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Questions tagged [ferrite-bead]

A ferrite bead is a passive electric component, which is commonly used for suppressing high frequency noise in electronic circuits.

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Strange capacitor in Murata BNX filter

I've torn apart an EMI filter from Murata (BNX022-01). Does anyone have any idea what type of capacitor is this? Judging from a datasheet (https://www.murata.com/en-us/api/pdfdownloadapi?cate=&...
dude_ran4er's user avatar
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2 answers
69 views

Ensuring Proper Damping and Protection at Power Connector Inlet

I am designing a power input stage for a system (which consumes up to 90W) and want to ensure it is properly damped and protected. Here are the components and considerations I have incorporated so far:...
Firas Abd El Gani's user avatar
2 votes
3 answers
368 views

Correct Placement of Series Ferrite Beads to Avoid DC Disconnect During Power Cycling

I am working on a design where I am encountering a strange issue with the use of series ferrite beads. In some of my designs, I have successfully used series ferrite beads on the positive power input ...
Firas Abd El Gani's user avatar
2 votes
1 answer
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Ferrite bead on input EMI filter

Here is the schematic of a demoboard : It is a buck converter with an input EMI filter. As you can see it there is an inductor and a lot of capacitors which make an LC filter with a cutting frequency ...
Jess's user avatar
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Can ferrite beads turn high frequency noise into heat?

I understand that ferrite beads provide high impedance for high frequency signals. However, I am very confused on what that actually means. I've been reading in multiple posts and articles that ...
Gabriel Corrales's user avatar
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Ferrite bead on a SMPS output [closed]

Suppose I have an instrument which needs a very clean power supply line. I have an SMPS which outputs 24 V at 3.2 A, which is then cleaned via a LM1084 linear regulator. Given that the output of a ...
lemon's user avatar
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Ferrite placement with TVS and capacitors

I have to connect some capacitors (1 nF) and TVS diodes after inserting some ferrites as in the figure below. I wonder if it might be the same to connect the capacitors and TVS before the ferrites, ...
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Confused about Sharp Memory Display's analog power and ferrite beads

I have no background in electronics. I'm trying to understand Sharp Memory Display. I read the device specification to the best of my limited abilities, but still confused about a few things. Why ...
metazoan94's user avatar
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Ferrite bead parameters clarifications required

I was going through this document to learn more about ferrite beads. Regarding DC bias in page no 6 you can see the statement given below. "Notice that when 300 mA DC bias is used, the impedance ...
Confused's user avatar
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Is Noise filter needed for CAN passthrough?

The structure is simply diagrammed as follow. My Board provides only routing connecting each connector for other ECUs using CAN channel. My queistion is if i need additional CMCs on the routing. Are ...
min_c's user avatar
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Ferrite on digital signal

I have a SPI bus between two PCBs. From the master, the traces travel for about 3 inches on one PCB to the connector, 3 inches from the connector on the first PCB to the connector on the second PCB, ...
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Control noise in circuit to avoid disturbance in flow sensor reading

I am controlling water pump and electro magnetic flow sensor ( YF-S201 ) by esp32. Flow meter affect while pump running. I disconnected flow sensor in my circuit for testing. While pump start to ...
Hari .S's user avatar
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Conversion of radio emissions to decibels and role of impedance ratio to power ratio

This question is about a web article about radio noise suppression by Ferrite beads. The above diagram plots of a family of four curves for the ferrite bead. Each curve depicts the relation of ...
Jacob Miller's user avatar
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254 views

Can I put ferrite cores around the romex in my electrical boxes and breaker panel? [closed]

I've recently replaced most of the breakers in my house with dual-function arc fault/ground fault protection. (I spent five years in forensics, I'm deeply paranoid, don't judge me.) Naturally I'm ...
Stephen Collings's user avatar
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Radiated Emissions problem

This is regarding some Radiated Emissions testing unintentional radiator. We did a pre-scan of our product and we got the following EMI signature. Critical frequency is at 314.986 MHz Polarization is ...
DRF's user avatar
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Do you put a ferrite bead on both the positive voltage and GND trace?

I'm designing some basic DC power filtering for a very simple PCB. Do ferrite beads go on BOTH the positive voltage trace AND the GND trace, or should GND be completely free?
Rydberg's user avatar
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Ferrite Topology For Motor PWM

Brushed motors are pretty noisy devices, especially when driven with PWM. There are a number of techniques to reduce the transmitted noise (twisting wires, shielding etc) - one of these is using a ...
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Ferrite Bead for Ublox M10S GPS unit

I am trying to understand what ferrite bead to use for the Ublox M10S GPS unit. I am using as a reference the design from SparkFun GNSS Receiver Breakout - MAX-M10S (Qwiic) (https://www.sparkfun.com/...
Enk73a's user avatar
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1 vote
2 answers
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Can an EMI filter ferrite cores on data cables or ferrite beads be used as forward transformer?

