Use this tag for circuits that only contain passive components, such as resistors, capacitors, and inductors. This includes RC, RL, LC, and RLC circuits.

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Using KCL/KVL to derive differential equation of a mixed RLC-ciruit

I have the following LTI sinusoidal circuit, and I am trying to derive its differential equation using KCL and/or KVL. I need this to derive the Power Factor as function of the components, so I can ...
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1answer
44 views

Differential equation mixed RLC-circuit, C parallel to RL

I am having trouble finding the differential equation of a mixed RLC-circuit, where C is parallel to RL. It is a steady-state sinusoidal AC circuit. I need it to determine the Power Factor explicitly ...
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2answers
41 views

Network Analysis problem

I am not able to get the concept of how to calculate the output voltage. What I did was- I assumed the network N as such- simulate this circuit – Schematic created using CircuitLab ...
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2answers
54 views

AC transient analysis for LR series circuit for a given AC source?

How can we formulate the current for an LR series circuit which has an AC sine source? The current formula must include both transient current and steady state current. So the i(t) function should ...
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2answers
28 views

Settling time for an LR circuit with an AC sine source

How can we mathematically relate the settling time for an LR circuit with an AC sine source? By settling time I mean the time taken for the circuit reaching to steady state from transient state. This ...
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1answer
55 views

Does the physical distance from electrolyc capacitor to inductor matter?

I am designing simple LC circuit (L=470uH, C=1000uF) for 12V / 12A (1 Ohm load): As you can see, I did do some soldering already (without too much or noob thinking). The capacitor and inductor ...
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1answer
28 views

Can I use barrier rectifier as a diode in bulk converter circuit?

I have this LC circuit which will work under 12V and quite high load (10-20A): The diode D1 must be a shottky diode but the only similar thing I have at the moment is actually 3-leg MBR3045CT ...
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3answers
462 views

Using LC filter instead of RC filter in mains powered circuits

Above is a dimmer circuit. In some of these circuits I see a toroid inductor together with a capacitor forming a low pass LC filter which is called choke filter. My questions are: Why is RL used ...
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3answers
48 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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6answers
1k views

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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1answer
93 views

Alternatives to motorized variable capacitor?

I want to dynamically fine-tune the capacitor (about 100pF) of an RLC series resonant circuit, so as to keep it tuned despite variations of the coil's environment. Operating frequency is ...
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2answers
41 views

implementation different than simulation

I have to build the below series RLC circuit , and output its bode diagram using NI ELVIS Instrument Launcher. It is for a bandpass filter, so the output is taken across the resistor. Before ...
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2answers
39 views

Audio Mixer Passive Attenuator Circuit

I'm currently designing a digital audio mixer. One common thing found on audio mixers is a optional 20dB pad on the input. I've seen some attenuator circuits but all of them require you to know your ...
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1answer
41 views

parallel rlc voltage source

I am learning about circuits and I have some questions regarding circuit initial condition: - no initial energy stored before switch is closed - there is current at L1 at t = 0- I am wondering: ...
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2answers
26 views

Network Function of a Band-Pass Filter

So I've been trying to derive a the network function for a Band-Pass filter. I use voltage division to get a relation for the voltage output across the inductor. simulate this circuit – ...
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3answers
162 views

Operation of LC circuit in Frequency Modulation with simulation and linking it to the basic principle of frequency modulation [duplicate]

Can somebody help how message signal (words spoken near microphone) is modulated using LC circuit and how lc circuit oscillates at particular frequency by applying dc voltage. In the below circuit ...
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1answer
45 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
481 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
270 views

Does this oscillator have a name?

I found this oscillator schematic and I hope to find more information about it.
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2answers
85 views

What is the pole frequency of a three-phase LC filter?

Suppose I have this configuration: Assume L1=L2=L3 and C1=C2=C3. What is the pole frequency of this filter? Edit: As mcmiln says, this is not identical to the question here: Cut Off Frequency in ...
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2answers
82 views

RC circuit with two capacitors

Figure out the Vout wave form of the following circuit: ( assume the name of the 9u capacitor to be C2 and not C1) Is there any way to intuitively plot the waveform by understanding the behavior of ...
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2answers
61 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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1answer
45 views

Impedance of a circuit that contains a 2 port network

simulate this circuit – Schematic created using CircuitLab So, firstly, find the y parameters of a network ( says the assignment). Which I did. Now for the impedance I get the a ...
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1answer
31 views

Noise figure of a passive network at a temperature different from room temperature

Given a passive network at room temperature, the noise figure is the ratio between the output noise power density pw and and the output noise power density due to the source pwS F = pw/pwS = ...
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1answer
49 views

How to find differential equation satisfied by \$u_{R_{equivalent}}\$, \$u_{L_{equivalent}}\$ or \$u_{C_{equivalent}}\$ in complicated RLC circuits?

