[sdiy] SSI2144 filter caps

Neil Johnson neil.johnson71 at gmail.com
Tue Sep 12 14:11:26 CEST 2017


Interesting paper from Kemet:

http://www.kemet.com/Lists/TechnicalArticles/Attachments/53/2008-03%20Advances%20in%20Class-I%20C0G%20MLCC%20and%20SMD%20Film%20Capacitors.pdf

Neil


On 12 September 2017 at 12:46, Mattias Rickardsson <mr at analogue.org> wrote:
> X7R and similar deramics can be microphonic - mostly problematic in a
> differential application, but test & verify it also in others. They
> also have a strong voltage dependency, which is not only a problem if
> there is a DC offset, but it immediately distorts all signals that are
> non-zero. Which useful signals tend to be. ;-)
>
> Rumor is that C0G / NP0 (those are both zeros!) caps tend to be free
> from these problems and I trust them a lot... but still, worth a test
> or two. We recently experienced microphony on a prototype with caps
> that were allegedly C0G.
>
> /mr
>
>
> On 12 September 2017 at 13:20, Steve <sleepy_dog at gmx.de> wrote:
>>
>> What about ceramic caps being microphonic, and the effect of changing capacity when there's a DC offset, are C0G / NP0 free from those effects?
>>
>> - Steve
>>
>>
>>
>> Guy McCusker wrote:
>>
>>> Didn't Ian Fritz teach us that NP0 is just as good as polystyrene?
>>> (Provided you can obtain a cap of the correct value of course.)
>>
>>> Right now all I can find is this message in the archives:
>>> https://synth-diy.org/pipermail/synth-diy/2011-April/031915.html
>>
>>> If Ian has more to say I would love to hear it...
>>
>> On Tue, Sep 12, 2017 at 8:28 AM, Roman Sowa <modular at go2.pl> wrote:
>>> I used NPO 0603 ceramics, and it sounds great.
>>> http://www.synthdiy.eu/files/2144.jpg[http://www.synthdiy.eu/files/2144.jpg]
>>>
>>> There are also 3 audio examples in my Soundcloud if anybody is interested.
>>>
>>> Roman
>>>
>>> W dniu 2017-09-12 o 00:19, Tim Ressel pisze:
>>>>
>>>> Yo,
>>>>
>>>> So I am working on SSI2144 filter designs and I can't help but notice
>>>> the polystyrene caps are biggish. Can I get away with poly film box caps?
>>>>
>>>> --tr
>>>>
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