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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What is the pole frequency of a three-phase LC filter?

Suppose I have this configuration: Assume L1=L2=L3 and C1=C2=C3. What is the pole frequency of this filter? Edit: As mcmiln says, this is not identical to the question here: Cut Off Frequency in ...
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73 views

RC circuit with two capacitors

Figure out the Vout wave form of the following circuit: ( assume the name of the 9u capacitor to be C2 and not C1) Is there any way to intuitively plot the waveform by understanding the behavior of ...
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48 views

How do you block a signal with a tank circuit?

I have a signal generator outputting 60 hz AC. I've connected the output to a capacitor (922uf) and inductor (0.0076H) which are in parallel with each other creating a tank circuit. These two values ...
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1answer
39 views

Impedance of a circuit that contains a 2 port network

simulate this circuit – Schematic created using CircuitLab So, firstly, find the y parameters of a network ( says the assignment). Which I did. Now for the impedance I get the a ...
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1answer
28 views

Noise figure of a passive network at a temperature different from room temperature

Given a passive network at room temperature, the noise figure is the ratio between the output noise power density pw and and the output noise power density due to the source pwS F = pw/pwS = ...
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39 views

How to find differential equation satisfied by \$u_{R_{equivalent}}\$, \$u_{L_{equivalent}}\$ or \$u_{C_{equivalent}}\$ in complicated RLC circuits?

When i'm given simple RLC circuits i know how to find the expression for each voltage, for example the expression of \$u_R\$ the voltage between the borns of the resistor \$R\$, or the expression of ...
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1answer
13 views

T-axis scale of a solved ODE

When I was calculating the following netwerk: Where given was: R=5,L=1,C=4,V_C(t)=10,I_T(0)=-2,V_in(t)=20. So the ODE that we get was: $$ \begin{cases} ...
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50 views

LC Tank Tuner for Super Regenerative Radio

There seems to be very little literature to explain the practical construction of a radio and how a super regenerative circuit actually act as a selector, amplifier, how a antenna is actually to be ...
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1answer
48 views

Understanding Resonant Frequency in a Series RLC Circuit

After spending a couple of hours on the internet searching for answers I'm hoping Stack Exchange can help me. Recently, using simulation software, I used an oscilloscope to calculate the resonant ...
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1answer
34 views

Non-resonant RLC band-pass filter

To create a band-pass filter using an RLC-circuit, i drew the following circuit (assuming R is given as 120): The corresponding transfer function is $$ H(\mathrm{j}\,\omega)=\frac{120\, C\, ...
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1answer
98 views

Measuring Q and Bandwidth of an RLC series circuit using Oscilloscope

I have a HNC Lab assignment coming up. As part of the prep for the lab work we have been given an RLC series circuit for which we had to calculate some values such as volt drop , Wn, Q and Bs, which ...
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1answer
52 views

Second-order Band-Pass Filter Gain Confusion

If I derive the equation for a bandpass filter (in this case, critically damped) from the RLC transfer function, I get a different result than I would get otherwise by combining the transfer functions ...
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1answer
41 views

What is the back voltage generated by this inductor in this practice problem?

The circuit is in a steady state, and the switch is lifted at t=0. In (a), i calculated the current i and the voltage v at the instantaneous moment that the switch is lifted. The current is 2A and ...
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49 views

time constant confusion of second order system

For first order systems, its easy to get the time constant by using thevenin concept. Suppose i have a second order system ,for example consider a two stage cascaded LOW PASS FILTER with identical ...
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1answer
43 views

In which of the LCR circuit the charge will decay faster?

Our instructor gave this problem. Cc << C. At time t = 0, the capacitor C has charge Q. In which circuit the charge Q will decay faster. Its answer is Charge Q decays faster in (A). ...
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3answers
330 views

What is the role of capacitor C3?

Here you can see the schematic of an LC oscillator. When I change the value of C3 it changes whether I have oscillations or not. For example if C3=10u there are not stable oscillations, and if ...
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1answer
45 views

In clamper circuit why RC>>T ? and why diode becomes reversed biased as capacitor becomes fully charged?

