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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1answer
55 views

What is the conductance of this LC tank?

So, I start with total conductance: $$ G_{TK} = \frac{1}{\frac{1}{j\omega C}+ 2R_C} + \frac{1}{j\omega L + R_L} $$ Then, when I take only the real part of this expression in order to know the ...
2
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3answers
117 views

RF transmitter circuit explanation

I just can't get my head around how these RF transmitters work: simulate this circuit – Schematic created using CircuitLab What I do know about them is the following, correct me if I am ...
4
votes
1answer
217 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.
0
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0answers
35 views

Two-port network: Image impedances

How can knowing the image impedance help matching the impedance of the source and the load? I know that in order to transfer as much power as possible, the source impedance should equal the complex ...
0
votes
1answer
25 views

How to find attenuation constant

Propagation constant is in the form P= a+jb (a= attenuation constant b = phase constant) a +jb = ln (x+ jy). How do I separate the real and imaginary part in the RHS so that I can equate the ...
0
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0answers
40 views

Twin T Network to equivalent T or Pi Network

How do I convert this Twin T network to Equivalent to T or Pi network? I tried using the star delta conversion but just get confused with nodes and loops.
1
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1answer
40 views

Tuned circuit value switching

I've been playing around with some LF RFID tags and want to create a EM powered sensor tag (ie, a normal passive tag). Ideally the tag should power up for a couple of mS, take a sensor reading (which ...
3
votes
2answers
334 views

How to design a 4th/6th/8th passive low pass filter?

I am trying to design a 4th/6th/8th passive low pass filter. The filter is used after a DAC to generate a fixed frequency sine wave. The DAC will export a square wave at 1kHz. So the pass band of the ...
1
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2answers
97 views

Why does my Inductor Get Warm? (Inverter Output Filter)

I have a H-Bridge based Inverter that modulates a 350VDC source into 220V RMS @ 50 Hz. Right now I'm working at just 70VDC but my output inductor is getting quite warm. Here is a schematic: The ...
2
votes
1answer
64 views

Thevenin equivalent and RC circuit

Here is the schematic: I got a little problem in electronics: it involves simple things but I can't figure it out (and found no other circuit that was the same configuration). At ...
3
votes
2answers
74 views

Finite parallel impedance network general solution

Does anyone know if a finite number of parallel-series impedance has a general solution? I am trying to model a network flow problem that can be described in electrical terms and represented as a ...
-1
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1answer
86 views

rlc circuit problem [closed]

I'm currently stuck on a homework problem. The question is as follows: A current generator is supplying a current \$i = 6\sqrt{2}\sin 4000t\$ mA, \$C\$ is adjusted until a minimum voltage, V, appears ...
0
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2answers
93 views

Kirchhoff’s law works in an RLC circuit with DC [closed]

Can somebody please explain how Kirchhoff’s law works in an RLC circuit with DC
0
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1answer
50 views

Is Kirchoff's Voltage law valid to derive current for LC circuits?

In this source it employs KVL: http://physics.info/circuits-rlc/ BUT in this source at page 6 it says "Apply Faraday’s Law in order to find I(t). (Can’t use KVL since magnetic flux is changing)": ...
0
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0answers
68 views

Problems with simple RLC Series circuit

I've just started learning about RLC circuits, and using a few different resources has confused me greatly. Here is the circuit in question: There are three seperate scenarios, one in which the ...
0
votes
1answer
51 views

exponential term in RLC sinusoidal analysis

I was learning to work with RLC circuits with sinusoidal excitations and the book I was dealing with showed me that the responses of these passive elements to sinusoidal excitation were themselves ...
1
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1answer
58 views

Impedance measurements of Nano-Materials using Hioki 3532-50 LCR HiTESTER [closed]

I have been using Hioki 3532-50 LCR HiTESTER (manual) to measure the impedance, Parallel capacitance and phase angel of nano-materials at different temperatures from ambient to 1150 °C. Lately I have ...
3
votes
1answer
149 views

How can I replace this inductor with a transmission line?

