Questions tagged [resonance]

For questions about resonance, the phenomenon in which the amplitude of an electrical circuit's output increases when the frequency of its input is equal to or near the circuit's natural frequency. Consider also using the "frequency-response" tag.

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90 views

On the topic of Quality factor in arbitrary RLC resonance circuits

In question Quality factor in arbitrary RLC resonance circuits, the OP asks about the Q of more complex circuits other than simple series or parallel RLC topologies. The responses I read, in ...
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2answers
292 views

Do all passive circuits possess resonant frequencies? Can we prove it?

Let's say we have any circuit, with two available terminals, consisting exclusively of ideal constant-resistance resistors, ideal constant-capacitance capacitors, and ideal constant-inductance ...
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1answer
154 views

How to find optimal resistant value to dissipate energy from RLC circuit?

This is my personal problem not any acadamic or homework. Given this circuit We will charge the capacitor with V1 until it fully charge then switch to RLC circuit at, t = 0 simulate this circuit &...
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3answers
51 views

How exactly does a Tesla coil primary winding transfer energy to the secondary winding?

We know that the Tesla coil has a low coupling coefficient so most of the energy is transferred by using electric resonance. How exactly does it transfer the energy? When the oscillating magnetic ...
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1answer
58 views

Can I put high voltage thyristors in series & ZVS to handle MHz frequency resonance?

I'm trying to scale up a circuit that calls for a MOSFET and a ZVS to be capable of dealing with high frequencies (1-20 MHz.) I'm aiming to crank it up to 10 kV and would prefer the systems in series ...
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1answer
444 views

Skim excess power from a resonant circuit without draining it?

If you have a resonant circuit, oscillating at its self-resonant frequency, how would you extract the excess power without draining it fully? A high Q resonant transformer impedance matched to the ...
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1answer
67 views

How to solve a parallel RLC circuit when the resistor and the inductor are in series

I have a parallel RLC circuit where the inductor is in series with the resistor. The value for the frequency is 200hz and the value for the current of the circuit is 5mA. The experimental answer is 1....
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4answers
106 views

Why is the primary of the Tesla coil placed at the bottom of the secondary?

The primary winding of the Tesla coil is wound around only the bottom portion of the secondary coil and in Wikipedia, they mention that this configuration illustrates the operation of the secondary as ...
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3answers
104 views

Parallel resonance with two difference frequencies

This is an old tutorial question. In this problem, circuit has two different frequencies. My question is how to find resonance frequency? Can we consider this two different frequency as half power ...
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1answer
90 views

What LC tank circuit is needed for a 318 MHz remote control 9 DIP switch for a garage door controller transmitter opener using the PT2262 IC?

I want to use the PT2262 remote control encoder to create a garage door remote. This is just for fun. (I realize I can get a universal controller 318 MHz 9-DIP switch remote for about $16.) I was ...
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1answer
96 views

Don't resonant converters operate at the resonant frequency?

I had the assumption that resonant mode switching converters operat at the exact resonance frequency of the LLC tank and other parasitic elements inside the transformer, but as far as the controller ...
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0answers
85 views

Increase the power in an induction heater

I am working on an induction heater of 3 kilowatt. I want to increase the power upto 5 kilowatt. What should I do? I have built zero voltage switching type induction heater. I used a 3uf capacitor ...
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2answers
107 views

Can somebody explain how this piezo-driver circuit works?

The source is this video. I have countless number of questions about this schematic but there is the most pressing ones: Why L1 is connected to SP1 in such a strange way (right in the middle, and not ...
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1answer
71 views

Too high frequency when building an LC circuit

I am trying to build an LC oscillator for a thesis at my university. I'm aiming for ~3.5 MHz, I would a Helmholz pair with 30 windings each coil and a radius of 1.5 cm, which I calculated to have ...
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71 views

Resonant Transformer / Resonant Inductive Coupling

I´m trying to build a resonant transformer (or a resonant inductive coupler, I don´t know if the names fit to the topology I´m showing, anyway). The idea is to develop a high voltage on a capacitor. ...
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2answers
205 views

Why do ham radio operators say that a full wave dipole isn't resonant?

