ferrite core ring noise suppressor

[supernova777]

http://en.wikipedia.org/wiki/Ferrite_bead

A ferrite bead is a passive electric component that suppresses high frequency noise in electronic circuits. It is a specific type of electronic choke. Ferrite beads employ the dissipation of high frequency currents in a ferrite ceramic to build high frequency noise suppression devices. Ferrite beads may also be called blocks, cores, rings, EMI filters, or chokes

i noticed some edirol products came shipped with these to block noise
on headphone + signal inputs + outputs

anyone have experience using these to eliminate unwanted noise?

they are quite cheap:
http://www.ebay.com/itm/6-x-Clip-On-EMI-RFI-Noise-Ferrite-Core-Filter-for-7mm-Cable-/121525349805?pt=LH_DefaultDomain_0&hash=item1c4b79adad

i think i have seen them packaged with items i have bought but i didnt understand what it was for!

[supernova777]

[youtube]http://www.youtube.com/watch?v=81C4IfONt3o[/youtube]

[mrhappy]

That was a pretty interesting video!