# Tagged Questions

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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### Analysis of overdamped series RLC circuit (from “Foundations of Analog and Digital Circuits”)

I'm working my way through "Foundations of Analog and Digital Circuits (Agarwal)" and am, for the first time, stumped. Specifically, they analyze an over-damped, undriven series RLC circuit in ...
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### Finding the resonating frequency

Here in the given figure is a parallel circuit. The goal is to find the resonating frequency (fo).How can we find out the resonating frequency in that case? The formula in the given link won't work i ...
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### Is the output of this LC circuit a DC current?

On the left of the circuit shown below is a 120V AC current. I know that the diode (D1) rectifies the signal so that only the positive half of the AC signal goes through. I have seen circuits with ...
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### Confusion with cut-off frequency calculation using Thevenin equivalent of an RC low pass filter

When I was trying to see the effect of load at the output of an RC low-pass filer I found myself in some sort of confusion. Below is an RC low-pass filter circuit with another R as a load and its ...
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### Using a large resistor instead of a flyback diode

In a video lecture a professor is explaining how to prevent an electric arc caused by the switching operation in an RL circuit. Here is the section (at around 18:26) where he explains it: https://...
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### Admittance inverter realisation in filter design

I read some theory about lowpass prototype filters in the "Handbook of Filter Synthesis" by Zverev and in "Microwave Filters for Communication Systems". I read these two because I want to understand ...
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### LC Tank Tuner for Super Regenerative Radio

There seems to be very little literature to explain the practical construction of a radio and how a super regenerative circuit actually act as a selector, amplifier, how a antenna is actually to be ...
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### Understanding Resonant Frequency in a Series RLC Circuit

After spending a couple of hours on the internet searching for answers I'm hoping Stack Exchange can help me. Recently, using simulation software, I used an oscilloscope to calculate the resonant ...
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### Non-resonant RLC band-pass filter

To create a band-pass filter using an RLC-circuit, i drew the following circuit (assuming R is given as 120): The corresponding transfer function is  H(\mathrm{j}\,\omega)=\frac{120\, C\, \mathrm{...
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### Measuring Q and Bandwidth of an RLC series circuit using Oscilloscope

I have a HNC Lab assignment coming up. As part of the prep for the lab work we have been given an RLC series circuit for which we had to calculate some values such as volt drop , Wn, Q and Bs, which I'...
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### Second-order Band-Pass Filter Gain Confusion

If I derive the equation for a bandpass filter (in this case, critically damped) from the RLC transfer function, I get a different result than I would get otherwise by combining the transfer functions ...
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### What is the back voltage generated by this inductor in this practice problem?

The circuit is in a steady state, and the switch is lifted at t=0. In (a), i calculated the current i and the voltage v at the instantaneous moment that the switch is lifted. The current is 2A and the ...
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### time constant confusion of second order system

For first order systems, its easy to get the time constant by using thevenin concept. Suppose i have a second order system ,for example consider a two stage cascaded LOW PASS FILTER with identical ...
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### In which of the LCR circuit the charge will decay faster?

Our instructor gave this problem. Cc << C. At time t = 0, the capacitor C has charge Q. In which circuit the charge Q will decay faster. Its answer is Charge Q decays faster in (A). ...
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### What is the role of capacitor C3?

Here you can see the schematic of an LC oscillator. When I change the value of C3 it changes whether I have oscillations or not. For example if C3=10u there are not stable oscillations, and if C3=...