Every reputable antenna book that I've read says that dipole antennas are resonant at integer multiples of a half wave length. Wikipedia describes resonance as: the phenomenon of increased amplitude ...
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1answer
97 views

Need help with a resonant frequency question

I DON'T WANT THE SOLUTION I just don't understand where the "100" (highlighted) came from.
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36 views

Is inductor current always AC current in dc-dc resonant converters?

Is it true that all resonant dc-dc converters with one resonant inductor Lr and capacitor Cr have ac inductor current (going both positive and negative direction)? Note that AC here I mean it goes ...
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2answers
59 views

Time based solution of an LC circuit at resonance

I am trying to solve for the voltage across the capacitor in an LC circuit driven by a sinusoidal voltage at the resonant frequency, \$\sqrt{\frac{1}{LC}}\$. My solution contains a scaling factor of ...
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1answer
102 views

Does the self inductance and velocity factor of the elements of a dipole antenna change its resonant frequency?

Below are well known equations from Wikipedia for the resistance and reactance in the impedance of a dipole antenna. where a is the radius of the conductors, k is the wave number 2πf/c, η0 denotes ...
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32 views

Tuning the resonance frequency using varactors in a RCL circuit (and how to avoid noise)

I'm a physics student trying to run a few simulations on a RCL circuit. I don't have too much experience with electronics and could use some help on some basics on how to tune the resonance frequency. ...
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0answers
51 views

Buck input decoupling capacitance and efficiency

I'm working on an high frequency buck (>10 MHz) and there's a problem with the input decoupling capacitance, the one used to filter battery harmonics and have a more stable voltage with less ripple....
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0answers
41 views

Trying to Dampen a Boosted LC Circuit

I am currently implementing the circuit shown below where the first stage is a boost converter and the second stage (output stage) is an LC circuit with a boost topology. The goal is to take a 24V DC ...
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1answer
40 views

Lser of capacitor not equivalent to a separate inductor in LTspice?

I just noticed a strange issue in LTspice and I am wondering what I am doing wrong. This is about capacitors with series resistance and inductance: Example 1: A simple bandpass. Behavior seems ok. ...
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1answer
99 views

Problem simulating electrolytic capacitor at high frequency (GHz+ range)

simulate this circuit – Schematic created using CircuitLab I am simulating a circuit in LTspice in which I use an aluminum electrolytic: C=100µF, Rser=0.25, Lser=5n Due to some other components, ...
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23 views

Mutual inductance and coupling coefficient

I need to know how I calculate the coupling coefficient and mutual inductance in series-parallel (SP) topology in wireless power transfer system work at a resonant frequency of 6.78 Mhz
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1answer
43 views

Finding the Gain Equation of a Boost Converter with LC Resonator

I am trying to implement the following datasheet circuit in a project. The circuit is a boost converter with an LC circuit resonator (L3 and C4 resonate). I am trying to find the DC transfer function ...
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2answers
155 views

Why do crystals have 0° phase shift at series resonance?

I am trying to understand the inner workings of crystal oscillators, but I do not understand why the current has 0° phase shift at series resonance. To my knowledge this is the equivalent circuit for ...
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1answer
194 views

Can someone help me make this circuit work?

I am trying to implement the circuit described in this paper in LTspice. The circuit is shown below: The paper claims that the circuit can be used to measure the resonant frequency of the coupled LC ...
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29 views

Charaterization of waveguide to coaxial adapter

I'm trying a method to characterize a high frequency waveguide to coaxial adapter( 2-port network). For this, I use 3 adapters A1, A2, A3. After a TRM calibration, I measure A1 connected with A2 with ...
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1answer
69 views

Can someone help me understand the exact working of this configuration of a Colpitt's oscillator?

So I came across this Collpitt's oscillator in a research paper that I am thinking of implementing but it looks quite different from other configurations and I would really appreciate some help ...
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59 views

Control of a resonant capacitor

I am working on a data transmission system. For the data signal to be fully amplified, I want the circuit to resonate. I would like the signal to be already fully amplified across the inductors and ...
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47 views

Wireless power transfer - 6.78 MHz resonant circuit

I work on wireless power transfer. I used (EPC9065: High-Frequency ZVS Class-D Power Amplifier) I have a resonance circuit series-parallel topology work on 6.78 MHz, when I connect the circuit and ...
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2answers
62 views

How do I see the resonance of a high-impedance coil with a VNA?

