Help! What are these?

[Ofiaich]

Hi everyone!

Doing a clear out and found these! No idea what they are for. Found them with booklets on a old Sony DAB radio. They have TDK stamped on them.

Any ideas what they are? Power surge dampers? Boosters.

Thanks!
Ofiaich!

[MickAP]

Ferrites…

Ferrites | HITEK Electronic Materials Ltd

I have some clamped around my dash cam cable

[Goosie]

They are Ferrite Rings used to reduce noise in mains cables

Ferrite bead

[Ofiaich]

Hi MickAP and Goosie!

Wow! Quickest responses ever! I found this, and it will teach me to search more in the future!

TDK Ferrite Core Clips for Noise Cancellation in Audio and Video Cables

Ofiaich!

[MickAP]

Yep, I think Richard member on here put me on to them.
One use for me was to clamp them around my dash cam feed cable, it helped to suppress interference that was coming from that to my DAB radio signal, well via the aerial.

[RichardFX]

They are also very useful for maximising ones broadband download speed.

Clamp a few on the incoming landline wiring in relevant places (where it enters the house, goes into the master socket, router input, etc) to prevent wifi or ethernet or mains-extender or DECT or Blutooth etc from sneaking in and upsetting the router’s very fussy VDSL input.

[Roadie]

Can often be found built in to Laptop power supply cables and printer USB cables.