Questions tagged [resonance]

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A question about ringing phenomena and resonance

Below is an LC circuit fed by a 1V 10kHz square-wave. As you see the output is a sinusoid, which would be max. if it were produced by an input at resonance frequency. And here below the same circuit'...
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Why do we need to calculate the resonant frequency for antennas?

Is there any reason to cancel the inductive and capacitive reactance out for an antenna operating on 13.56 Mhz ? Why do we need to cancel the reactances out I followed a tutorial when designing a T-...
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1answer
176 views

How to decide the resonant frequency

I have a circuit of the following form. Circuit diagram: How do I decide the resonant frequency ? What is the criteria here to select the resonant frequency ? Background: I am testing the transfer ...
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160 views

Capacitive Trimmer - Why is it full of silicone glue?

I bought two of these trimmers from Digikey to tune a resonant circuit, but the screw is covered with silicone. I dug out the silicone with an xacto so I could turn the screw. Why is the silicone ...
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1answer
402 views

Why in a voltage driven parallel RLC circuit (at resonance), the current of the inductor has a DC component?

I'm refreshing my knowledge on LC/RLC circuits, and an interesting thing came up that puzzled me. I'm doing simulation on parallel a RLC circuit (in LTSpice), which is driven with a sine voltage ...
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4answers
242 views

Finding the resonating frequency

Here in the given figure is a parallel circuit. The goal is to find the resonating frequency (\$f_0\$). How can we find out the resonating frequency in that case? This formula won't work i guess. $$\...
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1answer
651 views

Coefficient of coupling in Resonance circuit

How to find coefficient of coupling in B/w 2 inductor are in series RLC CKT
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111 views

Why does 7.6Mhz signal start appearing?

I am using a reference design that modulates a 8Mhz carrier DC square wave in simple on-off keying at 10bps. I wanted to change the carrier to 125kHz. I took out the 56pF capacitor in C4 and ...
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3answers
772 views

Intuition for resonant, natural, and oscillatory frequencies of RLC circuits?

I can't seem to get these concepts straight. To start, what are the official definitions of each? My current understanding is that: \$ w_0 = \sqrt{\frac{1}{LC}} \$ is the natural (and resonant?) ...
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1answer
2k views

What are typical failure modes of piezoelectric transducers?

How do piezoelectric transducers in ultrasound probes fail? I have a machine whose elements are being driven by an amplifier that is very noisy. The signal I see arriving from the power amplifier ...
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0answers
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How to find the resonant frequency of a human body?

I've read that the human body has resonant frequencies somewhere around 50MHz. I also think it would be interesting to look for values in other ranges like 10-100 kHz. I'm wondering how to build a ...
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1answer
158 views

Finding voltage in RLC circuit

C = 1 uF L = 2.2 mH r = 1.7 ohm f = 4000 Hz Vin = 2.6 V I have this RLC circuit where I need to find Vout. I have tried it by finding the Q factor and the multiplying it with Vin which gave me ...
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2answers
690 views

Detecting metal, detecting a coil - which is easier?

This is a metal detector question, with one assumption. That is, the detecting is done by eddy currents in the target changing the resonant frequency of the detecting coil. The question then becomes, ...
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2answers
413 views

calculate resonancefrequence RLC||C2

I try to find the formula for resonance frequence in a circuit in series R-L-C1 and parallel to that C2. simulate this circuit – Schematic created using CircuitLab I know only the formula for ...
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1answer
78 views

Cannot figure out resonance of an LRC circuit

this is my first time here, nice to meet you all. In one of my classes we are studying the resonance of an LRC Circuit where the C branch is in parallel with an RL branch. This circuit is driven by ...
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1answer
1k views

Inductor's self-resonant frequency: Do we want it to be high or low?

Inductor selection always confuses me. There is a spec for inductors as self-resonant frequency. For example, on digikey, as SR frequency of inductors increase, the price may increase or decrease. But ...
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5answers
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Measure temperature on a moving engine valve: transfer voltage and reading wireless?

