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In Reply to: RE: I'm now on my 6th ferrite on p24 on the P24... posted by theob on June 10, 2011 at 04:52:04
Hi Theo,
Nice improvements huh ?
I also like it very much.
Hopefully there wil be no possible ‘deleterious effect’ as BiBo01 pointed at.
What is your ‘clamping strategy’ too keep DC & Low Frequency AC Bias Effects lowest possible?
Do you just clamp all ferrite clamps in a row (one after the other) on the P24?
Or
do you clamp individual combinations of + and – wires?
Also: if you use Ferrite clamps with large hole diameters (8 – 12 mm) , how do push the 2 mm + and – wires ontoo the ferrite inside the bead? The wires need too be in immidate and close contact with ferrite.
Mark
fully optimized cMP2 PC -> ESI Juli@ -> Van den Hul Optocoupler MkII-> Lavry Black DA10 -> XLR Mogami Gold -> Klein & Hummel O300
Follow Ups:
Don't know what you mean about low frequency bias perhaps you can elaborate a bit more. I'm just putting more clamps on as many groups of wires as possible. I try to keep black and red wires (at least 2 or more) in each ferrite.I try to space the ferrites but they are close. I put the clamps where I can easily access p24 wires. But it seems to work. I get more of an impact when the clamp is tight on the wires.
Hi Theo,See page 109 and 110 and figures: 14, 15, 16 and 17.
In particular: “the ferrite “sees” equal and opposite DC currents and thus zero net magnetic flux density. The ferrite will be able to provide maximum series impedance for high frequency common mode currents and remain unaffected by the DC operation of the encircled conductors”
So when not bundlling all 24 wires into one ferrite, one has too make a combination of wires that (at best) also will result in a ‘zero net magnetic flux density’.
So I’m curious what comibination of wires you bundle too achieve a ‘zero net magnetic flux density’.
Or, 2nd best (when it is not possible to make any combination of wires which results in zero-DC magnetic flux) what combination of wires do you bundle into one ferrite bead to achieve the lowest possible non-zero DC?
I’m especially interested in how to bundle the bleu -12 volt wire, the grey PWR-OK wire, the green PS-On/Of wire and the purple STD-BY wire. As I also expect HF-noise too spread through these wires, so I want too clamp these wires too.
Mark
fully optimized cMP2 PC -> ESI Juli@ -> Van den Hul Optocoupler MkII-> Lavry Black DA10 -> XLR Mogami Gold -> Klein & Hummel O300
Edits: 06/10/11 06/10/11
I do try my best to keep a + and - wire in a ferrite. am I combining the right ones? I'm not sure. Unless there is a way to know I just guess.
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