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

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2answers
47 views

Solving a Thevenin equivalent circuit

Suppose \$R_{1}\$ and \$R_{2}\$ are replaced by resistors of unknown values which are different from those assumed in part (a). Using a variable external voltage source, a student applies \$+1.5V\$ ...
0
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2answers
69 views

Electric current of inductor

I have a homework problem that was solved by our instructor: "Calculate the electric current of the inductor at \$t=0^+\$." He calculated \$1/30\$ but the answer sheet was says \$-1/30\$. Which ...
0
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0answers
60 views

How can I create a circuit in another dimension from my circuit

I have a 9V battery and would like to use it as 5V. I tried a voltage regulator but, as far as I know, it takes too much power from the circuit. My idea, is to do the following: First I want to drop ...
0
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2answers
124 views

Finding the voltage and charge across capacitor

Can someone help me find the voltage and charge across each of the capacitors? This is not just a simple/ parallel circuit so I am having a problem in formulating the right equation on how to find the ...
3
votes
1answer
60 views

Basic Filter Design

Need help with basic filter design. Firstly there is a low-pass filter(pictured below). I am supposed to derive an expression for the amplitude of the output voltage as a function of \$R_1\$, ...
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1answer
69 views

Analyzing MOSFET circuit

Here is the problem: And here is my solution and I want to check if it is correct or not: ...
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0answers
64 views

darlington emitter follower

I assume it's known that voltage gain from two transiators in bjt darlington follower emitter are: \$ A_{V1} \approx \frac{1-h_{ie}}{A_{i_1}R_{i_2}} \ \ A_{V2}\approx 1-h_{ie} \$. Now in the text ...
1
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1answer
30 views

Mechanical- Electrical circuit equivalence

Is this the right electrical circuit equivalent to the mechanical? simulate this circuit – Schematic created using CircuitLab
2
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1answer
45 views

Transducing a changing capacitance

I have a capacitor C which changes with time. Now I want to measure the varying capacitance as a voltage function, so I need to design a circuit for that. My motivation around the problem is that, I ...
1
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1answer
31 views

Norton's Circuit of dependent source

I want to know whether the two circuit given are equivalent? Explicitly I want to know when can we use Norton's transform for dependent source? simulate this circuit – Schematic created ...
1
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1answer
46 views

voltage Gain in BJT

I am reading the book: Problems & Solution of Electronic Devices & Circuits, and on page 119 I got stumped. They write that : $$A_V = A_I \cdot \frac{Z_L}{Z_i}= \cdots = ...
2
votes
3answers
57 views

Norton's theorem application problem

The first image shows the circuit we start with. The second image shows the circuit in which I had the load removed (as I know from Thevenin's theorem). After that I'm getting confused because of the ...
1
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1answer
27 views

Output frequency of bistable multivibrators

I was wondering if there was a way to determine why the output frequency is half the value of the input frequency based on the schematic. I am currently learning about multivibrators in the Navy and ...
1
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4answers
428 views

Purpose of 2 resistors in high pass filter?

In the picture below, what is the purpose of R1? Compared to a high pass filter with 1 resistor, how does this affect Fc? Thank you.
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0answers
39 views

In the following circuit (in the image), find the current through Z2?

The underlined symbol means it's a complex number. Es are voltage sources. Js are current sources. Zs are impedances. I don't know how to deal with current sources while solving circuit So please ...
0
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1answer
105 views
+50

How to cascade transformers?

I'm currently working on a project were I need to cascade several transformers (the core we use does not nearly work as good as it ought to..). I'm using the equivalent circuit shown in (A), ...
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0answers
39 views

How to analyze this diode circuit (zener regulated power supply)?

