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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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
38 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)\$) ...
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45 views

Maximum Power Transfer From Circuit A to Circuit B [closed]

Assuming both the voltage sources are in phase, the value of R for which maximum power is transferred from circuit A to circuit B is
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3answers
42 views

Quasi-elliptical vs pseudo-elliptical filters vs Chebyshev Type 2 filters

Are quasi-elliptical or pseudo-elliptical and Chebyshev Type 2 filters the same filter response? Quasi-elliptical or pseudo-elliptical filters appear to be defined as "... filters with finite ...
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3answers
104 views

Passive filter design, transfer functions and loading

I have been playing around with some basic passive filters (first order), really just to try and get a better understanding of the equations and transfer functions. I was talking to someone about ...
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1answer
98 views

Passive audio phase shifter (180°) - can it be done? [closed]

I understand that most analog hardware phase shifting circuits seem to use OpAmps to get their job done. I am trying to build a tiny, non-powered in-line adapter for Mp3-players and such to quickly ...
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1answer
53 views

USB switching power supply filter

Good afternoon fellow students of life, I have a particular question that relates to the use of a Duracell USB switching power supply as the main supply for a high sensitivity sensor board. Most of ...
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1answer
29 views

Combined RLC circuit phasor diagram?

We have a circuit in the picture below. What will the phasor diagram look like in case: $$I_C<I_L$$ and $$I_C>>I_L$$ ?
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1answer
28 views

A LC parellel tank problem

Image a simple RLC circuit as below: The source Vs can supply an AC current 40A max., if L1 is absent, the current flows through C1 can achieve 40A. And with the adjustable inductor L1, I wonder if ...
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1answer
60 views

What should be the source impedance and load impedance in LC filter design?

My aim is to generate analog signals with class-D amplifier. For that I am using the following configuration: Class-D-->Low-pass filter(LC)-->load(complex, real+imaginary) class-D amplifies my PWM ...
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2answers
42 views

Phasor diagrams for RLC series circuit?

So, here's the circuit: How can I make phasor diagrams for the circuit in case when $$I_C<I_L$$ and $$I_C>I_L$$ Edit: What made me confused is the current conditions, it's actually voltage ...
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2answers
79 views

do magnetic fields affects wifi signals? [duplicate]

I have note 4 and I have putted magnetic cover on it, and now sometimes if signals are low then if I put cover off then I can use my wifi connection and if I keep cover on it then it stops working. ...
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2answers
145 views

How does the RC time constant affect behavior of a passive integrator/differentiator?

I'm reading the first chapter of the AoE. I've come across this section on differentiator/integrator circuits and couldn't understand the math behind it. For the first picture, it says small RC ...
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1answer
43 views

Dual passive low-pass filter

I am building a class D amplifier and need to design passive low-pass filters for H-bridge with cut off frequencies at about 400 Hz. However, I am unsure about few things, this is the simplified ...
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2answers
65 views

Confused with network analysis

Can someone please explain me their workflow in solving the following transferfunction. I have to find the output-voltage Vo over RL, for an input-voltage of Vi. I'm not used to network analysis, and ...
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1answer
30 views

How much sensitive to thermal cycling are passive components?

One of my boards, which contain solely passive components, may be subject to high thermal cycling (up to +/-100°C, but tradeoff down to +/-30°C is possible). What sort of degradations can they ...
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1answer
59 views

instantaneous travel

Problem 9.7 of Basic Engineering Circuit Analysis asks one to "Find the instantaneous travel supplied by the source [...]" The word "travel" does not appear anywhere else in chapter 9. I suspect it ...
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1answer
52 views

Help solving a 2nd-order RLC circuit

This is the practice problem 8.9 of Fundamentals of Electric Circuits 5th Edition. Can someone help me with this question? I need a more detailed solution of this problem. Especially, what are the ...
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1answer
177 views

Damped RLC Circuit Equation

I'm trying to measure the inductance of a toroid with the use of a 555 in astable mode. Hopefully, by putting the toroid in parallel with a known capacitor and driving the circuit with a low duty ...
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1answer
82 views

Transfer function of damped RLC cricuit

I am currently in my final year of University and am completing my final year project. I have a circuit that I am analyzing as part of it and could really use some help. I am trying to determine the ...
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2answers
59 views

Will an impedance matching network also act as a filter?

Will a matching impedance network also act as a filter? I'm using a pi network and am wondering if I should also add a filter. I designed the pi network by using the program SimSmith and it consists ...
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2answers
63 views

Algebraic Notation for Circuits

When dealing with a circuit diagram of some type, a fairly typical procedure for simplifying the circuit is to redraw the circuit diagram a number of times, each time performing one or more ...
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0answers
69 views

Best way to add capacitance to LC circuit?

I'm trying to simplify the way I ask things around here. How would I make the switches digital and controllable with an Arduino? The circuit is running at 170VAC @ 150kHz.
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1answer
63 views

Switching 150kHz mains for an LC load

I'd like some input on whether or not to use a mechanical relay or some form of SCR setup to change the capacitance in my LC circuit that is currently operating at around 170V, 1A at 150kHz. (Not ...
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1answer
35 views

Calculate Gain of Modified Band-Pass Filter

I would like to calculate the gain of this simple band-pass filter. simulate this circuit – Schematic created using CircuitLab What I'm interested in knowing is, in order to find this ...
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2answers
230 views

RLC - Understanding Phase Shifts

I'm having trouble understanding intuitively phase shift for RLC circuits. For example, I have seen the following: In the low-frequency regime, which element is the dominating element (highest ...
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4answers
83 views

Passive network with more than Unity gain

Can a passive network have a transfer function of more than Unity gain for some frequencies? Can you give an example? Thanks.
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3answers
918 views

Why is series LC circuit not behaving as band pass filter?

