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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negative terminal of a sine generator

simulate this circuit – Schematic created using CircuitLab I had this problem where the anode of a diode was connected to the negative terminal of a sine generator and i wondered how it ...
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Circuit analysis ( Current intensity )

In my electrical engineering lecture we analyse such circuits with given Resistances \$R_i\$ and given \$U_{q1}\$ and \$U_{q2}\$ ( see example below ), and we try to find the current intensity \$I_{i}\...
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Can signals pass through a single wire in both directions simultaneously?

Can electric signals pass through a single wire in both directions simultaneously? To be clear, I mean signals that are not somehow modulated to avoid interference. I also mean a wire, and not a ...
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How does a Chua's Circuit work?

I am trying to understand the working of Chua's circuit. I have done the simulation and it works as it supposed to but I don't understand how it is working and generating such chaos. I have attached ...
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An intuitive interpretation of Negative voltage

This seems to be very basic but I am confused about it. I know ground is a point whose potential is zero. Now let's take a piece of wire , and mark a point A on that wire. I said , A has potential of -...
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Using an inductor and AC source to rise the current of an appliance

An Arc lamp requires a direct current of 10A and 80V to function. If it is connected to a 220V,50 Hz Ac supply, the series inductor needed for it to work is close to: To solve this question, we first ...
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Is the peak-to-peak voltage the same as the peak voltage in rectified voltage?

I have a homework in which in need to calculate the peak-to-peak voltage through a half-wave rectifier, center tapped full wave rectifier, and bridge full wave rectifier. What is confusing is that ...
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How to design a crystal oscillator circuit

I need to produce a 32.768KHz frequency for a binary counter but I have no idea how to design a crystal oscillator circuit. I tried multiple simulations in Proteus 8 but always failed in making it ...
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Nodal analysis for the following circuit? [closed]

Can somebody tell me what the equations formed using KCL will be at node 1 and node 2? I can do the rest of the question myself, just having trouble coming up with the right equations. Thanks in ...
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Resonant frequency of RLC circuit

Analysis I'm trying to find the resonant frequency for this circuit simulate this circuit – Schematic created using CircuitLab Writing up the node voltage equation for \$V_o \$ $$\frac{V_o-V_{...
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1answer
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Why did the resistance go up on my inductor?

I was testing an inductive load on a frequency analyzer, and apparently the resistive component went up from 2 to 25 ohms from 0 to 20kHz. Is there any reason for this or am I taking my measurements ...
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Help figuring out an op amp circuit with two loudspeaker outputs

I have to design a circuit that amplifies a sine wave with either a AD8616 or a LTC6256 (currently using the AD8616) to a 50 ohm loudspeaker and a rated power of 0.5 W. I'm a novice when it comes to ...
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What's the correct approach to this RLC circuit problem about RMS voltage?

How are you supposed to determine \$V_{C,RMS}\$ without R, L or C? I drew a phasor diagram and used \$Z=\sqrt{R^2+(X_L-X_C)^2}\$ but am unsure on how to proceed from here as I do not have values of R,...
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CMOS: worst case circuit analysis, transistor count [closed]

Look at the four-bit comparator truth table. Calculate the transistor count and make a worst-case circuit analysis. -What is a worst-case circuit analysis? -How to put in CMOS circuit form? -...
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Impulse response of a linear system

I am given an LTI system and its impulse response: $$ h\left(t\right)=[te^{-4t}+2e^{-2t}]u\left(t\right) $$ Where $$ u\left(t\right)=\begin{cases} 0 & t\leq0\\ 1 & t>0 \end{cases} $$ And we ...
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Electrical conductivity circuit help, with two solenoids

I have a project im working on but cant seem to figure out the basic of the circuit. The principal of the circuit is two solenoids wrapped around a chemistry glass making a magnetic field. The purpose ...
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Using analog comparators to get 2 different outputs depending on the input

I am trying to use analog comparators to get two different output voltages, 6V out when the input voltage is -8.5V <= Vin <= -2V and -3V out when the input voltage is -2V < Vin <= 9.5V. I ...
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What would happen if two voltage sources (one a DC battery and a dependent voltage source Vx) are in series?

If my battery is 18V and the dependent voltage source is Vx (Vx is the voltage across a resistor somewhere in the circuit), and if these two are in series, can I combine them into a new dependent ...
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Can this thing be built? Circuit to Increase 12vdc Rise Time Circuit (car-lighting)

I'm not a professional electronics engineer. Just an auto-enthusiast. I have no where to turn to ask if something like this old patent can be built by someone who knows electronics. Does the info in ...
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Oscillator circuit frequency error

I built the following circuit on a breadboard: Assuming rails of \$V_{DD}=3\text{ V}\$ and \$GND=0 \text{ V}\$, and an inverter switching threshold in the middle, one can calculate the theoretical ...
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Z(out) for the BJT emitter-follower configuration

I have a slight problem trying to understand how to determine the output impedance of a emitter-follower configuration using the re model for small signal analysis. I also added the contribution of \$...
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1answer
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How does this dice rolling circuit work? [closed]

I'm having trouble understanding how this whole circuit works. I am just a beginner trying to challenge myself but I can't seem to be able to.
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What does the line and load mean in this question?

Here is the question I don't need the answer, I just want to know what the line and load really represent here
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Voltage surge suppression technique in high-speed switching based electronic circuit

I am working on a circuit that transmits ~1MHz sine wave(20V amplitude) in RLC based circuit scheme, also transmits high-frequency signals(pulses(non-periodic)) ~20MHz(10 %DS)(20V) in a CR-based ...
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Explain the operation of this circuit

I am studying this application circuit to design the biasing circuit. I have understood the explanation up to a certain point, but I am stuck at the "Gate bias supply circuits" section. It ...
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Analog input to ATMEGA328P using op-amp - how does this circuit work?

