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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180 views

Network theorem Source Transformation

When i am using Superposition Theorem i am getting 80W but when i using Source transformation getting 0W.Why getting different answers? Is there anything Hidden in source transformation that I need ...
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0answers
26 views

How does the change of load on the Rx side influence the Tx resonance voltage in a wireless powering sysytem

As the circuit shows, U = 5V toggling the polarity in 10KHz. When IL is changed from less than 1mA to 20mA, the P-P voltage of the Tx coil will increase. How should I understand the phenomenon? I have ...
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3answers
820 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 \$...
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1answer
79 views

question with rl circuit

I have an assignment in my electronics 1 class: http://prntscr.com/jcdz1m My idea was to find a Thevenin equivalent, convert it to Norton then i would get Io and calculate the graph for I1 and I2 for(...
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1answer
720 views

How Impedance triangle is formed? [closed]

I know how voltage triangle is formed for RL circuit. But I am not understanding how impedance triangle is formed. Is it derived from voltage triangle ? If so, how it is derived from voltage triangle ?...
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1answer
1k views

PoE 802.3af injector circuit

I am wondering if this little guy will work or if it will fry my router. Router is a UniFi AC Pro requiring 802.3af Gigabit PoE. I don't have one laying around so I came up with this. Its a voltage ...
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1answer
127 views

Deriving resonance frequency of RLCC circuit

I am trying to determine the resonance frequency of an RLC resonator with added capacitor, as shown below: simulate this circuit – Schematic created using CircuitLab Two cases are easy to ...
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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 ...
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0answers
191 views

Passive summing of two PWM signals

I want to sum/mix 2 PWM signals in order to reach a better resolution on a DAC (see here or here). I need help to understand the limitations of a simple resistors network to sum my two signals as ...
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2answers
561 views

Transfer function of phase change controlled with capacitance

We have an RLC series circuit with sinusoidal voltage source of frequency \$\omega\$. The normal transfer function of current to voltage is: $$ G(s) = \frac{I(s)}{V(s)} = \frac{1}{R+s L+ \frac{1}{s C}}...
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1answer
75 views

Impedance Matching With L-Network, Terminology Issues

Note: Using L Networks I am having some confusion with the terminology of impedance matching. Specifically majority of questions i have done state match a load to the source impedance which i ...
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2answers
315 views

How to construct a differential equation from this RLC circuit?

I'm trying to figure out how to construct a differential equation for the natural response of the following circuit and I am having trouble. The capacitor is initially charged with a voltage \$v_0\$ ...
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1answer
188 views

LC circuit with 2 capacitors, one charged, one uncharged

I have started to learn about LC circuits, in particular in the case where the initial conditions are where the capacitor has previously been charged. I am struggling to understand what would happen ...
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1answer
212 views

How to determine whether a system is in resonance with an externally applied voltage - RLC Circuit

Forgive me if this is the wrong forum. This is a problem in my Differential Equations class involving RLC circuits, but we have not gone over the concepts of these circuits in class. I'm given the ...
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0answers
686 views

LC band pass filter

I'm looking at implementing an LC bandpass filter, where I want upper and lower cut off frequencies to be 1254 Hz and 48 Hz respectively. Based on the pictures I've added - from http://www.radio-...
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1answer
73 views

Brief Startup Voltage in DC RL Circuit

I'm a recently-graduated electrical engineering student and I've been testing storage capacity of inductors and capacitors in simple DC circuits for circuit control. I wound up making the circuit ...
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1answer
72 views

Change of frequency in a capacitor when switch closes

I am studying an RLC circuit with a switch which initial position is \$a\$ as stated in the following image and with values \$R_g=5000\Omega\$, \$L_g=320H\$, \$C_1=31.66nF\$ and \$V_g=311\cdot\sin(100\...
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43 views

Relation between instant power and electric-magnetic power in a series RLC circuit

I know that the instant power of a circuit is given by the product of the voltage and the current of a circuit while the expression for the electric and magnetic energies is: $$ W(t)=W_e(t)+W_h(t)=\...
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1answer
87 views

High Current Inductor Switching

I am looking for some suggestions on how to handle switching between two, hi-power LC circuits that provide an AC drive source for dynamic loads. The LC target frequencies are ~1MHz for one ...
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0answers
190 views

Problem calculating resonant frequency [series RLC]

I try to link/prove the theory of resonance in practice. So for test I connected in series 1mH inductor, 1k Ohm resistor and 2.1 uF ceramic capacitor. Calculated resonant frequency -> \$ f_{r} = \...
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1answer
153 views

How to distinguish between a pure resistance R and circuit whose equivalent reactance is R (when in a black box)? [duplicate]

We were given the following question in our circuit theory class: Find the relation between \$R,L,C\$ such that the net reactance across terminals \$A\$ and \$B\$ is \$R\$. simulate this ...
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2answers
160 views

How to use phasor algebra to solve for capacitive reactance?

I have an RLC series circuit. Voltage supplied by volatage source as a function of time: \$V(t) = 230 \sin(\omega t+\pi/4)A\$. Current in circuit as a function of time: \$I(t)=10\sin(\omega t - \pi/...
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1answer
31 views

A question about enclosure material for a filter

Currently some transducer outputs through BNC connectors are directly coupled to a data acq. hardware's inputs. I want to install low-pass filters right before the data acq. inputs and for the ...
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2answers
2k views

Using low pass filter for a differential ended receiver system?

