Questions tagged [circuit-analysis]
Circuit (Network) analysis is the process of finding the voltages across, and the currents through, every component in the network.
5,306
questions
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1answer
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Working of a clamper circuit
I was reading about the clamper circuit on wikipedia and found this below image for a positive clamper circuit.
My question is
During the positive (Rising/increasing portion) half of the input AC ...
0
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1answer
31 views
What does it mean to have a large time constant of a RC network than the time period of an input AC signal
What does it mean to have a large time constant of a RC network than the time period of an input AC signal?
Can someone tell me how to understand this and what sense does it make?
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0answers
22 views
Method to convert LTspice model to SIMPLIS
Is there a method that converts an LTspice model directly to SIMPLIS? Format for SIMPLIS is 'sxsch'
2
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3answers
276 views
Equation (mathematical function) of ramp signal vs saw tooth signal
I have a sawtooth current source whose peak value is 1A. 0A to 1A. with a frequency of 1kHz.
This current source is going to charge a 1F capacitor, so I was trying to find the equation for the current ...
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0answers
40 views
Why doesn't my Wien bridge simulation work?
I'm trying to infer the design of a simple device that is made from a resistor and a capacitor for which I have specifications, but not access to the device. I don't know if the device has the ...
1
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1answer
42 views
Driving Relay using ESP-01 Module
I am trying to control a 5V relay with a push button with an indicator LED using GPIOs 0, 1 and 3. I have pulled up the GPIO0 and using it as output, so that when I drive it low, the LED should glow, ...
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8answers
235 views
A circuit cannot contain two different currents in series; otherwise KCL will be violated
I'm currently studying the textbook Fundamentals of Electric Circuits, 7th edition, by Charles Alexander and Matthew Sadiku. Chapter 2.4 Kirchhoff's Laws gives the following example:
Kirchhoff’s ...
5
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3answers
769 views
Controlling Relay using ESP8266 Module
I have 5 such relays attached to an ESP-12E module with a 600ma Power Supply. The LED (LED4) glows but the relay doesn't switch. Is there anything wrong with my schematic?
Using MMBT3904 instead of a ...
14
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5answers
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Can I get help troubleshooting a simple hobby electronics circuit? Multimeter not measuring current drawn
I am following the experiment in the popular electronics book - "Make: Electronics third edition". However, when replicating one of the experiments mentioned in the book (specifically ...
4
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2answers
271 views
How to derive the below equation
First, I would like to verify is the circuit I drawn correct? Rin is consider large enough to be negligible in the equation.
I tried using KVL to obtain 3 equation as below, considering to get vth ...
2
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2answers
92 views
How to compute S21 when port 1 and port 2 reference impedance (Zo) are different
The attenuator given in the figure is a 6 dB attenuator when both port 1 and 2 have a reference impedance of 50 Ω.
Then, their S-parameter matrix (when port 1 and 2 have 50 Ω reference impedance) ...
5
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2answers
106 views
Determine \$i_L(t)\$of the RLC circuit
I have an RLC circuit that I am supposed to solve using s-domain analysis and I have gotten stuck when trying to transform back into time domain.
I utilized node voltage analysis to determine the ...
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2answers
82 views
Find RL circuit average power when no AC amplitude is given
I am asked to find the average power of this RL circuit, assuming that \$R\$, \$L\$ and the frequency (\$\omega\$) and phase (\$\phi\$, can be zero) are given. But nothing is said about the amplitude \...
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0answers
82 views
Is this a Moore or a Mealy machine?
I'm learning circuit design for the first time and I've designed this circuit. I am having a hard time deciding if it's a Moore or Mealy machine from my current understanding.
The yellow "logic ...
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3answers
105 views
How to derive the transfer function of this op-amp?
For the 1st question, is this a Sallen-Key filter? What criteria must a circuit possess in order for it to classified as a Sallen-Key filter? I searched the internet but found no clear answer.
For ...
4
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4answers
369 views
What is wrong with this circuit analysis?
I have a super simple question about using superposition to solve this circuit and it looks like I am running into a misconception about why my analysis is wrong. Any help would be appreciated!
I have ...