I was looking for a good solution in order to use a bunch of components and read 0-10V/0-20mA and digital inputs using my Arduino Pro Mini (ATMEGA328P working at 3.3V.) I've found online this ...
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Thevanin Resistance Finding

I am experiencing few difficulties when finding the thevanin resistance(equivalent resistance) in this circuit. Maybe i am considering wrong serial, parallel combinations. Can anyone tell me the ...
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How does this MOSFET/Op-Amp voltage regulator circuit actually work?

I am trying to understand the functioning of this circuit since I have read that it is appropriate for power regulation: Here is the explanation that I have found: The zener diode provides the ...
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1answer
65 views

How to get the DC gain of an active high pass filter?

Edit: I think maybe I am confusing terms (it has been a few years since my last electronics class). I am trying to get the expression for the gain of this active filter amplifier circuit in terms of ...
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Regarding behaviour of a branch between two independent meshes

I'm trying to understand how a branch not part of loops affect the circuit. In the following, I can apply KVL on the two loops (supermesh and the one on the right) and I get the correct answer. The ...
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1answer
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alternative values of these resistor in circuit?

i am working on a spectrum analyzer, concept is to feed audio signal to esp32 and perform FFT at 40000hz sampling rate. I tried MIC input but did not get satisfied by results. link to diagram I found ...
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Direction and amount of current flow in the the circuit?

In the below electrical circuit if the wire CD has resistance 1 micro-ohm and the bulb has resistance 2 ohm and all other wires have negligible resistance will any current pass through the bulb or the ...
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I think I found an error in an electronics book. Are my equations correct here?

I'm reading Practical Electronics for Inventors, 4th edition, to freshen up my long forgotten knowledge of electronics. I love the book so far, but I just came across an equation there which seems ...
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How is a MOSFET amplifier useful?

I was wondering why would anyone use a MOSFET amplifier? Since a MOSFET amplifier is nonlinear, it produces significant amount of distortion. To minimize distortion, textbooks suggest using small ...
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Current in opamp

Im trying to do a node analysis on the next opamp configuration simulate this circuit – Schematic created using CircuitLab But the issue is at the third node (\$Vo+\$). What current is supposed ...
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Finding the cut-off frequency of a filter

For a general filter, what is the way to find the cut-off frequency? In this link Okawa Electronic Design shows a formula for the cut-off frequency of a Sallen-key filter that looks like: $$\text{f}_\...
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HSPICE create a voltage source in top level and instantiate it in a .subckt

I am fairly new to HSPICE and I am investigating someone else's testbench and I am trying to track down where is the vsource generator used in the .lstb analysis in this testbench. I am a bit ...
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Understanding the gain in an RC circuit's transfer function

I am learning about 1st order transfer functions, and I am trying to understand it with practical examples of systems, because it still looks weird to me how a same function can describe various ...
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What is the meaning of || symbol in circuit analysis equations? [duplicate]

I cannot figure out the meaning of the logical OR ( || ) in this context. Rin = R1 +R2||R4 in this circuit This was taken from this video https://www.youtube.com/watch?v=uir9Js1l_r8 *at around 6:00 ...
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How would this transistor diagram be drawn if we draw it with all the closed circuits?

In a book about computers I have this transistor diagram: the first two transistors are p types and the second two are n types. I am wondering how it should have been drawn if we close the circuits, ...
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Common-mode voltage on the body

In the attached figure, input impedances of the right hand, right leg and left hand are respectively \$20k,50k\$ and \$10k\$ Ohms. The input impedance of the opamp is also assumed to be \$1M\, \Omega\$...
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Voltage V3 across the capacitor

U10, U20 and U30 are the inital voltages across the capacitors. The question is: What is the voltage U3(in steady state) after the switch is closed? So... After a long time, I know the charges will ...
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How is a class-C amplifier useful?

As I understand, class-C amplifier can only generate signal of constant frequency and amplitude. So the question is, how can it be useful and what are its applications?
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Nixie tube project

I just got into Nixie tube clocks. I researched and found all the resources for the project (datasheets, models for Eagle/Fusion 360, etc.) I designed a schematic as well as the board. The parts cost ...
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2answers
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How can the current change suddenly in an RC circuit?

I was trying to simulate a circuit where a capacitor is being charged then discharged. I used an oscilloscope to measure the voltage and the current. I've noticed that when I switch the state of the ...
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4answers
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Help with a multistage NPN BJT audio amplifier

I am a beginner in electronics. I have recently learned about BJT amplifiers. I have designed this simple BJT amplifier on my own. The book I am following only has theories about various topics but I ...
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Where did the base get the current from?

Still learning on my own so I am really not an expert. I built a small circuit and can’t get the expected behavior. Here is the schematic: This is pretty simple. The PNP on top is connected to 5V on ...
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Changing motor RPM

I bought a motor which has these characteristics: RPM: 2800 HP: 3 Voltage: 240V 50Hz AC For the application I will be using this motor, I need to keep the existing RPM of the motor (2800) and in some ...
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Calculating maximum series/parallel configurations for unique resistors

Say I have 4 unique resistors. How would I calculate all the possible unique series and parallel configurations and thus, calculate all the possible total resistances? And how can I expand this to ...
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RC filters output voltage levels

How to calulate output voltage level (U2) for a frequency ten times greater than cutoff frequency? ] for example : U1(input voltage) = -14 dB? Or in second case. What is the output voltage level (U2) ...

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