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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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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41 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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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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199 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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51 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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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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47 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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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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340 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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1answer
145 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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228 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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1answer
156 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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1answer
72 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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906 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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145 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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251 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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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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161 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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1k 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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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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276 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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390 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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262 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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1answer
126 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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1answer
728 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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2answers
631 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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1answer
218 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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2answers
198 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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3answers
881 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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3k 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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1k 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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5answers
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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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496 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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1answer
712 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).
...
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841 views
Ferrite bead resonance
I have checked a reference design because I use the same microcontroller for my thesis.
The PLL power input is filtered by a ferrite bead and a capacitor. I have simulated the circuit and I found that ...
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1answer
141 views
Ferrite bead cases
I am migrating a design (RF) to a space grade/Hi rel design. My board has a lot of RFI or EMI filters. In my previous BOM they were of conventional dimensions (0603 and such). Now, I have to go for Hi ...
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3answers
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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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2answers
531 views
Regarding Ferrite Bead
What is a ferrite bead? How is it different from an inductor? How is it rated? What are its important parameters? What allows me to chose between an inductor or ferrite bead to filter out frequencies ...
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1answer
185 views
Function of Glass bead on EMI Filter Legs
I am looking at a PCB that has tiny glass beads on the input and output legs of an EMI filter. The middle pin goes to GND.
What is the purpose of the glass beads?
Couldn't get the focus quite right ...
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1answer
180 views
Power Isolation generating error in KiCAD
I've created a ferrite bead part with two passive pins. When I insert it in a power line, it causes an error "ErrType(3): Pin connected to some others pins but no pin to drive it" Changing the pins to ...
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162 views
What's the most effective way to prevent EM noise from coupling onto a cable and radiating out?
I've a PCB radiating noise inside a metal enclosure (this is Product 1 from this question here). Unfortunately, I can't change the PCB itself, so I'm having to tackle the problem by other means. I ...
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1answer
2k views
LC filter and ferrite bead
Suppose I've a circuit that is affected by EMI noises that have a freq. less than 80khz and noises above 2ghz. I want to cut off this noise freq. before they reach my ICs. The circuit is powered by 5 ...
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How to calculate EMI filter (ferrite bead) specs for digital signal?
I have a small project of mine that deals with plain old VGA output (d-sub).
In my project I'm using a CM2009 IC between actual VGA controller and VGA output connector. It's mentioned in the datasheet ...
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1answer
2k views
What is the component on the schematic indicated by the symbol of a diagonal rectangle with a line through it?
I can't for the life of me, figure out what these diagonal rectangles are...
Help?
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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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2answers
248 views
Ferrite Bead Current Rating
Could anyone let me know how can I calculate the current rating required for a ferrite bead on speaker path?
The speaker impedance is 32 ohms.
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1answer
2k views
What does 100Ohm @ 100MHz exactly mean in ferrite beads?
I am trying to understand the parameters of ferrite beads and having trouble in understanding the impedance vs frequency parameter.
What does 100Ohm at 100MHz exactly mean? Does it mean that the ...
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1answer
693 views
EMI suppression low frequency
I'm dealing with a PWM generator which drives a load at 12V with pretty high currents (5-10A)
The PWM frequency is in the band of 100-200 Hz. Which is the best choice and right configuration of ...
