Questions tagged [passive-networks]

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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4
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3answers
828 views

Source-free, under-damped, parallel RLC with 2 intial conditions

I think I'm suffering from brain-drain. I'm trying to solve a 2nd order differential equation for the natural response of an under-damped parallel RLC circuit with initial conditions of \$I_L\$ and \$...
3
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3answers
908 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?) ...
2
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2answers
227 views

How to sketch the Bode diagram of the output filter of a Buck converter?

I'm trying to figure out the Bode diagram of the output filter of a Buck converter: simulate this circuit – Schematic created using CircuitLab Vout is ...
14
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2answers
2k views

How do you determine the effective resistance of a finite grid of resistors?

Disclaimer: I am a geophysicist with limited electrical engineering background. I am not sure if this problem is incredibly easy, incredibly complex, or completely nonsensical. My goal: Determine the ...
18
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3answers
7k views

Understanding USB Inrush Current Requirements

In relation to a previous question, I'm trying to understand the USB 2.0 requirements for inrush current. I understand the basic idea, but a few details are still unclear to me. The specification ...
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2answers
605 views

Logarithmically-spaced resistances using switches

If you want a linearly-spaced set of resistances, you can use a ladder of logarithmically-spaced resistors and short out different combinations, as described here. Is there a way to get a ...
0
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1answer
327 views

How to calculate the gain of a RLC tank filter?

I'm supposed to create a passive bandpass filter to select a reasonably sinusoidal 750 Hz signal from a 250 Hz square wave. Since we have very limited choices for the inductor (0.03 H) and capacitor ...
1
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2answers
878 views

Conjugate, non-conjugate and single poles in an RLC circuit system

In all the texts I encountered so far, I find the following pole-zero diagram example for an RLC series circuit: The transfer function for the above circuit can be found as: H(s) = XC/(R + XL + XC) =...
4
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3answers
2k views

Damping in an RLC circuit

In an RLC circuit,what criteria could be used to decide whether the system is overdamped or underdamped? Could we compare the maximum energy stored during one cycle to the energy dissipated during one ...
2
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4answers
959 views

A question about a debouncing circuit

I was reading a tutorial on debouncing the outputs of a rotary-encoder which are read by a micro-controller. Below is the circuit given: The writer of the tutorial claims the following: "In the ...
2
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2answers
125 views

Ideal LC circuit decays over time in LTspice

I was trying to simulate a transformer without a load, and setting an initial condition to observe how the energy will flow from the primary to the secondary circuit. I realized that the energy will ...
1
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1answer
62 views

Voltage exceed source voltage over a coil when opening a switch

Well, I have the following circuit: simulate this circuit – Schematic created using CircuitLab When the switch is closed for a long time, the current that is flowing trough the resistor \$R_1\$...
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2answers
115 views

Voltage spike at the coil when opening the switch [duplicate]

I've the following circuit: simulate this circuit – Schematic created using CircuitLab In my book they stated the following sentence: After that the switch is closed for a long time, I let ...
12
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5answers
26k views

RC differentiator circuit explaination

This is the circuit of a basic RC differentiator, with the input/output voltage waveforms. First of all, I don't understand why there is decrease in the output voltage (discharging of charge from ...
0
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3answers
4k 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 l1 ...
7
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2answers
623 views

Why do R and C have to be small for differentiator circuit

I'm a beginner studying The Art of Electronics, and on page 25 they introduce the differentiator. Basic circuit like so: They give the complete equation: $$ I = C \frac{d}{dt}(V_{in} - V) = {V\over ...
7
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6answers
2k views

What does the value of reactive power represent physically?

In my power engineering course, we were introduced to reactive power. I believe I understand what reactive power is in essence: there is energy transfer between the source and inductor/capacitor. This ...
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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 ...
6
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5answers
12k views

Circuit to remove noise from digital communication line

Carrying on further from my previous post and drilling down to specifics, I am trying to figure out the right way to implement "glitch remover", or "noise remover", using electronics (i.e. not in ...
4
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1answer
1k views

Resonance of Parallel RLC circuit

For the circuit above, I was wondering how they derived the formula $$\omega_0 = \sqrt{\dfrac{1}{LC} - \Big(\dfrac{R}{L}\Big)^2}$$ If anyone is able to walk me through this it would be fantastic.
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3answers
476 views

RL-C Circuit Problem

I am trying to get some practice on the basics, but i am having some issues with the following question: Find Currents I(1) and I(2) and show them on a phasor diagram. Find the total current, I(total)...
3
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3answers
8k 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 ...
2
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2answers
4k 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
596 views

simple network analysis doesn't give correct result

Well I tried to calculate the circuit below, because of little experience the calculation became terribly messy and I didn't solve it. I need to calculate the power given by the 3A current source. ...
1
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1answer
174 views

How to solve infinite grid with the observing terminals at diagonal of infinite square matrix?

The answer given is 2/3ohm solution is not given but I can expect how they got that answer but can't justify the way.
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2answers
814 views

Proof;Only Reciprocal Circuit are passive circuit

Consider a two-port reciprocal network : $$ \ Y= \left[ {\begin{array}{cc} 0 & -1/2 \\ -1/2 & 0 \\ \end{array} } \right] \ $$ then how can we proof that it is a passive network ...
3
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5answers
3k views

How to use input/output termination resistors in filters?

NOTICE: I have added another question here that a solution for each one may help for solving the other one. Please look at Fig-1 below. It is a common usage of termination resistors. R1 , R2 work ...
2
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2answers
592 views

Capacitors and filtering

I noticed that in many audio op-amps, RC constant is designed so that the cutoff frequency is about 16 Hz. I think that's because the human ear responses to frequencies higher than 22 Hz. But I am a ...
1
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1answer
94 views

A problem regarding connecting the grounds within two seperate circuits

Figure 1 I am trying to design the above circuit for my project to create zero crossing detector as shown in the above figure. This configuration was proposed originally by the member named "...
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2answers
930 views

Hybrid two port network models

Hybrid two port network modelling, as described by the texts, is a topic which enables one to reduce a complicated network into a simple two port network. I guess this is something which must have ...
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3answers
7k views

Finding Resonant Frequency in LC circuit using oscilloscope data

I designed a RLC circuit. I chose L and C such that resonant frequency become 2KHz. L=100mH, C=0.25*10^-6F and I took R to be 100 ohms. Then I generated Bode plot for range 100Hz to 10KHz. Ideally I ...
0
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2answers
434 views

Passive low-pass filtering question for a transducer output

I'm having ringing-noise from a pressure transducer analog output. Here is the only information about the instrument: http://www.trescal.be/pdf/PPC500_GB_SI.pdf Let me briefly explain the device and ...
0
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1answer
455 views

Resonance factor of RLC circuit

Say we have a RLC circuit, connected to a source. Say, regarding to the positive side of the source, we have in order, an inductor L, followed by a resistance R and a capacitor C in parallel. So we ...
0
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2answers
242 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 ...
0
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2answers
201 views

How is it possible that an LC Oscillator create a sine wave?

I have a question, for example look at this circuit: 1)How is it possible if this circuit can oscillate, for example taking on the capacitor full charged, and the inductor full discharged, the ...
0
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1answer
264 views

Finding state equations for an RL circuit with inductors in T configuration?

I'm working on an exercise which asks to "Identify state variables and write apropriate state equations" for the following circuit. simulate this circuit – Schematic created using CircuitLab ...
0
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2answers
662 views

Pure inductor as load in inverter

In the following inverter a pure inductive load is applied, then from where the starting current will start? (from 0 or -I(peak)). I want to draw the waveform of current through the inductor and find ...