Questions tagged [circuit-analysis]

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

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40 views

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 ...
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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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Method to convert LTspice model to SIMPLIS

Is there a method that converts an LTspice model directly to SIMPLIS? Format for SIMPLIS is 'sxsch'
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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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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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) ...
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2answers
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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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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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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 ...
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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 ...
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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 ...
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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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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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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 ...
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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 ...
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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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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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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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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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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 ...
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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+\...
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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 ...
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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 ...
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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 ...
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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) = \...
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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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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 ...
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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 ...
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4answers
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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 ...
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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 ...
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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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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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
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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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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 ...
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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 ...
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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(\...
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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, ...

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