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

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Learning the Basics of Circuit Design

I am sure this question has been asked lots of times, but for the life of me I can't seem to find a related thread... Disclaimer aside, here is what I am struggling with: I have been a programmer ...
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55 views

How to figure out polarity of a polarized capacitor in a circuit

I've found myself a number of time trying to build a circuit from a schematics that does not provide any polarity indication for caps (probably because the designer used non-polarized caps in the ...
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49 views

Differences between current sources transistor and current mirror

In this configuration simulate this circuit – Schematic created using CircuitLab if the two pMOS are equal, they provide the same drain current to both the branches: suppose that Vbias ...
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2answers
162 views

STM32 Understanding GPIO Settings

In STM32 Standard Peripheral library, we need to configure the GPIO. But there are 3 functions which I not sure how to configure them; GPIO_InitStructure.GPIO_Speed GPIO_InitStructure.GPIO_OType ...
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30 views

analysis of RC circuit using Matlab

I designed the circuit and obtained the desired outputs correctly. for for circuit it R = 1e3 , C= 0.15e-6, and f = 250 , ( for RC circuit) and in the second part it asks to increase the frequency to ...
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25 views

Help solving a 2nd order RC with 3 inputs

I posted a couple of questions lately, all related to the same problem. Whether I had a suitable answer to the particular question asked or not, I tried everything I could think of* without any ...
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36 views

Nonzero initial conditions for a circuit solved using superposition theorem?

Suppose I have a linear circuit with 3 voltage sources Vin1, Vin2, and Vin3 in it, and one voltage of interest Vout. It's common practice to solve it using the superposition theorem, so this will lead ...
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56 views

static Hazard and challenging questions

i read some notes that wrote: for following Function F, has static Hazard, if B=C=D=1, and for each change in value of A, the Static Hazard 1 can be. Why this statement is True?
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48 views

how to redesign the circuit to drive a 230V 100W lamp for 5 minutes

I have a circuit , the circuit operates with a siren using a 9v battery the siren used is UM3561 i want to replace the alarm part of the circuit using a RELAy that can drive a 100W 230V lamp for 5 ...
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129 views

Why can't you divide a series + parallel circuit into branches to get total current?

Suppose we have a circuit like this where \$R_1 = R_2 = R_3 = 1\$ simulate this circuit – Schematic created using CircuitLab Why can we not divide this into two branches, \$ B_1, B_2 \$ ...
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391 views

Power Dissipation Issues

I built a circuit with a 5V power supply and a 300-ohm resistor. With a multimeter I did the measurements of resistance, voltage, and current across the resistor. The values were: \$R = 298 ...
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73 views

Finding the voltage of a capacitor

I was given this problem by my prof and his answer is simply that it is a parallel RLC circuit and he uses $$s^2 +\frac{1}{RC}s+\frac{1}{LC} = 0$$ for the characteristic equation. It seems to me ...
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180 views

Calculate op-amp output voltage

I am trying to calculate the output voltage of the circuit. I know that this is a voltage follower, but I am trying to understand how it works. simulate this circuit – Schematic created ...
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42 views

RC integrator behavior

I am trying to implement an RC integrator circuit in my design. The purpose of this circuit is to convert input pulse signals swinging between 0 to 2.5V into a ramp signal. The integrator circuit was ...
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4answers
80 views

Input and output resistance of an opamp circuit

Recently we have been working with opamps in the lab and I never can understand how to determin the output and input impedance of a circuit with op-amps (not the input and output inpedance of the ...
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2answers
1k views

Half-wave diode rectifier - is textbook wrong?

I've noticed that in all resources on diodes and rectifiers, they show the output voltage as the positive half-wave of the input signal. However, that seems wrong. I understand that there's a voltage ...
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3answers
52 views

What does having the v in the center, with the positive near the top wire and negative near the bottom wire mean in this circuit diagram?

This is the diagram that I am asking about: I understand that the symbol on the left hand side of that middle branch is a current controlled current source, and the symbol on the right is a current ...
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32 views

Understanding Mesh Analysis

Using Multisim, I was able to calculate these current values, however I can't seem to understand their correlation with the individual mesh loop current values I calculated using matrices in MATLAB. ...
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3answers
364 views

Why is series LC circuit not behaving as band pass filter?

I am trying to simulate LC circuit using external source that generates square wave of 503Hz of amplitude 2V as below: Natural frequency of circuit above is 503Hz.So it must pass this much ...
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Thinking causally about linear circuits

I am taking a course on LTI systems. I understand phasor analysis, complex impedances, and I can apply the methods mathematically. What I don't have is an intuitive understanding that I hear in ...
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90 views

Unexpected dominant pole in active-RC circuit

Consider this active-RC circuit: simulate this circuit – Schematic created using CircuitLab it should exactly realize the RLC high-pass filter with one zero: simulate this circuit ...
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51 views

Is this correct,circuit question

V=10√2 <45 and J=2<0 in the figure.I have to find Io. So I apply nodal analysis in node Vo and I have 2<0+ (10√2 <45-Vo)/4 +0.5Io=Io I know that Io = (Vo/-3j) .I replace this in the ...
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2answers
150 views

Solving transient circuit with serial RLC using Laplace Transform

I'm trying to solve this using Laplace transform: (U - voltage, I - current). I am to get Uc. My attempt was to calculate I and then get Uc using ohm's law, but I wasn't able to find the I yet. ...
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45 views

What is the difference between nodal analysis and Superposition? Can I use nodal analysis in Superposition?

