Ferrite Bead
Hi all,
I always wondered about the small cylindrical shaped thing in the end of laptop charging cable, mouse/keyboard cable etc...I thought it would be for some protection or something. Dint had much idea on that. Last day i just googled about it and got the answer finally..Just sharing the info here..For those who dont know what its all about..
![[IMG]](proxy.php?image=http%3A%2F%2Fi53.tinypic.com%2F1zqg1p5.jpg&hash=5eb8050746515cb6fb3bf19ce70156a7)
A ferrite bead is a passive electric component used to suppress high frequency noise in electronic circuits. It is a specific type of electronic choke. Ferrite beads employ the mechanism of high dissipation of high frequency currents in a ferrite to build high frequency noise suppression devices. Ferrite beads may also be called ferrite blocks, ferrite cores, ferrite rings, ferrite EMI filters, ferrite chokes. Ferrite beads are used (in a way similar to inductors) as a passive low-pass filter. The geometry and electromagnetic properties of coiled wire over the ferrite bead result in a high resistive impedance (resistance) for high-frequency signals, attenuating high frequency EMI/RFI electronic noise. The energy is either reflected back up the cable, or absorbed resistively within the ferrite core and dissipated as low level heat. Only in extreme cases will the heat be noticeable.
For more info, just go to wikipedia and search for ferrite bead
Thanks,
Rohit
I always wondered about the small cylindrical shaped thing in the end of laptop charging cable, mouse/keyboard cable etc...I thought it would be for some protection or something. Dint had much idea on that. Last day i just googled about it and got the answer finally..Just sharing the info here..For those who dont know what its all about..
A ferrite bead is a passive electric component used to suppress high frequency noise in electronic circuits. It is a specific type of electronic choke. Ferrite beads employ the mechanism of high dissipation of high frequency currents in a ferrite to build high frequency noise suppression devices. Ferrite beads may also be called ferrite blocks, ferrite cores, ferrite rings, ferrite EMI filters, ferrite chokes. Ferrite beads are used (in a way similar to inductors) as a passive low-pass filter. The geometry and electromagnetic properties of coiled wire over the ferrite bead result in a high resistive impedance (resistance) for high-frequency signals, attenuating high frequency EMI/RFI electronic noise. The energy is either reflected back up the cable, or absorbed resistively within the ferrite core and dissipated as low level heat. Only in extreme cases will the heat be noticeable.
For more info, just go to wikipedia and search for ferrite bead
Thanks,
Rohit
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