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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113 views

Voltage Regulator for GPS vs. BMP280

I am using the Bosch BMP280 pressure sensor and the FGPMMOPA6H GPS chip together on a PCB. I am using the reference designs from Adafruit's breakout boards for each chip (found via the product links: ...
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267 views

Ferrite ring vs ferrite choke interchangeable?

I am assembling a Gimbal controller that needs "Ferrite rings". Can I use Ferrite clamps instead? Do they do the same thing? manual requirement: What I want to buy:
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What is the purpose of the ferrite bead on DC Adaptors?

According to WikiPedia: Ferrite bead suppress high frequency noise. In the case of wall power adaptors, are they trying to protect the device being powered or are they protecting the PSU from high ...
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39 views

Syfer (now Knowe) X2Y EMI filter

I struggled to compare the EMI filter needed for 24V to 5V non-isolated BUCK DC/DC (running 300KHz to 500KHz) to ensure it passes CE conformance. I wish to keep switching noise within the DC/DC area ...
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67 views

Bead on buck regulator circuit

I came across a DC-DC converter schematic and I notice that they use a bead on the schematic. I would like to know the purpose of this chip on this circuit and what the effect of removing it.
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99 views

importance of ferrite bead impedance?

Would it be safe to replace a ferrite bead that had a rating of 47 ohm @ 100MHz 5A with one that is 70 Ohms @ 100MHz 6A? I can't seem to find an exact replacement. https://www.amigawiki.org/dnl/...
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154 views

Inductor : how to choose toroidal ferrite core material

I want a 2.2mH toroid inductor working at 200kHz switching frequency able to keep 2A saturated current. I found a ferrite core provider with these possibilities : - Core FT50-61 (12.7x7.15x4.9) with ...
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143 views

Is there an easy way to find out if my 0805 SMD components are ferrite beads?

I ordered SMD 0805 components among other items and I received a package with the SMD components but there is no description at all. Also, there is no identification on the components itself. Is ...
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160 views

Should ferrite beads be closer to the stepper motor or to the motor driver?

Stepper motor, cable with ferrite bead, and dual H-bridge driver: I noticed that the cable that came with these motors had the bead closer to one end. Does it matter which way it's wired as far as ...
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84 views

“NM” Inductor or Bead label?

I do not know what "NM" indicates here under this inductor/ferrite bead label L5?
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445 views

Placement and values for ferrite bead/capacitor ESD protection / transient suppression filter

I've been researching but found it difficult to find a clear answer on this. I need to add ESD protection to my circuit, in this Texas Instruments video it talks about combining a TVS diode with a FBC ...
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49 views

Voltage regulator circuit

I am using this linear regulator and the application circuit looks like this: Is the above circuit good enough? I have a habit of putting a series ferrite bead on the input side but after reading a ...
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58 views

Ferrite beads for high currents

In the EVM datasheet schematic, two input beads and 2 output beads are used. In my application, I drive 56V 5A COB LED. Input voltage is 22-50V, so input current can be ~6-13A. I read on Internet, ...
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103 views

Ferrite beads with turns

I need to understand the meaning of this word "2 1/2 turn ferrite bead" ?? What exactly this 1/2 means ? Does this means that the wire is turned twice inside the bead?
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How to insulate DC from earth noise while keeping it referenced to it

I have an AC/DC converter (220 to 24) inside an electrical cabinet. The 0VDC is referenced to earth, like this (couldn't find a symbol for an AC/DC converter in the schematic editor so I made a dirty ...
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42 views

ferrite bead selection for GSM application

I am trying to get a better understanding of a good method for selecting ferrite beads from those available. I have a CLC filter, with 1uF x7r ceramics for each C, L being a ferrite bead in a 0805 ...
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687 views

Ferrite bead in Ground path of Input Power Supply

I have been following the schematics of Colibri Toradex Carrer Board. I have used most of the components from their design. However, they have used ferrite beads in Positive terminal and Ground ...
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211 views

Ferrite bead for high-speed digital IC

Although I've seen numerous recommendations for the use of FBs on the power supply rails of noise-sensitive analog circuitry, the opinions regarding their use with high-speed digital circuitry are ...
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113 views

A question about ferrite bead used for differential mode filter

At high frequencies sometimes ferrite beads are used instead of inductors as normal/differential mode filters. I draw Figure 1 and Figure 2 below showing LC and Ferrite bead C differential filters: ...
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940 views

Ferrite bead in cable or in device?