In clamper circuit why time constant is very very greater than time period of the signal i.e, RC>>T where R=resistance, c=capacitance, T=time period. why diode gets reversed biased as soon as the ...
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2answers
101 views

What does happen if the ratio of an ideal transformer is complex?

I have seen two solutions, both of then containing a paradox: Firstly, current and voltage ratio are inverse AND conjugate. In this first case, the two-port matrix is not symmetric (non-reciprocal). ...
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1answer
74 views

Loaded Q-factor of parallel RLC with series resistive load

So I have been studying resonant RLC-circuits, and have come to loaded Q-factors. At present I am trying to figure out the Q-factor of a circuit like this: simulate this circuit – ...
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1answer
42 views

LC Filter Attenuation

Hi I built a simple LC low pass filter and I supply it with a 1 volt peak to peak ac voltage at 200 Hz from a function generator. My cutoff is set at 700 Hz and I have selected my circuit components ...
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3answers
122 views

Getting resonant frequency in LC circuit with L as air core coil

im trying to find inductance of the air core coil,i read that in LC parallel circuit with known capacitor value we can find unknown inductance value by the formula so need to find 'f' resonant ...
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1answer
98 views

Filtering capacitors and inductors on power supply, how to choose and size?

I know this is fairly simple, and I get why these components are there. However, I do not fully understand why the certain values are picked and what the end filtering result is. Is the inductor in ...
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1answer
103 views

Power absorbed by a resistor in a crossed circuit

The given problem above is asking for the power absorbed by the resistor R given R = 1 Ohm. According to my professor, the two inductors do not cross so I redrew the circuit into the one shown in ...
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1answer
65 views

Why is the output of a series LC circuit sinusoidal?

How to analyze this circuit? Why is the voltage across the inductor(red plot) and capacitor(green plot) sinusoidal?
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1answer
51 views

Is the circuit a Parallel RLC if there is a voltage source in between capacitor and inductor?

simulate this circuit – Schematic created using CircuitLab As the schematic shows, there is a voltage source in between capacitor and inductor. Is it a valid Parallel RLC circuit. For ...
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596 views

LC Circuit problem!

Initially when the switch is closed ,at that instant the inductor is a short and capacitor is open ,so the diode cathode is floating ,so how does the diode conduct? Does the LC circuit resonate? ...
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24 views

Computing the number of channels using frequency reuse factor

If a total of 50 MHz Bandwidth is allocaed to an FDD cellular network with TDMA/FDMA accessing and the system uses 2 channels of size 25 KHz each to provide full duplex voice service. How can I find ...
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2answers
118 views

What does a LC circuit in parallel to a speaker do?

I'm designing crossovers for my rear channels; a 2500 Hz 3rd order butterworth between an 8 ohm ribbon tweeter and two 4 ohm woofers in series (8 ohm load). While my original plan was to use two DPDT ...
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1answer
128 views

Looking for Tables of Chebyshev I Lumped Filters, for Various Ripple values (in dB)

I have tables of Chebyshev I filter design only for 0.5dB ripple. I need the tables for other ripples. I can't find them on the internet. Could anyone point me to the right direction? Thanks in ...
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2answers
180 views

Why is this a 7th order circuit?

This is the circuit: I saw it in a book. It said that this is a 7th order circuit. From theory we know that the order of linear passive circuits is determined by the sum of capacitors and ...
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84 views

Guidance designing low-pass filter for audio circuit power supply

I'm developing a BeagleBone Black cape that has, among other things, and audio CODEC and 10 W amplifier. The “other things” include a connection to WS2812 LEDs, which generate a lot of PWM switching ...
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1answer
55 views

Calculating Transfer Function of passive circuit

I have the following passive circuit: I want to calculate it's transfer function \$V_{out}(s)/V_{in}(s)\$. My thoughts are: Part I: The voltage on the capacitor in the center (call it \$V_c(s)\$) ...
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83 views

