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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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 ...
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1answer
5k 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 a ...
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2answers
741 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 ...
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3answers
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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 ...
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2answers
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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. ...
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1answer
135 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 voltages ...
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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 ...
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1answer
655 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 – ...
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1answer
599 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 ...
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4answers
150 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 ...
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2answers
120 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 ...
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1answer
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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 + \...
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1answer
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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 ...
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3answers
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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 ...
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3answers
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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) is ...
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1answer
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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 ...
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1answer
225 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 ...
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3answers
1k 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 by ...
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3answers
2k 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 ...
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2answers
1k 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 ...
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1answer
512 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 ...
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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 ...
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2answers
2k views

Discharging RLC. Kirchhoff's second law

I have been trying to solve this homework problem for who-knows how many hours. I could break it down enough as to specify the problem I'm facing into a single question: For the following circuit ...
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1answer
1k views

How do I calculate parameters of LC filter from component values?

I have found this schematics and want to know corner frequency and characteristic impedance of this filter. How do I calculate it?
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1answer
9k views

How to calculate the resonance frequency of a parallel LC circuit with L having a DC resistance?

Here is the parallel LC circuit with inductor having also r: http://img842.imageshack.us/img842/4858/resonancelc.jpg http://img842.imageshack.us/img842/4858/resonancelc.jpg How can I calculate the ...
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1answer
229 views

Building radios using RLC Meter

I'm interested in building AM and FM radios from discrete components. Has anyone ever used an RLC meter to precisely create the inductors and other elements used in these radios? I know cheaper RLC ...
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2answers
237 views

LC circuit poor man theory

Ok, let's suppose we want to explain the resonant frequency of an LC circuit. By kirchoff laws is not so difficult ending to the equation: By using the Wolfram alpha engine I end up with the ...
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1answer
715 views

Circuit RL simumation explanation

I was playing around with a circuit, and I am not understanding its behaviour, it appears to be wrong. I am using this circuit. If you close the switch, the current will flow through the inductor, ...
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3answers
2k views

poles and zeroes

In network theory, there is a theorem which states that all the network functions in the s-domain can be expressed as the ratio of two polynomials A(s)/B(s). The poles are defined as roots of the ...
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3answers
13k views

Behavior of RLC circuit elements at t = 0

I'm wondering what are the behaviors of the inductor, L, and capacitor, C, at t = 0+ Please correct my understanding of the above circuit if I am wrong. At t = 0, the capacitor acts like a wire. So ...
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1answer
214 views

First Order RL Circuit

In figure 8.21 $$ R_1 = 50 , R_2 = 200 , L = 2 H$$ Voltage is given by $$ V_{in}(t) = V_{s1}u(-t) + V_{s2}u(t) $$ where $$V_{S1} = -10 V , V_{S2} = 20 V$$ a) Find $$ I_L(0^+) $$ and $$ I_L(t)$$ ...
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1answer
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how to calculate value of capacitor and inductor in a high power LC circuit?

I am a new learner of electronic. I am trying to modified a H-bridge motor driver circuit to control a thermoelectric cooler. Since I want to use PWM to control mosfets ON/OFF duration, in order to ...
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2answers
232 views

capacitive filter design

I have a question about output capacitor filters. So I know that a simple capacitor filter would have a single pole response, and this is just a first order filter. Let's say that the value of the ...
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2answers
631 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 ...
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1answer
140 views

R L CIRCUIT DESIGN [closed]

IN inductor current lag voltage by 90 if resistance and inductor is series .if laging current goes to resistor what happen .please explain about current from inductor to resistor
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2answers
939 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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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 ...
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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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1answer
2k views

Thevenin equivalent circuit with current and voltage source

I have the circuit below and I have to calculate complex current i1using thevenin equivalent circuit method: I tried to follow the rules and open the terminal <...
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2answers
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Change capacitance or resistance in RC circuit

When tuning an RC circuit you can choose either to tweak the resistance or the capacitance. I was wondering if there are any benefits for choosing one over the other depending on what you are trying ...
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4answers
3k views

Intuitive explanation for filters

Can anyone provide an intuitive explanation for the filtering action of RC or LC circuits? I know the mathematical treatment involving reactances but I was wondering if that could be explained ...
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2answers
596 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 ...
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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 ...
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3answers
503 views

Why does my transistor circuit produce a wave?

Could some one explain to me how my circuit works? I accidentally hooked this up while trying to work out an amplifier. I'm thinking there's something like RC resonance going on, but I'm not sure. ...
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1answer
2k views

Hall effect sensor output type - open collector vs RC

I am about to select a hall effect sensor. Two types are available: one has an open collector (OC) output, the other an RC output. The datasheet states that both are current sinking. But because I ...
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1answer
1k views

LC filter for Vref and Vadc

I'm reading an Atmel Data-sheet and it mentions using an LC filter for the Vref and Vadc pins, when simulating a simple small AC voltage with a 5V offset and using an LC filter with 10uH and 10uF the ...
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5answers
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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 ...
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4answers
8k views

Calculate the value of an inductor using an RL or LC circuit

Given an inductor of an unknown (though magnitude-estimatable) value, and a resistor of precisely known resistance, how can one calculate the inductance of the inductor? Tools I have at my disposal: ...
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1answer
699 views

Why use a resistor when blocking DC?

This may be a silly question, but I was wondering about the resistor involvement of a DC blocking network employed at frequencies 5MHz to 2400MHz. Most of the designs I have seen are an RC ...
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4answers
3k views

How do I make a real-world verison of this LC circuit?

I'm trying to build the LC oscillator show on the bottom of this page for some school project and I'm having a bit of problems translating the theoretical circuit into a real-world one. Here's the ...

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