Is there some difference in magnetic properties between ferrite cores of EMI filters on data cables/ ferrite beads and forward transformer cores? Can EMI filters cores/ ferrite beads be used as ...
Michal Podmanický's user avatar
2 votes
2 answers
108 views

PDN with ferrite bead

One objective in PCB design is to keep PDN impedance lower than a certain value upto a frequency range, to ensure power integrity. I believe that maintaining power integrity means that PDN is able to ...
gyuunyuu's user avatar
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How to choose power rating of a damping resistor for an LC filter? [closed]

I am trying to put power filter for an SMD oscillator (https://www.renesas.com/us/en/document/apn/863-power-filter-recommendations-smd-oscillators). One concern is the LC resonance. There are ...
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Why don't we call ferrite bead and choke as just an inductor?

Ferrite bead and choke have inductance which means they have high reactance for higher frequencies and dissipate their power as heat. Why do we use different term like ferrite bead and choke and now ...
quantum231's user avatar
1 vote
3 answers
450 views

Do I need to put a ferrite bead near a RS485 receiver device power pin?

I'm using a MAX3094ECSE+ RS-422/485 receiver receiver datasheet for an application that is receiving quadrature encoder wires. Those wires are power, positive and negative signals from quadrature ...
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The ferrite bead at where the supply pin of crystal oscillator is

I have a question about ferrite beads. The DC resistance of the ferrite bead is an important parameter for picking up our design. This value has to be as low as it can because if the current drawn ...
bcdyzi's user avatar
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4 votes
1 answer
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Ferrite bead or inductor

I'm using this device VSC8514 and this is its checklist. I just want to know what spec of ferrite bead I should use for this device's power rails. They have neither mentioned this in the checklist nor ...
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Ferrite bead in series with buck inductor

Background When filtering DM noise from SMPS, I have often used LC filters in the past. One thing that happens with regular inductors though, is that very high frequency (>100 MHz) switch noise ...
tobalt's user avatar
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6 votes
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Cable wrapped around a ring in electronic device: how to remove it?

On an electronic typewriter, a display cable wraps around a ring. What is it for and is there a way to remove (break) that ring in order to extend the cable length?
JeanB's user avatar
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Value of ferrite bead while connection chassis ground (from RJ-45 connector) to digital ground

I am connecting the chassis ground of the RJ-45 connector to the board's digital ground. In that case, I saw an Evaluation board design that uses a 1000pF 2kV cap to connect both the grounds. My ...
user avatar
2 votes
2 answers
284 views

PWM driven 24 V fan noise issue

I have a weird issue with a 24 V blower fan. We are driving it with an N-channel MOSFET at a PWM freq of 12 kHz. It has a periodic artifact that appears about 230 Hz or so. Observable behavior ...
PhippsTech's user avatar
2 votes
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Phil's lab understanding how to choose a ferrite bead

I'm trying to understand what ferrite bead he chose as shown in the picture. It says it is a 120R ferrite bead but from what I understand, when looking for a ferrite bead, you have to know the ...
elec's user avatar
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1 answer
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Confused about which impedence value to pick for ferrite bead

Per the vendor's recommendation, I need to add a ferrite bead to the 2.5 V power supply. An evaluation board used the BLM31PG601SN1. It has an impedance of 600 Ω at 100 MHz and a rated current of 1500 ...
Matty's user avatar
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9 votes
5 answers
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Ferrite bead selection

In some pages online, it is mentioned that "whenever possible, the targeted noise frequencies should fall within the bead’s “resistive band,” meaning the range of frequencies in which the ...
Shannon's user avatar
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5 votes
2 answers
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Why use a ferrite bead at a USB input

I came across this PCB schematic and I see they use a ferrite bead at the input of the USB 5V power. Full article is here My questions are: Why would you use a ferrite like this? How would I ...
JoeyB's user avatar
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3 votes
1 answer
340 views

Help identify schematic symbol

Is it a ferrite bead or coil of some sort? Or is it a gas discharge tube? Usually though it has a different symbol. If it is a ferrite bead then what is the point of those chassis connectors? Could ...
tarmogr's user avatar
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1 vote
1 answer
411 views

