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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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Trying to find the ratio of voltmeters V1/V2

I'm trying to find the ratio of voltmeters V1/V2. My attempt is shown below Let's recall each resistors R and then we'll have V1 = (2R)(I) (since two resistors are in parallel). V2 = (3R/2)I (two ...
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1answer
37 views

Rise time different from fall time; relationship differs between AND and XOR gates

I'm looking over the results from a lab I did in an introductory electronics class, and found something I'm unable to explain. We measured the rise and fall times for two logic gates in this absolute ...
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0answers
34 views

Second order stable filter for RLC circuit

I have the above circuit which is described by the following differential equation: \${d^2y / dt^2+1/RC*dy/dt = 1/RC*du_1/dt + 1/RC*du_2/dt + 1/LC*u_2} \$ where \$y=V_c\$. What I want to is to ...
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1answer
64 views

Comparing Responses for Linear and Non-Linear System in Simulink

I am going through and reviewing this unprofessional (I highlight a potential mistake in Section3.4) paper: Nonlinear Model & Controller Design for Magnetic Levitation System Specifically, I am ...
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2answers
86 views

Question About Current Flow Direction [closed]

I've got a question that has been perplexing me for a while. (Correct me anytime) (Please do not give me any textbook definitions.) Starting with the name of the question itself, I believe current ...
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1answer
48 views

What is the current through this parallel circuit?

I'm trying to solve the attached circuit for I1 and I2. I think I1 is just 5A but I'm not so sure about I2, I think it might be just 10/5=2A but I'm not sure if the voltage in the top right part is ...
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1answer
39 views

circuit analysis basic question

All voltages are referenced to ground unless otherwise noted. SW1 = CLOSED; VA =
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76 views

How can I approximate the capacitance of a circuit, prior to building it?

I have recently gotten into FPGAs, and am interested in interfacing it with other, high-speed components (in general, not any one specific components). Since time is a factor, and I have both ...
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1answer
98 views

Designing 4th order Butterworth Multiple feedback bandpass filter

I'm trying to design a 4th order Butterworth bandpass filter using Multiple feedback topology. The design requirements I am trying to achieve for this filter are; Q factor = 10, Av = 11, fc = 100kHz ,...
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1answer
51 views

Question about SR latch timing

I have a question about how SR latches work: To my understanding the real-world implication is that one of the two gates will receive power first and produce an output signal, and they aren't going ...
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2answers
39 views

Difference between low signal and no signal for a SR latch?

I am struggling to understand how the SR latch works. When an input has designation 0, this means "low signal" correct? Is this completely different than "no signal"? Doesn't a logic gate need some ...
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0answers
14 views

Derive an expression for the current of a RLE rectifier

I'm trying to calculate an expression for this RLE rectifier: simulate this circuit – Schematic created using CircuitLab With \$R=2 \Omega\$ \$L=20 mH\$ \$V_{DC}=100 V\$ \$V_{m}=120 V\$ \$...
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68 views

LiFePo4 over-charge protection for automotive system

I have been looking in to the topic inferred by my subject line of late as I work on a 1980 Suzuki motorcycle's electrical system. I'm looking to use a LiFePo4 battery in place of the stock AGM to ...
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1answer
46 views

Admittance of the impedance of R and C in series?

I have a resistor \$R=150\$ and a capacitance \$C=\frac{1}{750\omega}\$ in series: \$ Z=R-jX=R-j\frac{1}{\omega C}=150-j750 \$ If I take the admittance I have \$Y=\frac{1}{Z}=\frac{1}{R-jX}=\frac{...
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1answer
50 views

i can't find the resonant frequency in a rlc circuit

I have an exercise where I have to find the resonant frequency but the equation can't be solve. What happen in those cases? It is possible to say that te RCL circuit does not have a resonant ...
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1answer
51 views

RLC bandpass filter

I am working on a circuit: simulate this circuit – Schematic created using CircuitLab My goal is to find \$ \omega_0, \beta, \$ and \$\varrho \$ The way I approached this problem was to ...
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3answers
151 views

How do I calculate the resistor R2 in this current limiter?