I want to use anti-aliasing filters in different scenarios. Below is the topology for how to use a passive LP filter in the case of a single ended transducer and single ended data acquisition: How ...
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1answer
43 views

Series RLC Circuit reduction possible?

This might be a dumb question, but with a circuit like this one: Are we allowed to add the resistances and capacitance in series to get a single resistor, capacitor, and inductor? Can elements in ...
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1answer
330 views

Solving a parallel RL circuit for the r and l values

I've a parallel RL circuit: simulate this circuit – Schematic created using CircuitLab And I know that (the RMS input-current) \$\overline{\text{I}}_{\space\text{in}}=2\$ A, (the RMS input-...
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1answer
68 views

Is this interface just a low pass filter?

I found the following BNC input output box for two channels(left side inputs, right side outputs): The grounds of the BNCs are connected via the metallic case. I checked this with multi-meter ...
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1answer
682 views

RLC circuit magnitude of the transfer function [closed]

I found a lecture MIT, about RLC circuit. I think there is an error in the formula 1.1. After all the transformations, I can not get the same formula... My decision path is the same as in this ...
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1answer
228 views

Very basic question about under damped oscillation frequency

Imagine a step response of a series RLC circuit oscillates as an under-damped way: I also came across the following equation: As far as I understand the ωd above is the frequency of the damping ...
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1answer
308 views

How to solve this RLC circuit for when the switch is closed?

In texts I see the example for RLC series circuits which is more straightforward, but how can I set the equations for the following circuit to find its response either in time or s domain and reach ...
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3answers
662 views

Hartley oscillator problem

For a couple of days, I have been trying to build Hartley oscillator on my breadboard based on this schematic: (Original source of schematic diagram above) Redrawn with components I chose: And here ...
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2answers
809 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 ...
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1answer
174 views

parallel RLC circuit / short out? [closed]

The problem said the resistor 300ohms is short out by the switch when t>0s why can this resistor be short out? useless condition or others condition?
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1answer
207 views

Is the flow of current in this RL circuit ambiguously defined?

TL,DR: Why does i_L in this point down instead of up? I get two different answers for the current i_2 when I imagine them in these different ways. Or am I (likely) making a mistake or missing some ...
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1answer
66 views

i want to know the cut off frequency on the 2 OPAMPS … Do I take 6K resistor and 5K resistor for OPAMP#2

I hope some one can check, I have a signal coming from a source and it goes in to 2 OPAMPS, and both has to be checked for cutoff frequencies... I know 1/2*pi*RC is the formula but my question is how ...
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3answers
299 views

why resonance is not considered in RC and RL Circuit

Why resonance is considered in RLC circuit and not in RC or RL Circuit
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2answers
1k views

Series RLC circuit problem

I have attached my attempt and the solution provided by my instructor. I am confused on 2 things what it means by "the circuit is in quiescent state" ? why is he getting sqrt(8) in the current ...
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1answer
73 views

Proving equivalence between circuits [closed]

On page E-3, example E.3 In the example the author has asked us to prove that the two circuits are equivalent. On searching I found that circuits are considered to be equivalent if they have the ...
2
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1answer
284 views

LC circuit with series diode (finding the linear average)

I've the following series LC circuit: Find the (linear) average of the current trough the diode. The ideal is a ideal component. The initial conditions in the circuit are equal to zero. MY ...
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2answers
106 views

how to calculate gain of this LCfilter

Here I plotted L-C filter circuit in spice software, at resonance frequency the output has maximum voltage 4volt whereas input is 6v, how to calculate gain or output voltage at any frequency? so far ...
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2answers
3k views

Voltage across capacitor/inductor in RLC circuit

It is said that voltage across capacitor/inductor is higher than the applied AC voltage. How?
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4answers
152 views

If we are finding the Thevinin equivalence of the following circuit, Are the inductor and the capacitor in series?

If we are finding the Thevinin equivalence of the following circuit, Are the inductor and the capacitor in series? I should be looking from the 36 OHM resistor right?
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1answer
38 views

Know Network Reciprocity From Scatting Matrix

Given the scattering matrix, \begin{array}{l}0.25&0.80-0.80j\\0.80+0.80j&0.30\end{array} Is this a reciprocal network? I know that for a two port matrix, it is reciprocal when S21=S12. In ...
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 ...
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1answer
155 views

How possible is producing very high voltage and electric arc by a using this simple setup

I have the basic series RLC circuit in simulation below. As one can see in SPICE simulation, the output voltage at resonance frequency goes upto 1KV: Can I really obtain that much voltage as in the ...
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1answer
360 views

Some questions about a magnetically coupled circuit

Below the RLC circuit on the left side by the help of a periodic impulse generator V1 generates periodic damped oscillations with a certain frequency, and the resulting oscillating current couples to ...
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1answer
248 views

Impulse response for parallel RLC circuit [closed]

How to find out the Impulse response for parallel RLC circuit?
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1answer
155 views

Can an opamp be used in a 75MHz narrow band pass filter?

My exposure to EE is more than half a century old (sorry). I want to investigate the near-field pattern of a variety of antenna configurations at 75MHz. I have purchased an AD8307 broadband detector ...
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3answers
148 views

RLC circuit, at what frequencies is the current 0.8A

So I want to know at what frequencies the current is 0.8A. I've calculated the resonance freq to =1006.6 Hz and the current is at that point 1A. So if I understand this correctly there will be 2 ...
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0answers
273 views

LC matching or pi filter used in rf

I am working in RF and if i go through articles it is seen that in every point where the RF signal flows it is said we need LC matching networks or Pi filters, but i cant get the sole reason why they ...

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