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Questions tagged [passive-networks]

Use this tag for circuits that only contain passive components, such as resistors, capacitors, and inductors. This includes RC, RL, LC, and RLC circuits.

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POTENTIAL AT THE POINT [on hold]

how to find the potential at point B & C ? Given parameters x=5v,Vc = 4-5Vb i consider the three loop current for this i,e I1,I2,I3 and applied mesh analysis. equations are 3I2+5I3 = 32, 6I2-I1 ...
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1answer
65 views

What would be the consequence of the inductor saturating?

The following is a section from a book where it is talking about decoupling by LRC at supply terminals. I highlighted the sentence where I didnt understand: I read that if an inductor has an iron ...
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31 views

Is the permittivity of a dielectric medium measured by application of radio frequency of 1 kHz and a resonant circuit of 1 kHz are same?

I am working on a procedure in which I assess the dielectric constant of a medium by subjecting the dielectric medium to radio waves of certain frequency (or the medium is subjected to a certain ...
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2answers
59 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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3answers
2k views

Thevenin Equivalent Voltage: why ignore the 3-kΩ resistor?

In order to find the Thevenin voltage here, why is it that the 3k Οhm resistor is ignored and no current goes through it? (hence \$V_{TH}=8mA \cdot 7kΩ = 56V\$)
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2answers
44 views

How to smooth changes in *current* in a current meter?

I have a milliammeter I'd like to debounce with an \$f_c\$ of say 0.1 Hz (10 s) to where it reads a mean average rather than however fast the needle moves, dampened only by physics. Vcc is about 8-9 V ...
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0answers
43 views

RLC circuit with intial conditions

The circuit I have is given by the following schematic: simulate this circuit – Schematic created using CircuitLab I know a few things: The current in the circuit at \$t=0\$ equals \$\text{I}...
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3answers
90 views

Why parallel LC oscillator producing very high voltage?

I was trying to generate 1 MHZ frequency using LC parallel circuit using 2.53 mH inductor and 0.01 nF capacitor and I ...
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1answer
22 views

Why is there difference between the “ideal scenario” and the “ideal simulation” for this isolation transformer model?

The illustration below shows how an isolation transformer is protecting from electrocution by not letting the current to loop through the earth at the secondary side. Neglecting the parasitic ...
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0answers
28 views

RLC series circuit with initial current

I'm trying to solve, for the voltage across the capacitor in the following circuit: simulate this circuit – Schematic created using CircuitLab The initial current in this circuit is equal to \$...
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0answers
11 views

Differential Power Analysis - Sizing LC Filter for High Power (100W) Applications, Expected effect on Variance

Working on a project where I am defending against side channel attacks on consumer motherboards, specifically power analysis. By monitoring the power consumption of a motherboard in real-time, an ...
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2answers
67 views

What is the value of R? [closed]

What is the value of R? I need the solution.
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2answers
72 views

How to design an impedance meter?

I am designing an impedance meter with NI devices. I am applying 0-20 uA current signal to an RC circuit and measuring the voltage. Impedance is calculated by dividing Vp-p by Ip-p. I am controlling ...
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1answer
53 views

How to find new ABCD parameters when reversing 2-port network

I have an ABCD matrix represenataion which is defined as: For such a problem, what approach should I follow in order to organize the new ( reversed) network ports voltages and currents properly. I ...
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0answers
34 views

Solving a RLC circuit with a charged L and C

I've the following circuit: The input current is given by (the pules endures \$1/20\$ seconds and starts at \$t=0\$): $$\text{I}_{\space\text{in}}\left(t\right)=\max\left\{\mathcal{L}_\text{s}^{-1}\...
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Derivation of \$Z_{och}\$ & \$ Z_{sch} \$ for a symmetrical lattice two port network

I've been trying to proof the open circuit impedance of half circuit [i.e \$Z_{och}\$ ] and short circuit impedance of half circuit [i.e \$Z_{sch}\$ ] of symmetric lattice two port network (which is ...
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2answers
57 views

Impedance in RLC circuit

Does the impedance of RLC circuit change with time ?I think that it changes because in the beginning ,the opposition of the inductor is maximum then it begins to decrease as di\dt decreases and vice ...
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1answer
27 views

In Parallel resonance circuit mentioned below, is current equal for Resistor and Inductor?

