# Questions tagged [resonance]

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### 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 ...
66 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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### 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 ...
33 views

### Impedance of a piezoelectric element

I come across the impedance versus frequency plot for a pieaoelectric element. Source: here It says that the impedance is minimum at the resonance frequency, but why is that so. Whats the physical ...
67 views

### Capacitors capacity in an RLC circuit that is in resonance

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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### 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 ...
83 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 ...
70 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 ...
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 ...
46 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 ...
114 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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### 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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### Quartz Crystal and Resonance Frequencies

Let's consider this equivalent electrical model of a crystal: The evaluation of its series self resonance frequency is quite simple: it is sufficient to impose that the reactance of L1 is equal and ...
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### RC Snubber for synchronous MOSFET (SMPS)

I am trying to understand the theory of RC snubber for synchronous buck converters. Some statements seem to be contradictory to me in the below mentioned application notes: “The snubber capacitance ...
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### Always starting LC colpitts oscillator

Is there a way to make an LC oscillator that works in most circumstances? Which is able to start up an keeps oscillating for a wide range of inductors? I'm asking this because I made a LC oscillator ...
170 views

### How do we define resonant frequency for a circuit, that has arbitrary combination of resistors,capacitors and inductors?

How do we define resonant frequency that has arbitrary combination of resistors,capacitors and inductors? For instance inductors and capacitors may neither be in series or parallel, but may ...
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### WPT compensation topologies

I'm experimenting with compensation topologies for inductive WPT systems and have a small confusion. The general WPT industry uses compensation networks to cancel out reactive components in the ...
51 views

### Electronicaly switching parallel LC circuit components

Let's say I have mentioned circuit and I want to be able enable/disable one of the 1uF capacitors to change the frequency of the LC circuit. I would like to do this electronically with a micro-...
176 views

### How do I determine the resonance frequency of this circuit

I have a circuit that consists of a voltage source in series with a resistor and a parallel of an inductor with a capacitor. I have to determine the resonance frequency of this circuit. I am very ...
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### 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 ...
150 views

### Wien bridge slowly decaying oscillator

I want to build a resonator that slowly (~3 seconds) decays without a stable oscillation. I've tried using a simple RLC circuit without luck - I've got ~1-2ms decay time at maximum; so, I've turned my ...
142 views

### LC Resonance circuit : output voltage

What I understand(FACTS) : In for example a LC resonance circuit the output can many times greater than the input voltage. At resonance the impedance of the inductor is the same as the impedance of ...
73 views

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 ...
304 views

### why do resonant inductive coupling circuit operate at high frequencies?

Just as the title says. Whenever I read a research paper on wireless power transfer via resonant inductive coupling the authors just mention frequencies that range in the kHz and Mhz range, but none ...