When i'm given simple RLC circuits i know how to find the expression for each voltage, for example the expression of \$u_R\$ the voltage between the borns of the resistor \$R\$, or the expression of ...
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1answer
15 views

T-axis scale of a solved ODE

When I was calculating the following netwerk: Where given was: R=5,L=1,C=4,V_C(t)=10,I_T(0)=-2,V_in(t)=20. So the ODE that we get was: $$ \begin{cases} ...
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1answer
81 views

LC Tank Tuner for Super Regenerative Radio

There seems to be very little literature to explain the practical construction of a radio and how a super regenerative circuit actually act as a selector, amplifier, how a antenna is actually to be ...
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1answer
62 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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1answer
51 views

Non-resonant RLC band-pass filter

To create a band-pass filter using an RLC-circuit, i drew the following circuit (assuming R is given as 120): The corresponding transfer function is $$ H(\mathrm{j}\,\omega)=\frac{120\, C\, ...
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1answer
132 views

Measuring Q and Bandwidth of an RLC series circuit using Oscilloscope

I have a HNC Lab assignment coming up. As part of the prep for the lab work we have been given an RLC series circuit for which we had to calculate some values such as volt drop , Wn, Q and Bs, which ...
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1answer
86 views

Second-order Band-Pass Filter Gain Confusion

If I derive the equation for a bandpass filter (in this case, critically damped) from the RLC transfer function, I get a different result than I would get otherwise by combining the transfer functions ...
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1answer
62 views

What is the back voltage generated by this inductor in this practice problem?

The circuit is in a steady state, and the switch is lifted at t=0. In (a), i calculated the current i and the voltage v at the instantaneous moment that the switch is lifted. The current is 2A and ...
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2answers
75 views

time constant confusion of second order system

For first order systems, its easy to get the time constant by using thevenin concept. Suppose i have a second order system ,for example consider a two stage cascaded LOW PASS FILTER with identical ...
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1answer
91 views

In which of the LCR circuit the charge will decay faster?

Our instructor gave this problem. Cc << C. At time t = 0, the capacitor C has charge Q. In which circuit the charge Q will decay faster. Its answer is Charge Q decays faster in (A). ...
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3answers
352 views

What is the role of capacitor C3?

Here you can see the schematic of an LC oscillator. When I change the value of C3 it changes whether I have oscillations or not. For example if C3=10u there are not stable oscillations, and if ...
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1answer
61 views

In clamper circuit why RC>>T ? and why diode becomes reversed biased as capacitor becomes fully charged?

In clamper circuit why time constant is very very greater than time period of the signal i.e, RC>>T where R=resistance, c=capacitance, T=time period. why diode gets reversed biased as soon as the ...
2
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2answers
119 views

What does happen if the ratio of an ideal transformer is complex?

I have seen two solutions, both of then containing a paradox: Firstly, current and voltage ratio are inverse AND conjugate. In this first case, the two-port matrix is not symmetric (non-reciprocal). ...
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1answer
129 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 – ...
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1answer
49 views

LC Filter Attenuation

Hi I built a simple LC low pass filter and I supply it with a 1 volt peak to peak ac voltage at 200 Hz from a function generator. My cutoff is set at 700 Hz and I have selected my circuit components ...
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3answers
169 views

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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1answer
189 views

Filtering capacitors and inductors on power supply, how to choose and size?

I know this is fairly simple, and I get why these components are there. However, I do not fully understand why the certain values are picked and what the end filtering result is. Is the inductor in ...
2
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1answer
114 views

Power absorbed by a resistor in a crossed circuit

The given problem above is asking for the power absorbed by the resistor R given R = 1 Ohm. According to my professor, the two inductors do not cross so I redrew the circuit into the one shown in ...
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1answer
71 views

Why is the output of a series LC circuit sinusoidal?

How to analyze this circuit? Why is the voltage across the inductor(red plot) and capacitor(green plot) sinusoidal?
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1answer
68 views

Is the circuit a Parallel RLC if there is a voltage source in between capacitor and inductor?

simulate this circuit – Schematic created using CircuitLab As the schematic shows, there is a voltage source in between capacitor and inductor. Is it a valid Parallel RLC circuit. For ...
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2answers
701 views

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? ...
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2answers
159 views

What does a LC circuit in parallel to a speaker do?

I'm designing crossovers for my rear channels; a 2500 Hz 3rd order butterworth between an 8 ohm ribbon tweeter and two 4 ohm woofers in series (8 ohm load). While my original plan was to use two DPDT ...
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1answer
175 views

Looking for Tables of Chebyshev I Lumped Filters, for Various Ripple values (in dB)

I have tables of Chebyshev I filter design only for 0.5dB ripple. I need the tables for other ripples. I can't find them on the internet. Could anyone point me to the right direction? Thanks in ...
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2answers
190 views

Why is this a 7th order circuit?

This is the circuit: I saw it in a book. It said that this is a 7th order circuit. From theory we know that the order of linear passive circuits is determined by the sum of capacitors and ...
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0answers
106 views

Guidance designing low-pass filter for audio circuit power supply

I'm developing a BeagleBone Black cape that has, among other things, and audio CODEC and 10 W amplifier. The “other things” include a connection to WS2812 LEDs, which generate a lot of PWM switching ...
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1answer
65 views

Calculating Transfer Function of passive circuit

I have the following passive circuit: I want to calculate it's transfer function \$V_{out}(s)/V_{in}(s)\$. My thoughts are: Part I: The voltage on the capacitor in the center (call it \$V_c(s)\$) ...