# 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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38 views

### Unexpected resonance behaviour in LC tank resonator coupled to Cockroft Walton

I am creating a powerbase for an instrument that requires a potential difference that increases in discrete steps, and am attempting to power it with a Cockroft Walton (CW) voltage multiplier circuit. ...
44 views

### Why does my resonant converter add more losses?

I am currently designing a DC/DC converter transmitting energy from a solar panel to a load, using a transformer. The model of my circuit can be found on this figure: To migitate the losses, I have ...
36 views

### Does the inductance of a power source matter when calculating the capacitance for a LC tank Circuit

I want to connect a capacitor in parallel to the primary of a transformer so as to resonate it (experimental purpose) and I'm powering the primary of the transformer from a Variac. Do I need to factor ...
185 views

### Series RLC - how does resonance amplify?

A series RLC circuit has a resonant frequency f0. If I apply a sinusoid at frequency f0 to this series RLC circuit, the output of the RLC should be a oscillation at frequency f0 with an amplitude ...
71 views

### Calculating resonant frequency

Here is my attempt: Can someone explain to me how to proceed? How do I deal with the negative sign here? If I get the resonant frequency now, it will be complex. Am I not supposed to use the negative ...
40 views

### What exactly is a ballast [closed]

I've been working on building a solid state Tesla coil. A big issue for me is getting a proper ballast. I am fairly new to the Tesla coil game and have made small spark gap ones and a Slayer exciter, ...
78 views

### Resonance vs Undamped response

Why does this book say that resonance only occurs in an RLC circuit? If I have a two pole complex conjugagte system where the damping factor is low, there will be a resonant peak in the frequency ...
1 vote
113 views

### How to improve a Tesla coil?

I've recently built a relatively big Tesla coil. It is a larger version of the Slayer exciter but with 2 big MOSFETs. The same circuit, with a smaller coil produced small arcs without a top load, and ...
78 views

### Is the resonant frequency as defined for a second order transfer function same as the frequency at resonance in a second order electrical circuit?

When I studied second order system and thus natural, damped and resonant frequency I wondered if the resonant frequency I find using the formula $w _ { r } = w _ { n } \sqrt { 1 - 2 D ^ { 2 } }$ ...
47 views

### Drop in Amplifier High Frequency Gain without Large Power Capacitors

I have designed a simple class AB audio amplifier circuit which can be seen below. I am simulating the amplifier and have used a single, 100uF capacitor for C3 and C4. The simulation is being run ...
69 views

### Can a LC circuit generate frequencies in the Gigahertz range or higher?

For instance, if you took a bunch of off the shelf capacitors and arranged them in series and a bunch of inductors and arranged them in parallel, could you make the resonant frequency of the LC ...
48 views

### Resonant frequency of RLC circuit if for two values of omega we have same max amplitude current

Original question: An alternating current is flowing through a series LCR circuit. It is found that the current reaches a value of 1 mA at both 200 Hz and 800 Hz frequency. What is the Resonance ...
221 views

### Techniques for taking a transfer function and finding its resonance frequency

I've been doing problems out of my circuit analysis textbook by Ulaby, Fawwazz et al. to study for an upcoming exam. I am having serious trouble producing a transfer function and with such finding the ...
1 vote
157 views

### Blocking oscillator, Slayer exciter drawing too much power

I am trying to build one of these using an air-core coil. I got it oscillating but have to cut power off after 4 seconds as it starts to heat up (can't hold it with my fingers.) The transistor is not ...
45 views

### Should the top torus of a Tesla coil be cut?

Dosen't the top load torus act like one turn coil in short circuit? Doesn't it "steal" (decrease) the energy transfer to the arc? As a load, it has an inductive reactance (1 turn solenoid.) ...
33 views

### Impedance matching source with tank circuit

Is it necessary to impedance match the source (pulsed DC) with the capacitor in a parallel LC tank circuit in order to successfully charge the capacitor and achieve resonance in the tank circuit?
1 vote
82 views

### sensitivity and frequency-stability of capacitor-based oscillator circuit

I am constructing a capacitive transducer which changes capacitance as a function of changes in other physical properties. The capacitance is about 0.1~0.5 nF range, and I want to detect about 0.05% ...
118 views

### Multiple resonances in a circuit

So I have been struggling a little to understand why when we measure the impedance of the inductance over a large frequency range multiple resonances occur. To do so, I model a 2 turns inductor in ...
1 vote
64 views

### Help in understanding a Capacitive Voltage Transformer

I have been reading up about CVT’s and trying to comprehend some of the parts of the typical circuit which include: A potential divider (C1 & C2). An inductor tapped from the potential divider. A ...
1 vote
93 views

### How would you find the quality factor of this RLC circuit?

I have been trying to find the quality factor of this RLC circuit for some time now. My method is trying to find the equivalent series RLC circuit and calculate the resonant circuit. When I work ...
1 vote
215 views

### Metal Detector Coil Design

I have finally settled on a metal detector design on mine will be based on with one big issue, (Tx wire diameter: 0.6mm, Rx wire diameter 0.3mm, 55 turns each) I would like to increase the coil size ...
104 views

### LT Spice: parallel RLC circuit resonator giving weird frequency response?

I am trying out the following parallel RLC circuit configuration: On trying out other similar parallel circuits (like with an RL coil in parallel with C or with RC and RL branches in parallel) I got ...
127 views

### Resonant LC filters on a spherical capacitor [closed]

In the setup below, the circles are plates of a capacitor, and there are two LC filters mounted on it. Would the current prefer to pass via the filters if they are tuned to resonate at the frequency ...
129 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 ...
1 vote
299 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 ...
173 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 &...
56 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 ...
81 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 ...
450 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 ...
1 vote
105 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....
195 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 ...
111 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 ...
122 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 ...
119 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 ...
155 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 ...
239 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 ...
72 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 ...
1 vote
94 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. ...
337 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 ...
99 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.
37 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 ...
1 vote
63 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 ...
1 vote
117 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 ...
45 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. ...
1 vote
58 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....
50 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 ...
54 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. ...
1 vote
160 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, ...