Questions tagged [passive-filter]

For questions about passive filters. Consider also using the "filter" tag, and use the "active-filter" tag if an active filter is part of the question.

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Seeking Guidance on Passive High Pass Filter Design [closed]

I'm seeking guidance on designing passive high pass filters. Can anyone recommend helpful materials or websites for understanding parameter sizing and design? I'm looking for clear explanations, ...
Ady's user avatar
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Questions about eliminating oscillation and noise in a load cell system

I'd like to ask you for your expertise on a challenge I'm facing as part of an electronics project. A crucial part of this project is the integration of a force sensor, whose variation in resistance (...
Clemfraiche's user avatar
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How do I run a frequency response analysis on a speaker cross-over circuit using Micro-Cap 12?

I've got a simple speaker cross-over network drawn in Micro-Cap 12, I'm using a resistor in series with an inductor to represent the speaker, I've got a sine source as a voltage source to the circuit. ...
Peggy Schafer's user avatar
1 vote
1 answer
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Voltage divider with filter cap gain derivation

I am a mechanical engineer by training and I'm self-studying circuits. I'm trying to understand how to derive the gain and cut-off frequency for the following circuit: I think that I should use the ...
nwsteg's user avatar
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Help demonstrating mathematically the behaviour of a passive filter

Consider the following circuit: By inspection, it can be said that the complex impedance of the circuit will be \$R_2\$ for very low frequencies and \$R_1\$ for very high ones, as the inductor will ...
Martel's user avatar
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2 answers
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Simple Guitar Tone Adjustments [closed]

What passive-type tone adjustments are available to install on an electric guitar?
Christopher The Penetrator's user avatar
8 votes
4 answers
2k views

DigiKey and others are incorrect about cutoff frequency for an LC filter

(At least I believe this is true.) If you Google "LC filter" and "cutoff frequency" you will probably see the formula 1/(2π sqrt(LC)). An example would be this online calculator at ...
Craft_Ohio's user avatar
1 vote
3 answers
88 views

Transistor specs in the capacitance multiplier

I'm working on a constant current power supply and as a first step designed the following rectifier with a filter. I know the bottom rectifier is inactive, but with couple of switches the circuit ...
beardeadclown's user avatar
2 votes
1 answer
108 views

SPICE (Spectre) "ideal" capacitive divider behavior

I decided to look at this after seeing this post, although I think they're not the same so making a separate question. I wanted to check what would happen in SPICE (this happens to be Spectre) if I ...
Halleff's user avatar
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Maximum inductor current ripple in an inverter circuit

The following is the maximum current ripple of the system in the figure below: In the system in the figure below, how is the maximum current ripple for L1 derived? I know that diL/dt = DVL/(Lfsw) ...
amidher's user avatar
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In Bode plots what does phase tell us for passive filters (open loop)?

I was just playing around with a passive filter to erase some noise - one that should work between 80MHz and 1GHz. I'm aware that the phase in Bode plots gives data about the time delay between the ...
user67441's user avatar
1 vote
2 answers
147 views

How do I go about calculating the phase of a complex transfer function at 10 kHz?

I need to calculate the phase of this two-port network at 10 kHz (see below). I found phasor by first finding Z_total by using the formula: Z_total(series) = Z_R + Z_C + Z_L to give: Z_total = -i/2pi ...
Jack Dwyer's user avatar
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Smoothing Capacitor value?

I am trying to incorporate a smoothing capacitor into a power supply for a model train set. The power supply puts out 18V pulsating DC with a max of 10 amps. The train set draws an average of 5amps ...
Muscle Nerd's user avatar
3 votes
2 answers
144 views

How to find transfer function for this pi-filter using FACTS Method with 6 reactive elements?

Am trying to apply the FACTS method to find out the transfer function for this circuit as shown below. This is a Pi-filter circuit with all its component parasitics and also including the source and ...
user15174's user avatar
1 vote
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Second Order Low Pass Filter, replacing inductor with VCCS and Capacitor

My instructor told us that we can replace an inductor in the following way. Now, I want to construct a second order low pass filter using Voltage Controlled Current Source, Capacitor, Resistor of ...
Manas Kesharwani's user avatar
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1 answer
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First order RC highpass filter input capacitance

I'm trying to find the capacitive load repreented by an RC first order highpass filter. Intuitively, I tend to believe the load will not be the C series capacitance, since the capacitor is not being ...
MPA95's user avatar
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Difference between tone control circuits in a simple op amp overdrive pedal

