Tagged Questions

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

learn more… | top users | synonyms

-6
votes
0answers
25 views

How to analyze this MOSFET circuit? [on hold]

Here is the problem: Assume λ = 0.
-1
votes
1answer
57 views

Analyzing MOSFET circuit

Here is the problem: And here is my solution and I want to check if it is correct or not: ...
0
votes
0answers
32 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
vote
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
votes
1answer
40 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
vote
1answer
28 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
vote
1answer
44 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
52 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
vote
1answer
21 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
vote
4answers
418 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.
-2
votes
0answers
38 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
votes
0answers
69 views

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), ...
0
votes
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 * ...
-4
votes
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
votes
0answers
42 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
votes
5answers
97 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?
0
votes
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
vote
1answer
55 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
107 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 ...
0
votes
0answers
23 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
votes
1answer
66 views

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

simulate this circuit – Schematic created using CircuitLab How would I solve ...
2
votes
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
votes
2answers
96 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
votes
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
votes
1answer
29 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
votes
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
votes
0answers
69 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
votes
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
95 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 ...
1
vote
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
votes
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
votes
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
votes
0answers
35 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
votes
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
votes
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
votes
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
votes
2answers
58 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
votes
0answers
44 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
293 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
votes
0answers
145 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
votes
1answer
58 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
votes
1answer
91 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
votes
3answers
89 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 ...
3
votes
1answer
76 views

Question related to Cascode Circuit

I am trying to solve the following question related to cascode circuit. Where T5 has Vbe=0.7V I have answered the questions as follows. - Explain how the circuit works? The circuit has a DC ...
2
votes
5answers
124 views

Calculating output impedance of Vbe multiplier

I am trying to calculate the output impedance of the following Vbe multiplier, simulate this circuit – Schematic created using CircuitLab I have calculated the Vout = 4.2V and now I am ...
0
votes
2answers
70 views

Expressing dependent current source voltage using KVL

I am reading about mesh and node equations, and the book says that the voltage between \$V_1\$ and \$V_2\$ can be expressed as: $$ 10\cdot I = V_2 - V_1 $$ How is this possible? And is there a ...
2
votes
3answers
535 views

How do I find the resistance between three terminals?

I'm trying to self-study this problem and I found a bizarre problem with an unusual circuit. I have never faced this in all the problems that I have solved. What do they mean by finding the ...