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

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ambiguous component values (ex. U01 U47 M47 etc.)

i'm having a hard time understanding components value when it's given in the following formate U01 U47 M47 sometimes it's even worse like 4N7 i know that U for micro, M for mega, N for nano but i ...
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How to apply reciprocity theorem to h parameters?

I know the result is h12 = -h21, but it's strange since h12 = V1/V2 and h21 = I2/I1. Reciprocity theorem says that ratio of excitation to result must remain same if they are interchanged, how do you ...
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21 views

Getting the Wrong Transfer Function for Controls Problem

Background So admittedly, it's been about 5 years since I've dealt with any kind of circuits and now I am going back and taking a controls course. On the very first problem I am doing, my answer is ...
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33 views

Understanding why voltage and current sources are to be divided by s in the frequency domain

I have been told that whenever I'm drawing a circuit in the frequency (s) domain, the voltage source is to be replaced by V/s and the current source by I/s. But what exactly is the reason? When I'm ...
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160 views

Which zener circuit would be more correct equivalent approximation?

Above on the left side is the original zener diode circuit. I want to draw a second approximation of this circuit by zener voltage Vz and zener resistance Rz (Rz is for simplicity constant). Vout ...
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72 views

Solving a source free series RLC circuit

How do I proceed to solve this problem. If I write a KVL equation, I get $$4 (4 Vc) +1/10^-3 integral i dt - 10=0$$ What to do next?
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3answers
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Are there any quick way to tell if a filter is high-pass, low-pass, or band-pass, just by looking at the transfer function in the s domain?

How can I quicly determine if a given filter's transfer function like: \$ H(s)=\frac{k}{s^2+ks} \$, or \$H(s)=\frac{1}{s+k}\$, is either a low-pass, high-pass, or band-pass ?
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2answers
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Closed circuit vs low resistance resistor

I'm learning electronics and this confused me. In this circuit it shows that current flows through both wires with resistors and lower only through one wire where there's no resistor (even though one ...
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Finding the current through resistor in source free parallel RLC Circuit for t>0

My solution: Since alpha >w0, so response is overdamped. Current through inductor:$$ Il(0-)=Il(0+)=6 $$Voltage across capacitor: $$Vc(0-)=Vc(0+)=0V$$ Current through resistor: $$ Ir(t)=A1e^{s1t} + ...
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22 views

How LTC3108-1's oscillator work?

I am reading about LTC3108-1 on the page. There is one part about oscillator that I am not sure how it works. Could anyone explain it more detail? Or could you give me a link so I can read up? ...
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3answers
69 views

Using complex number in solving linear circuits

I am reviewing about using complex number in solving electrical linear circuits. I see that the input sinusoidal signal \$ V_m \cdot \cos(\omega t) \$ is replaced \$ V_m \cdot e^{jwt}\$. Then solve ...
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35 views

Building a magnetizer

I'm building a simple magnetizer for the realization of a physics experiment, bought yesterday components for the construction of the same, I am following the scheme of this site: The final ...
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2answers
42 views

How were values of Vc(0+) and i(1.5ms) found?

I get that by applying source transformation, we get a (0.1*200=20 V) source but shouldn't 0.1 A current be divided into 50 ohm and 100 ohm resistance? Also why i=0 at t=1.5ms?
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44 views

How was Vc(t) found in this source free RC circuit?

Shuldn't \$v_c(t)\$ be the same as \$10^4\space i_s\$ after \$t=0\$?
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Plot of Ic and Vbe function

The book page 12 show the plot of collector current Ic vs temperature at fixed Vbe =600mV. With the equation: Ic = Is*e^(Vbe/VT). Where Is = 10^-16A. Vbe = 0.6V VT = kT/q = -8.6173324×10−5*T ...
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40 views

Differential equation mixed RLC-circuit, C parallel to RL

I am having trouble finding the differential equation of a mixed RLC-circuit, where C is parallel to RL. It is a steady-state sinusoidal AC circuit. I need it to determine the Power Factor explicitly ...
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102 views

How was this equation for finding current written?