Picking TVS and ferrite beads for MCP9600 thermocouple converter

I'm about to use the MCP9600 thermocouple voltage to I2C converter for the first time. Because I need my output to be as precise as possible, I decided to apply the recommended circuit shown in figure ...
drydre's user avatar
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0 answers
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Connecting Split Power planes for mixed signal PCB

I'm working on a mixed signal board, and I currently have 3 power planes, 12V, 3.3V analog, and 3.3V digital. I have a single GND plane with good separation between the analog and digital components. ...
Mostafa Ibrahim's user avatar
6 votes
2 answers
4k views

How to get the parameters of a ferrite bead

I have been simulating a ferrite bead on LTSPice, however, I so far have been using the LTSpice database to select the Ferrite bead, I now want to use a ferrite that is not on the database. However, ...
JoeyB's user avatar
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4 votes
2 answers
1k views

Ferrite bead selection and simulations for a 2.4 GHz ESP32 3V3 power line

I want to be able to filter the 3V3 power line going out of the ESP32 MCU. Since this "may" have a frequency around 2.4GHz (Wifi or Bluetooth antenna). This may then affect other components ...
JoeyB's user avatar
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1 vote
0 answers
138 views

Flashlight dismantle: why is a small cylinder of ferrite used?

After dismanteling a Petzl flashlight, I found a small cylinder of ferrite. Why is it used? For what? The flashlight used 3 AAA batteries so the ferrite bead doesn't seem to be used for reducing high-...
MagTun's user avatar
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4 votes
1 answer
3k views

Inductor vs. ferrite bead

What is the distinction between a ferrite bead (as an SMT component) and an inductor?
OJFord's user avatar
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1 vote
1 answer
208 views

Burned component on GIGABYTE RTX 2080 GAMING OC 8G

I have purchased an RTX 2080 which contains a scorched component. I have carefully removed it with a heat station. The card is not short and it works, but it is seen with artifacts. As I found on the ...
Expoespa's user avatar
3 votes
1 answer
415 views

How lossy is a ferrite bead in its "capacitive" regime?

When using ferrite beads in spice, I often have the impression that they are not lossy enough compared to the real thing. In particular, the conventional model of RLC all in parallel is basically a ...
tobalt's user avatar
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1 vote
2 answers
489 views

Value of Ferrite Bead

How do I deduce the value of the ferrite bead between pin 2 and 16 as shown in the schematic.
BlackHawk's user avatar
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1 answer
2k views

What happen when we parallel or series ferrite bead?

If I use ferrite with capacitor as pi network. What happen when I series or parallel the ferrite bead? Which one reject emi better? I known the ferrite bead is not inductance. It act like resistor at ...
M lab's user avatar
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0 votes
1 answer
40 views

How to calculate current value for DOUT and RIN pin in MAX3221E texas IC?

Hi Im going to use ferrite bead in the Dout and Rin pin in MAX3221E IC of Texas. How to determine current rating of the pins , thereby i can choose the current rating of ferrite bead??
Selva97's user avatar
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0 votes
4 answers
87 views

Amplifier buzz caused by new electric room heater, set to medium only!

My Marantz receiver has never had this problem before. I have installed a new replacement MVH heater with 3 output settings: low, med and high (just like original). Suddenly when this is on and set ...
Doug Kerr's user avatar
1 vote
1 answer
734 views

Problem with ferrite bead - reduces power supply voltage

I built my own board with a LAN8720 chip but I can't get it to work. I found out that the ferrite bead I used only outputs ~1.4V from 3.3V input, which is way too low. I used some guidelines and other ...
Daniel Do's user avatar
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4 votes
3 answers
1k views

Purpose of high resistance ferrite beads?

Sorry, if this is obvious or stupid, but what is the point of ferrite beads with more than \$Z\approx100\space\Omega\$ of impedance? I mainly see their application as serial filters in either power ...
tobalt's user avatar
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0 votes
0 answers
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Is the necessity of the ferrite core on a PS2 controller cable a function of the length of the cable?

I'm connecting a wired PS2 controller to an ESP32. The controllers come with 2 meter cables that have ferrite cores at their connector end. I will be shortening to 5cm and soldering to a 5cm ribbon ...
Mikeologist's user avatar
1 vote
0 answers
420 views

SMD ferrite beads to supress noise when driving mosfets

I design a simple circuit activates fan when processor heats up. I started reading more, and I found a very interesting element a ferrite bead in smd form. It has 0.3ohm resistance, Imax 150mA and ...
Qmails's user avatar
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