I am wondering, I made a MIDI circuit and was advised to use ferrite beads in my device for MIDI input/output. It is a similar to the following circuit (only the L1/L2 ferrite beads are important for ...
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North American standard symbol for ferrite bead?

Many of the schematics I've seen in reference schematics use an the symbol of an inductor as the symbol for a ferrite bead (makes sense). But I've also seen other variants of it as well. I don't have ...
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248 views

Suppressing “travelling” EMI spikes

I am working on a circuit with a AC to DC power supply module and wireless MCU module. The MCU operates at 240MHz and on the power input to the module there are 2 x 0.1uF capacitors and a 22uF ...
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242 views

Are bypass caps reason why uC don't have flyback diode across ferrite bead in the sample schematics?

Often the IC datasheet recommends putting a ferrite bead before AVCC pin. First I started wondering if I don't need a flyback diode but than I realized that capacitor is probably able to absorb the ...
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Ferrite instead of LDO

Currently we are using the following power supply scheme: This solution effectively separates the analog sub-part of the PCB from the noise of the digital sub-part. Now we are going to use the ...
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212 views

Do ferrite beads need snubbing diodes?

Inductors, when applied as inline power filters, need a parallel snubbing diode so that when the load opens, the current can be safely discharged. In certain contexts, ferrite beads such as the Laird ...
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82 views

How similar are ferrite beads with same dimensions, only differing in material?

For a particular application I'm making use of the TX22/14/6.4-3C81 ferrite bead. The purpose is to reduce noise of the DC supply voltage, with the supply wire wrapped around the ferrite toroid. These ...
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519 views

Characteristics of Ferrite cores

Why can't ferrite cores be used at lower frequencies like 50Hz? To my knowledge, they can only operate at high frequencies.
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2k views

How to check ferrite beads?

I faced with a problem of checking ferrite bead with parameters: The measurements for two reels of this component have difference in Resistance and inductance: Reel 1: Resistance: 170 mOhm, ...
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177 views

High current ferrite beads

I've found ferrite beads work great for eliminating high frequency noise on the input and output of DC-DC converters, but now I have a DC-DC converter that is outputting 20A and ferrite beads work at ...
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368 views

Adding a ferrite bead to source of mosfet (smps)

We are designing a SMPS (ultra low noise) based on TI schematics http://www.ti.com/lit/df/tidrgc2/tidrgc2.pdf (5V, 15W quasi resonant) In order to reduce EMI (we have some ringing across Mosfet when ...
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25k views

Does the position of the Ferrite bead matter?

Often I will see a ferrite bead a couple of inches from one end of a cable. Does the position of a ferrite bead really matter?
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341 views

Won't the ferrite bead (L3) will restrict sudden power requirement of bluetooth module (U4)

I know the circuit is well tested by STm but, I think, C15 should not be able to provide enough instantaneous power. Does noise suppress by this ferrite bead (cross-over frequency 12MHz) will be same ...
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64 views

How to determine approximate type of SMD Ferrite Chip

I am reverse-engineering a device so that I can develop my own, compatible device. There are a number of SMD Ferrite Chips (size 0603) inside. A quick look at Digikey shows that there are almost 600 ...
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238 views

What frequency is Ferrite Bead reactance usually given at?