It doesn't make any sense because at \$t\gt 0\$ the two circuits are disconnected (the left and right portion). How has \$25 i_x\over 20\$ been calculated?
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Ethernet driver Circuit

I've been working on Ethernet schematics, i noticed a network of capacitor and resistors present outside the RJ45 connector. For what reasons these passive components are used? I've attached the ...
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1answer
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Where should I go from here? [closed]

To explain; I study electronics at my university and I've just finished for the year. While there I was taught the basics, circuit analysis (loop/nodal/superposition, thevenin's and norton's theorem), ...
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28 views

Calculate the parallel value of resistors at base of common emitter amplifier

I don't know if questions can be asked like this here but if they can I want this question. In an exam paper I saw a question to determine the parallel value of the R1 and R2 resistors in the image ...
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27 views

First order circuits

I need to find the analytical expressions of the voltage and current across the inductor. I have found the initial conditions in order to solve the differential equation: v(0) = 0 V and i(0) = 5 A, ...
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42 views

How do I solve this electrical circuit?

The voltage across R is Vr. I want to plot I vs Vr on a graph. Given I = 6k mA. Now, my question is this: wont I vary with varying V1? Did I copy something wrong, or is there a way to plot this?
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What is mean by short circuit voltage [closed]

What is mean by short circuit voltage in Electrical Engineering
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dividing node matrix to tree-branches and links [closed]

A is the node matrix Aj = 0 if we have A = [A_l|A_t] show that A_t is always invertible ? (A_t is a part of matrix A which relates to tree branches)
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Diode Circuit analysis [closed]

how can i solve circuits like this ?! how current flow though determine the diode modes and calculate V and current in branches
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How is the current through resistor same as collector current in this circuit?

My textbook says that the current through resistor will be same as the collector current when the diode shown matches with the base-emitter diode internal to the transistor. Could somebody kindly ...
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23 views

Graphing a relation between input and output voltages in a circuit with 2 MOSFETs [duplicate]

simulate this circuit – Schematic created using CircuitLab Sorry for the 'homework' post. \$Vout=f(Vin), 0V < Vin < 3V, Vdd=3V, R=20k \Omega, \beta1=\beta2=10mA/V^2, Vtn=0.5V\$ And ...
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34 views

Graphing a relation between input and output voltage in a circuit with 2 MOSFETs

simulate this circuit – Schematic created using CircuitLab Sorry for the 'homework' post. \$Vout=f(Vin), 0V < Vin < 3V, Vdd=3V, R=20k \Omega, \beta1=\beta2=10mA/V^2, Vtn=0.5V\$ And ...
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2answers
55 views

How to make auto off functionality for an led lamp circuit with only transistor, capacitors, timer 555 chip?

The components I have are timer 555 chip, capacitors, and transitors. I want to create sleep functionality for a led lamp which consists of 6 leds in parallel and pnp, npn transistors. I want this ...
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14 views

Circuit problems for pressure transducer

I am working on a circuit to amplify my output voltage from a pressure transducer with the range of events 3-20 mV to be ready by a national instrumentation DAQ USB 6008 I have worked on 2 circuits ...
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5answers
151 views

Can a Tesla coil's secondary wiring overlap?

I am building a small tesla coil just as a proof-of-concept using a bug-zapper circuit. I unwound some enamel copper wire off a transformer and put it on my 12 cm length x 2 cm diameter PVC pipe and ...
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How to measure micro and nano amps via microcontroller [closed]

The objective is to build/construct a circuit powered by an ATMEGA32 IC, using C++. This circuit will essentially be an ammeter for small current levels (10-6 and 10-9). I've done some basic points ...
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Problem with short circuit

Comparing with short circuit how does a current flow in parallel circuits with different resistances. Shouldn't it just choose the one with lesser resistance?
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95 views

Why does my Kill-a-Watt read Power of only half the Voltage times Current?

