Questions tagged [resonance]

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19 views

Series and parallel resonance - influence of resistance [closed]

What effect does the resistance have on series and parallel resonance?
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2answers
45 views

Resonant frequency and maximum signal width

I've seen resonant frequency being defined as the point where the input signal is in phase with the output signal (So reactance/susceptance is 0). However conceptually, teaching material seems to link ...
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3answers
57 views

LC receiver - resonance frequency

I am building simple LC receiver. I have to use a 30 mH coil and "catch" 30-40 kHz frequencies. By my calculations I need to use +- 800 pF capacitor. Unfortunately I have only 100 pF ...
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1answer
71 views

FM demodulator LTspice

I am now designing an FM demodulator circuit. And the first step is turning FM into AM, so I could use envelope detector afterwards. Modulator circuit is designed using Colpitts topology. So frequency ...
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4answers
85 views

LTSpice: One component value dependent on another's value

I've asked this on the LTSpice group and am getting conflicting answers. I have a tank circuit in a sim I'm working with, and I need to look at the effect of changing the L value across a range (...
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30 views

simulation of this task

Try to make simulation of this task with program of your chose. Can someone please do this simulation with a program like Multisim and upload the simulation,because i dont have the program.
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1answer
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Parallel Resonance circuit Q factor formula Clarification

I'm confused with the formula of Q factor in parallel resonance because in other books its different is it okay to be like this ? A. This is from the Electronics Tutorial Website A. This is from a ...
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48 views

RLC or LC and why

simulate this circuit – Schematic created using CircuitLab I've run in to some trouble, working out wether i need to use a RLC or just a LC tank for my circuit. My circuit is an H-bridge, where ...
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1answer
52 views

Is this parallel resonant circuit problem fully constrained?

Is there a single answer to the following question? Design a band-pass filter using a parallel resonant circuit to meet the following specifications: \$BW=500Hz, Q=40, I_{C_{max}}=20mA, V_{C_{max}}=2....
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4answers
2k views

What are the resonant frequencies for this RLC circuit?

What are the resonant frequencies in the following circuit? Full disclosure: this is question 34 on page 655 of Pearson's Electronics Fundamentals 8th Ed. I recognise the parallel section comprising ...
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2answers
55 views

Why output voltage becomes less when beyond resonating frequency?

In a class C amplifier (Figure A), every time the transistor turns on in every "pulse", the collector current becomes saturated. This charges the capacitor to its maximum (Vcc). This capacitor will ...
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36 views

Can a LC tank circuit amplify frequencies beyond the bandwidth region?

The LC tank circuit in a class C amplifier has a specific resonating frequency of 1/(2piLC). Depending on the Q factor its frequency may vary inside its bandwidth. Does this mean my class C amplifier ...
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0answers
37 views

Impedance and resonance frequency of a bias tee

I am a beginner trying to learn about combining impedances and solving for the resonance frequency. I am solving a circuit: simulate this circuit – Schematic created using CircuitLab and I ...
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4answers
114 views

Resonance frequency of filter independent of resistance?

I have the following circuit and problem. What is the resonance frequency of the filter, \$ \frac{\mathbf{I}_{out}}{\mathbf{I_{in}}} \$? I found this rather straight forward formula for the ...
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3answers
60 views

How can you find Quality Factor of an arbitrary RLC Circuit?

I'm having a trouble with this circuit. Apparently I know how to deal with a simple RLC circuit but this one is tricky
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30 views

Switching between capacitors causing ringing

I have a series resonant circuit where I have a fixed value inductor. I have few a capacitors which are connected to the inductor through some mechanical relays. I am changing the frequency and ...
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2answers
396 views

Why is the ouput so low in this LC resonant circuit?

159.2Hz is the resonant frequency. Shouldn't the output be at least same as the input at resonance? EDIT: I was hoping to see voltage amplification when the circuit was at resonance without using ...
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1answer
38 views

Pi filter with resonance in power supplies

I have recently read in older book (I don’t have it on me, it was from at least 90’s) about LC filter with resonance in chapter about filters in power supplies. It looks like regular pi LC filter but ...
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1answer
47 views

How can I find the capacitance value changes that will result in linear tuning steps in a parallel LC circuit?

