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3answers
62 views

RC filter on a clamping circuit

I have designed a clamping circuit to protect pins of my microcontroller and I have to add a low pass RC circuit at the microcontroller end to filter out the high frequency noise. My circuit analysis ...
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1answer
66 views

Help Running Xmas Lights On 6V AC Flying Saucer

first time here. First I will explain what I have then ask for a solution to my problem... I have a fiber optic UFO display that has a slow turning electric motor to revolve a color wheel to light ...
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RC high pass Circuit Step Input why C Initially acts as SS

In RC high pass circuit when you apply a step input the capacitor doesn't have any drop initially. My professor's justification for the question was that the capacitor doesn't change voltages ...
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1answer
83 views

Diodes and CMOS 4060 (14-stage counter)

Take a look at this popular circuit for a fridge alarm based around the 4060 binary counter (http://free-electroniccircuit.blogspot.co.uk/2012/02/refrigerator-alarm-schematic.html): One thing I ...
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1answer
246 views

Not sure if my calculation is correct, can anyone check this RC circuit for me?

Hello everyone, so in my book I decided to do this practice question but failed to notice that the answer was not given in the back of the book. If anyone can help me confirm my answer I would much ...
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0answers
61 views

Why does this State-Variable low pass filter overheat when turning up resonance?

I am trying to build an audio-frequency state-variable resonant filter. Power supply is ±15V. The circuit contains three TL072 op-amps and three LM13700 OTAs. It receives audio input from -2.5V to ...
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1answer
41 views

Norton Method Problem

$$ I = 1.43 \mu A \space \space R_p=1.8M\Omega \space\space R_s = 17k\Omega$$ I am trying to find the Norton current. This seems like a simple problem, but I keep getting it wrong. I tried using ...
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1answer
81 views

Component usage in this constant-current source circuit

In the April 2014 edition of Elektor magazine, they present a circuit for a high-precision current source device (page 42). It allows the user to select a constant-current between 10nA and 20mA. They ...
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2answers
148 views

A cubical LC circuit

I would like to solve for currents through inductors and the voltage across capacitances of the attached circuit. I am trying to figure out a correct method to solve such circuits which could have the ...
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41 views

Need help deriving cutoff frequency of output (collector) RC network

According to the book I'm studying, the cutoff frequency for this circuit is given by $$f_c=\frac{1}{2\pi(R_C+R_L)C_3}.$$ I tried to derive it by solving for the frequency at which \$V_{out}\$ is ...
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1answer
59 views

Simple RC Circuit, switch position

Most textbooks use this circuit as an example of the most basic RC circuit. The solution for V(t) for this circuit is (if capacitor is initially uncharged): I've had an exam recently where the ...