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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31 views

How to characterize a wideband RF ferrite transformer

Transformer models incorporating intrinsic and parasitic elements are well known: The mutual and leakage inductances are calculated from measurements of the primary and secondary winding inductances ...
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47 views

Where to get the core for an electromagnet?

I understand that using a soft iron core or a ferrite core for an electromagnet increases the strength compared to an air-core. I'm going to be using DC current and want the core to be 5-8mm in ...
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Multiple windings on single ferrite ring vs multiple ferrite rings

My question is does putting cables through multiple identical ferrite rings the same as winding them multiple times on a single ferrite ring? I have my current setup as follows with multiple ferrite ...
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153 views

Can a ferrite bead accidentally rectify RF?

If the ferrite is designed to filter out in the lower region, up to 100 MHz, and the pass-band signal is even way lower, 60Hz, I'm thinking that the ferrite is constantly saturated along with the 60Hz ...
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41 views

Difference between ferrite pipe core and full ferrite core?

Disclaimer: I’m computer scientist It is possible to buy ferrite pipe core coils and full ferrite core coils. The seller sell them for audio applications. I’m considering using the coil to measure a ...
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105 views

Short circuited ferrite bead on PCB

I'm analyzing a circuit (USB game console.) Three identical ferrite beads (805 or 603 package) are used in the circuit. It was working but I tried something on circuit. Now it is not working. I ...
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86 views

Loopstick (ferrite rod) antenna circuit model

A ferrite rod antenna circuit equivalent is usually given as so: The numbers are made up, I didn't calculate the exact C you need to have to make it resonate at 1 MHz. Here's a slightly more ...
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352 views

EMC 30-50 MHz emssions

I was trying to pass EMC tests for my 48V 5A BLDC driver and failed in 30-50 MHz range. I think I found the problem in my drive circuit, but I have a few questions that got me thinking, maybe someone ...
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415 views

Why multiple coils on a ferrite rod antenna?

I'm trying to build some ferrite rod antennas to test some avalanche rescue technology and I've been looking at the internals of an old BCA Tracker avalanche beacon to figure out how I should go about ...
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115 views

Ferrite bead placement

I have a question regarding ferrite beads. I have this kind of circuit: Where IC1 and IC2 are digital ICs. The voltage supply for the opamps is obviously analog. I want to place a ferrite bead ...
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27 views

Ferrite underlay impact on chip antenna performance

I'm designing a small wireless chargeable IoT device which also has TX/RX in subGhz frequency (LoRa). The idea is to stack everything on top of each other starting with charger RX coil, then ferrite ...
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73 views

Ferrite Magnet as Ferrite Inductor Core?

I have a toroidal “ferrite” ceramic magnet lying around and am wondering what the similarities are (if any) between one of these that has been put in the oven to remove most of its magnetization and a ...
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22 views

The frequency rating of the snap ferrite

Snap on ferrites for power cables that are available on the the market are rated for frequencies varying from 1 to 300 MHz (most of them 100 MHz). I do not want any frequency to pass outside over my ...
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74 views

What is ferrite foil used for?

There is "ferrite foil" available on the market, often with self-adhesive layer on one side. What are typical use cases for this foil? How and where it is applied? I was surprised not to ...
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1k views

Question on EMI filtering

I have seen people using ferrite beads to suppress EMI from switching power supplies. Recently, I came across the following blog post where the author successfully re-models a switching power supply ...
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1answer
76 views

DC Inductor design for boost converter

I am working on the design and prototyping of a boost conductor. With that task in hand I have to design a DC inductor for a boost converter. I am using the material EPCOS N27 since its the only one ...
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189 views

Core loss kW/cm³: UNFAMILIAR FACTOR

Looking at a datasheet picture, I assume this is an SI system value Pcv core loss kW/m³. I haven't found this mentioned in my studying material. What does it mean? Also, related question, how come in ...
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186 views

Please Identify this adjustable inductor (ferrite-core bobbin)

Can anyone identify this component and suggest where to get more of them---or provide a manufacturer/model number? I need more for an HF radio project but haven't found them. These are for hand-...
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201 views

Ferrite core StepUP Transformer Design

So, I want to make a High-Frequency Ferrite transformer that can convert my 150-volt peak Square wave into 100000 Volt Peak. I am using UUR6440 Ferrite Core. Material is CF139 https://www....
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1k 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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165 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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63 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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317 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 ...
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117 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 ...
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1answer
210 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 ...
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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 ...
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86 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'...
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35 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 ...
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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. ...
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72 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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81 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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118 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 -...
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152 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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73 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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692 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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84 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?
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476 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 ...
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339 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, ...
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602 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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5k 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 ...
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186 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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59 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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381 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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56 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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124 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 ...
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340 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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90 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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2k 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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114 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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70 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 ...