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Questions tagged [resonance]

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2
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1answer
88 views

Frequency dependent resistor in real inductor (air coil)?

I tried to measure the resonance frequency of some multi layer air coils. Typical parameters are 0.6 mm copper wire, 3 to 8 layers, and diameter and height are approx 50 mm. I solder a 1 Ohm resistor ...
0
votes
2answers
115 views

Was my circuit victim of capacitor self-resonance?

In order to generate a short pulse off a permanent constant current signal, I made this circuit. It works well except that it created a very high frequency ripple which wreaked havoc all over the ...
1
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3answers
126 views

Teaching about LC filters

I'm preparing to teach some people regarding filters, and I'm confused regarding the use of the LC-filter circuit, specifically the circuit below: simulate this circuit – Schematic created ...
0
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1answer
61 views

How to measure the impedance of a given coil? [duplicate]

What's the best way to measure the resistance and inductance of a coil at a given frequency? I need these parameters for my LTSpice-Simulation which assumes an RL series circuit. The coil has 8 ...
0
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0answers
47 views

Parallel resonant induction heater

I implemented a parallel LC induction heater using theory. I made a simple square wave Inverter providing a frequency of 20kHz to the tuned LC circuit. The problem I'm facing is that my tank is not ...
3
votes
1answer
66 views

What would be the consequence of the inductor saturating?

The following is a section from a book where it is talking about decoupling by LRC at supply terminals. I highlighted the sentence where I didnt understand: I read that if an inductor has an iron ...
1
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2answers
74 views

Find Voltage of inductor in LC series circuit with resistor in parallel

I have a LC resonance circuit with a resistor between the capacitor and inductor: simulate this circuit – Schematic created using CircuitLab I want to find the Voltage at L1, more specifically ...
0
votes
2answers
92 views

Direct FM generation using varactor diode

I am trying to generate a constant 1 MHz FM carrier wave. I have achieved it via LC parallel resonance circuit. Initially I let the switch B open and switch A closed, in order to charge the capacitor. ...
0
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3answers
93 views

Why parallel LC oscillator producing very high voltage?

I was trying to generate 1 MHZ frequency using LC parallel circuit using 2.53 mH inductor and 0.01 nF capacitor and I ...
1
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4answers
133 views

Confusing quartz crystal impedance graphs

I thought that at the series resonant frequency of a piezoelectric oscillator the impedance of the crystal would be the lowest, and at the parallel resonant frequency the impedance would be the ...
0
votes
1answer
54 views

Solving a circuit with a resistor in series with an LC circuit

I want to analyse a circuit that I've drawn above. It is a series connection of a resistor and an LC circuit (parallel type) driven by a sine wave of variable frequency. No assumptions can be made ...
1
vote
1answer
97 views

Why is my LC circuit resonant frequency way off?

I'm very new to oscillators but very keen to learn more so I connected this very simple circuit: where the voltage source is my signal generators and I have an oscilloscope connected across the ...
0
votes
1answer
58 views

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 ...
1
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0answers
51 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 ...
0
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0answers
18 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/...
0
votes
1answer
41 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
votes
1answer
43 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-...
0
votes
2answers
74 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 ...
0
votes
1answer
47 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 ...
0
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3answers
101 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 ...
1
vote
1answer
75 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
votes
1answer
43 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 ...
2
votes
1answer
193 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 ...
0
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2answers
154 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 ...
0
votes
1answer
71 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
votes
1answer
83 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
votes
1answer
62 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
votes
1answer
43 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 ...
1
vote
2answers
61 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
votes
1answer
101 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 ...
-2
votes
1answer
51 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
vote
1answer
46 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 ...
1
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0answers
87 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 ...
0
votes
0answers
76 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
votes
1answer
62 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 ...
0
votes
2answers
119 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 ...
0
votes
0answers
31 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 ...
8
votes
2answers
183 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 ...
-1
votes
1answer
105 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?
1
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1answer
267 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 ...
0
votes
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. ...
0
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0answers
70 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.
0
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2answers
114 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
votes
1answer
84 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 ...
0
votes
2answers
58 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
187 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 ...
0
votes
3answers
94 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
votes
3answers
104 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, ...
-1
votes
2answers
96 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
votes
1answer
378 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 ...