My Kill-a-Watt is displaying that its output is 120 V, 0.16 A, and 10 W. I'm confused... I thought P = V × I from basic EE. Why do I see only half the expected value here? (This is a USB charger, ...
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2answers
65 views

One Digital Logic Question in Previous Exam?

I Prepare for Entrance Exam on PhD, CS Filed. I ran into a previous question with following options (A to D from one to forth lines): The question is: if the input is always has valid values (no ...
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1answer
45 views

Bridge circuit and the error caused by a differential amplifier

I am currently struggeling with solving the following problem: The circuit below shows a bridge circuit, where the differential voltage between the branches is measured by a differential amplifier. I ...
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1answer
42 views

RC filter with an square wave input (checking my math and find my error, if it is somewhere) [duplicate]

I've this RC filter circuit (r is connect to earth on the bottom): My Vin is a square wave: With Laplace transform I derived that: $$Vout(s)=\frac{r}{r+\frac{1}{cs}}\cdot Vin(s)$$ and this ...
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1answer
58 views

RC filter with an square wave input

I've this RC filter circuit (r is connect to earth on the bottom): My Vin is a square wave: With Laplace transform I derived that: $$Vout(s)=\frac{r}{r+\frac{1}{cs}}\cdot Vin(s)$$ and this ...
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5answers
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OpAmp used as adder

Let's say this operational amplifier, wired as adder, is given. Since the ideal OpAmp has an infinite input impedance, there won't be any current flow in the (-)-input. How can I calculate the ...
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19 views

amh needed from solar panel to run and charge

So I am making a small solar powered circuit to run a pond water pump (a 6v pump 333ma) I initially bought a 6v 333mah panel (in hindsight I have realised this is wrong as not enough juice will be ...
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1answer
27 views

Infrared Generator Circuit Calculations

I'm looking at my friend's notes on choosing resistor values for a simple infrared generator circuit. I don't quite understand it and was wondering if you guys could help me. I understand how they ...
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Nodal Analysis for Inverting Amplifier with output resistance

Please see attached image. Is this the correct nodal analysis for equation 1 & 2? How does equation 1 found, did they jump a few steps to get to the answer? Thanks
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Offset problem (op-amp pulsgenerator)

I've the circuit that you see below. And in our project we need a 50 Hz puls that we make in first op-amp circuit. But at the output we need a 50 Hz puls with 1.5 ms width when Vin=0V and a 50 Hz puls ...
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1answer
63 views

Op-amp voltage divider

I have troubles understanding the way the circuit below is solved. I figured out that the solution is: $$ V_+=\frac{R_2}{R_1+R_2}V_1 \\ V_a=\frac{R_3+R_4}{R_4}V_+ $$ But what is actually the reason ...
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Nodal Analysis Help

Please see attached image. Please can you check why my nodal analysis of for node 'x' is incorrect (according to solutions) Also could please explain to me how one gets from the second line to third ...
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what should be the aspect ratio for 32nm and 45nm technology?

i am designing a combinational circuit and circuit worked well too. but i want to know if i directly write a net list rather than generating it through some schematic what should be the concept behind ...
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Obtaining Anderson's Bridge Balance Equation

I'm trying to learn Anderson's Bridge Balance equation.I dont know how this value is obtained Why are they equating the voltage drops across branch one and the sum of the voltage drop across ...
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Passives used in differential signal lines

My doubt pertains to the presence of passives in many differential links (say RS422, for eg). Consider the schematic below - In the above circuits , I see a capacitor in series with the ...
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20 views

Finding CutSet Matrix from a Circuit

I have the following question My answers are Please let me know if my approach and answer is correct to find the Cut Set Matrix.
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DC-LVDT Output noise filtering

I am working with the DC-LVDT Omega 620-25 http://www.omega.com/pptst/LD620.html Manual: http://www.omega.com/Manuals/manualpdf/M4345.pdf Specs: http://www.omega.com/pressure/pdf/LD620.pdf I am ...