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.

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6
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2answers
901 views

How to compare a magnetic loop antenna to a conventional antenna

I want to build a compact 1 MHz receive coil (antenna for very near field). For that I need to make a choice on whether to build a simple RF coil only consisting of wire and capacitors or using a coil ...
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1answer
80 views

Gate drive transformer for lower frequency (25 kHz)

I am doing this half bridge to generate High voltage from 300VDC.(Around >10000Volts for a corona discharge tube to produce ozone) I have gone through many application notes for making one GDT for ...
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0answers
54 views

Inductor Core Material

I need to design an Inductor of 9.717μH to be used in a DC-DC Buck chopper for current of 10A. I finished the calculations using 3C94 core material. When I calculate the copper loss, it is 0.35W, and ...
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2answers
36 views

Ferrite rod antenna for DCF77 simulator

Where I live, in central Italy, the signal of DCF77 (the German longwave time signal and standard-frequency radio station, which operates at a frequency of 77.5 kHz) is so weak when it arrives, that ...
1
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1answer
55 views

Is there an easy way to interface a receiving 457kHz ferrite rod antenna with a microcontroller (BeagleBone Black)?

I have a (actually two crisscrossed) 457kHz ferrite rod antenna from the internals of an avalanche beacon where 196uH <= L < 204uH and C = 560pF. I need to be able to evaluate the data from the ...
3
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1answer
71 views

What material can I use to insulate NFC tags so they can be placed almost back to back?

I have posters with "Tap me to check in/out of this meeting room" drawn on them. I have NFC Stickers behind each poster to send the user to a specific URL in the application. They are being placed on ...
10
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5answers
2k views

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 ...
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0answers
45 views

Calculating inductance of inductor that has ferrite core and a large air gap

I'm working on a coil on a PCB that will have a small ferrite core place in the center, with a large gap. I'm trying to come up with a decent equation to estimate the inductance of this inductor. I'...
0
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1answer
33 views

Comparing transformer set ups

Is it practical to connect the output of a ferrite-core 1:40 transformer in series with the input of a 1:6 ferrite-core transformer as a means of acquiring 240 V?What would the pitfalls be of this ...
7
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2answers
386 views

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. ...
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2answers
51 views

Permeability Discrepancy of an Inductor

Background: I bought a material 77 ferrite rod for a homemade inductor. The core was 0.5" in diameter and 7.5" long with a claimed initial permeability of 2000. When I recieved it, I tested it out ...
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2answers
66 views

What can I use to increase efficiency of inductive wireless energy transfer instead of factory manufactured ferrite plates?

The Context I am a hobbyist with no education in electrical engineering. I am working on a DIY project trying to make water resistant rechargeable bicycle lights. I am doing this as a hobby for fun ...
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1answer
57 views

Is ferrite correct material to use for a DC current sensing application

I am trying to build a non-invasive current sensor using a hall effect sensor and ferrite core. I am using a hall effect sensor sandwiched between 2 halves of a ferrite core like this: ferrite core -...
1
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1answer
66 views

Equivalent model of my (real) transformer

I have created a transformer using a small cylinder (a tube) made of ferrite. The primary coil has \$N_{1}=5\$ turns of coil wire, while the secondary \$N_{2}=50\$ turns. According to a recent ...
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0answers
70 views

ferrite core code

I have a broken ferrite core with about 3.2mm air gap (I am not sure about it). I attached that core's picture the code is: Kaschke 4 . 14 871 . 10 01/07 How can I find the characterize about this ...
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3answers
262 views

Finding saturation field of ferrite core from manufacturer specs

I want to wind my own ferrite core inductors for some power conversion. However, I am having trouble finding out when the cores will saturate from manufacturer's data. For example, this material ...
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1answer
78 views

Why Ferrites are used as a cores for inductors

Why specifically we use the ferrites as a core for the inductors? For example a NiZn toroid as a core for an inductor?
0
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2answers
369 views

How to reduce the frequency of ferrite core transformer? [closed]

I am trying to do a inverter using ferrite core transformer, but the problem is the frequency output from the ferrite core transformer, If I am using that, I will be getting 230V AC but the frequency ...
3
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2answers
255 views

Is this symbol another version of a ferrite bead symbol?

I saw this symbol in the schematic of the ADPD2140z eval board. From what Ive seen online, ferrite bead symbols are usually slanted rectangles with right angled corners. This is slightly different, ...
2
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2answers
356 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:
9
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2answers
4k views

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 ...
0
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2answers
135 views

What can be said about the dB attenuation for this ferrite bead from its impedance graph?

If I use this ferrite bead for a USB cable, what can be said about the noise attenuation for 1 MHz and 10 MHz. The plot only shows the impedance versus frequency, whereas I would like to see the ...
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0answers
52 views

Is this setup proper to observe the attenuation effect of a common mode choke?

I'm trying to prepare a setup to see the effect of this torodial ferrite ring.. Even though I still didn't understand what way to wind wires to obtain a common mode choke(I saw differnt ways of ...
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2answers
236 views

Which way of winding the toroid ferrite ring is correct?

Following my previous question I'm trying to prepare a test to see the effect of a torodial ferrite ring. The setup will be simply as below: simulate this circuit – Schematic created using ...
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2answers
53 views

Can I create a continous gap in iron powder cores?

