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

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22 views

Why is this a 7th order circuit?

This is the circuit: I saw it in a book. It said that this is a 7th order circuit. From theory we know that the order of passive circuits is determined by the sum of capacitors and inductors, ...
3
votes
1answer
80 views

Is there a software program that calculates the Transfer Function for a given circuit? [on hold]

I'm asking for a program (either freeware or not) where you can draw your circuit as the input, as it happens in PSPice, Multisim, LTSpice etc.., then specify two nodes of reference, say \$ V_{out} \$ ...
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2answers
37 views

Importance of phase angles when analysing AC circuit

Freshmen EE circuit. Resistance, inductivity, capacitance are given and effective value of voltage. No phase angles are given. When calculating complex power, may I assume the phase angle of the ...
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1answer
18 views

Forming Norton generator from a voltage source and two resistors

Can I combine the E,R and Xl to form a current generator, with R and Xl in parallel. I need to find the impedance of Z so it develops most power, R-jX, or Z*, if Z is the impedance of the rest of ...
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0answers
81 views

Mathematical relation between these two signals

What is the relation between V4 and V3 ? I don't know what to do with diodes. This is not a homework, I need to find the equation between V4 and V3 for my own project. diodes are 1n4001 and the opamp ...
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2answers
71 views

I2C Bus is Not Responsive When Engine Is Running. How to Diagnose and Fix?

I've got a solder-less bread-boarded prototype microcontroller with a few I2C devices that take some measurements on a motorcycle. For now, The MCU is powered by a LM7805 with decoupling caps near the ...
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0answers
24 views

Power flow on branches using matrix algebra

Having: S: The vector of power injections at each bus. V: The vector of bus voltages. Y: The circuit admittance matrix. A: The branch-bus connectivity matrix. ...
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1answer
38 views

Calculating Transfer Function of passive circuit

I have the following passive circuit: I want to calculate it's transfer function \$V_{out}(s)/V_{in}(s)\$. My thoughts are: Part I: The voltage on the capacitor in the center (call it \$V_c(s)\$) ...
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1answer
46 views

Interesting property of Op-Amp. It Inverts Transfer Function of the system in it's feedback

This is a theoretical question. I saw this circuit somewhere: System (a) has transfer function: \$H(s)= V_{out}(s) / V_{in}(s)\$ And it stated that when system (a) is put into system (b) in the ...
1
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1answer
59 views

Question about Circuit Analysis

This is my first question of Electrical Engineering SE. I have the following circuit. I want to calculate it's transfer function, considering ideal Op amps and circuit elements. I have almost ...
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2answers
70 views

Mystery circuit with a functional description

Im trying to understand the following circuit and its cryptic functional description. How does this circuit work? I especially struggle with the following things: What is DEC8(blue)? Standard ...
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2answers
38 views

Current between batteries facing wire with same pole

I have just started learning about electric circuits, so I hope you'll be patient :) I am trying to solve for the current \$I\$ in the problem below, but (after much googling and reading) I cannot ...
2
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1answer
54 views

Homework: DC circuit help

I need help with the following problem: Find range of resistance R4 and voltage U4 so that the range of current I is $$I \in [-3A,-1A]$$ E=5V, E4=6V, Ig=1A, Ig4=-3A, R1=2ohm, ...
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2answers
73 views

Why is there a 66 Vac reading on the metal shield of our AC socket?

Today, out of curiosity, I took a measurement between the water pipe (presumably to be ground) and an exposed area of the AC socket with metal shielding (supposedly to be ground as well), and got an ...
0
votes
1answer
102 views

Analyzing resistive circuit with ideal diodes

The circuit is this: The diodes are ideal. The solution for this question is D1 OFF and D2 ON, and hence current \$I = 3mA\$. But when I assume that both D1 and D2 are OFF, I am not able to prove ...
0
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1answer
55 views

Capacitor grounded between 2 resistors

This is part of a segment of a design I came up with using schmitt triggers as relaxation oscillators. The picture below shows the 4 possible states of the circuit at any given time. Basically, the ...
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1answer
68 views

Basic Circuits Problem

Hey guys I'm new here and just need some help with a problem for my EE class. I need to find the maximum power that can be delivered to the variable resistor R. If you could walk me through the steps ...
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2answers
36 views

Quick question about phase displacement in AC circuits

Z1, Z2(impedance) and the effective value of I2 is given. My question is whether I can assume phase displacement of the current I, let's say 0º. I can finish the analysis of the circuit easily this ...
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3answers
135 views

Short analysis of AC circuit

simulate this circuit – Schematic created using CircuitLab For this AC circuit it is known that $$\omega=10^4 \text{rad}/\text{s},L=0.1\text{H}$$ Find capacity of a capacitor, so that the ...
0
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1answer
56 views

Filter behaving as oscillator

I've built a state-variable filter, to this schematic: R6 and R7 are a dual gang potentiometer (with the 3rd terminal unconnected, so variable resistor), and R2 is a single gang potentiometer ...
0
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1answer
54 views

What's the purpose of this voltage noise test circuit?

Ran in to this circuit from parts.io tweet. This is my analysis of it thus far: It is using TI's MC33078 OP-AMP. It is a dual OP-AMP, but in the example only half of it is used. The name of the ...
2
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0answers
94 views

Is it right to apply superposition theorem to the RC circuit with non-zero initial capacitor voltage?

I'm having confusion with applying superposition to simple RC circuit with non-zero initial capacitor voltage. Consider a simple RC circuit series connected with voltage source of step voltage ...
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1answer
59 views

Signal Detector (UHF Field Strength Meter)

after some reading I ended up finding a relatively basic FSM, using a antenna, an LC circuit to tune to a specific frequency, and a RF diode and final a ammeter to measure signal strength. My target ...
2
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1answer
100 views

Analysis of an Op-amp circuit

I saw this circuit and I want to find the relation between Vin and Vout. Assuming ideal Op-Amps, If VB>0 then the diode will be ON and A2 acts as a buffer so VB must be equal to the voltage of ...
0
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1answer
68 views

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. ...
2
votes
1answer
186 views

Norton's and Thevenin's theorems importance

Are Norton's and Thevenin's theorems used in real life? And in which situations? I'm reading a circuit analysis book and I asked myself: do electrical engineers use these theorems to get current and ...
0
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1answer
31 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
177 views

what is Rail to Rail supply? [closed]

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
51 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
54 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 ...
0
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1answer
39 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 ...
0
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1answer
43 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?
2
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1answer
43 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
65 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 ...
0
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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
78 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 ...
0
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1answer
137 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. ...
0
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1answer
100 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
61 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
votes
1answer
37 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 ...
0
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1answer
27 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 ( ...
0
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1answer
87 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, ...
0
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1answer
101 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
66 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
59 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 ...
0
votes
1answer
51 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 ...
0
votes
1answer
54 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 ...
0
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2answers
80 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
51 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
136 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 ...