I've found articles that derive the shape of a mechanical capacitor plate so as to achieve linear frequency tuning for linear dial rotation as in each degree of rotation shifts the frequency the same ...
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2answers
101 views

Why does the \$ Q\$-factor depend on the resonant frequency?

The \$Q\$-factor is defined as $$Q=\frac{\omega_{0}}{\Delta \omega},$$ where \$ \Delta \omega\$ is the bandwidth around the resonant frequency \$ \omega _{0}\$. For a series RLC circuit, $$\Delta \...
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1answer
84 views

How to get a flat band frequency response with an inductive input

I have a primary inductor L1 connected to a voltage source with frequencies varying from 0.5MHz to 15MHz. This primary inductor induces a voltage across a secondary inductor via coupling and I want to ...
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2answers
59 views

Can multiple LC circuits be connected to the same antenna to listen to different frequencies all at once?

I am very new to this. I am trying to make a radio that listens to multiple stations at once and signal processing circuit that separates frequencies from a microphone signal.
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1answer
44 views

Value of loop gain for steady state oscillations

I was reading on a book (High-Frequency Oscillator Design for Integrated Transceivers, J. van der Tang, Dieter Kasperkovitz, Arthur H.M. van Roermund) this paragraph about the start-up condition for ...
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1answer
32 views

Meaning of coupling factor for a resonance cavity

I was reading this paper about resonant cavities, and on page 6 it introduces the concept of coupling factor β, which is defined as the ratio between the power loss in the total circuit (including the ...
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2answers
57 views

Equivalent circuit of a simple transformer?

EDIT: My question is: How can you translate the first circuit into one that uses simple (linear) electrical elements and, as a result, can be solved using mostly Kirchhoff's laws? I am trying to ...
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0answers
27 views

Initial conditions in multi-state Tesla Coil circuit

Half a year ago I posted this quesion about a Tesla Coil resonant circuit which got an amazing answer that helped me understand the resonant frenquency of such circuit. Now I've returned to that ...
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2answers
66 views

Active RC filters

I was reading paragraph 4.2 of this book about Active RC filters. It says that if we want to get a band pass filter with high selectivity (i.e. high quality factor Q) we should use resonant circuits (...
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1answer
43 views

Is the transformer leakage inductance increasing or decreasing VS. size

I have built an sine filter for a small inverter that feeds a transformer 250VA. The filter is basically a LC filter, that uses leakage inductance of the transformer with a capacitor connected in ...
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3answers
90 views

Why is the impedance zero at cutoff frequencies in a series RLC resonance circuit?

I see that, in many derivations in the frequency analysis of series RLC circuits, \$X_L - X_c = R\$ or \$Xc - X_L = R\$ is considered at lower and higher cutoff frequencies. So does that mean that the ...
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1answer
61 views

Resonant Radar — How aspect independent is it? [closed]

Resonant Radar: transmitting at a bandwidth that encapsulates nearly the natural resonance frequency of a reflective object in hopes of illuminating it upon return (higher amplitude.) I have read ...
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1answer
71 views

Why is my LC filter Bode flattening out to 20dB/dec in my Simscape simulation?

I just made an LC filter Matlab Simulink simulation and I don’t know why the Bode diagram is flattening out. After the resonance it falls steeply, but after that it sets at 20dB/decade. Shouldn't it ...
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1answer
40 views

Transmission Line with Short Circuit and Inductor as Loads

let's consider this situation in which the two ports of a transmission line are connected to a short circuit and to an inductor: The transmission line is supposed to be lossless. My book makes a ...
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0answers
22 views

Measurement of Q and uncertainty

I am measuring the \$S_{21}\$ of some microwave cavity resonator. From the \$S_{21}\$ measurement, I try to extract the resonant frequency and the \$Q\$ of my resonator. To do that, I use a fitting ...
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4answers
338 views

What is the difference between a tank circuit in an oscillator and a resonance circuit?

