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

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Circuit similar to current divider

This is a circuit with a general, unspecified logic gate fed by a battery. The series \$ L \$ and \$ R \$ represent the wire which carries the current from the battery to the logic gate. ...
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1answer
42 views

Norton's and Thevenin's theorems

Are Norton's and Thevenin's theorem used in real life, in which situations? I'm reading Circuit Analysis book, and I asked myself do electrical engineers use this theorems to get current and voltage ...
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58 views

Please, check my solution of RC circuit

I have solved a problem, but I am not sure if it is right. For me my solution seems to be too straightforward. I have tried using KVL and solving differential equation for current, but the final ...
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1answer
25 views

Finding the thevenin voltage

To my understanding the thevenin voltage is the potential difference between a fixed circuit and the ends in which we can add a load. I am going in circles with this problem. I was able to find the ...
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2answers
164 views

what is Rail to Rail supply? [on hold]

I am new to analog electronics and I have been hearing this word from my seniors they always talk about Rail-Rail supply while working on some amplifiers and Opamp,also while calculating and designing ...
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1answer
41 views

Can we apply Nodal Analysis to non planar circuits?

Can we apply nodal analysis to non-planar circuits the same way we apply nodal analysis for planar circuits? If yes how do we systematically apply nodal analysis? If no is there any alternate for ...
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3answers
51 views

Current and voltage direction in source-free RL and RC circuits

Question on obtaining the ODE RC circuits : Why is it that the current flows through the capacitor and the resistor when the voltage source is disconnected. Shouldn't it flow from the capacitor ...
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1answer
35 views

Source transformation problem

I have this problem with a source transformation sum that I can't find the answer to. What do I do after these steps? The question: My solutions: Can it be as simple as algaebric addition of ...
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0answers
24 views

SWR on a transmission line and its charactreristics

What does constructive and destructive wave interferance have to do with SWR on a transmission line? And does it explain the true behavior of transmission lines and SWR? Bonus points if you can answer ...
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1answer
38 views

Using Superposition Principle with Noise Sources

What are the conditions that the noise sources have, so that I can apply superposition principle to analyse the circuit having multiple noise sources?
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1answer
38 views

Transistor saw-tooth oscillator. Saturation issue using LTSpice

I'm currently designing a saw-tooth oscillator that should be frequency adjustable, I don't want to use potentiometers, so it has to be voltage controlled. The frequency is controllable in the circuit ...
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1answer
57 views

Is potential difference is sufficient for charge/current flow?

Suppose there are two points A and B. A is having fewer electrons than B. That is,it is positive with respect to B.If these two points are connected by conductive wire will the current flow? If this ...
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1answer
35 views

Delta-Wye Transformation of Capacitors

Homework: I am trying to wrap my head around converting a capacitor circuit into an equivalent capacitor. I have looked at resources saying that it is the same as delta-wye transformation of ...
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0answers
77 views

State Equations

Please can you help me in finding the state equations for the circuit below? My problem is the two capacitors. How will we cater for the second capacitor? I only know problems with 1 capacitor and 1 ...
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1answer
115 views

Two Port Circuit

I hope all are well. Please can you help me with the below, I have a idea of doing it but I am so confused in determining the correct ANSWER. I am using the linear and nonlinear text book by Leon O. ...
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1answer
96 views

Is there a difference between these two circuts?

simulate this circuit – Schematic created using CircuitLab I am trying to apprehend the concepts of "ground" in electric circuits. There are some excellent answers on SE here on this ...
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3answers
58 views

Sign of current through a voltage source

simulate this circuit – Schematic created using CircuitLab I am a total newbie to circuits, so please forgive my naivety. My question is the following: When I simulate the above circuit ...
2
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1answer
36 views

LT-Spice RL circuit simulation ill behaved current

I am trying to simulate a RL circuit in DC with LT-spice as follows: NOTE that the inductance is 0.0229 H although in the picture you see 229 Now, according to my calculation, what I would expect ...
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1answer
24 views

using TSOP4838 in anti-collision line follower

i want to use IR sensors with emitter part ( IR led ) - calibrated with an IC timer to give 38KHZ IR signal - mounted side by side - not face to face like the counter module - to the receiver part ( ...
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1answer
85 views

Solving a circuit using superposition (strange case)

My professor gave us a problem that we are free to do by ourselves that is a typical exam problem. I was wondering if half of my solution can be verified (the other half I am fine with). The circuit, ...
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1answer
82 views

How to analyze this circuit with resistors and capacitors?

