# 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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### RLC Impedance Calculation

Sorry, will provide more information now. I am working through this question from an all about circuits webpage (See attached webpage link) and have having trouble seeing how they calculate an ...
56 views

### How is the sweep type affecting the Bode plots for the same AC analysis in LTspice?

When I do an AC analysis for the following circuit between 0.1Hz upto 20MHz, and by selecting "decade" in sweep types I obtain the following plots: But if I do exactly the same thing only this time I ...
54 views

### Source transformation violation

Using thevenins or norton theorem, we can easily find current through the resistor as 1 amps. But if we convert the current source to voltage source , current turns out to be zero amps . Why?
82 views

### Confused with electrostatic pickup and capacitive coupling terms

I can understand the meaning of capacitive coupling of the signal line to GND or Earth or nearby earthed objects. Below line section illustrates that: But there is also a term called “electrostatic ...
783 views

### Analysis of an LC circuit antenna

I want to analyse a parallel LC circuit in terms of inputs and outputs as I am studying them in the context of using them as a tuned antenna. However I am unsure of where to identify the inputs and ...
146 views

### Reset circuit loops forever on-off

I've designed the following circuit: This is a "self-reset" circuit, VCC_IN es 12V from source, VCC_OUT powers the entire board, including a PIC microcontroller. The idea behind this is whenever the ...
597 views

### RL circuit: How to determine the equivalent resistance of the circuit?

So I'm working on an RL circuit and the solution is stated to be that R1 and R3 are in series, but I didn't think that was the case because they don't have the same current through them. Given ...
537 views

### Differential Equation of a LC Low Pass Filter

I'm trying to learn about different applications of RLC circuits and have been presented with a weird looking circuit... I've only ever dealt with circuits that can be modeled with a 2nd-order ...
154 views

### finding small R in series RLC circuit

Hello! I have an device which is equivalent circuit is RC as follows in the image I shared: R is supposed to be 0.5Ω and C supposed to be 30nF, but it can vary a little bit between device to device. ...
465 views

### How to experimentally measure damping in RLC circuits?

I know there are methods to theoretically determine the damping factor and quality factor in RLC circuits. Equations such as $$\zeta = \frac{R_s}{2} \sqrt{\frac{C}{L}}$$ $$Q = \frac{1}{2\zeta}$$ ...
190 views

### Neglecting certain elements in deriving the current of a series RLC circuit

The current at resonance in a series RLC circuit is described in the bottom derivation, along with it being plugged into the formula for finding the voltage across the inductor in the circuitw: I ...
234 views

### RC-LC network equals lowpass filter of third order?

As far as I know only this are two lowpass filters (R-C1, L-C2) of order 1 and 2 respectively. Is it possible to denote this circuit as Low-pass filter of third order? Or is it possible to transform ...
161 views

### Eliminating the resistance variable in the total resistance/reactance equation of a series RLC circuit

Assuming that we have a simplified equation from a simple series RLC circuit where the total resistance/reactance in the series RLC circuit is equal to 100 times the resistance R: How do we modify ...
658 views

### Building a series RLC circuit using a given resonant frequency and bandwidth value

Assuming that we have to build a simple series RLC circuit in such a way that the its resonant frequency must be 200 krad/s and its bandwidth as 20 krad/s, we have these components: Resistor: 1000 ...
72 views

### How do I determine the unknowns for this equation?

Suppose a series RLC circuit in series with a 12 V battery and a switch initially opened. R = 100 Ω, L = 100mH and C = 10uF. L and C are initially discharged. A t=0 the switch is closed. I want to ...
277 views