The parallel capacitor will have current leading voltage by 90°. In the case of Resistor and Inductor (which are in series with each other but they both are parallel to capacitor). Now, the upper half ...
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1answer
45 views

Is 'R' in impedance equation an AC or DC resistance?

I am using an impedance meter to measure impedance in complex form (R-jX) and an RLC meter to measure R & C values in an RC circuit. The value of DC resistance is equal to the R value in impedance ...
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1answer
43 views

Problem in LC series resonance

I'm trying to experimentally verify my calculations on resonance on a simple series LC circuit. To prove resonance, I'm measuring the amplitude on the series resistor. When the amplitude is the ...
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1answer
90 views

Is the author wrong about this RC low pass filter circuit? [closed]

When reducing an RC low pass filter, the author of a text book makes the following statement: “Let us assume the application is such that, so that the voltage across RL is negligible.” Is the book ...
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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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2answers
44 views

What are the initial conditions used to find the coefficients in the current equations?

Suppose a RLC series circuit. R, L and C are in series with a battery and a switch. The switch is open. L and C are discharged. At t=0, the switch is closed and the battery (V1) feeds the circuit. I ...
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1answer
51 views

How do I find the current equations for the RLC Series Circuit?

Let's talk about a RLC series circuit. R, L and C are in series with a battery and a switch. The switch is open. L and C are discharged. At t=0, the switch is closed and the battery (V1) feeds the ...
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0answers
46 views

Differential equations for RLC Circuit

I have the following RLC circuit and I want to find out the differential equations that describe the circuit. Upper voltage $$ u_1(t) = 2\cdot\sin(t) $$ and $$u_2(t) = 1$$ My goal is to find a ...
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1answer
47 views

How can I model and simulate a resonant inductive square spiral coil in MATLAB?

I was wondering if it was possible to model and simulate my WPT system in MATLAB to determine if my analytical calculations are correct. I want to model my system in MATLAB as I have seen on MathWorks ...
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2answers
56 views

Solving for initial current for an RLC circuit with step voltage source

I have a problem where I am asked to find \$i_L(t)\$ and \$v_c(t)\$ for a parallel RLC circuit, with a step voltage source. The circuit diagram is this below, where the voltage source is \$5 u(t)\$, ...
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1answer
39 views

LC circuit powered by MOSFET generates not stable

Sorry for poor English. I have a transformer from an old TV and try to generate HV discharge. I've added a capacitor (C1 on the scheme) to get resonant frequency around 17kHz. Used coil 5-6 for ...
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1answer
64 views

Matching impedance network for an LC ladder network

Let's say I have a 5 stage L-C ladder network with L= 4.7 micro Henry and C= 60 pF. The characteristic impedance of the network becomes 280 ohms (square root(L/C)). However, from circuit analysis, the ...
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2answers
49 views

Vo in an RLC circuit

So I have this RLC circuit: And its equations for voltage addition, current conservation, ohm's law and a solution of those equations (Vo). Then there's this RLC circuit: With another set of new ...
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0answers
37 views

s-Domain transfer function of series LC in parallel with R?

I have to find the impulse response of the following circuit. First I need to determine the s-Domain transfer function (is(t)/i(t)), for which I tried to use current division. I tried a few different ...
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1answer
46 views

Vpp of oscillation of LCR circuit

Edited: I'm having a trouble to estimate Vpp of a RCL oscillation circuit. I found a peak to peak inductor voltage (Vpp_L) varies with the different combination of LC, which makes sense because the ...
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2answers
69 views

Why does this resistor network simulate differently from the physical package?

