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Questions tagged [resonance]

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Resistor's behaviour at high frequencies

Looking at the impedance vs. frequency graph 1) At low-frequencies Z=R and hence it would be a straight line. 2) For mid-frequencies, Z decreases possibly due to capacitance, but I'm not sure ...
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41 views

What can cause an RLC circuit to fail? [on hold]

What are some conditions that can cause an RLC circuit to fail and what are the safety considerations when making an RLC circuit?
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47 views

mechanical excitation of tuning fork and electrical readout

For my experiment, I am trying to mechanically excite a quartz crystal tuning fork and measure the voltage across the tuning fork. When the TF is driven at its resonance frequency, there should be ...
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15 views

Principle and generalization of proportional-resonance controller

simulate this circuit – Schematic created using CircuitLab We can introduce the model of \$u(s)\$ into the controller \$K(s)\$ to realize high accuracy control. \$u(t) = 1\$, i.e. \$u(s) = 1/...
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1answer
30 views

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 ...
0
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1answer
37 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-...
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21 views

network analysis

How to find the resonance frequency(wo) of the following circuit: Assume C1=C2=C and C1 is initially charged to V1+V2, while C2 is completely discharged. Find the resonance frequency wo by ...
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2answers
70 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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1answer
40 views

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 ...
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2answers
68 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 ...
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1answer
59 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 ...
0
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1answer
38 views

LC circuit powered by MOSFET generates not stable

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 ...
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1answer
141 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 ...
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2answers
70 views

Analysis of an LC circuit antenna

I want to analyse a parallel LC circuit in terms of inputs and outputs as I am studying them in the context of using them as a tuned antenna. However I am unsure of where to identify the inputs and ...
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0answers
38 views

frequency response of transducer

I need help reading a spec sheet for a microphone. I'm conducting frequency analysis to determine the natural frequency of a batch of specimens. According to ASTM E1876 7.Apparatus(7.3 Signal Pickup):...
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1answer
68 views

How does this circuit output 25kHz?

This circuit doesn't use a gate drive, so I am trying to understand how it can output 25kHz. A friend of mine told me that it does so with the use of LC resonance; the capacitor and inductor next to ...
0
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1answer
80 views

finding small R in series RLC circuit

Hello! I have an device which is equivalent circuit is RC as follows in the image I shared: R is supposed to be 0.5Ω and C supposed to be 30nF, but it can vary a little bit between device to device. ...
3
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1answer
41 views

Problem with load switching at capacitor resonant frequency

I was watching this video (EEVblog #1117 - PCB Power Plane Capacitance) where the author analyses the impedance curve of the capacitance formed between a PCB's power planes. The comparison with a ...
0
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1answer
35 views

Neglecting certain elements in deriving the current of a series RLC circuit

The current at resonance in a series RLC circuit is described in the bottom derivation, along with it being plugged into the formula for finding the voltage across the inductor in the circuitw: I ...
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2answers
57 views

Eliminating the resistance variable in the total resistance/reactance equation of a series RLC circuit

Assuming that we have a simplified equation from a simple series RLC circuit where the total resistance/reactance in the series RLC circuit is equal to 100 times the resistance R: How do we modify ...
0
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1answer
64 views

Building a series RLC circuit using a given resonant frequency and bandwidth value

Assuming that we have to build a simple series RLC circuit in such a way that the its resonant frequency must be 200 krad/s and its bandwidth as 20 krad/s, we have these components: Resistor: 1000 ...
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1answer
28 views

Series and Parallel RLC Circuit [closed]

I am trying to build a resonant circuit for data communication between coils. Which would be better, a series or a parallel resonant circuit? What is the difference between them and in which ...
1
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1answer
43 views

Inductive Charging 2 layer coil transfer to 1 layer receiver. Any issues?

I am looking to incorporate a inductive charging mechanism into a project I’m working on. On the receiving side I only have room for a single layer coil design. For my transfer side I have more ...
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0answers
85 views

Resonant, autotuned nanopulser

My need is to build (or purchase, if existent) a nanopulser, but not an ordinary one: it has to have some specific characteristics. The premise is: I have a device which acts as a variable capacitor ...
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0answers
56 views

bandwidth and phase-locked loop

I've been told that phase-locked loop (PLL) increases the bandwidth and therefore makes the time constant smaller. (\$ \tau = 2Q/\omega_0 \$ and I understand \$Q \propto 1/ \delta\omega_0 \$) I ...
0
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1answer
60 views

Trying to understand the magic the author of this PDF did explaining the critically damped equation

I am reading this doc about the equations for the step function for the RLC circuit, critically damped solution. At page 16 we have these lines... But there is a magic between these lines... How ...
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2answers
95 views

quartz tuning fork and its series and parallel resonances

Based on the explanation here, I understand that if you electrically drive a tuning fork, you would first see a peak (resonance) and dip (antiresonance). I just tested the frequency response of a ...
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0answers
26 views

Derivation of the equivalent model of a resonant converter

I'm trying to understand how a resonant converter works, but one thing confuses me, and this thing is the derivation of the equivalent model using first harmonic approximation (FHA) method. At first ...
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2answers
171 views

Need help solving a problem with ac resonance circuits from my uni book

simulate this circuit – Schematic created using CircuitLab Okay I have struggling with this problem for some time and I cant figure out how to solve it. The circuit is in resonance! I tried ...
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1answer
96 views

Purpose of 2530 Hz resonator?