I am an automotive engineer with very very little or almost zero electrical/electronics experience. I am working on logging real time temperature values on an engine exhaust valve and mounting a ...
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2answers
636 views

How can I obtain the transfer function of an unknown circuit from its bode plot?

I have the following bode plot of some unknown circuit: (The lines denote the -3dB frequencies, f_low and f_high.) I'm guessing it's a high-pass resonant filter. I don't have phase information, other ...
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1answer
653 views

Can resonance increase frequency?

I would like to know what would happen if a capacitive load is connected to the secondary of a transformer. I simulated the circuit on Proteus. The inductance of the secondary coil was 0.1 H and the ...
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0answers
170 views

Frequency of Natural Resonance with Parasitic Component due to Oscilloscope

So, I've just performed a lab on measuring the resonance of an LCR circuit. I rearranged the circuit so each time the component in question had one lead on the ground plane, and then measured it's ...
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1answer
217 views

Is it possible to make a 150 Hz resonant circuit from RF toroids?

I want to make an LC filter resonant at 150 Hz using a 2.5 uF 400 V CBB61 capacitor and inductor. They are shown in the image below. The toroid core looks like an RF toroid core but I don't know the ...
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2answers
649 views

Series resonant circuit with parallel capacitor

Series resonant circuit with parallel capacitor: What is effect of that parallel capacitor (C2) on the circuit? And what happens if we remove this capacitor?
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1answer
373 views

Ni multisim 11 resonant circuit problem

I'm trying to simulate parallel resonant ciruit. I'm also useing Bode analyzer but the result is different from what it should be. My circuit: And the result is: Do you know what I am doing wrong? ...
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2answers
374 views

What is trimmable “peaking”?

I'm studying Jim Williams application note AN-104 - Load Transient Response Testing for Voltage Regulators, in which he describes an FET-based load transient generator, what might commonly be called ...
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1answer
53 views

Multiple characteristic frequencies determined by one capacitor

I'm trying to figure out how to construct a filter with the following constraints. If it isn't possible, this would also be acceptable, albeit disappointing (and I would hope for some kind of proof). ...
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5answers
2k views

Resonance frequency of an RLC circuit

simulate this circuit – Schematic created using CircuitLab Is it safe to consider the resonance frequency of a second order RLC circuit to be alway equal to 1/sqrt(LC) or the transfer ...
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1answer
137 views

Noise in DC causing unwanted LC resonance

I have a circuit like this: The part on the left generates AC signal. The part on the right detects whether AC is running through the branch when S1 is closed. I use a resonating LC circuit which is ...
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3answers
8k views

How to overcome transistor heat in slayer exciter?

I build this circuit and it works but I have two problems. The major problem is that the transistor becomes very hot quickly. I burnt my transistor due to excessive heat. How can I get rid of the very ...
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2answers
141 views

How do you block a signal with a tank circuit?

I have a signal generator outputting 60 hz AC. I've connected the output to a capacitor (922uf) and inductor (0.0076H) which are in parallel with each other creating a tank circuit. These two values ...
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6answers
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Why are crystal oscillators used in clocks instead of RLC circuits?

The timing of quartz clocks is regulated by a crystal oscillator. This crystal oscillator effectively forms an RLC circuit. If this is so, what properties does a crystal oscillator have that makes ...
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1answer
142 views

FFT Sampling and observation time

I have the task: Buildings resonance between 0.8Hz... 1Hz. These frequencies can break glass and must be avoided, so engineers need to know the exact resonance frequency. How many FFT points are ...
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1answer
831 views

Understanding Resonant Frequency in a Series RLC Circuit

After spending a couple of hours on the internet searching for answers I'm hoping Stack Exchange can help me. Recently, using simulation software, I used an oscilloscope to calculate the resonant ...
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0answers
666 views

Resonant circuit using LTSpice

I'm a college student and I was supposed to draw the Bode-plot of the following resonant circuit. I obtained this. My questions are: shouldn't I have obtained a bell-shaped curve? How can I find the ...
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4answers
2k views

AC Circuit + Parallel resonant band-stop filter

My EE book says about this circuit: "The parallel LC components present a high impedance at resonant frequency, thereby blocking the signal from the load at that frequency. Conversely, it passes ...
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4answers
775 views

Is there a clever way to use a small variable capacitor where a larger capacitance is required?