I'm new in transmission line theory, hope you can help me. I have this circuit: And I have the admittance; Yin=(1-j) x10^-3 [S] and its frequency f=100 [MHz]. What I need its first to find the ...
0
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0answers
55 views

Circuit that behaves as a long transmission line. Any ideas? [duplicate]

I am in need of a circuit that would replicate the behavior of a very long coax cable (miles long). Namely, I am interested in how it would distort a relatively low-frequency signal and how it would ...
0
votes
1answer
79 views

What's the function the network outside a crystal oscillator connected to an IC?

Take a look at this: Then general network is commonly seen when connecting an oscillator to an IC. What is the purpose of this network? Is there an article I can read on it?
2
votes
1answer
160 views

Norton Equivalent of Capacitively Coupled LRC Circuit

The diagram below is a schematic representation of a microwave lumped element notch filter. The goal is to analyse the parallel LRC circuit and derive an expression for \$S_{21}(\omega)\$, where port ...
1
vote
1answer
185 views

Using kirchhoff's voltage law with current sources

This is a follow up question of this question. Summarized: The question is solved there good, however I wish to solve the problem the using Kirchhoff laws. Kirchhoff's voltage/mesh law is nice as it ...
1
vote
1answer
41 views

What do I need to learn for solving these [closed]

simulate this circuit – Schematic created using CircuitLab The network 'N' contains only 2 elements. If the response for unit step excitation is i(t)= e^(-3t) A for t>=0. Determine ...
1
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2answers
71 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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2answers
97 views

Phasor Representation of Sinusoidal Forcing Functions

Lets take a phasor Vm<\$\theta\$ which is equivalent to Vmcos(\$\omega\$t + \$\theta\$) Let us Assume that a forcing function on a network is Vmcos(\$\omega\$t + \$\theta\$) +j Vmsin(\$\omega\$t ...
0
votes
1answer
220 views

Initial Conditions and current for an RLC circuit

It is required to find \$i_L\$ and \$v_c\$. It is quite easy to find \$v_c\$ from \$i_L\$ using simple integration. So, for now finding \$i_L\$ will be the concern of the question. Prior to closing ...
0
votes
1answer
118 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 ...
-2
votes
1answer
119 views

Calculating maximum power of a unknown resistor

I need to calculate for what value of Rpot, will I get the biggest value of power. This is the electric scheme: The values are: 𝑅1=1kΩ, 𝑅2=250Ω, 𝑈=5V. I have idea how to do it, but I don't know ...
2
votes
1answer
345 views

Oscillator for High Voltage Transformer: RLC or Blocking Oscillator

What type of oscillator is being used in the schematic? How is that particular oscillator working in this circuit? I'm less than confident with oscillator theory, and I can't tell if this is RLC or ...
2
votes
2answers
117 views

What are state space equations?

I'm in a Linear Circuits semester II class, and we're going over 2 port networks. State space equations show up on the practice exams but not the lecture slides or book. I was wondering if they were ...
2
votes
3answers
267 views

Steady State RLC Circuit With Dependent Current source

I'm trying to figure out the reason why in the following circuit, at steady state, the current ix is zero. My best guess is that because there is a parallel branch which by KCL should equal 100ix and ...
-1
votes
2answers
101 views

Calculating internal resistance of a voltage source? [closed]

I am trying to do some assignment for my homework. This is the assignment. The voltage at voltage source is calculated with measuring device that has has 2 resistance. The voltage measured is 10V. ...
1
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1answer
78 views

Trying to get v(t) for discharging RLC battery

I'm having trouble with the following problem. I want to find \$V(t)\$ (part (d)) and have been working for quite a long time on it. My first question is, if I do the following, are all the ...
3
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5answers
419 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
votes
1answer
121 views

