# 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-...
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 ...
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 ...
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 ...
242 views

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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 ...
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 ...
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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### 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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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 ...
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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### 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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### 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 ...
939 views

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 ...
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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### 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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### 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 ...
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=...