I am designing an activity where students should band pass a song to find a hidden message at 1000Hz. Problem I have considered using a notch filter and tank circuit, but using the formula $$f=\...
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7answers
9k views

LC circuit, bigger L than C, or bigger C than L?

So if I want my LC circuit to resonate at 20MHz, I just use the formula, \$F=\frac{1} {2\pi\sqrt{LC}}\$. Using available inductor and capacitor values, there are lots of different possible ...
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1answer
104 views

A few questions about AC Circuits

Part A - Series RLC Circuit 1st. Get a Q-factor from the measured voltages at resonance; I know the general formula for Q=1/R*sqrt(L/C) L is 4.7 mH and C is 0.01 microF. R is 100 ohm. If I get Q from ...
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1answer
1k views

Is electrical impedance at its maximum or minimum, at the acoustic resonant frequency of the material?

For example, if piezo disc has lowest resonant frequency of 4kHz. At that frequency, would the electrical impedance be at its maximum or minimum?
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2answers
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What is causing this voltage overshoot?

this is a series resonant half bridge, used with a loosely coupled coils (so there is significant leakage inductance) a decoupling capacitor for the half bridge is used (not shown in schema) (maybe it'...
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1answer
1k views

Loaded Q-factor of parallel RLC with series resistive load

So I have been studying resonant RLC-circuits, and have come to loaded Q-factors. At present I am trying to figure out the Q-factor of a circuit like this: simulate this circuit – Schematic ...
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1answer
101 views

Is it possible to model a microwave resonator in SPICE [duplicate]

I just wanted to know if it was possible to model a microwave resonator in spice software or somehow import it from somewhere to spice to carry out analysis. Also if it is not possible to model the ...
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3answers
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Getting resonant frequency in LC circuit with L as air core coil

im trying to find inductance of the air core coil,i read that in LC parallel circuit with known capacitor value we can find unknown inductance value by the formula so need to find 'f' resonant ...
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2answers
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LC Circuit problem!

Initially when the switch is closed ,at that instant the inductor is a short and capacitor is open ,so the diode cathode is floating ,so how does the diode conduct? Does the LC circuit resonate? My ...
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1answer
939 views

Ferrite bead resonance

I have checked a reference design because I use the same microcontroller for my thesis. The PLL power input is filtered by a ferrite bead and a capacitor. I have simulated the circuit and I found that ...
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4answers
561 views

Why does my rectangle function on a FPGA look like this?

I programmed my FPGA to create a simple 1 MHz rectangle function. But when I display the resulting function on my oscilloscope it shows some oscillation after the edges. At first I thought this might ...
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1answer
106 views

MCP2515 with CSTCE16M0V53

I need a 16MHZ resonator for my MCP2515. Can I run it with a CSTCE16M0V53-R0 or would that not be sufficient?
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4answers
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simple induction heating circuit problem

Update: got it working... Fix: replace diodes for proper schottky. Result: got oscillation but no resonans. Fix: replace cap with 1 uF polystyrene. result: got resonans. But now my problem is i cant ...
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1answer
2k views

Cut Off Frequency in three phase LC filter

Good afternoon all My question is what will be the formula to calculate cut off frequency of attached LC filter. Its a three phase LC filter. \$(L1=L2=L3= 6.1 \mathrm{mH}) \;\mathrm{and} \;(C1=...
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578 views

Why is a receiving circuit in e.g. RFID made resonant with a parallel capacitance instead of a series capacitance?

Take for example the schematic below of a inductive receiving circuit in RFID, where we want to maximize the voltage over the load resistor R4 (R3 is the resistance of the inductive coil, and the ...
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1answer
108 views

Is it possible to generate a tone using an LRC circuit?

I've been thinking about the possibility of hooking a resonant LRC circuit to an amplifier and hearing the oscillations as sound, hence making it possible to make music instruments using these ...