Calculating voltage in RLC circuit

Well I think the prof has made a mistake in one of his exercises, though asking here to be sure, The question is to calculate the supply voltage in the system below. simulate this circuit ...
-1
votes
1answer
107 views

Getting the total impedance (and voltage from it)

Well considering below schematic, how can the voltage over the capicator be calculated? I've tried first to solve it by mesh analysis (replacing the supplied voltage + resistor by thevenin's ...
2
votes
4answers
104 views

Shape current through coil

Suppose I have a simple RL-circuit with known resistance R and, inductance L with a voltage source where I can apply any input voltage (via an arbitrary waveform generator). What I want now is a ...
0
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2answers
89 views

LC-Circuits and Feedback into power supply

I am a medical researcher and I found an effect that I think I understand half way, but not completely and I hope someone more skilled in electrical engineering can clear this up for me. I am a novice ...
1
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1answer
291 views

What is the physical meaning of an LC circuit having a negative transfer function?

Say you have an ideal LC circuit: simulate this circuit – Schematic created using CircuitLab The transfer function of this circuit is a complex voltage divider: $$ \frac{\frac{1}{sC}}{sL ...
1
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0answers
66 views

Working of a Choke Filter?

I was reading up on LC filters, and from what I understand, the inductor limits sudden changes in current, and capacitor allows AC to pass through, thus getting a somewhat constant output voltage. How ...
0
votes
1answer
141 views

Is it the frequency that determines the current in a LC Tank Parallel Circuit?

Jump a head to the question if you aren't interested in the background of my project Background of my project I want to create objects of metal. So I need to be able to cast a metal. Aluminium seems ...
2
votes
3answers
591 views

Electric car “J1772” charger - “pilot” signal sequencing with passive circuitry

J1772 Some background: Many electric cars are designed to use a "J1772" charging point. The main signal in the J1772 specification is called the pilot. Long story short, the car is expected to ...
5
votes
3answers
386 views

Why would I use a transformer instead of one inductor in a crystal set?

I'm reading up on A Simple Radio Receiver. I have a question about this image: The signal from the antenna (perhaps a few tens of microvolts, or hundreds for a nearby transmitting station) ...
2
votes
1answer
324 views

LC filter sizing 50Hz AC to good DC (RMS to DC)

I'm using a LTC1966 for a RMS to DC converter. My capacitor is a 10 µF. When measuring with an oscilloscope, I have a small ripple which I want to remove. My result from ADC to the program shows a ...
2
votes
1answer
115 views

How do I momentarily ground a 3.3V signal (with a pull-up resistor) when power is first applied?

I need to momentarily ground a 3.3V signal that has a pull-up resistor on it when power is first applied. This is feasible using a microcontroller or a push-button, but is there a "passive" way to ...
5
votes
3answers
394 views

What does the impedance look like around a small resonant loop?

Say I have a hoop of conductor, broken at the top, with a capacitor across the gap. The inductance of the hoop and the capacitance form a series resonant LC circuit: Now, say this loop is excited ...
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0answers
145 views

Coupled LC Resonator in MATLAB

I am designing a dual-mode resonator with the following Circuit Model and Frequency Response! ADS Circuit Model: Frequency Response: I need help with the modelling of my circuit model in ...
5
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3answers
324 views

Recommendation for ADC noise filtering?

I'm using an ADC (adc081c021) with a pretty noisy input: There is also a 5-second video here: http://tinypic.com/player.php?v=2ue47cm&s=5 The objective is to detect the two peaks. How could I ...
2
votes
2answers
349 views

Designing parallel RLC band-stop filter in series with load from f0, gain, Q parameters

I've been trying to design a band-stop filter for my headphones to cut back on excessive highs and to provide a more flat frequency response. With a software EQ and lots of tries, I managed to arrive ...
1
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1answer
205 views

Setting up Norton Equivalent of RLC circuit automatically?

I'm trying to gain a better understanding of how the internal SPICE solve works, and for the most part I understand the basics of DC analysis and transient analysis when it comes to RLC networks. The ...