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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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Feedback on a simple Motion activated motor circuit

I have been working on a Motion activated Motor which uses PIR sensor to detect the motion. The idea is when PIR detects user in front of it motor should start running and when the user moves away ...
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1answer
1k views

Mesh analysis with common voltage source?

What happens if I have a dependent voltage source common between two meshes? Do I need to form a supermesh or is it okay the way I solved it?
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1answer
20 views

simple circuit analysis kcl kvl

can i know what, why and how this Rth is parallel / how its calculated? answer by jonk: thevenin analysis i mean my solution would be: I1 = I2+ I . I1 = (9-V2)/10k I2 = V2/20k I = V2-...
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1answer
40 views

Finding \$L\$ value in simple circuit

Hello and first of all sorry for posting a screen, I don't know how to make my own schematics. This is one of the excersises from previous year's electrotechnics. The formula to calculate the result ...
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47 views

Delay In circuit

I am working on a mini project using op amp.The circuit uses comparator so when a resistance is changed i.e the Vin is changed(cause I am using Resisters Voltage divider )comparator gives output and ...
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42 views

Automatic counting of the number of nodes, branches, contours in the electrical circuit

For scientific work, I need an automated counting of the number of nodes, branches, and contours, since need to work with large schemes with a large number of complex relationships. I use Microcap, ...
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35 views

Equivalent Circuit of Howland current Pump

Why is at norton circuit for Howland current pump the current source is taken as vi/R1 instead of vi/R0? Because the formula for Norton current is IL=In*(Rn/(Rl+Rn))
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75 views

How is this equation valid?

I am trying to understand the Howland circuit.But how is the following equation formed .Isnt it should be(vi-vo)/R
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86 views

How will I determine fundamental loop equations from a graph which contains 3 and 2 terminal circuit elements?

This is the question and details. I believe I could manage to get the graph from the given circuit. (part a) This is the graph I drew. But I could not find part b and c, since they require ...
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1answer
151 views

Impedance calculation from voltage and current (exponential) waveforms

If we want to find the impedance across two terminals (a port) at a frequency \$\omega_0\$ using the voltage waveform across \$v(t)\$) and current through (\$i(t)\$) the terminal, general intuition is ...
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2answers
62 views

Differential equation of an OP AMP circuit with RC elements

I have to find the differential equation which describes the relation between input and output voltage for the circuit below. Per how the RC components are arranged, I simply can not find a ...
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1answer
91 views

Is state variable analysis used much in circuit analysis these days?

I am an older EE and I have used the old tried and true methods of circuit analysis like KVL, KCL and some Signal Flow Graph methods. Recently I have been reading about methods that were originally ...
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84 views

Finding total impedance

I have a circuit as shown below simulate this circuit – Schematic created using CircuitLab Where R1, R2 are resistors. jX1 and jX3 are reactants, and jB2 is admittance. That being said, I'm ...
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1answer
30 views

Function generator output

A function generator is hooked up to two resistors in series. The voltage across the function generator changes over time, shown by the different graphs The questions asks to find the output voltage ...
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0answers
34 views

PTT works not as excpected [on hold]

I bought the following headset with a push to talk (PTT) button and four pin headset jack. If I connect this to my windows notebook the microphone is always on / working. But the curious thing is ...
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4answers
435 views

Circuit Analysis: Obtaining Close Loop OP - AMP Transfer function

Trying to figure out the Close Loop System transfer function of an op-amp, however the math isn't working out as it should. Circuit In question: simulate this circuit – Schematic created using ...
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2answers
83 views

Find Voltage of inductor in LC series circuit with resistor in parallel

I have a LC resonance circuit with a resistor between the capacitor and inductor: simulate this circuit – Schematic created using CircuitLab I want to find the Voltage at L1, more specifically ...
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57 views
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60 views

Thevenin equivalent of the following circuit

So...I have to find \$v0\$ using exclusively Thévenin/Norton equivalents. I am completely lost since in this case I have a dependent voltage source which relies on \$v0\$ itself. \$v1,a,R1,R2\$ and ...
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1answer
119 views

Why is this component that looks like a capacitor with ground lines in this circuit diagram different from a polarized capacitor? [duplicate]

What is the component that is represented with two horizontal lines like a capacitor with three Ground Chassis lines connecting them and a + at the top and a 10μ label. See picture below (top right ...
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0answers
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Why the opposite of the passive sign convention is not the active sign convention?

Studying the fundamentals of circuit theory, I was reading the Wikipedia article on the Passive Sign Convention and found out about the Active Sign Convention (ASC). After searching many introductory ...
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2answers
107 views

Arduino Geiger Counter

I have found somewhere the following scheme for an arduino based geiger counter. (The arduino main purpose is to count the pulses from the tube) As far as I can understand it, the transistor would ...
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1answer
48 views

How do I calculate the voltage across a capacitor when the source is a square wave?