I have to find out the value of \$V_{o}\$ and \$V_{c}\$ initially and finally of the this circuit when \$S_{1}\$ and \$S_{2}\$ switches are simultaneously closed. Edit: \$V_{c}\$ is across the ...
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1answer
62 views

help related to frequency of schmitt oscillator

I have seen the CMOS Schmitt waveform generator circuit (i.e. figure 2nd) from the following link http://www.electronics-tutorials.ws/waveforms/generators.html I tried to simulate the circuit in ...
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2answers
54 views

Help fixing Honeywell doorbell broken circuit [closed]

My Honeywell RCWL330A1000/N P4-Premium Portable Wireless Door Chime dropped to the floor the other day and has not worked since then. I unscrewed the casing an found a crack in the circuit board which ...
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1answer
45 views

Finding 2nd Vds value in a NMOS circuit

I think for the first part of this problem I solved for Ra = 13kohm and Rb = 7kohm, but I'm not able to understand or see how to get the voltage at the point V1. Any idea on how to go about finding ...
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1answer
51 views

Determine the currents in the following circuit

Here I have such a problem. I'm asked to determine the values of currents in this circuit(the circuit is in permanent sinusoidal regim). The double-sided arrow in the image represents the magnetic ...
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2answers
74 views

Does a constant current source add to existing current?

If I have a circuit where one branch contains a constant current source (e.g. 2A), does the current leading out of the current source equal the current leading into it (e.g. 4A) plus the current of ...
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0answers
47 views

Gain in common source amplifier

Let us consider the Common Source amplifier depicted below: We know that the gain \$A_v\$ of a such circuit is given by \$A_v=-g_mR_D\$, where \$g_m\$ is the transconductance of the MOSFET. We also ...
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3answers
134 views

BJT Circuit Base-Emmitter voltage

I don't understand, why the voltage V2 is approximately Vb. Can't V2 be 0, if Vb is enough high, so that the emmiter-current of Q2 is Ie2? The assistent only told me, that because both transistors ...
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2answers
125 views

Peltier circuit design for TEC

I'm designing a TEC circuit with a Peltier element, LM35 as the sensor and Arduino uno as the controller. I simulated it with Proteus and to my knowledge it was working, I suppose. But when I tried to ...
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4answers
54 views

Why does this circuit give different values for different methods

Is there a rule that I am missing? I need to find the resistance of this circuit: I seem to get different values depending on which way I take the resistors. Is there any rule I am missing when ...
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0answers
37 views

Active power of a circuit

In the below circuit \$Z_C=(10-j50)\Omega\$, \$|I|=2\$A. I have to calculate the active and reactive power in \$Z_C\$ simulate this circuit – Schematic created using CircuitLab ...
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2answers
63 views

When using nodal analysis of a circuit involving CCCS, how do you know which currents are entering and which are leaving?

I am trying to solve the following circuit: I believe the answer I'm getting for \$i_b\$ is wrong because I put it into LTSpice and I'm getting that \$i_b = -3.63636\$ This is my LTSpice diagram: ...
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0answers
26 views

Calculation of a current at règime

I have to calculate \$i(t)\$ at règime, by knowing that \$v_s(t)=2\cos(\omega t + \pi/2)\$, \$R=1\Omega\$, and that, at the generator frequency, \$X_c=-1\Omega\$ and \$X_L=1\Omega\$. simulate ...
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1answer
75 views

Why the voltage of supply got stuck when connected with leds?