I've noticed on schematics at work, when I was at uni, and on datasheets that Ferrite Beads usually (90% of the time) are only given with their designator (FB? or L?), then the reactance (XOhms) and ...
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2k views

Why do some computer power cables not have ferrite beads? What type is usually used?

Admittedly I'm clueless when it comes to electrical engineering. I felt compelled to add a ferrite bead/choke/clamp to my computer's power cord since it was missing one. Would it be helpful? What kind ...
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306 views

I need help to find this component

I found these at the entrance of an analog input, so I think these are ferrite beads with a metal ground case but I need the part number. I searched several component websites but I couldn't figure it ...
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477 views

Ferrite bead for mobile headset

I have a mobile headset setup which could be summed up like this: phone→30cm cable→aluminum box→ 100cm cable → headset The aluminum box is 50x50x20mm and contains one potentiometer and 2x 3.5mm ...
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138 views

Leaded Ferrite bead good choice for winding my own coils?

I have never designed directly with a ferrite bead: pic here http://media.digikey.com/photos/Steward%20Photos/28L0138-40R-10.jpg I want to wind my own inductor coils, and these seems useful for the ...
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Ferrite bead position

I wish to use some extra power supply filtering for my DAC, ADC, CPLD and OpAmp devices. In this question I got the point about the global locations for ferrite beads. If I understood correctly, the ...
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900 views

Choosing ferrite bead in Henry

How can I choose a ferrite bead if on schematics it's marked as 100uH? On Mouser all ferrites have only Impedance value. How can it be compared to inductance in Henry? JIC, in BOM it also commented ...
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912 views

Ferrite Bead: How much impedance do I need?

I understand that ferrite beads can be used to reduce noise from a power supply input to an IC. I understand that one selects ferrite beads based on its resistance at the noise frequency one wishes ...
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What's the purpose of a ferrite bead inductor on this circuit?

I'm studying the analog voltage reference circuit described in the AVR450 Application Note - Battery Charger for SLA, NiCd, NiMH and Li-Ion Batteries, which schematic is below (copied from page 38). ...
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Ferrite bead vs common mode choke

simulate this circuit – Schematic created using CircuitLab I inherited the top circuit from a previous designer on my robotics team. The circuit uses two ferrite beads, a zener, a TVS and a ...
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255 views

Propagation Delay due to Ferrite Bead [closed]

When I pass a 33MHz 'Square Wave' through 3 ferrite beads connected in series, 742792606 (from Wurth), I see that the output wave turns 'Sine' in form. Also there is a delay as it propagates through ...
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227 views

Best way to filter VCC to Radio Micro

My project has two micros. One is an ESP8266 - WiFi radio and the other a general purpose micro. The power to the ESP needs to be clean. I initially looked at a pi filter using a ferrite bead but ...
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1k views

Understanding Ferrite Chokes

I am looking to clean up the power supplied to a video transmitter on the UAV I am building. The video transmitter consumes about 200mA of current at 16V DC. The 16V line has noise from motors and ...
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1answer
4k views

How to select appropriate ferrite beads for power supply rails [duplicate]

I'm making a camera board using IMX225LQR image sensor. For this sensor you need 3.3V analog power supply and 1.8V, 1.2V digital power supplies. Also, the 1.8V power pins are close to the 3.3V analog ...
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2k views

When has to be used a ferrite bead in power supply?

I'm designing a PCB with a Telit GL865 GSM/GPRS module. I find this example in Internet and I am wondering why has it got a ferrite bead on 3.3V power supply line. Some extre values from datasheet: ...
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507 views

Ferrite Beads Design

Currently learning about ferrite beads. I have noticed that on the data sheets they have graphs of impeadance vs frequency. to ensure you have the best ferrite for the job I assume you want to get ...
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884 views

SMD ferrite beads - DC current rating

I don't quite understand the concept of the DC current Rating of the ferrite beads. Let's say we have a ferrite bead with 120Ohm @100MHz and with 3A rated current (and a DC resistance of 30mOhm). ...