I have a series RC circuit with R= 2.2K Ohm and C=100 nF, and the voltage supply is a 2.5V peak square wave. And I'm not sure how to calculate the voltage across the capacitor.
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1answer
35 views

Reverse Engineer DIN 5-pin connector

Summary I have a digitial guitar amplifier that can be controlled via a footswitch. The footswitch is connected to the amplifier via a DIN 5-pin cable. I want to be able to control the amplifier with ...
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47 views

Voltage law not correct [closed]

Is the voltage wrong? Across the resistor there cant be any voltage drop because the electric field of a battery that forces the electrons to move is constant for all points inside the conductor.Just ...
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1answer
87 views

Other ways to solve this other than Delta Star Transformation

I solved this using delta star transformation (Zeq = 2/3 ohm), but I can't find other circuit analysis techniques to find the Zeq & Io, any help?
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125 views

The Art of Electronics (Integrators)

Reading this topic from "The Art of Electronics" : Integrators How does RC keep V << Vin?
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91 views

Finding the average power dissipated in a resistor

Well, I've a series RL circuit that is powered by a voltage source. The input voltage is given by: $$\text{V}_{\text{in}}\left(t\right)=50+\frac{400}{\pi}\cdot\sum_{\text{n}=1}^\infty\frac{\sin\left(...
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2answers
58 views

Thévenin's Theorem Example

I just started learning Thévenin's Theorem. My textbook gives the following example: I'm referring to online sources such as this to complete this problem. However, all of the circuit diagram ...
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1answer
19 views

Explanation of Source-Absorption Theorem Example

In the section on the Source-Absorption Theorem, my textbook has the following example: I was wondering: If the voltage $$v_\pi = - v_e,$$ then why do we get $$g_m v_\pi = g_m v_e$$ instead of $$g_m ...
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0answers
24 views

Changing impedance of load [closed]

For this representation, why is there a change in the variation of the impedance when Zload = R2?
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1answer
96 views

Envelope detector circuits

Why do these circuits have different output signals, please explain in detail. And how does the envelope detector work?
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1answer
33 views

Finding Norton voltage and resistance and max power

My directions for this problem are to find the power delivered when RL=3 and then find the maximum power. simulate this circuit – Schematic created using CircuitLab I found Rth = R1//R2 = 1 ...
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1answer
95 views

Differential amplifier with two opamps

Recently, I was asked in a final exam how to do this. I tried to apply superposition but I think I am not understanding something in here. Does anyone know how to calculate the transfer function of ...
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2answers
84 views

Thevenins Theorem

Can someone please help, I'm struggling with this circuit. I don't quite understand what I need to do, mainly with whats series and parallel. My tutor is not helpfull in the slightest! He' only given ...
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1answer
38 views

Algorithm for getting currents and voltages from resistances in circuit as graph

For my CS project I have to write simple circuit simulator, where I get list of edges of circuit as (a,R,b), where a and b are nodes at the end of the edge and R is it's resistance (it has a resistor ...
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1answer
114 views

Intuition on Thevenin's Theorem

In the following lecture by Prof. Anant Agarwal at 36:00, he intuitively proves Thevenin's Theorem using the following circuit simulate this circuit – Schematic created using CircuitLab If ...
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1answer
102 views

RMS current of a circuit driven by a white noise voltage source

Note: I am an applied mathematician, not an electrical engineer, so apologies if this comes across as silly. I am analyzing the following circuit as part of some modeling related to energy storage ...
3
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1answer
56 views

What is this SMD part?

I’m trying to repair a powered recliner touch sensor, and I’ve isolated the part that I think is the problem. The issue is, I don’t know what it is! In the first image, you can see that it has three ...
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1answer
98 views

Solving circuit design problem with two approaches

A voltage of 200V is applied to a tapped resistor of 500 ohm. Find the resistance between two tapping points connected to a circuit needing 0.1A at 25V. I have solved this problem with two approach. ...
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1answer
100 views

Calculate the capacitor voltage for t < 0 and t > 0 for the circuit below

Please help me calculate this. I tried using the thevenin equivalence method however I'm not familiar with two independent sources in a circuit. When I was simplifying using thevenin method the ...
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1answer
98 views

How to solve this circuit with dependant current source and resistors that are neither parallel nor in series?

I've spent more than 3 hours with the idea that we should find current across every resistor in terms of i10. This is somehow not working, I mean putting the KCL (Kirchoff's Current Law) equations of ...
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0answers
61 views

What is the Thevenin Norton equivalent of the folloing circuit

I am trying to find the Thevenin Norton equivalent of the folloing circuit. I am familiar with the procedure. However, when I am taking off the voltages to calculate the equivalent resistance, I am ...
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1answer
47 views

LTSpice current dependent current source timestep too small error

I solved this circuit by hand.Which asks to calculate vo and Io in the circuit. And I tried to verify results with LTSpice. If I change dependent current source B2's equation to I = I(R1)* 50 it ...
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1answer
102 views

Latching power switch circuit

I am trying to understand: 1) how the following circuit works and more specifically how it turns on. 2) How to to modify it to get a hold on/hold off behavior instead of push on/hold off to prevent ...
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2answers
71 views

Does connecting LEDs in parallel use more current then connecting them in series in my circuit?

Sorry if this is a dumb question, I need a sanity check on this stuff. Is it possible to give LEDs varying current, without sacrificing efficiency? Basically I have 4 LEDs which could all use ...
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2answers
105 views

How would I go about converting a change in capacitance into frequency? [closed]

I have to make a model for a pressure sensor. The sensor measures the pressure by changing the capacitance. I only have the datasheet for that. Summary: pressure>> diaphragm deflection >> change in ...
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3answers
137 views

Why does a capacitor charge faster when there is a diode connected?

In an series RC circuit why does a capacitor charge faster when there is a diode connected in parallel with the resistor? I tested on an oscilloscope, using a square signal and this is what I got. ...
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1answer
115 views

Please help me understand this bjt set up works

This is part of an automotive timer (NOT a 555!) that we have at work. Because I'm extremely bored I'm challenging myself to understand how this one operates. I've spent about 1.5 weeks with tutorials,...
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1answer
65 views

Solving a circuit with Nodal Analysis [closed]

I've been trying to start solving the circuit for a long time now, but I've no idea where to begin, what node should be grounded. Someone please solve this circuit ina detailed manner