I am trying to understand the differences in operation and frequency response of the following tone control circuits. This question only applies to the sections circled in red. The rest of the ...
Dragonfruit1966's user avatar
1 vote
1 answer
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Differential Mode EMI Filter Design for DC Power Input Noises

https://www.murata.com/en-us/products/productdata/8796777775134/ENFH0008.pdf https://www.digikey.com/en/products/detail/murata-electronics/BNX022-01L/1825573 Hi everyone, I try to understand this ...
BlueWolf's user avatar
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1 answer
67 views

BLUENRG-LP BLE Antenna Design Query

I am developing a small Bluetooth Low Energy product using the BLUENRG-LP series of SoC from ST Microelectronics. For the RF matching part, I was told on their forum to just copy the design in their ...
CapEmb's user avatar
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1 answer
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Parallel RLC Simulation: 0° Phase and Maximum Amplitude Don't Occur at the Same Frequency in LTspice

Context According to LAB 3L.1.1 -- Response to a Sinusoid in Learning the Art of Electronics - a Hands-On Lab Guide (by Hayes, Thomas C. and Horowitz, Paul, Cambridge University Press, 2016) 3L.1 RC ...
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What is this following filter circuit called? (For amplifiers)

Noob here. I have a doubt on these passive low and high pass filters for amplifiers. If this is called high pass filter (which is doubled in series), then what is this filter circuit called? Here's ...
Warriorrev6300's user avatar
-1 votes
1 answer
123 views

Transient analysis of the low pass RC filter

I have designed a low pass RC filter and trying to simulate using transient analysis. I can't figure out the magnitude of the input and output waveform. What's the time delay between the input and ...
Davin Dempster's user avatar
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0 answers
55 views

How do I fix the output of my analog sound equalizer?

I'm new to electronics and I'm trying to build an analog sound equalizer with an TL071 as an amplifier. I have three different circuits for three different ranges (low frequencies, high frequencies ...
moriavia's user avatar
1 vote
0 answers
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Problem with analog passive lowpass filter

I designed a lC low pass filter and instead of getting a frequency response of lowpass, I got a strange frequency response as mentioned in the figure below. Does anyone have an idea ? The circuit: ...
Idan's user avatar
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Adding LC filter to PNP circuit

Let's say I want to add a L1C1 filter to power supply of PNP oscillator to avoid a current spikes drained from battery. In case of NPN circuits the designers usually place the L1 to Vcc rail. However, ...
Michal Podmanický's user avatar
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How we change equations in passive bandpass filters?

I tried it myself, but I couldn't understand how the equation ended up in the given form. After bringing it to that form, the cutoff frequency values can be determined, but since I couldn't do that, I'...
XcellentEEE's user avatar
-1 votes
2 answers
690 views

Why are active filters preferred over passive filters?

This question was asked to me in an interview. I replied that passive and active filters both have their merits and demerits : Unlike passive, active filters provide mechanism for gain adjustment ...
MAJID AHMAD's user avatar
1 vote
1 answer
109 views

What is the purpose of loading an analog input?

Theoretical question: I have seen in many analog signal circuits that the analog input pin is pulled down through a resistance. Sometimes it is also pulled up and sometimes there is a capacitor ...
RocknRoll's user avatar
0 votes
1 answer
61 views

Switched-mode power supply differential vs single-ended output filter

These two filters (borrowed from here) are mathematically equivalent. Passive output filters for class D amplifiers or phase-shifted full bridge converters are normally LC filters. I've seen both in ...
Marcos's user avatar
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3 answers
125 views

Can we find out RLC Circuit values from just cut-off frequencies?

For example, I've passive BPF series RLC circuit with the information of lower and upper cut-off frequencies. I need to find out the values of R, L and C. Is it possible? Thanks in advance.
Patrem's user avatar
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How can my crossover be improved? Efficiency is too low

I have been working on redoing the crossover for a pair of Dayton audio B652 Speakers, and have just been working on it through a breadboard for practice. I bought a bunch of cheap parts from bojack ...
Jake Slavin's user avatar
-1 votes
2 answers
154 views

Band pass filter not filtering?

I am putting together this band pass filter for a guitar project but it doesn't seem to be working. Here is the diagram and the breadboard I'm working with. There is a button there that isn't doing ...
Alexander's user avatar
1 vote
4 answers
387 views

How can I calculate the cut-off frequency of an RC filter?

