Electrical Engineering Stack Exchange
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Questions tagged [ferrite]

Anything related to the properties and applications of ferrites. Ferrites are ferrimagnetic compounds widely used in the manufacturing of electrical devices exploiting magnetic fields like inductors and transformers.

Anything related to the properties and applications of ferrites.

Ferrites are non-conductive ferrimagnetic (not to be confounded with ferromagnetic) ceramic compounds widely used in the manufacturing of electrical devices exploiting magnetic fields.

For their desirable magnetic properties they are widely used for inductor or transformer cores manufacturing or magnet building.

See also Wikipedia on ferrite.

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Ferrite or iron powder? How do I tell what an unknown core is made of?

Most times when I need a small inductor, I try to find the necessary core in my junk box. Depending on what I'm trying to build (RF, power, ...), a ferrite core or an iron powder core might be the better choice. For completeness, ... Magnetically…
zebonaut
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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 ferrite bead should be placed close to the device…
Nazar
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What do I need in order to build and test a ferrite rod antenna for a specific frequency?

I am trying to piece together what I'd need for a small hobby project. I'd like to build something that is basically the equivalent to a home made avalanche beacon finder. Avalanche beacons transmit at 457 kHz and from the bit of research I've done…
DanInMA
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Adding a gap to a core for an inductor

I'm in the process of designing an inductor for a boost converter, and I'm having a hard time finding exactly what I need for this project. I have found a core size/shape that appears to work except I can only get the core in the material I want…
W5VO
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Alternatives to transistors

I'm trying to think of alternatives to transistors, simply because I'm curious. I don't care so much about the amplifying characteristics of transistors as their ability to make logic gates. Here's what I've got so far, could somebody please add to…
Void Star
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Measuring ferrite core parameters

I have large amounts of inductors and transformers from power supplies or other undocumented sources. They are of course completely unmarked and I have no idea what kind of ferrite material they are made of but sometimes I would like to use them in…
jpc
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How does a ferrite core wire terminator work to reduce EMC?

The following question was asked on superuser: What is that cylinder on cables? How does that cylinder work? As far as I can tell, even if you put one on either end of the cable, any HF signal should travel straight past it. Is there an equivalent…
shieldfoss
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Ferrite vs. iron powder toroid for buck converters?

I'm wondering about the difference between small (13 mm outer diameter) ferrite and the yellow white iron powder toroids. Will the ferrite toroids saturate at 5 A current? I'm planning on using the cores for buck converters (mostly 3 A at probably…
Indraneel
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Why do toroid inductors have a square cross-section?

What is the reason behind the square cross-section of most toroid inductor cores? Correct me if I am wrong, but would not a circular cross-section give the lowest resistance since it has the smallest circumference compared to it's area? Is it…
Beacon of Wierd
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Capacitor and ferrite beads when to use which?

In this question Ferrite beads used to filter high frequency noise. Capacitor also can be used to reduced noise and filter out high frequency noise. Are they have the same effect on filtering high frequency noise or reducing EMI? When to use…
pstan
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Can I use ferrites for the ground connections?

I may have an issue with conducted EMI through the ground connections between devices in a system. There is specifically a device which clearly creates noise on the measured signal from another circuit with a scope (noise is reduced when it's off).…
Joan
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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 resistive impedance dominates the reactive impedance." Does…
Shannon
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Chokes vs. small capacitors on signal cables

I know that many signal cables (usb camera to computer cables, etc.) have bulky ferrite chokes on them to prevent noise. Why do they all have ferrites instead of ceramic capacitors? Small ceramics also get rid of noise effectively, and would be…
dpdt
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Why aren't ferrite rod antennas used in WiFi?

Does it have something to do with soft ferrite's low coercivity, still not low enough at gigahertz frequencies? See, I'm putting together high gain receiver antennas and transmitter antennas. Space is an issue. So maybe the same as ferrite rods…
Dehbop
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Is there a color standard for painted toroidal magnetic cores?

Is there a color standard for painted toroidal magnetic cores ? I noticed that yellow-white usually means a powdered iron core with a relative permeability of around 100 at frequencies below 10kHz. What do the other colors mean ?
George Robinson
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