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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.

3
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2answers
89 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, ...
0
votes
2answers
31 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:
7
votes
2answers
784 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
votes
2answers
69 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 ...
0
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0answers
41 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 ...
1
vote
2answers
78 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 ...
1
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2answers
42 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? ...
0
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0answers
41 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
votes
1answer
141 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
vote
1answer
60 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 ...
0
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0answers
421 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 ...
1
vote
2answers
83 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 ...
1
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0answers
51 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
votes
1answer
58 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
vote
1answer
865 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
41 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
votes
1answer
185 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
votes
1answer
107 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
335 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
votes
2answers
2k 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 ...
0
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2answers
639 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
363 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
225 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
334 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.
0
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0answers
257 views

Ferrite ETD transformer core “clicking” and output losing power (solved)

I have an half-bridge SMPS design whose output is connected to a piezo load via a ETD core transformer. SMPS input voltage is 60 V, working frequency is 123 kHz. The SMPS draws about 400 W from the ...
0
votes
1answer
597 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
46 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. ...
3
votes
1answer
526 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 ...
0
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0answers
115 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
votes
1answer
84 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
votes
0answers
103 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
votes
3answers
3k 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
votes
1answer
259 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 ...
4
votes
2answers
3k views

How to properly wind a high frequency / high voltage transformer?

Please, is there any practical tip / caveat I should be aware, when winding a high-frequency transformer? I'm used to wind 50/60Hz transformers and they do work ok, but now I'm trying to make a high ...
5
votes
3answers
749 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 ...
1
vote
2answers
387 views

Ferrite core inductor for antenna

I am going to build the inductor in the figure above. I have a ferrite core with a relative permeability of about 70. Based on ARRL formulas, I have plenty of core length to separate the two coils ...
8
votes
3answers
681 views

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 ...
0
votes
1answer
845 views

Suggestions about proper usage of vk-200 choke

I have an old custom-built non-switching 5V power supply (usual 220V-12V transformer + bridge + 7805 regulator + various capacitors) that I'm using to power a HF upconverter and a HF LNA. I'm ...
10
votes
4answers
3k views

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 ...
1
vote
2answers
416 views

Peak Voltage Ratings of SMD Inductors

Off the shelf SMD Ferrite coils are widely available and popular .The power ratings are adequate for many applications.The manufacturers are clear about the current ratings for saturation and copper ...
2
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0answers
123 views

High Frequency Ferrites for Transformers

There are many Ferrite material grades Available.The optimum frequencies start around 20KHz and extend well into the MHz range.There are also many core sizes to go from watts to Kw .Planar cores are ...
1
vote
1answer
634 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). ...
0
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0answers
281 views

Ferrite core characterization

I need to make a dc dc converter and have some ferrite toroids but I don't have the datasheet of the cores so I need to know how much energy are capable do store the core and what current can they ...
2
votes
3answers
2k views

calculate battery voltage using pic ADC

I need to calculate battery voltage using my PIC's ADC. My battery voltage is 24V and ADC has a 12 bit resolution, the PIC operating voltage is 3.3V. I am using the PIC's internal Vref+ and Vref- ...
3
votes
2answers
682 views

Selecting the right ferrite core for high currents

I need to design some \$3.7 mH\$ coils for two low-pass filters and a \$5\mu H\$ coil for a boost converter. But am having some trouble finding suitable ferrite cores, since there will be a ...
0
votes
1answer
80 views

Where and how do I put an inductor on a volume control

I built an stereo equalizer but I made some mistakes. As the potentiometers didn't fit on my PCB I had to put them separated and make the connections with some wires. The other mistake is that I made ...
0
votes
1answer
153 views

Looking for possible cause for poor regulation in self designed transformer

I am trying my hand at designing and winding my own ferrite transformer for a push pull 1000watts dc-dc converter from 10-12vdc to 400vdc, with copper foil of 0.3mmx30mm for the primary, and copper ...
8
votes
2answers
3k views

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 ...
-1
votes
1answer
698 views

RF - separate transmitter and receiver antennas for half duplex

i was wondering why is it for just half duplex systems, don't we have a dedicated transceiver and a dedicated transmitter antenna. ok, just hear me out... assuming we are using grounded monopoles, ...
2
votes
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 ...