Quasi-elliptical vs pseudo-elliptical filters vs Chebyshev Type 2 filters

Are quasi-elliptical or pseudo-elliptical and Chebyshev Type 2 filters the same filter response? Quasi-elliptical or pseudo-elliptical filters appear to be defined as "... filters with finite ...
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201 views

Passive filter design, transfer functions and loading

I have been playing around with some basic passive filters (first order), really just to try and get a better understanding of the equations and transfer functions. I was talking to someone about ...
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1answer
212 views

Passive audio phase shifter (180°) - can it be done? [closed]

I understand that most analog hardware phase shifting circuits seem to use OpAmps to get their job done. I am trying to build a tiny, non-powered in-line adapter for Mp3-players and such to quickly ...
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1answer
173 views

USB switching power supply filter

Good afternoon fellow students of life, I have a particular question that relates to the use of a Duracell USB switching power supply as the main supply for a high sensitivity sensor board. Most of ...
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1answer
81 views

Combined RLC circuit phasor diagram?

We have a circuit in the picture below. What will the phasor diagram look like in case: $$I_C<I_L$$ and $$I_C>>I_L$$ ?
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1answer
32 views

A LC parellel tank problem

Image a simple RLC circuit as below: The source Vs can supply an AC current 40A max., if L1 is absent, the current flows through C1 can achieve 40A. And with the adjustable inductor L1, I wonder if ...
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1answer
77 views

What should be the source impedance and load impedance in LC filter design?

My aim is to generate analog signals with class-D amplifier. For that I am using the following configuration: Class-D-->Low-pass filter(LC)-->load(complex, real+imaginary) class-D amplifies my PWM ...
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2answers
60 views

Phasor diagrams for RLC series circuit?

So, here's the circuit: How can I make phasor diagrams for the circuit in case when $$I_C<I_L$$ and $$I_C>I_L$$ Edit: What made me confused is the current conditions, it's actually voltage ...
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128 views

do magnetic fields affects wifi signals? [duplicate]

I have note 4 and I have putted magnetic cover on it, and now sometimes if signals are low then if I put cover off then I can use my wifi connection and if I keep cover on it then it stops working. ...
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492 views

How does the RC time constant affect behavior of a passive integrator/differentiator?

I'm reading the first chapter of the AoE. I've come across this section on differentiator/integrator circuits and couldn't understand the math behind it. For the first picture, it says small RC ...
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1answer
48 views

Dual passive low-pass filter

I am building a class D amplifier and need to design passive low-pass filters for H-bridge with cut off frequencies at about 400 Hz. However, I am unsure about few things, this is the simplified ...
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70 views

Confused with network analysis

Can someone please explain me their workflow in solving the following transferfunction. I have to find the output-voltage Vo over RL, for an input-voltage of Vi. I'm not used to network analysis, and ...
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1answer
33 views

How much sensitive to thermal cycling are passive components?

One of my boards, which contain solely passive components, may be subject to high thermal cycling (up to +/-100°C, but tradeoff down to +/-30°C is possible). What sort of degradations can they ...
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1answer
68 views

instantaneous travel

Problem 9.7 of Basic Engineering Circuit Analysis asks one to "Find the instantaneous travel supplied by the source [...]" The word "travel" does not appear anywhere else in chapter 9. I suspect it ...
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1answer
78 views

Help solving a 2nd-order RLC circuit

This is the practice problem 8.9 of Fundamentals of Electric Circuits 5th Edition. Can someone help me with this question? I need a more detailed solution of this problem. Especially, what are the ...
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1answer
378 views

Damped RLC Circuit Equation

I'm trying to measure the inductance of a toroid with the use of a 555 in astable mode. Hopefully, by putting the toroid in parallel with a known capacitor and driving the circuit with a low duty ...
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1answer
103 views

Transfer function of damped RLC cricuit

I am currently in my final year of University and am completing my final year project. I have a circuit that I am analyzing as part of it and could really use some help. I am trying to determine the ...
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2answers
80 views

Will an impedance matching network also act as a filter?

Will a matching impedance network also act as a filter? I'm using a pi network and am wondering if I should also add a filter. I designed the pi network by using the program SimSmith and it consists ...