I am trying to simulate a Bourns 4310R-R2R-104 dual terminator 104 circuit resistor network. According to the datasheet, the circuit looks like this: When I read the resistance between pin 1 and pin ...
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2answers
231 views

Cutoff frequency of a second order low pass RLC circuit

L = 25 mH, R =1 kOhm, C = 10nF and Vs(t)=sin(wt)V, freq = 500 Hz I am trying to calculate the cutoff frequency of a second order low pass RLC circuit I don't know if I can still apply the formula of ...
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1answer
74 views

RLC Impedance Calculation

Sorry, will provide more information now. I am working through this question from an all about circuits webpage (See attached webpage link) and have having trouble seeing how they calculate an ...
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1answer
32 views

How is the sweep type affecting the Bode plots for the same AC analysis in LTspice?

When I do an AC analysis for the following circuit between 0.1Hz upto 20MHz, and by selecting "decade" in sweep types I obtain the following plots: But if I do exactly the same thing only this time I ...
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2answers
31 views

Source transformation violation

Using thevenins or norton theorem, we can easily find current through the resistor as 1 amps. But if we convert the current source to voltage source , current turns out to be zero amps . Why?
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1answer
34 views

Confused with electrostatic pickup and capacitive coupling terms

I can understand the meaning of capacitive coupling of the signal line to GND or Earth or nearby earthed objects. Below line section illustrates that: But there is also a term called “electrostatic ...
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2answers
99 views

Analysis of an LC circuit antenna

I want to analyse a parallel LC circuit in terms of inputs and outputs as I am studying them in the context of using them as a tuned antenna. However I am unsure of where to identify the inputs and ...
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1answer
72 views

Reset circuit loops forever on-off

I've designed the following circuit: This is a "self-reset" circuit, VCC_IN es 12V from source, VCC_OUT powers the entire board, including a PIC microcontroller. The idea behind this is whenever the ...
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1answer
104 views

RL circuit: How to determine the equivalent resistance of the circuit?

So I'm working on an RL circuit and the solution is stated to be that R1 and R3 are in series, but I didn't think that was the case because they don't have the same current through them. Given ...
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1answer
117 views

Differential Equation of a LC Low Pass Filter

I'm trying to learn about different applications of RLC circuits and have been presented with a weird looking circuit... I've only ever dealt with circuits that can be modeled with a 2nd-order ...
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1answer
82 views

finding small R in series RLC circuit

Hello! I have an device which is equivalent circuit is RC as follows in the image I shared: R is supposed to be 0.5Ω and C supposed to be 30nF, but it can vary a little bit between device to device. ...
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2answers
68 views

How to experimentally measure damping in RLC circuits?

I know there are methods to theoretically determine the damping factor and quality factor in RLC circuits. Equations such as $$\zeta = \frac{R_s}{2} \sqrt{\frac{C}{L}}$$ $$Q = \frac{1}{2\zeta}$$ ...
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1answer
39 views

Neglecting certain elements in deriving the current of a series RLC circuit

The current at resonance in a series RLC circuit is described in the bottom derivation, along with it being plugged into the formula for finding the voltage across the inductor in the circuitw: I ...
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1answer
73 views

RC-LC network equals lowpass filter of third order?

As far as I know only this are two lowpass filters (R-C1, L-C2) of order 1 and 2 respectively. Is it possible to denote this circuit as Low-pass filter of third order? Or is it possible to transform ...
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2answers
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Eliminating the resistance variable in the total resistance/reactance equation of a series RLC circuit

Assuming that we have a simplified equation from a simple series RLC circuit where the total resistance/reactance in the series RLC circuit is equal to 100 times the resistance R: How do we modify ...
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1answer
76 views

Building a series RLC circuit using a given resonant frequency and bandwidth value

Assuming that we have to build a simple series RLC circuit in such a way that the its resonant frequency must be 200 krad/s and its bandwidth as 20 krad/s, we have these components: Resistor: 1000 ...
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1answer
62 views

How do I determine the unknowns for this equation?

Suppose a series RLC circuit in series with a 12 V battery and a switch initially opened. R = 100 Ω, L = 100mH and C = 10uF. L and C are initially discharged. A t=0 the switch is closed. I want to ...
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1answer
76 views

What is the meaning of current at infinite time for a series RLC circuit formula

I am reading this doc. At one point, the author says the current equation form a critically damped series RLC circuit when a step function is applied is: \$ I_L(t) = I_{\infty} + (B_1 + B_2t)e^{-\...