I understand that if a charged capacitor is placed with an inductor (and then remove the power supply,) the capacitor and inductor will exchange energy back and forth, it will basically oscillate and ...
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1answer
71 views

Ambiguity in the Definition of Resonance Frequency

we know that in a series LC circuit the resonance frequency is defined as that frequency in which the total impedance offered by the circuit is zero. We also know that in a parallel LC circuit the ...
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1answer
36 views

Tuning Resonant Cavities

I have seen that some resonant cavities are equipped with some external screws, called tuners, which can be used to vary the resonance frequency. Can you explain me the physical reason with which to ...
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1answer
67 views

What are the “poles” of a signal (after it's reflected perhaps)

I desire to learn about "estimating the poles of a resonant signal", specifically the complex natural resonance of objects. However, I don't know what "poles" are. What would you suggest I look up ...
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1answer
58 views

Can an electric resonator (like a microwave) be used to effectively heat things other than water at different frequencies?

For example, could you determine the resonant frequency of slag in an ore sample and melt it by putting it in an electric resonator at the appropriate frequency?
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1answer
277 views

Quality Factor Formula

I read on many books this formula to calculate the quality factor of a series between a resistance and a reactive component (L and/or C): Now let's consider the series between a resistance and a ...
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0answers
43 views

Standing waves modes inside a cavity resonator

Follow up postI have researched the concept of a rectangular cavity resonator and have come across the term modes. For a given frequency one can have multiple modes. What do these multiple modes ...
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95 views

Struggling to get an amplified sine wave over a small inductor at low frequencies

I am building a power amplifier circuit to amplify a sine wave over an inductor from a function generator. However because the inductor is small and i'm running at a low frequency I am getting ...
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1answer
58 views

Function Generator amplifier to drive resonance circuit help

I have a model resonance circuit that is excited with an auxiliary winding and I need to build an amplifier to be able to amplify the current from the function generator in order to drive the ...
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1answer
81 views

Capacitors capacity in an RLC circuit that is in resonance [closed]

So if its in resonance that means XL=XC right? anyway thats how I started I∠=Irms∠=7.07/sqrt2 ∠30° A ω=10^3 Z1=R+jXL=1+1∠90°=sqrt2∠45° Z2=-jXC=1∠-90° Ztotal=(1/Z1+1/Z2)^-1=sqrt2∠-45° U∠=I∠*...
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1answer
57 views

Resonant Circuits do all capacitors count towards resonant frequency?

I am trying to design a variable frequency oscillator for use in a superheterodyne FM receiver and have been reading First Steps in Radio (http://www.arrl.org/first-steps-in-radio). In this example a ...
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2answers
120 views

Will a parallel capacitor placed before a series inductor be capable of self-resonance?

If a parallel capacitor is placed in a circuit before a series inductor or ferrite bead (CL instead of an LC), will this combination be capable of any self-resonance? Or does the inductor have to be ...
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4answers
149 views

Quality factor in arbitrary RLC resonance circuits

I am looking for a way to calculate the quality factor in arbitrary RLC circuits not just standart series or parallel circuits. It would be great, if anybody could provide a formula and some further ...
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2answers
55 views

uC-adjustable harmonic oscillator circuit @100W

I'm looking for a circuit that performs a harmonic oscillation while its resonance frequency can be controlled with a microcontroller (preferably via an analog signal). The circuit has to drive a set ...
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0answers
103 views

My slayer exciter circuit doesn't work properly

today I tried to make my own Tesla coil circuit according to the schematic below, except that I have changed the number of turns on the secondary and primary so could get a higher output voltage (1 to ...
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3answers
356 views

Why can RLC resonance be dangerous for electronics

There is a lot of information about RLC circuits and resonance, and many times it is mentioned that when a series (parallel) circuit resonates, a really high voltage (current) can be found across the ...
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1answer
44 views

How is Q for surface acoustic wave devices measured?

I do not have a good understanding of Q, the quality factor. I get the basic concept that it has to do with energy losses within a system, particularly oscillating systems like resonators. Higher Q ...

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