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In Reply to: RE: Effect of ferrite beads on dc power lines too P24, P4 and/or too Pico PSU’s posted by theob on May 28, 2011 at 06:16:40
Hi Theo,
I searched the house and found the missing ferrite bead.
I’m happy too report back too you that I got the same sonic improvement as you described!
I clamped it around the P4 power supply line coming from a (cheap: 60 euro’s) linear power supply.
And although coming from a linear PSU, the sonic improvement is exactly as you described it !
I can’t wait the 16 clamp on ferrite beads (with various wire diameters ) too arrive, too start various experiments.
Did you experiment already with 1 or more windings?
(I can’t do this yet with the lost ferrite bead I found back, because the centre hole of that bead is too narrow)
Mark
fully optimized cMP2 PC -> ESI Juli@ -> Van den Hul Optocoupler MkII-> Lavry Black DA10 -> XLR Mogami Gold -> Klein & Hummel O300
Follow Ups:
I tried a rather large ferrite core around the entire bundle of p24 and hardly noticed a difference. I did put other cores around power cords of my crossover/dac and juli@ 3.3 volt feeds and got a small bit of a sq change. Biggest change is still the p4 core. Don't understand why.
Edits: 05/31/11
Went to an Electrical Parts store (RS Electronics in the US) and got some real huge ferite cores put 2 of them around p24 and another around p4 and that is more like it. Sounds less bright but yet more detailed and more space around all instruments.
Very smooth.
Hi Theo
I can’t wait until mine will be delivered.
According the track & trace service they will be delivered tomorrow
So I can start clamping.
Good too hear that you now have obtained better results on the P24.
The effect of clamping a ferrite bead on the linear (!) 12 V DC P4 line in my setup was rather big.
It was a real significant improvement.
I could hear the improvement immediately.
No long listening sessions needed for that.
As you also already wrote: I have no explanation either for the significant SQ improvement.
I know that ferrite beads ‘filter’(present high resistance for) high frequency’s.
And I also expected that lowering HF noise levels would increase SQ
But what is exactly happening here, I don’t know.
Is the ferrite bead blocking HF noise coming from the MoBo onto the P4 line?
Or vice versa? Is my linear psu producing HF noise which is blocked by the ferrite?
What is exactly happing here that is causing the SQ improvement?
Anyway, it works very well !!
Untill now at least.
The total DC current in the P24 is high. Around 3.5 – 3.8 amps
Reading the ‘Steward’ article, that is much current to apply ferrites on.
Steward proudly presents in that article, that some of there ferrites can handle 4500 mili amps (4.5 amps) and still keep functioning without saturation or so.
So I will follow Bibo’s advice and remove them after 3 weeks, too check if the ferrites are still effective.
Can you provide a link or name or partnumber or model of which type of the ferrite beads that you are using?
Mark
fully optimized cMP2 PC -> ESI Juli@ -> Van den Hul Optocoupler MkII-> Lavry Black DA10 -> XLR Mogami Gold -> Klein & Hummel O300
No part number. The ferrite is about an inch long and a half inch square at the end (this includes the white clamp). It all but fits the p24 bundle so I taped it it to be secure. Place from which I bought it only offers this one brand/style so I'll go back and buy the rest and find out their source.
Hope that helps.
Its 28A2029-0A0 2 pc ferrite bead w/nylon case mfg by Stewart.
Please try to remove the ferrite bead after a couple of weeks.
And see if you get the same improvement again.
Ferrites lose their effect when DC goes through them.
Actually, Charles Hansen (of Ayre Acoustics) claims that an extended period of DC creates a deleterious effect, with demagnetization needed.
Hi Bibo01,
It just sprang to mind that Charles Hansen might be pointing at saturation of the ferrite by a large DC magnetizing force. As described on page 109 and 110 in the article from ferrite manufacturer ‘Steward’ (see link below)
According the article this can be prevented by always feeding only a pair (or group) of wires through the same ferrite bread, that carry equal and opposite direct currents. This too ensure that there are always equal but opposite DC currents, which will result in a zero net magnetic flux density, this way preventing saturation of the ferrite.
It is good that you brought this too attention.
The P24 supply cable on which I also want too try the ferrite breads, consists of eight black ground wires, five red 5 Volt wires, 4 orange 3,3 Volt wires and two yellow 12 Volt wires.
In a cMP setup these wires carry approximately:
- 3,5 amp on the five 5 volt red wires,
- 0,3 amp on the four orange 3,3 Volt wires
- 0,12 amp on the two 12 Volt wires.
So careful cable-dressing amongst the black and the colored wires might be necessary, so too try too distribute all opposite fluxes evenly throughout the inside of that cable bundle.
May be it might also be a good thing, once that cable is dressed up, too twist that dressed up cable bundle a few times, so to make all wires in that cable bundle too come too the surface over some distance, in order too bring all wires close too the ferrite for some length inside the ferrite bread.
Anyway, thank you for pointing on the possible saturation of the ferrite bread. As I think this is what Charles Hansen probably ment.
Mark
fully optimized cMP2 PC -> ESI Juli@ -> Van den Hul Optocoupler MkII-> Lavry Black DA10 -> XLR Mogami Gold -> Klein & Hummel O300
Hi Bibo01,
Thank you for the tip.
Not because of that I think that ‘ferrites lose their effect when DC goes through them’ but because I find your tip very useful for testing the ‘placebo’ effect. Every tweaker is always at high risk to be fooled by the ‘placebo’ effect.
I never red or heard anything about such fenomenon untill now. Ofcourse that doesn’t mean that Charles Hansen claim is not correct. I try and see what comes up through the net after some google-ing. But if I can not find any serieues articles on that effect, than I will consider it not too be true.
Mark
fully optimized cMP2 PC -> ESI Juli@ -> Van den Hul Optocoupler MkII-> Lavry Black DA10 -> XLR Mogami Gold -> Klein & Hummel O300
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