RJ #1 Posted May 16, 2003 On a couple RCA cables I got w/ my8-bit(s), there's a round, about 1-inch diameter black thing about 3-4 inches from one end. It says "Chelco" (obviously the maker) & says "this end to computer". It's attached to the cable w/ a Philips head screw. Is it some sort of surge protection or what? Quote Share this post Link to post Share on other sites
Callipygous #2 Posted May 16, 2003 Do not remove that thing under penalty of law! I believe that is a toroid coil to reduce interference in the RF signal. Quote Share this post Link to post Share on other sites
RJ #3 Posted May 18, 2003 Ah, OK... There's a similar thing on my Sony PS/PS2 controller cables, not round but cylindrical, & weighty. What's that? Quote Share this post Link to post Share on other sites
Jetboot Jack #4 Posted May 18, 2003 Same thing.... Cable wound round or passed through a fixed magnet to eliminate potential RF noise. USB and many more PC type cables often feature one too... sTeVE Quote Share this post Link to post Share on other sites
Noeljb #5 Posted September 21, 2003 Oh that. Thats a Black Semi Spheroid Dounut Thingy. It uh ... keeps you from uh ... becoming uh sterile. yea thats it steriile. Quote Share this post Link to post Share on other sites
ZylonBane #6 Posted September 22, 2003 Also known as an RF choke. Probably has a solid ferrite core inside, not windings. http://www.rfparts.com/choke.html Quote Share this post Link to post Share on other sites
Bryan #7 Posted September 22, 2003 Yep, they come in several varieties, but basically a ferrite rod, bead or donut is used to turn a small section of the wire into a very low value inductor. This reduces the ability of the wire to act as an RF broadcast antenna. -Bry Quote Share this post Link to post Share on other sites
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