I stumbled upon this advertisement. I would like to know what is the purpose of this 2530 Hz 3-pin ceramic resonator?
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1answer
218 views

Parallel RLC Resonance bandwidth

Good day ,I need help in understanding a practice problem that my professor gave us. A parallel resonant circuit has Q = 20 and is resonant at ωO = 10,000 rad/s. If Zin = 5kΩ at ω = ωO what is ...
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1answer
100 views

Why does the MRI machine does not rip off its own electronic components

Maybe it's a lame question but it came up to my mind recently. Usually, Electronic equipment or metallic materials are forbidden in MRI rooms. Also, there are no electric sockets present in that room. ...
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0answers
64 views

Three phase induction motor 3

For most common/casual 3 phase induction motor, If we connect proper capacitors in series or parallel, can we get resonance like LC circuit ? thank a lot. star or delta . doesnt matter.
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2answers
92 views

What is the effect of PCB trace length to a capacitors frequency response?

I want to know the effect of PCB trace length to a capacitor's frequency response, especially in terms of bypassing and decoupling applications. For instance in the above simplified PCB, we have a ...
2
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1answer
73 views

Self-resonance frequency of chip inductors

I am studying chip inductors and here's one of the frequency response: There are more than one resonance frequencies exist in a single inductor. When we say inductor resonance frequency, it usually ...
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2answers
50 views

Analysis of Ringing Oscillator

I am looking at an analog synthesizer circuit the design of which incorporates several "ringing oscillators", which look like this: I understand that this is a resonant system that enters oscillation ...
1
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2answers
147 views

LC circuit, resonant frequency

I am working on the question in the image attached, and I am having trouble with part b) I found part a by using the formula of resonant frequency for a first order LC filter: w=1/sqrt(LC), and by ...
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3answers
93 views

Why is there a constant -1A current through the voltage source at resonance?

Below circuit is at resonance. Shouldn't the circuit offer infinite impedance to the voltage source ? I thought, then the current through the source would be 0A. But the simulation shows that the ...
0
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3answers
96 views

Predicting decay time of a resonant bandpass filter?

In a typical resonant bandpass filter, resonance is set as none at 0 and full at 1, such that the filter rings infinitely at 1 and not at all at 0. If there is a two-pole resonant bandpass filter, ...
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2answers
94 views

Water level detection using non contact sonic sensors

I have been working on a project, where I need to find the water level of underground borewells with a diameter of around 6-10 inches and a depth of up to 100 meters. I have been researching a lot ...
5
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1answer
307 views

Understand simple FM transmitter, inductance, resonance

I learn electronic , I try to understand this project, simplest FM transmitter : The project is describe here : https://makezine.com/projects/super-simple-fm-transmitter/ The inductance of L1 (Strip ...
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0answers
908 views

Smallest circuit for Ultrasonic Mist Maker or humidifier

I am working on Ultrasonic Mist Maker or humidifier circuit, but does not found any good circuit. As search on google that we have to make about frequency 1.6MHz to convert water into mist. using ...
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3answers
197 views

Why is wireless power transfer done between two coils at their self-resonant frequency?

I was reading this paper about wireless power transfer via strongly coupled magnetic resonance: http://www.ijirem.org/DOC/1_Wireless%20Power%20Transfer%20via%20Strongly%20Coupled%20Magnetic7a7f01ee-...
0
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1answer
63 views

Deriving resonance frequency of RLCC circuit

I am trying to determine the resonance frequency of an RLC resonator with added capacitor, as shown below: simulate this circuit – Schematic created using CircuitLab Two cases are easy to ...
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0answers
24 views

How Mutual Inductance affects Q factor?

If there is a magnetically coupled pair of inductors in an AC circuit, how will it affects the resonance frequency and Q-factor of the circuit? In particular a circuit like this : If initially ...
0
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1answer
197 views

Need a little help with a Chinese tesla coil

I bought a little tesla coil kit that can play music. I soldered it all up, and a friend of mine distracted me at the last second when I was hooking it up... I blew the original "BD243" transistor up ...
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1answer
119 views

How to determine whether a system is in resonance with an externally applied voltage - RLC Circuit

Forgive me if this is the wrong forum. This is a problem in my Differential Equations class involving RLC circuits, but we have not gone over the concepts of these circuits in class. I'm given the ...
0
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1answer
83 views

MOSFET gate drivers [closed]

This circuit requires two gate drivers to drive a push-pull configuration, can anyone recommend any since the source of the top MOSFET is floating it isnt as simple as a low-side driver. They would ...
4
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3answers
105 views

Choice of capacitor for high frequency application

I want to recreate this wireless power transfer system that utilizes two resonating LC circuits and induction for power transfer. I want to know the best type of capacitor to use in the LC resonator ...
0
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1answer
42 views

L-C Circuit (Series) connected with AC power

Good morning I am learning about L-C circuits, because it is very interesting, so in my simulation software I built the circuit, which can be seen in the below image. Why, and how i build it ? I ...