0
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1answer
53 views
Ultrasonic transducers driver review (25KHz 150Vp-p)
Transducers specs:
Resonance frequency = 25 KHz +/-1KHz
Maximum driving voltage = 150 Vp-p
Capacitance = 2.4nF +/-20%
Proposed driver circuit and simulation:
Seven transducers are driven for a total ...
1
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1answer
60 views
Frequency of a sequential circuit
I'm reading the book Digital Design and Computer Architecture. I came across this exercise:
From what I've learned so far, the frequency of a circuit is the reciprocal of the clock period. Since we ...
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0answers
63 views
What would the output waveform be in each of these cases?
In the second picture, the source is a step function from 0 to 1V.
I feel like I solved them, but I am not convinced that my understanding is air-tight. Any help is appreciated.
Edit: Adding my ...
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2answers
84 views
How to determine an equivalent RC circuit of a black box?
I've been given information about a "black box" device that I know is made of a simple combination of resistors and capacitors, and I've been asked to determine an equivalent circuit. I ...
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0answers
59 views
Computer SMPS overload protection and Low current shut down [closed]
What i have :
i have a zebronics 450w smps (those generic things like this)
.
*which is rated for 12 v 15a max
*it is a old PC so now I dont need it anymore, so I decided to take the psu out and turn ...
1
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1answer
96 views
Cascode BJT amplifier DC analysis assumption
simulate this circuit – Schematic created using CircuitLab
I am working on the DC analysis of a cascode amplifier.
If I assume base current is negligible I get the following equations:
From ...
0
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0answers
54 views
How does this JK flipflop work?
Could someone explain to me how the impulse diagram of this circuit works?
I don't understand the inputs in the JK flip flop. Why does J start with 1 ?
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0answers
39 views
Measure dynamic comparator's offset voltage
I'm trying to characterize a comparator I built and I am wondering how I can plot offset voltage over time. I would like to eventually add a calibration block that will reduce the comparator offset ...
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0answers
34 views
Calculate how many conditions it need [closed]
It will have 6 states, 2 bits of input, 4 bits of output, assuming no restriction on Input,
use sequential assignment
How many don't care conditions can you have in optimization? And how to solve it?...
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2answers
81 views
Is this "definition" of "independent loop" even logical / a valid definition?
I'm currently studying the textbook Fundamentals of Electric Circuits, 7th edition, by Charles Alexander and Matthew Sadiku. Chapter 2.3 Nodes, Branches, and Loops says the following:
A branch ...
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0answers
25 views
Find The Power in 12 ohms Using Norton's Theorem [closed]
Find The Power in R12 Using Norton's Theorem
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0answers
21 views
Why output voltage of the boost converter depends on current only in DCM not CCM?
I read this and understood all the derivation for the output voltage, average inductor current for the boost converter in CCM and DCM operation. However, it's not intuitively clear to me why DCM ...
4
votes
3answers
705 views
Mistake in using KVL and KCL in ideal opamp-circuit
I have the following circuit:
simulate this circuit – Schematic created using CircuitLab
And I used KCL and KVL to write the following sets of equations:
$$
\begin{cases}
\text{I}_0=\text{I}_1+\...
2
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1answer
109 views
BJT saturation voltage too big: not in saturation? (in the MC34063 chip)
EDIT at the bottom.
Referring to a previous question which I solved, it was related to a inverting boost configuration of the MC34063 with the following arrangement:
I realized my circuit and ...
0
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2answers
61 views
CT showing different reading at phase and neutral
simulate this circuit – Schematic created using CircuitLab
I have attached a simplified version of my test circuit. When the current transformer is connected to the neutral side like in the ...
0
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0answers
34 views
Combining S-parametric Blocks
I would like to ask you, please, how I can combine general S-parametric blocks together. Consider the situation in the following picture.
Considering this example, I would like to connect these three ...
2
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1answer
89 views
Derivation of Formula for Power
The power dissipated by a resistor can be written as $$V(t)I(t)$$ where both the voltage and current can vary with time. I don't understand why the formula is not
$$\frac{dW}{dt}=\frac{d}{dt} (Vq) = \...
0
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1answer
42 views
Electric field in a circuit and potential drop
With reference to the above image:
Here the battery produces a constant (will it be constant? pl. explain) electric field across the length of the wire, lets say its value is \$\vec E\$ . This field ...
