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Old 24th September 2013, 04:44 PM   #11
jcx is offline jcx  United States
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Really? Blind, level matched, ability to switch fast?

(you don't have to just ABX with short listening/fast switching but it does improve discrimination of some sound differences in controlled testing - so you really need the capability so you can compare on several time scales)



and its likely the actual inner electrodes in monolithic mlcc don't have Ni, some are even Ag – but there may be a barrier layer of Ni plating under the terminal plating to prevent leaching during soldering

Last edited by jcx; 24th September 2013 at 04:54 PM.
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Old 24th September 2013, 04:47 PM   #12
marce is offline marce  United Kingdom
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I am talking about very sensitive stuff...
All things are magnetic one way or another, how can a bit of nickel in a small cap affect an A.C. signal?
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Old 24th September 2013, 05:10 PM   #13
jcx is offline jcx  United States
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Quote:
how can a bit of nickel in a small cap affect an A.C. signal?
apparently in a way that doesn't show in "conventional measurements" - like harmonic distortion at -140 dB down

but there are components made for NMR machines – with no (ferro)magnetic materials at all

Quote:
Originally Posted by scott wurcer View Post
I will simply quote the results from Samuel Groner's thesis.

Distortion of capacitors at +20dBu on the capacitor, 1kHz

Polysyrene LCR components FSCEX 10nF - no visible harmonics above -153.4dB noise floor (none nada zilch)

Vishay MKP1837 PP film - same

Vishay COG/NPO - same, noise floor -142.5dB (ceramic BTW, this was 1nF which I assume is why the noise floor was higher)

Dick, I'm not being a trouble maker and I'm asking nice could you please show me schematically how to put a sine wave through a C with rectifying defects at the input to get the cancellation of distortion.

Last edited by jcx; 24th September 2013 at 05:13 PM.
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Old 24th September 2013, 06:37 PM   #14
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Quote:
Originally Posted by jcx View Post
but there are components made for NMR machines with no (ferro)magnetic materials at all
Interesting - do you have any info / links?
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Old 25th September 2013, 08:09 AM   #15
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Hi All,

- have just had a quite special morning riding my bike along the coast line of Aarhus where I live. The sun was rising and reflected against a thin layer of clouds with yellow/orange pastel colors. Wow! - I really find myself gifted living where I do ...

And then about the capacitors:

@RayCtech: Thanks (once more) for offering to help me with components I'll send you a PM about it shortly.

Quote:
Interesting - do you have any info / links?
I've found these from Vishay that appear to be non-magnetic and possibly also have an interesting termination ("noble metals"):

http://www.vishay.com/docs/45128/vjn...eticseries.pdf

They're available in C0G types but as far as I can see not in a copper foil. Max value is 39 nF for the C0G types.

@jcx:

Quote:
Originally Posted by scott wurcer .... I will simply quote the results from Samuel Groner's thesis.
Hi jcx ... Might you have a link to Samuel Groner's "thesis"? I searched for it yesterday but didn't really find any ...

And then a thanks to all for considering my question by answering

Jesper
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Old 25th September 2013, 09:42 AM   #16
marce is offline marce  United Kingdom
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Quote:
apparently in a way that doesn't show in "conventional measurements" - like harmonic distortion at -140 dB down
So nothing that is going to be audible.

NMR machines create very strong magnetic fields, hence you don't want ferro-magnetic materials in there, audio is a bit different.
I would love to see some hard evidence of such a tint amount of nickel affecting the sound, in a way that is audible.
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Old 25th September 2013, 05:49 PM   #17
jcx is offline jcx  United States
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yes Vishay lists nonmagnetic parts
2010 Super 12

Syfer (Cu):
http://www.google.com/url?sa=t&rct=j...pd4BOX1a6y8gfw

Last edited by jcx; 25th September 2013 at 05:55 PM.
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Old 26th September 2013, 07:45 AM   #18
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@jcx: Thanks for the tip on the Syfer capacitors - looking into it ;-)

Cheers,

Jesper
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Old 27th September 2013, 07:14 AM   #19
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Quote:
Originally Posted by marce View Post
So nothing that is going to be audible.

NMR machines create very strong magnetic fields, hence you don't want ferro-magnetic materials in there, audio is a bit different.
I would love to see some hard evidence of such a tint amount of nickel affecting the sound, in a way that is audible.
Harmonic distortion are the very least issue that matters...
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Old 27th September 2013, 07:18 AM   #20
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Quote:
Originally Posted by gentlevoice View Post
@jcx: Thanks for the tip on the Syfer capacitors - looking into it ;-)

Cheers,

Jesper
As they use / can use different dielectric materials further investigations into this will be interesting..
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