All I need to know is it possible to apply nodal analysis in superposition? For example lets see the following circuit: I have to use superposition to find the voltage across the current source of ...
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50 views

Particular current divider

Consider this circuit: simulate this circuit – Schematic created using CircuitLab (this part is preceeded and followed by other components). $$I_1 + I_2 = \displaystyle ...
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1answer
53 views

Implementing a simple two door security system

This is a very simple task and I understand most of it (already has a solution), but there are some things which I need clarification for. The problem is: There are two doors (one behind the other), ...
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1answer
68 views

Help me implement the crossroad traffic lights using multiplexers 4/1?

I came across this problem and it has a solution and everything, but I don't understand it. Here's the illustration: So, the picture shows a crossroad which has sensors along the higher-priority DC ...
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1answer
76 views

Inconsistency in the calculation of the gain of an emitter follower

I want to calculate the gain of the following circuit, but two different ways give different results. simulate this circuit – Schematic created using CircuitLab First method: (This ...
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From RLC prototype to signal flow graph

This simple 3rd order low-pass circuit simulate this circuit – Schematic created using CircuitLab can be described with the following 3 equations: $$-V_1 = \displaystyle \frac{-1}{sC_1} ...
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4answers
66 views

Why don't phasors give the transient state?

I don't understand why phasor analysis doesn't tell us anything about the transient state. At exactly what part of the analysis is the transient part "lost"?
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1answer
55 views

Don't understand high pass filters?

Consider a RC circuit functioning as a high pass filter. The transfer function is given by: \$T(j\omega)=\frac{K}{1-j(RC/\omega)}\$ For a frequency of 0, the transfer function is 0. Which means for ...
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1answer
65 views

Understanding operation of decoders and multiplexers

I just started to study decoders and multiplexers and I saw this task which I'm not sure how it's done. Can you please explain me (solution attached): Using the decoder DEK 3/8, construct the decoder ...
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2answers
25 views

Choice of state variables in circuit theory

I have been trying to get a more fundamental grasp on what a circuit is, mathematically speaking. I have read about the lumped element model, constitutive equations, and the memristor. However, I ...
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179 views

Batteries in parallel vs voltage signals in parallel

From a practical point of view, when you connect two audio signals to one speaker the result is that both audio signals can be heard. That means the two voltage waves were added, correct? However, ...
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119 views

Transfer functions with constant voltage sources in them?

I am trying to get the transfer function: $$H(s)=\frac{V_o}{I_i}$$ For the following circuit: simulate this circuit – Schematic created using CircuitLab I think I can get it without ...
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65 views

Order of circuit decomposition to find thevenin circuit

In the circuit below, Vs=18V, R1=100Ω, R2=100Ω, R3=100Ω, and R4=100Ω.! Determine RTh for the Thévenin equivalent circuit. I know to find the thevenin resistance, all independent voltage ...
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61 views

Source Transformations

I am learning about source transformations in my circuits class and I had a couple of questions regarding them. Question 1: Is a source transformation a law? By this, I am asking if I am able to do ...
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1answer
80 views

Analyzing a BJT circuit

Here is the example with its solution: The problem is that when I apply KVL to the circuit (the second circuit) from the 10V source to the ground at the bottom, I get wrong values. Here is what I ...
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1answer
59 views

step response of a circuit having an inductor loop

What is the step response of \$I_1(t)\$ in the following circuit? (I mean if we apply step as input I what will be the I1? I simply used Laplace transform and calculated the step response, but it was ...
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1answer
67 views

Mesh analysis with current sources [duplicate]

Below is a circuit schematic of sources and resistors. $$I_s=2A, V_s=20V, R_1=10Ω, R_2=6Ω, R_3=80Ω, R_4=15Ω$$ Question 1: Calculate the current i1 flowing through resistor R1. Question 2: ...
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1answer
50 views

Assigning current direction in mesh analysis

Below is a circuit schematic of sources and resistors. $$V_S=10V, R_1=50Ω, R_2=15Ω, R_3=5Ω, I_S=2A$$ Question 1: Calculate the current i1 in amps that goes through R3 from left to ...
2
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1answer
211 views

Amount of heat developed in capacitors

simulate this circuit – Schematic created using CircuitLab Q10 is equal to 10μC. No charge on C2. I need to find the amount of electric work that is converted into heat, from the moment ...
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1answer
57 views

Voltage on coaxial line - calculation process

Compute the voltage on the end of coaxial line (\$Z_0=75~\Omega\$, \$l=100~m\$,\$\tau=5~ns/m\$) at time \$t=1.6~\mu s\$ after connecting the line to voltage source (\$U_0=6~V\$,\$R_i=0~\Omega\$), if ...
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91 views

Choosing a correct diode

I am trying to find a suitable diode to place on the wire that connects c and e in the circuit, with the cathode on the right hand side. I need to justify why I chose the specific diode as well. ...
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1answer
99 views

Using diodes to increase efficiency

So I have the schematic below and I am to insert diodes into the circuit to increase the efficiency of the circuit (can only insert diodes, not change the wiring). 'Target' is where I want the power ...
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2answers
108 views

Different LEDs in parallel

Are there any special considerations I should pay attention to, when I wire multiple LEDs in Parallel? I am doing a project with a 100 LEDs in parallel. Each LED could be a different color, and each ...
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107 views

what does this OPAMP circuit do (with parallel diode and resistor)

It kinda looks like schmitt trigger but i couldn't understand the parallel diode resistor part. Is it possible to analyse this circuit with node-voltage method?
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59 views

Solar panels at night without diodes - short circuit or source of power dissipation?

So the title pretty much sums it up. I have a circuit that has a solar panel and some other power sources and I am to do a circuit analysis when there is no sun and show how it affects the system. ...
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43 views

How do I write the supermesh equations in this circuit?

Hi, I'm trying to solve this circuit via mesh analysis in order to challenge myself but I'm splitting my head here. I'm not asking you to solve the whole circuit, I'd just like some help with the ...