Tagged Questions

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

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1answer
24 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
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0answers
12 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
56 views

How to solve this circuit using mesh analysis?

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
81 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
30 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 ...
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1answer
22 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
145 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
58 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 ...
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2answers
50 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
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1answer
51 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
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0answers
25 views

How to determine resistances to bias BJT based on input impedance, output admittance, and beta of the BJT

I have been given this circuit, with a 2N2222A BJT. I know the input impedance of the BJT is \$ h_{ie} = r_{\pi} = 4k\$, I know the output impedance \$ h_{oe} = 1/r_o = 1/100k = 0.01{\mu}S\$ , and I ...
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4answers
71 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
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3answers
55 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
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4answers
174 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
42 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 ...
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0answers
16 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 ...
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0answers
33 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
711 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 ...
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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
76 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
52 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
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1answer
40 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
40 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
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3answers
180 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
138 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
51 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
77 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
86 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
71 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
111 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
60 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
518 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 ...
0
votes
1answer
76 views

How does this PMOS circuit work?

I've been trying to figure out how this PMOS circuit is functioning. B_VCC is 5V coming from a USB port on the board, while VCC5V is used elsewhere in a regulator to create 3.3V but otherwise does ...
0
votes
1answer
76 views

What's wrong with my answer finding the resistance?

This is the question and the solution: Here's my answer: My answer was incorrect, though I believe my analysis was correct. Can anyone point my mistake? I hope it's not with the signs.
0
votes
1answer
135 views

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
41 views

Phasors of power supply Vs1 in one example

I read one example in my note: If \$V1=1=+j2\$ and \$V2=12+j12\$, phasor of power supply Vs1 is: \$29+j59\$, but I couldn't get it. I think it's wrong and the solution is \$29+j57\$. Could anyone ...
0
votes
1answer
66 views

Source conversion [closed]

I have this homework problem, which our professor requires us to solve using Source Conversion. We have to find the current through R2 and through R3, and I don't have any idea on where to start. ...
1
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0answers
48 views

Trouble finding R in a super mesh

I am trying to find \$R\$ in \$R_5\$ via mesh analysis. I see that loops 1 and 2 are a super mesh, so then applying KVL to them I end up with: $$ 4\cdot(i_1-i_2) + R\cdot(i_2-i_3) + 2\cdot i_1 + ...
0
votes
2answers
43 views

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?
1
vote
2answers
103 views

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), ...
1
vote
1answer
110 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 ...
0
votes
1answer
71 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 ...
1
vote
3answers
78 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 ...
0
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1answer
32 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 \\ ...
0
votes
2answers
93 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 ...
1
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0answers
73 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 ...
2
votes
4answers
117 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 ...
4
votes
2answers
518 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 ...
0
votes
1answer
78 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) = ...