The iron powder core material, as you may know, has a continuous air gap in its structure. However, do you think it is possible to add a continuous air gap (for example 1mm) to the iron powder cores? ...
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0answers
102 views

Ferrite N87 losses below 10 kHz

I use ferrite N87 cores (datasheet), and I would need losses in the frequency range 50 Hz to 10 kHz. The datasheet on page 5 specifies losses between 25 kHz and 600 kHz. I could try to interpolate ...
6
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1answer
241 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 ...
1
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1answer
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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0answers
1k views

Push-pull converter transformer calculation

every one, I am an automation engineer, not an electrical, but I have some knowledge about electricity (I hope). I am designing a power supply with input voltage of 3,1V and the output voltage of 175V ...
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2answers
99 views

What is this circular rod with wired wrapped 'coil' and ceramic capacitor?

Found this in a battery compartment, glued with white gum, however not connected to anything. It is a ferrite circular rod of 3cm, diameter 6mm and wrapped with some wire (12/13 windings) and ...
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0answers
66 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 ...
2
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1answer
64 views

Best way to isolate RF Coupling (2,4 GHz - 2,5 GHz)

I bought an ADF4350 PLL board from china. On the board there are 10 pins (programming and supply) which are connected to my BLE board (with an integrated antenna). Im observing following problem: ...
1
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1answer
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 ...
2
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0answers
47 views

Selecting a stable operating point in a core loss vs temperature graph

Not a native english speaker so please bear with me. I want to build an Inductivity of 10uH for a sinewave current (50kHz, 0.5A RMS) and calculate the magnetic resistance . Magnetic Flux should stay ...
0
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1answer
364 views

Ferrite core through PCB, how to close? [closed]

While opening what is labelled as a "Badge Isolator" from a dishwasher, a Ferrite core broke. The core goes through the PCB, and is comprised of a U part and an I part. I am going to assume that the ...
2
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1answer
160 views

HV Pulse Blocking with Common Mode Choke

I need to apply a reset current to a magnetic core on the same circuit as a ~25kV 30ns long pulse. I know there are a number of ways to do this, but for simplicity sake I would like to protect my ...
0
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2answers
706 views

Can I overlap magnet wire when wrapping a toroid or must it progress linearly around the circumference?

I've been playing with inducing magnetic fields in a ferrite toroid with turns of magnet wire. Can you overlap, e.g. double back over the previous turns so I don't need a larger toroid?
2
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2answers
4k views

ATtiny85 and high frequency PWM for driving a ferrite transformer

Some background: I have an ATtiny85 running at 8 MHz under the Arduino IDE. I have been gifted a large ferrite transformer and some MOSFETs & drivers to drive it. However I am lacking a ...
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2answers
1k views

Inductors, Toroid or EE Core?

I'm designing a voltage mode PSU for learning purposes. I've noticed that powdered iron toroids are almost exclusively used in the construction of PFC inductors as well as in low voltage boost ...
0
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1answer
586 views

Encapsulating an inductor with epoxy and ferrite powder

Say I have some SMD inductors and I'm trying to limit their EMF from the rest of the board, can I simply potty it with epoxy mixed with ferrite powder (or perhaps iron filings), if I make sure the ...
0
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1answer
547 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 ...
3
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2answers
587 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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1answer
1k views

How to find Steinmetz parameters from datasheet?

Given a certain core material I would like to know where and how I can extract the Steinmetz parameter from its datasheet. Hope someone can help me out. Thanks. datasheet: https://en.tdk.eu/inf/80/...
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0answers
48 views

Can I improve the high-frequencies absorption of a ferrite inductor with two opposite winding directions?

A choke if effective against common mode currents by having two windings in opposite direction around the same core. Currents common to both wires produce opposing magnetic fields and get cancelled. ...
2
votes
1answer
710 views

Difference between RF ferrite and normal ferrite

Why oscillation stops in a RF oscillator(over 100MHz) if I replace the air core Inductor with a normal ferrite core inductor ? But starts oscillating again if I rewind the inductor over a RF ferrite ...
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0answers
158 views

ferrite core replacements with passives

I am using a ferrite core to remove video noise in an NTSC video system. I am using the ferrite core on the video and video GND lines. I am merely winding the video and video GND lines on the ferrite ...
0
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1answer
112 views

A question about using ferrite chokes in a data-acquisition system

I'm planning to buy [this flat ferrite choke][1] for ribbon cable to suppress suspected EMI on a data acquisition's multiplexer. I have no experience on signal integrity. Bu the system setup is ...
2
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0answers
168 views

GSM interference on an wireless micrphone

I am getting GSM Buzz on a wireless micrphone system. The interference is coming from the Micrphone itself as it is transmitting it in the audio and is not being caused by direct RF interference with ...
3
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3answers
4k views

Simple AM radio - how to modify it so it can work without ferrite rod antenna?

I am a beginner in electronics and I'm currently the most interested in RF-related topics. I did build simple AM receiver usind good old TA7642 and, after adding small 9V amp, the radio broadcast can ...
0
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1answer
306 views

Ferromagnetic core with air gap

N=200 I=N*8A l=20cm=2*10^-1 d(delta)=1mm=10^-3 M=? M=(B/μ)-H How can I get the vector of magnetization? The relative permeability is not known. Everything I ...