How can I calculate the resistor R2 of the above circuit? I know how to calculate R2 to control the base of Q2 but I don't know what I have to do to take into account the current from the collector ...
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1answer
35 views

Confused about circuit analysis example [closed]

This is probably going to seem like a dumb question but how would you calculate the current i1 in this example?
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55 views

Ideal diode IV characteristics

If I know that the Ideal Diode only allows current to flow once V > 0, how would I go about implementing the two resistors into the IV graph? How do I analyse the circuit as a whole IV graph?
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2answers
51 views

Output resistance of BJT common emitter circuit

I have found this circuit on a video, he talks about output resistance of the BJT of common emitter amplifier circuit not being infinite but very large so that it must be included in the re model. In ...
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2answers
65 views

Scenarios where Inductor back EMF would result in damage of circuit or component

Let's say that there is a simple circuit with the following components (ignore values): LEFT: a simple power supply (assume DC) TOP: load (resistor) and inductor RIGHT: switch BOTTOM: load (resistor) ...
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1answer
177 views

Maximum frequency of a high-pass filter

simulate this circuit – Schematic created using CircuitLab A) Derive the expression for \$ \mathcal{H}(s)\$ where \$\mathcal{H}(s) = \frac{V_o}{V_i}\$ I started by using the voltage divider at ...
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1answer
56 views

Frequency vs time constant

What happens when I have a low pass filter with R = 1kΩ C = 0.1 µF and I input a square signal with different frequencies? Will the time constant be the same for all frequencies? τ = 100 µs for 1 kHz ...
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1answer
67 views

How to derive cutoff frequency equations from the transfer function

I am working on a problem from the textbook Electric Circuits 10th edition simulate this circuit – Schematic created using CircuitLab I am trying to figure out first how to go from the ...
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0answers
36 views

What controls the input voltage limits for a VCO?

When I build a VCO circuit, from where I obtain a time dependent signal from a DC input voltage, I noticed that the circuit only works as a VCO for a certain range of Vin. What do these limits depend ...
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2answers
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RC circuit with sinusoidal voltage - initial behavior?

For a simple RC circuit with a sinusoidal voltage source, the differential equation is: $$\frac{dq}{dt}=\frac{sin(t)}{R}-\frac{q}{RC}$$ When I plot the solution to this differential equation using ...
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4answers
88 views

Basic nodal analysis question

I have a question about node analysis method. The part I could not solve is the Node c's equation. In equations, C is represented by 3.Here is my question what is G5(i=GV) in the circuit. The empty ...
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1answer
47 views

Circuit element: Rectangle with diagonal

I am a newbie in electronics, so please bear with me. I have a Induction proximity sensor which I have to integrate with a data logger. But, I have run into an issue with a circuit element. I am ...
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2answers
94 views

Need help understanding an electronic oscillator (Schmitt trigger + capacitor) [duplicate]

When we use this circuit, the LED blinks. I know an inverter transforms high to low voltage and low to high voltage, but here the voltage source is connected to the inverter all the time so the ...
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2answers
115 views

Is there back EMF in an induction motor?

I noticed that in deriving the equivalent circuit for an induction motor in the rotor component, that a "variable" resistance was introduced. This really confused me as I didn't understand how power ...
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1answer
44 views

What is the best approach to calculate the transfer function of this RC circuit?

I want to calculate the transfer function of the circuit below. I tried to calculate the equivalent impedance of each block and work my way with voltage dividers until I get to V3, but this method is ...
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1answer
74 views

Kirchoff law exercise

I need to determine the current across the 4 ohm resistor (name it I1). What I calculated, thought out so far : Current of 2 ohm resistor : I=5V/2ohm=2,5A. I Think this current is flow towards the A ...
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1answer
87 views

electrical homework help

I need to solve exercise 57. I need to determine the voltage between points A and B in diagrams (a) and (b). What I think so ...
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69 views

Calculate V0 and I0

For my homework I have to find V0 and I0 in the following circuit, but I have no clue where to start.
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1answer
50 views

Why do we divide by slip in the Rotor equivalent circuit for an Induction motor?