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0answers
57 views
What is the reasoning for the presented equations? How do they relate to "nodal analysis" and figure 1.21?
I'm currently studying the textbook Fundamentals of Electric Circuits, 7th edition, by Charles Alexander and Matthew Sadiku. Chapter 1.7 Problem Solving gives the following example:
Example 1.10
...
0
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1answer
113 views
Zero-cross detector does not detect all the zeroes
I'm trying to do a zero-crossing detector but it is only able to mark half the number of zero passings. It seems to work fine with input voltages of 10-20V, but when using a +120VRMS it checks only on ...
4
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4answers
204 views
How does one know that the current is flowing downwards through the \$8 \ \Omega\$ resistor?
I'm currently studying the textbook Fundamentals of Electric Circuits, 7th edition, by Charles Alexander and Matthew Sadiku. Chapter 1.7 Problem Solving gives the following example:
Example 1.10
...
1
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2answers
71 views
Calculate the integral of a saw tooth wave
My question is with reference to this question over here
Suppose, I have a saw tooth current source with peak value from 0A to 1A with a frequency of 1kHz and I need to calculate the charge of the ...
1
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2answers
56 views
Why is the polarity of the \$3 \ \text{V}\$ source necessary to calculate the current flowing through the \$8 \ \Omega\$ resistor?
I'm currently studying the textbook Fundamentals of Electric Circuits, 7th edition, by Charles Alexander and Matthew Sadiku. Chapter 1.7 Problem Solving gives the following example:
Example 1.10
...
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2answers
132 views
How can I solve this opamp circuit?
I am designing an Analog Front-End circuit for an NTC Sensor which has 3 parts, the non inverting stage, the low pass filter, and goes to seeeduino.
Basically the input voltage is 5Vcc and I need to ...
1
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1answer
44 views
Solution Verification: Thevenin Equivalent with Dependent Voltage Source
I am currently self-studying through MITs 6.002 Spring 2007 course. There are currently no solutions for the assignments afaik. Normally, this isn't an issue, but I am having some trouble with this ...
1
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2answers
122 views
What are the caveats in this circuit design?
My question relates to the circuit in the image below. I have a non-inverting amplifier that generally will need to operate as a buffer (voltage follower) after a low pass filter to give a low ...
1
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1answer
93 views
Can FPGA logic be represented by a matrix/sequence/chain/expression?
There is an interesting paper from our chemistry peers, where they achieve to represent molecules into a sequence of characters. This obviously inspired me to think that there must be something ...
10
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5answers
1k views
How to compensate noise at the output of logic gates?
I am simulating 74HC logic family on LTSpice.
The output of inverters and D-Flip-Flop are normal, but the output of NAND and AND are noisy
.
How can I compensate or filter that noise?
What kind of ...
0
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0answers
15 views
Source Transformation Finding TEC
I have been trying to find the thevenin equivalent circuit with respect to nodes a and b using source transformation. I end up having this setup. What would possibly be the next step I should do? Can ...
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1answer
37 views
What is the I_R current for this avalanche photodiode?
This is the datasheet of the APD I got.
There's 'I_R' at test condition for breakdown voltage.
What is this current I_R?
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2answers
37 views
APD (avalanche photodiode) responsivity problem
I'm experiencing a few problems with responsivity of APD (model: First Sensor AD500-8-S1).
This is the circuit I tried to make.
Just simply apply voltage (positive polarity) to the cathode for ...
0
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6answers
138 views
Average value and RMS value
I am trying to understand the concept of RMS value.
From whatever I have read and the tutorials I have seen, I have seen them derive the RMS value only considering the first positive half cycle of the ...
1
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1answer
58 views
RL-circuit using Laplace
I have a series RL circuit (with zero initial conditions) and I want to find the voltage across the inductor. The formula I got is:
$$\text{V}_\text{L}\left(t\right)=\int_0^t\text{V}_\text{in}\left(\...
2
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3answers
129 views
What is the invisible layer between Boolean algebra and the physical circuit of a computer, and how to understand it?
How is Boolean algebra implemented through a circuit ?
Is it just a way of thinking about a circuit? You don't need Boolean algebra to think about a circuit since it is made of physical components, ...
