Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

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.

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 .

See Wikipedia's article on resonance for more information.

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Ceramic resonator changes and maintains frequency when touched

I'm experiencing a weird phenomenon with a ceramic resonator test circuit, where the frequency of its output can be changed by touching the circuit with my finger. The circuit would maintain this higher frequency oscillation indefinitely as long as…
crossroad
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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 combinations. If L is small, C is big or vice-versa. Or they…
griffin175
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Why do these two sets of seemingly identical capacitors behave differently?

I have two sets of almost identical-looking capacitors which show different behaviour: The ones on the left (which are definitely these MLCCs) act as I would expect, but the ones on the right (which we think were a previous order of the same but…
llama
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Could a copper RF cavity like this be reasonably expected to have a Q > 7000?

The paper Measurement of Impulsive Thrust from a Closed Radio-Frequency Cavity in Vacuum (H. White et al, J. Propulsion & Power, November, 2016, http://dx.doi.org/10.2514/1.B36120) refers to an unusually shaped copper cavity with a resonance at…
uhoh
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Antiresonance of multiple parallel decoupling capacitors: use same value or multiple values?

My quesiton: Is it better practice to put same-valued capacitors in parallel of capacitors of different values to decouple the high-frequency noise caused by digital ICs? Background Digital IC need a decoupling capacitor close to their supply pins…
andresgongora
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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 it advantageous over an RLC circuit?
Doubt
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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 high temperature of the transistor. The second…
Michael George
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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 solving it like this: P = (I1^2)*R1 + (I3^2)R2 = R(I1^2…
Dangz1
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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 be the the Fourier components, but this doesn't…
Stein
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LM337 Unstable regulation

For an audio project, I need a low noise +/- 12V supply. I have a linear power supply of +/- 15V and I decided to use the LM317 and LM337 to decrease the voltage to 12V. The circuit that I use is the following, I followed the recomendation on the…
Kostr
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What is the frequency at which a series RLC circuit stores maximum energy?

I was reading about the quality factor of a series RLC circuit. The quality factor is defined as $$2\pi*\frac{\text{maximum energy stored}}{\text{total energy lost per period}}$$ Here maximum energy stored is calculated at the resonant frequency. My…
Lelouch Yagami
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Simulating a tuning circuit in LTspice

This is the tuning circuit that I'm trying to simulate in LTspice: My input signal is the sum of a 500 kHz, 1 MHz, and 1.5 MHz sine wave, all modulated at 5 kHz. The 5 kHz waves carried by each of the frequencies are 90 degress apart from each…
kene02
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Why do crystals have 0° phase shift at series resonance?

I am trying to understand the inner workings of crystal oscillators, but I do not understand why the current has 0° phase shift at series resonance. To my knowledge this is the equivalent circuit for an crystal oscillator. simulate this circuit –…
Brent Morris
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Benefits of class E resonant rectifier

I have recently been reading about VHF switch mode power supplies and one thing that I haven't been able to figure out is what really is the point of resonant rectification. I could understand the point from the load matching point of view i.e. the…
Trafi
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Does a voice coil vibrate at the same frequency as the source sound file?

As a disclaimer I know very little about this so I'm probably describing this in a very imprecise way. Say you generated a sine wave on your computer at 800Hz and played it through a speaker. Would the speaker also vibrate at 800Hz?
Leftover Salad
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