I was working with some smd LED's trying to make their V-I curve. For that purpose, I connected two segments parallel to each other each containing two leds as shown, to a regulated dc power supply ...
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16 views

Redistribution of Flux Linkage in a Loop

This is a problem of Linear Circuit Analysis. We have to find the current through the inductors in t=0+. We can note that surely a impulsive current has to happen due to KLC on the left. How can we ...
2
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1answer
46 views

Calculation of a voltage in the frequency domain

The current generator provides a constant current \$I\$ and the circuit is at règime conditions. At \$t=0\$, the switch T is being closed. I have to calculate the voltage \$v_c(t)\$ by using the ...
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2answers
100 views

Prove the formula RMS = 2.22*average of for a half-wave rectified sinusoid with a zero average value?

I was wondering if anyone can clarify exactly how I am supposed to prove the formula above. If I try to verify my work as I have gotten, then I would have sqrt(2)/2 = 2/pi*2.22 which is not the case; ...
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3answers
56 views

circuit in neither series or parallel (is wye delta transformation necessary?)

I have been trying out this one problem and I just want to know if I am on the right track, because it feels like a large amount of work based on such a simple circuit and it is getting quite messy. I ...
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0answers
41 views

Capacitor at règime - Circuit analysis

In the below circuit I have to calculate \$v_u\$, as \$t\ge0\$. The given data is: \$E=4\$ mV, \$R_g=10 k\Omega\$, \$R=100k\Omega\$, \$C=1\mu F\$ simulate this circuit – Schematic ...
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3answers
66 views

Passive Convention Specifics With Regards to Resistors (Problem linked)

I was wondering how exactly passive convention works with respect to unlabeled resistors. In the problem attached, I realized you only get the answer if you label the resistor terminals one way, ...
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4answers
117 views

BJT Biasing with negative voltage

I got this question as a school assignment (1st year electrical engineering). I have to calculate the 3 unknown resistor values. The values which were given are in the schematic. Further \$\beta = ...
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2answers
58 views

Peer Review of Buck Converter

The only limitations I can think of are: Comparator/Schmitt not gate output swing time, and Transistor switching time simulate this circuit – Schematic created using CircuitLab BTW, ...
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1answer
42 views

Small signal analysis of MOSFET. Calculating Gain

I can do DC analysis and draw the small signal equivalent circuit just fine. I generally have trouble calculating gain. I'm having trouble understanding the answer to this question. This is the ...
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1answer
36 views

thevenin dependent source finding Rth

The answer is 16, but can anyone please explain how? note m is u I confused because, I dont know how to solve for Vx ? I know that once I find Vth and then resolve the circuit closed and finding ...
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3answers
45 views

Calculation of a voltage in a single mesh circuit

simulate this circuit – Schematic created using CircuitLab Why is \$v_{R_2}=(v_1-v_2)\frac{R_2}{R_1+R_2}\$ ? Could anybody show me this formula, please? \$(v_1-v_2)\$ is the voltage ...
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0answers
17 views

Simulate two-port networks in spice

I've been trying to simulate a circuit that includes a two-port network. While I was able to solve my problem using the T-model, I'm curious, how could I simulate a non reciprocal two-port network? I ...
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1answer
39 views

Relation of current with frequency and voltage

I tried to solve a numerical problem but I got stuck and I think it very necessary to have its solution. I will draw certain basic conclusions when I would found its solution. The question is: An ...
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1answer
77 views

Derivation of current gain and voltage gain for common base BJT

For a common base configuration BJT such as the one shown here: How can I derive the voltage gain and current gain?
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1answer
35 views

analog circuit nodal analysis

I had difficulty in evaluating following circuit's node analysis to find the transfer function. I had difficulty because of the ground in the middle of the circuit and the way the source voltage is ...
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1answer
15 views

initial state in s domain

in question below I couldn't' evaluate the initial state for inductors and capacitor in order to do the s domain analysis. If you can also show me how can I draw the circuit for inital state, I would ...