I was reading this article and everything made sense until the equivilant circuit for the rotor was divided by the slip s. I understand that the current in the circuit would remain the same, but it ...
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1answer
75 views

Explanation for circuit with 2-stage op-amp, with diode in between first output and second input

I am a beginner in op-amp design and would like to get an explanation to a circuit that has a diode wired in between the output of op-amp-1 (stage 1) and the input of op-amp-2 (stage 2). The ...
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2answers
78 views

DIODE: why is it that as current --> infinity ( gets really large) the following happen:

In a forward bias Diode, why is it that when current gets really large : 1) voltage drop across the diode does not increase a lot ( its because of logarithmic nature? and if so why is it logarithmic)...
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2answers
65 views

What is meant by the Sending end and Receiving end in 3 phase electrical circuits?

I do not understand the what sending or receiving end means in 3 phase circuit analysis. Aside: Also I am struggling to understand 3-phase just in general with respect to circuit analysis so if there ...
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1answer
53 views

Charge Pump Circuit explaination

I am trying to understand a charge pump circuit here but one part has me scratching my head and this sort of scenario happens a lot with me in electronics. It’s a question of what happened first?? If ...
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1answer
54 views

Trouble analyzing BJT circuits when we change β from very high to 100

For example we have this circuit: Originally we assumed β to be very high and we assume VBE = 0.7. So for this, we have IB = 0 and therefore V1 = -0.7V and V2 = 3.4V. Now that we have β at 100, IV1 ...
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1answer
39 views

Issue with driving Brushless Motor with a MOSFET Driver

So I have been given a circuit which supposedly works. The circuit was the the one shown but with a 10k resistor where the scribbles are. Q17 is an IRLM6344TRPbF N-chanel MOSFET and Q16 is a ...
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1answer
41 views

Does Reactive Power flow between Energy storage elements in a three phase system?

I noticed that unlike the single phase ac power sources, the power in three phase is constant which means the instantaneous power is the same as the real power which is $$3V_{rms}I_{rms}\cos{\theta}$$ ...
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2answers
75 views

Q: Whats the schematic of this Potentiometer

Just wondering what's the wiring, kinda confused on how this actually looks on a schematic. Does this look correct? simulate this circuit – Schematic created using CircuitLab
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0answers
38 views

Q: What's happening to my power rails and Comparator output

My voltage rails is ~5.07V and the comparator outputs ~5V. However when I put in the mosfet as shown believe my Voltage rails become 6.48V and my comparator goes down to ~3.58V? What is exactly ...
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1answer
127 views

Why in the Thevenin Theorem do we have to “turn off” independent sources to find Thevenin resistance

In my basic circuits course we learned a handy circuit analysis technique so that we can simplify a linear circuit to it's equivalent voltage source and resistance. When looking for the Thevenin ...
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1answer
25 views

Trouble with replacing potentials for cc sources

I'm studying JFET transistors, and I'm having trouble with two things: the electric potentials on the following circuits. Writing the voltage Vds in function of Vdd, Id and Rd. For example, for the N ...
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3answers
87 views

Circuit analysis for RC circuit

I have this circuit and want to calculate the voltage at v2 when t>0. v1 has a 6 volt step at t=0. I tried to do nodal analysis and came to 2 equations for the 2 unknown nodes, but did not know what ...
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1answer
51 views

Output Impedance of Passive Circuit

I have a circuit with resistors, capacitors and inductances. I need to plot the output impedance of this circuit for different values of two components in this network. Do you know a program (either ...
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1answer
33 views

Connect 3-port and 1-port devices defined by S-matrices

There are two linear networks. The first is defined by 3-port S-matrix: \$\mathrm{S}_\mathrm{A} = \left[ \begin{array}{lll} s_{11} & s_{12} & s_{13} \\ s_{21} & s_{22} & s_{23} \\...
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Resistor for buzzer current consumption limiting calculation

I would like to know how did the circuit designer of the circuit in the image calculated resistor R100 value. My guess is that the 100ohm resistor is to limit the current to ~20mA. I have tried to ...