I am trying to simulate LC circuit using external source that generates square wave of 503Hz of amplitude 2V as below: Natural frequency of circuit above is 503Hz.So it must pass this much ...
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58 views

Thinking causally about linear circuits

I am taking a course on LTI systems. I understand phasor analysis, complex impedances, and I can apply the methods mathematically. What I don't have is an intuitive understanding that I hear in ...
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3answers
493 views

Differentiator circuit - can output be larger than input?

I have a question regarding differentiator circuits, and whether or not their output voltage can be greater than their input voltage. The voltage across the resistor in such a circuit corresponds to ...
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2answers
77 views

Band-stop filter components question

I would like to build a passive band-stop filter for my earphones. I recently had some help from the user "Andy aka" with designing that type of filter and he also pointed me to the LTSpice ...
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1answer
93 views

RLC band-stop filter help needed

I'm trying to create a passive RLC band-stop filter for my Sony EX71SL earphones, which has a nasty little spike in one treble frequency area. I found a similar such filter on the likwitz website: ...
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2answers
220 views

LC Oscillator, Tank Circuit

How does a tank circuit work with a dc power supply? I understand that if you charge a capacitor that's in parallel with an inductor and then remove the power supply then the capacitor and inductor ...
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4answers
1k views

How to easily calculate transfer function of an LC filter

Consider a simple LC network: simulate this circuit – Schematic created using CircuitLab Is there an easy way to compute its transfer function in the Laplace domain? I would consider as ...
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1answer
88 views

Multi Stage Passive Filter Design [closed]

I'm playing around with some simple RF beacons, many of these use a multi stage LC ladder to filter the outgoing signal after passing through a class C amp. Can anyone point me to a good ...
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3answers
283 views

LC lowpass filter optimization

I have some 12 volt cooling fans which interfere with a radio transmitter. I notice that if I either put a large capacitor in parallel, or a large inductor in series, I can eliminate the noise heard ...
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0answers
65 views

Why is it impossible to realize elliptic even-order filters with \$R_S = R_L \$?

Referring to RLC continuous-time prototypes of filters, I have read that an elliptic filter of even order can not have equal source and load termination resistances. The trasfer function for such ...
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2answers
126 views

RLC Circuit using Laplace transform

Please help-me in this question, first I calculate the I(s) and I get $$ I(s) = \dfrac{ \dfrac{1}{s+1} }{ s^2+\frac{R}{L}s+\frac{1}{LC} } $$ How I proceed to find Vo(t)?
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2answers
274 views

Examples of one port network

Can anyone give me some examples of one port network, explaining its significance? Actually I just want to know whether or not such one port network exists? If they do,what are they used for.
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50 views

Soft switching of KY converter

My project topic is soft switching of KY converter. A KY converter is similar to a buck converter with synchronous rectification. I want to apply soft switching to this circuit. How can we apply soft ...
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0answers
83 views

Home made passive tablet pen

I have an old wacom tablet at home, its really big and I'd like to use it but I've lost the pen for it. It uses pens with passive LC circuitry. The board creats an EM-field (I can see it on my ...
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95 views

In the under-damped RLC Circuit, one constant is imaginary, but there can't be imaginary current

I'm just learning about RLC circuits and all the math makes sense, but one thing has been bothering me. In the derivation of the equation for a underdamped, series RLC, the roots to the ...
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1answer
121 views

Finiding composition of circuit from frequency response and bode plot

I have the following bode plot and nyquist plot result of an unknown DUT (it is a filter I asume!). I wonder what kind of arrangement it has in terms of being a series or parallel RC or RLC ...
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3answers
198 views

RC filter transfer function and gain

For a standard basic RC Filter, the transfer function is as follows: $$ { V_{out} \over V_{in} } = H(j\omega) = { 1 \over 1 + j\omega RC } $$ However, when simulating the circuit, I find the output ...
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1answer
342 views

Comparison of Series and Parallel LC Filters for Noise Reduction

Since there are two basic types of LC circuits that can be used for passing/blocking signals, I'd like to know the differences when using series or parallel LC circuits for noise at a known frequency. ...
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1answer
132 views

Natural Response of Parallel RLC Circuit

In the circuit shown below, I need to calculate the current through the capacitor, which is initially charged. I'm thinking I have to calculate the natural response of the circuit, but am unsure of ...
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2answers
119 views

Series RLC measurement result different with theory

I am measuring the current and voltage in simple RLC circuit: However,the result that I measured show big difference with the simulation result using Multisim. Why is there are a big difference ...
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2answers
143 views

Why does my bandpass filter act as highpass?

I have designed a bandpass filter. Here is the circuit and spectral characteristic: As you can see from the response curve, it has cutoff with the peak ranging from 260 kHz to 290 kHz. Here is ...
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3answers
2k views

RLC circuit - transfer function through differential equation - Band stop filter

Need to find the transfer function of this band rejection filter via its differential equation but cannot figure it out since it was some time ago I studied electrical circuits. I know that I ...
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2answers
50 views

When is this voltage source activated?

So I'm doing first order circuit analysis and I stumbled upon a circuit which had this as a voltage source: When would this voltage source be active? For example in this circuit: The current ...