The mods never end, adding Goudreau's triplets - Page 2 - diyAudio
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Old 23rd September 2002, 04:58 PM   #11
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Did you get any resonance from stacking two chips of different capacitance in the same form factor?
I made some measurements years ago that showed stacking smaller film caps on top of larger ones definitely caused resonance problems.

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Old 23rd September 2002, 07:10 PM   #12
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Quote:
Originally posted by Jocko Homo


I made some measurements years ago that showed stacking smaller film caps on top of larger ones definitely caused resonance problems.

Fortunately I did it the other way, I put the larger one on top.

Anyway, how you check for resonances?
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Old 23rd September 2002, 08:59 PM   #13
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Default Anyway, how you check for resonances?

1.First get a degree in Electrical Electrical engineering.
2. Go to work for a company with a 500MHz Network Analyzer.
3. Read the directiions for Analyzer in step 2.
4. Measure resonances.
I am pretty sure that is how Pete did it but I think his degree in Physics.

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Old 23rd September 2002, 10:59 PM   #14
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OUCH what was with that..

THAT was mean..
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Old 23rd September 2002, 11:02 PM   #15
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I don't think it was mean. I just got what I asked for, unless he was not telling the truth.
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Old 23rd September 2002, 11:11 PM   #16
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Default THAT was mean..

Acually I was having a bit of fun. This kind of thing is pretty difficult to measure and I was just trying to make that point. I believe they probably is some advatange to this approach and I bet money Pete did measurements pretty much as described since he is an RF and signal integrity expert. No harm intended.
Measuring supply noise with a 100MHz scope is a good starting point for most of use mere mortals.

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Old 24th September 2002, 08:55 AM   #17
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What about adding a high value ceramic 1206 or 1210 cap (4.7uF or 22uF) to the triplet, if you have room for it. I've made some measurements (no audio results yet), and found that these little chips do a tremendous job removing digital supply noise, when combined with such a triplet.
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Old 24th September 2002, 02:33 PM   #18
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I've seen your thread and this is what inspired me to do it. I just followed Goudreau's artcle and he didn't mention the other caps (4,7u). It might be interesting to add them later, when I get familiar with the sound and see for a difference.
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