When it comes to measurements with VNA, my experience tells me that whenever there is a "dip" in the S11 parameter, your takeaway should be that there is a resonance there (this is how the ...
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1answer
1k views

Finding resonant frequency or damping ratio from Bode Plot

I am working on a question where I have to estimate a transfer function from its bode plot. I plotted the asymptotes of this bode diagram, and was able to find out that this is 3rd order system with ...
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1answer
61 views

Crystal frequencies

the context is that I am working on project which uses a 32 768 Hz quartz oscillator used for a uC. My questions are: I have read that series resistance should be low (25 to 100 Ohm) otherwise it can ...
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3answers
226 views

Wien Bridge Oscillator: Why does equating the real part to 0 give the gain equation?

I am learning about Wien bridge oscillators. Following Experiment No. 9: WIEN BRIDGE OSCILLATOR USING OPAMP, they use the following schematic: They then arrive at the following equation half-way down ...
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0answers
72 views

Two resonances in the admittance of capacitor C

I have this question that has been haunting me for a week now. I was given a measurement file of a previous student. Allegedly, they are the measurements of the admittance of a circuit that is ...
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1answer
31 views

Quality factor multiple definitions

On studying RLC circuits, I have come across two definitions of Q factor. One is obviously the measure of selectivity and goes as this: The other is this: Is there any link between these 2 ...
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4answers
1k views

Definition of RLC resonance frequency

I have found that a commonly mentioned definition for the resonance frequency in an RLC circuit is defined as the condition where the capacitive and inductive reactances cancel each other, resulting ...
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3answers
108 views

Single value capacitor or two different in parallel for filtering the power supply for microcontroller

I am trying to design power supply for the STM32F446 for my PCB. I wonder if I should stick to the Datasheet of STM32F446 Page 71 and use two capacitors or be careful about it and maybe just use one ...
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146 views

How can I play midi on this tesla coil?

I've made several small tesla coils, however I wanted to buy one that was compact and powerful, so I bought this one. I'm assuming it is a drsstc, since it has a half bridge of mosfets or igbts, which ...
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4answers
136 views

Resonance Frequency of system with two inductors

I am trying to derive a formula for the resonance frequency of the following circuit: The piece that is giving me trouble are the two inductors, that (although I might be wrong) cannot be further ...
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0answers
63 views

LC series circuit resonance beyond voltage limits of programmable capacitor - solvable with gain stage?

I am replicating a design where a mechanical tuning capacitor is in series with an inductor antenna, in order to achieve resonance at certain (hundreds of kiloHertz) frequencies. I am looking into ...
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3answers
116 views

Crystal radio receiver

Why is a parallel LC circuit used to filter out the right frequency from the antenna? Shouldn't it be in series? We have a maximum impedance at resonant frequency if we connect in parallel, so why isn'...
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0answers
51 views

Design for a PLL Auto-Locking Circuit

I am looking into electrolysis efficiency using an auto-locking PLL circuit that is supposed to latch onto the resonant frequency of the electrolysis cell, a frequency determined by the inductance of ...
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2answers
107 views

Frequency that quartz crystal can handle

I understand that when an applied voltage signal enters the quartz crystal, it mechanically vibrates. Now, let's say that the voltage is 1 kHz and the quartz crystal is 32.728 kHz, can the quartz ...
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1answer
226 views

Why can generators be damaged by series capacitors (SSR)?

Specifically I am talking about generation that uses steam to generate turbo spin (steam cycle) like nuclear or natural gas plants. I have been learning about Subsynchronous Resonance (SSR), which is ...
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1answer
101 views

Resonant frequency of RLC circuit

Analysis I'm trying to find the resonant frequency for this circuit simulate this circuit – Schematic created using CircuitLab Writing up the node voltage equation for \$V_o \$ $$\frac{V_o-V_{...
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1answer
109 views

Reducing resonance in a piezoelectric ultrasonic transducer

I am using a piezo transducer to launch an ultrasonic pulse in air, at a frequency of 125kHz. A picture of the received waveform is attached. My question concerns how I can (electronically) limit the ...

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