|
||||||||
farrite things |
![]() |
|
|
Thread Tools | Search this Thread |
|
|
#1 |
|
Forum Member
Join Date: Jan 2006
Posts: 7
|
farrite things
Forgive a dopy question but what are the ferrite things that are sometimes supplied to clip around cables? They never seem to make any difference but what are they supposed to do.
|
|
|
|
|
Please sign in or register to remove this advertisement.
|
|
|
#2 |
|
Forum Member
Join Date: May 2004
Location: Reading
Posts: 27,928
|
They are used to suppress interference in whatever cable they are attached to.
For example a dirty or worn heating thermostat when it switches off can induce a great deal of noise into the mains wiring. This takes the form of very short duration spikes in voltage. A ferrite ring changes the inductance of the cable which has the effect of making it more difficult for it to pass these short duration spikes. So they get removed to a certain extent reducing the potential for them to disrupt, say, the sound or picture in your TV/HiFi/Freeview/Satellite system. |
|
|
|
|
|
#3 |
|
Forum Member
Join Date: Jan 2006
Posts: 7
|
Thanks for that. So they are normally fitted on speaker cables or for example a mains cable to a plasma screen?
|
|
|
|
|
|
#4 |
|
Forum Member
Join Date: May 2004
Location: Reading
Posts: 27,928
|
Quote:
Originally Posted by fylor
Thanks for that. So they are normally fitted on speaker cables or for example a mains cable to a plasma screen?
Mainly they would be used on signals going INTO a device. For instance the phono lead between a CD player and amp in a HiFi system. Putting them on speaker leads is a tad pointless as any "damage" to the sound by an interferance spike has already been done by it passing through the amp circuits. |
|
|
|
|
|
#5 |
|
Forum Member
Join Date: Feb 2004
Location: Bristol.
Posts: 1,783
|
They can be fitted to speaker cables, but it's unusual unless you're finding the speaker cables are acting like a big antenna which can happen if you live in an area where local sources of rf cause a problem with your hi-fi.
|
|
|
|
![]() |
|
All times are GMT. The time now is 17:16.