I tred to calculate the cut-off frequency of the circuit below. When I think of two resistors as parallel and calculate them in a built-in RC filter calculator, I found a 51.0112 Hz cut-off frequency. ...
bcdyzi's user avatar
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1 vote
1 answer
76 views

RC frequency for PWM signal

I have recently read this project and would like to ask for some clarification regarding this statement/calculation: "The values shown work well an operating frequency of 1.95KHz or 13 bit ...
KaleM's user avatar
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1 vote
2 answers
611 views

Trouble calculating transfer function of 3rd order RC lowpass filter

I am working on simulations of a 3rd order RC filter. Cascaded first order RC lowpass X3 with: R = 100 ohms, C = 3.3 nF. When I perform the calculations for the transfer function I get a result that ...
gallauj's user avatar
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1 vote
1 answer
111 views

Overshoot of BJT circuit driving LEDs

It's a BJT circuit driving LEDs with a constant current and I adjust the brightness of it by sending PWM into the base of BJT. The problem is that I can see huge overshoot of LED current right after ...
Hello Hi's user avatar
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182 views

DC/DC converter pi filter for switching frequency filtering

I am using a DC/DC converter referenced as ECLB75W-24D12 for a product I am designing. The problem I have is that the switching frequency of 330 kHz is too important on the input and won't pass ...
Viosse's user avatar
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0 votes
1 answer
79 views

Fourth-order passive filter not behaving as intended

I have been designing a passive 4th-order RC low-pass filter in LTspice and was surprised to see that the slope is off substantially from what I would expect for a 4th-order passive filter. Instead of ...
Jake Slavin's user avatar
0 votes
2 answers
339 views

Second-order low-pass RC filter not working as expected

I am working on building a crossover filter for a set of speakers and I have started by designing a simple second-order RC low-pass filter on a breadboard. Assuming the circuit is wired correctly (I ...
Jake Slavin's user avatar
1 vote
1 answer
108 views

How to implement a passive RLC circuit from transfer function?

I'm designing a passive filter for a power electronic circuit. Theoretically I have obtained a transfer function of a passive filter that fits my requirement. But I don't know how to implement it ...
Adisu Teshale's user avatar
1 vote
1 answer
154 views

Transfer function of Lag-Lead Passive Filter

According to a book, transfer function of the lag-lead filter below is expressed as: $$\operatorname{F}(s)=\frac{s {T_2} +1}{s {T_1} \, \left( s {T_3} +1\right) }$$ there, $${T_1}={C_1} \left( {R_1}+{...
tomoya's user avatar
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1 answer
207 views

What kind of filters can be used for filtering high amplitude signals? [closed]

I want to build a filter that only allows signals with big enough amplitude to pass. Where should I start?
jjk's user avatar
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1 vote
1 answer
362 views

Resistor in Pi-filter [closed]

I have a basic question on the position of a resistor with respect to a pi-filter and hope you clarify my confusion. Consider these two circuits: simulate this circuit – Schematic created using ...
JH0894's user avatar
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3 votes
0 answers
122 views

Square vs Round Air-core Inductors for RF filters: When would you use one vs. the other?

The Kyocera AS-series Square Core Inductors boast that "the unique square cross section of the air core inductor provides better performance, and offers manufacturing advantages over toroidal ...
KJ7LNW's user avatar
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2 votes
2 answers
130 views

RC series for a switching regulator compensation pin

I am using the Viva VP2140 switching regulator in my project. How am I supposed to calculate the RC series into the COMP pin? I have in my project the circuit from the datasheet, first page.
rogeriomoraes_'s user avatar
4 votes
1 answer
497 views

Derivation of the transfer function of a 5th-order Butterworth LC bandpass filter

I am trying to derive the transfer function of a 5th-order Butterworth LC bandpass filter as seen in the first image. Rs is the source impedance of a signal generator and RL is where a load will be ...
Hendri's user avatar
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1 vote
1 answer
141 views

Filtering peaks of a H-bridge driving an electromagnet?

I'm driving an electromagnet (56.5Ω, 59mH) with an H-bridge composed by N-Type MOSFETs (SiHFR120) and half-bridge drivers (2EDL05I06PF). VDD is 80V. Everything works fine excepting the huge current ...
wellknow's user avatar
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0 answers
73 views

Selecting the suitable ADC data rate and LPF for a DC measurement

I want read the voltage from an electrochemical battery and send it to my PLC in order to do some automation (average value is around 1.2V, and I need an accuracy better than 100 microvolt). I am ...
bardulia's user avatar
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12 votes
6 answers
3k views

Ripple voltage filtering capacitor

I'm an self-taught high schooler who's trying to understand how filtering capacitors work. I've searched and read multiple websites trying to understand how filtering works. At the point where I am, I'...
Luke__'s user avatar
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3 votes
2 answers
583 views

Simulation results with LTSpice Label Nets

I am fairly new to simulations with LTSpice. I am trying to validate filter design that I have made, but I am quite confused to the results that I am getting with LTspice. It seems like when I put a ...
Dimitar Zhekov's user avatar

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