My solution: a- Full-cycle rectifier. b- V1(max) = vs(max) - VDo = A - Vdo = 15sqrt(2) - 0.7 = 20.5 v c- Vo = Vz = 15 v. d- Vr = Vp * T / 2RC = (15sqrt(2) - 0.7) * (1/60) / 2 * 100 * 1000 * ...
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0answers
17 views

modelization of half wave rectifier to a dc motor [duplicate]

we have half wave rectifier connected to a dc motor load. by using a step down transformer from 8 to 1. by modalization we have the Primary Winding resistance is Rp=50 ohm and it's Lp=0.1 H the second ...
0
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0answers
43 views

half wave rectifier connected to a dc motor

we have half wave rectifier connected to a dc motor load. by using a step down transformer from 8 to 1. by modalization we have the Primary Winding resistance is Rp=50 ohm and it's Lp=0.1 H the ...
0
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5answers
101 views

Circuit Simplification

Calculate the current shown by the ammeter. simulate this circuit – Schematic created using CircuitLab How do we solve this using delta-wye transformations?
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1answer
66 views

What happens if we swap these two components?

So, in what looks like an attempt to explain mesh currents, my book has the following diagram: Then it proceeds to convince us of the veracity of several equations. The first of them makes sense: ...
1
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1answer
59 views

Analyzing a circuit with diodes connected in series

This is a problem with its solution: What I don't understand is how he replaced the three diodes with the voltage sources in DC-analysis or with the resistances in AC-analysis. What assumptions ...
2
votes
3answers
112 views

Non ideal op-amp equivalent circuit output voltage

I am creating this question to ask you about a "strange" behavior I am observing in Matlab about an op-amp circuit. I am reading "Fundamentals of Electric Circuits" the 5th edition, and in the chapter ...
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0answers
25 views

transient analysis in aim spice

How do I carry out the transient analysis of series RLC circuit using AIM Spice? I can't figure out what values should be given for step size and final time. Also, I was seeing some tutorials and ...
0
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1answer
68 views

How to solve this circuit using mesh analysis? [closed]

simulate this circuit – Schematic created using CircuitLab How would I solve ...
2
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1answer
47 views

How did my calculation become Erronous?

So I have this node voltage equation problem. Seems really easy, actually. simulate this circuit – Schematic created using CircuitLab In fact, this appears to be only one equation, ...
0
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2answers
97 views

Why don't over damped and critically damped circuits oscillate?

The reason underdamped LRC circuits oscillate is because the energy keeps flowing between the inductor and capacitor. The energy is being constantly exchanged between the capacitor and inductor ...
0
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1answer
36 views

Analyzing input/output characteristics of a diode circuit

In "Fundamentals of Microelectronics" textbook. The question number 27 of chapter 3 is: The part b of the question is: And the solution of b from the solution manual of this textbook is: Can ...
0
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1answer
31 views

How do I find the equivalent resistance using symmetry?

I know this could be solved using delta-to-y transformation, but I want to solve this using symmetry. Considering the middle line the symmetry axis this becomes: simulate this circuit ...
3
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1answer
151 views

Analyzing circuits with diodes

In "Fundamentals of Microelectronics" textbook. The question number 25 of chapter 3 is: This is part c of the question: And this is the solution of part c from the solution manual: For the ...
0
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0answers
71 views

Input/output characteristics for this diode circuit

Given this circuit: Assume VB = 2V, constant-voltage drop model, and VDo = 0.7V. How to plot input/output characteristics? Here is my try: When the diode is on, we replace the diode with a ...
0
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2answers
52 views

What is the error in my analysis?

So, I am to analyze this circuit. So, this seems easy enough: Node 3: \$v_3=20 \space \mathrm{v}\$ Node 2: ...
1
vote
1answer
53 views

Photointerrupter issue

I have circuit with photointerrupter GP1S092HCPIF. The documentation is rather weak and D-shape pin strange but I need a small SMD type. I hopefully identified pins correctly and when soldered on ...
0
votes
4answers
104 views

How to measure DC Operating Point of a simple transistor circuit

Could someone explain to me how to find the DC Operating point of this circuit? I need to find it by running a simulation and probing the circuit, not solving for it mathematically, and I'm not sure ...
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3answers
61 views

Analyzing a circuit with diodes

In this circuit: Assuming ideal diodes We have 8 combinations of assumptions. I have proved that 5 of them are wrong. The three remaining assumptions are: All diodes are on. D1 is on, D2 is off, ...
2
votes
4answers
184 views

How to calculate Vx in this circuit?

