Ferrite ring

[Titanium]

Hey all experts here... is adding a ferrite ring to the audio cable really able to reduce its interference?

 

And... how much is a ferrite ring?

 

Thank you!

Edited April 10, 2008 by Titanium

[Dwoon]

What I understand about ferrite is to prevent radiated emissions rather than prevent receiving it.

 

Also, different ferrites will filter only a certain range of frequencies (not a one size fit all), so the choice of ferrites for a particular application needs to be decided based on the emission frequency detected.

 

If you should want one to try, do let me know.

[Apollo]

beri chirp.. 1 pc less then $2. sim lim tower, leber 3 or 4, those selling resistors and capacitors shop hv. just remember to double loop the cable across the bullnose.

[Titanium]

wah... chim leh.

 

recently i bot a small speaker gadget, but got interferences leh, so thinking of ways to reduce it...

[Dwoon]

Maybe can lor.... mean you're suppressing the emissions from this gadget to the speakers right? But this gadget got wires?

 

If suspecting the emissions are radiating from the wires, then to be effective, the ferrite core should be wound as close/short as possible, to the point where it comes out of the board. Also, the more coils round the ferrite core makes for better suppression.

 

But if the emissions are coming from some other areas of the gadget, then putting the ferrite on the wires is not gonna help.

 

This is as much as I know.

[Bobcatsysop]

I bought these TDK branded ferrites from Sim Lim Tower #03-47 Handy Electronics 2 sizes.. the smaller ones (for standard thin wires) are at @$2.60each while the bigger holed ones (for thicker wires) at around $4.00 per pce.

 

[Dwoon]

These are good for cases whereby you can't get the connector head through the hole of the ferrite, or when you cannot detach the wires to do the coiling. (Perhaps EMC investigative work).

 

But in terms of effectiveness, the totally round rounds have better suppression properties.

[Maxyeo]

lotsa old man playing those expensive home hifi always buy for their system ...

[Titanium]

ok... the thing is like this.

 

I just bot a 2.5" HDD DivX player and a X-mini capsule speaker (See attached).

 

This X-mini capsule speaker come with a weird cable (mini-usb to stereo mini plug).

 

So whenever i connect this 2 gadgets together, i will get some interference which does not happen on other speakers or earphones.

 

so i suspect...

 

1) The coaxial port of the divx player is producing interference.

2) The weird cable is not shielded.

 

 

[Titanium]

so does it really work?

[Titanium]

Oh no! i becoming old man le...

[Apollo]

old?

 

dun worry, soon they will come out with Power II donut. u'll feel stronger, hump longer...

 

 

 

and probably die faster...

[Apollo]

the HDD is too close to the speaker. the magnet onboard the HDD is probably the cause of EMF

 

no ferrite ring will help, get a longer USB cable to test out

[Titanium]

i extend the cable to the max liao (ard 70cm), but still the same leh...

 

correct me if i m wrong, if the onboard magnet causes the EMF? then i think my other speaker /earphone shld also have this prob mah, tio bo?

[Apollo]

mebbe u place the HDD onto a plastic to see if this will prevent static electric discharge

 

0.70 is no long, try extending further to see

[Bobcatsysop]

Your priority now is to separate your HDD with your speaker as far as possible.

 

First try putting the HDD down to the lowest shelf and put your speakers to the highest shelf of your computer table. Hope this helps.

[Titanium]

tried with anti-static bag still no go...

[Titanium]

sama sama...

 

Think i bo bian liao, got to accept it already.