What is the Purpose of the Ferrite Core?
- Thread starter mrvlman1
- Start date
Nathan Beaman
Well-known member
It also sends copies to me and I swear mrvlman - thats some f**ked ****.
No, really - it doesn't need to be attached it is mearly a suggestion.
Ferrite Cores are designed to reduce line interference - especially useful in data applications.
Line interference may come from other electrical devices or other data devices for that matter.
Here is a better explanation I just found for you
A ferrite bead is simply a hollow bead or cylinder made of ferrite, which is a semi-magnetic substance made from iron oxide (rust) alloyed with other metals. It slips over the cable when the cable is made, or it can be snapped around the cable in two pieces after the cable is made. The bead is encased in plastic -- if you cut the plastic, all that you would find inside is a black metal cylinder.
Computers are fairly noisy devices. The motherboard inside the computer's case has an oscillator that is running at anywhere from 300 MHz to 1,000 MHz. The keyboard has its own processor and oscillator as well. The video card has its own oscillators to drive the monitor. All of these oscillators have the potential to broadcast radio signals at their given frequencies. Most of this interference can be eliminated by the cases around the motherboard and keyboard.
Another source of noise is the cables connecting the devices. These cables act as nice, long antennae for the signals they carry. They broadcast the signals quite efficiently. The signals they broadcast can interfere with radios and TVs. The cables can also receive signals and transmit them into the case, where they cause problems. A ferrite bead has the property of eliminating the broadcast signals. Essentially, it "chokes" the RFI transmission at that point on the cable -- this is why you find the beads at the ends of the cables. Instead of traveling down the cable and transmitting, the RFI signals turn into heat in the bead.
courtesy
http://computer.howstuffworks.com/question352.htm
No, really - it doesn't need to be attached it is mearly a suggestion.
Ferrite Cores are designed to reduce line interference - especially useful in data applications.
Line interference may come from other electrical devices or other data devices for that matter.
Here is a better explanation I just found for you
A ferrite bead is simply a hollow bead or cylinder made of ferrite, which is a semi-magnetic substance made from iron oxide (rust) alloyed with other metals. It slips over the cable when the cable is made, or it can be snapped around the cable in two pieces after the cable is made. The bead is encased in plastic -- if you cut the plastic, all that you would find inside is a black metal cylinder.
Computers are fairly noisy devices. The motherboard inside the computer's case has an oscillator that is running at anywhere from 300 MHz to 1,000 MHz. The keyboard has its own processor and oscillator as well. The video card has its own oscillators to drive the monitor. All of these oscillators have the potential to broadcast radio signals at their given frequencies. Most of this interference can be eliminated by the cases around the motherboard and keyboard.
Another source of noise is the cables connecting the devices. These cables act as nice, long antennae for the signals they carry. They broadcast the signals quite efficiently. The signals they broadcast can interfere with radios and TVs. The cables can also receive signals and transmit them into the case, where they cause problems. A ferrite bead has the property of eliminating the broadcast signals. Essentially, it "chokes" the RFI transmission at that point on the cable -- this is why you find the beads at the ends of the cables. Instead of traveling down the cable and transmitting, the RFI signals turn into heat in the bead.
courtesy
http://computer.howstuffworks.com/question352.htm
khmuse
Tech Guru
They are often used to reduce the RFI and EMI that the cable might radiate. The methodology is to increase the common mode inductance by the presence of a higher permeability material than the air core (absence of the ferrous material) alone. The effect can be further increased by causing the number of turns to increase by looping the conductor though the core more than once.
Since the conductors of a cable have both in and anti phase physical paths, only the currents which would be radiated (those that are not in balance between the two conductors) have their inductance increased. Therefore the bandwidth is not diminished (as would occur if an inductor was placed in series with one or both paths) only the leakage inductance is increased.
Since the conductors of a cable have both in and anti phase physical paths, only the currents which would be radiated (those that are not in balance between the two conductors) have their inductance increased. Therefore the bandwidth is not diminished (as would occur if an inductor was placed in series with one or both paths) only the leakage inductance is increased.
Shooter
Veteran
Erdiaz lives in Colombia so he has more reasons then most of us to worry about the CIA.
Erdiaz: I heard you and got the humour in your response.
(I hope this email gets past my Ferite Filter and they are not opening a file on me at the CIA as I type.) I am not paranoid...they really are out to get me.
Erdiaz: I heard you and got the humour in your response.
(I hope this email gets past my Ferite Filter and they are not opening a file on me at the CIA as I type.) I am not paranoid...they really are out to get me.