In this circuit: Assuming ideal diodes We are required to calculate VD1, VD2, ID1, and ID2. If I assume that D1 is off and D2 is on which is a wrong assumption (as I think). How I prove that it ...
0
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0answers
46 views

Relay is not isolating properly its sorrounding circuit blocks

It turns out I've been building up an elevator for a project (at College). In general terms, everything appeared to be correct, regardless that I hadn't simulated each part. I decided to begin with ...
0
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0answers
18 views

Can't find TEC between nodes 'a' and 'b' correctly

I'm currently learning Thevenin's Theorem and it seems that I can't solve the easiest problem in this chapter. How I tried to solve: (a) The node a being positive and node b negative, doing ...
0
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0answers
36 views

Problem on finding the charge transferred and voltage between capacitors

The goal here is to solve for the voltages between capacitors (i.e. voltage in C1, Cx, C2 and CL). I am aware that during this time the Voltage in C1 is equal to the node voltage at node A because it ...
11
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3answers
719 views

How do I do basic circuit analysis with resistors rated in watts instead of ohms?

In my electrical circuits class, we've spent the last six weeks learning circuit analysis with resistors rated in ohms. Now, out of the blue, every question on the next practice exam has the resistors ...
0
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0answers
39 views

Source transformation: my analysis technique is off somehow

I am having a real hard time with these problems, I understand how to use ohms law to transform voltage sources in series with resistors into current sources in parallel with said resistors. For ...
0
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1answer
79 views

OP AMP circuit analysis question?

I've been trying to figure this out for a while to no avail. Could someone help me out? So far I've tried computing KCL around a couple of different nodes but wasn't able to get a model describing ...
0
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2answers
59 views

What happens when I connect an LC circuit to only the positive terminal of a voltage source?

I have the following circuit: simulate this circuit – Schematic created using CircuitLab The switches flip at the same time. In the position shown, SW1 is causing a loop that only ...
0
votes
1answer
52 views

What is the current flowing through this switch?

I am looking at a circuit diagram like this: simulate this circuit – Schematic created using CircuitLab Switch 1 and switch 2 never are on at the same time (they alternate) I turn on S2 ...
0
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0answers
46 views

On a triangular wave integrator calculation

New to this, so I am just trying to see if I got this correct. I am given a square wave where the length of the "top" of the square is \$T\$. That means the period is \$2T\$. I know that to get ...
2
votes
3answers
321 views

Diode Logic Gates

For some reason, I understand transistor logic gates, and I am able to solve problems, but for some reason I do not understand the and / or logic gates constructed by diodes. If someone can explain it ...
0
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0answers
147 views

Calculating the resistor's power consumption of 1 ohm in watts

I ran into a old-midterm exam question that calculate the one-ohm resistor's power consumption in the following diagram in watts? I need some solution or hints. I try to solve it but I think the ...
0
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1answer
61 views

AC switch & power supply reverse engineering

Below is schematic of self-powered(by passing little current not enough to operate) switch reverse-engineered from PCB. simulate this circuit – Schematic created using CircuitLab Zener ...
0
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1answer
96 views

resistor doesn't make a difference connected across a supernode, why?

I'm using KCL to analyse the circuit that has a voltage source between two non-reference nodes connected in parallel with resistor R3. I'm regarding the voltage source and the resistor as a ...
0
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3answers
90 views

Why is the voltage across the inputs of an ideal OP Amp zero?

The property that the voltage across the inputs of an ideal OP Amp is zero cannot be taken as an axiom because it isn't a property you can directly "adjust" (as opposed to say the resistance across ...