[sdiy] SSI2144 filter caps

Sean Ellis TensionType at hotmail.com
Tue Sep 12 12:42:00 CEST 2017


It's worth noting the MC-202 and SH-101 use bog standard ceramic caps for their filters (C48-51)!

http://secretlifeofsynthesizers.com/wp-content/uploads/2017/02/SH101IR3109.jpg
<http://secretlifeofsynthesizers.com/wp-content/uploads/2017/02/SH101IR3109.jpg>


<http://secretlifeofsynthesizers.com/wp-content/uploads/2017/02/SH101IR3109.jpg>

I have 2 Serge Res EQs, one with styrene throughout and one with a mix of ceramic and film caps. Both sound great.



________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of ijfritz at comcast.net <ijfritz at comcast.net>
Sent: Tuesday, 12 September 2017 8:11 PM
To: Guy McCusker; SYNTH DIY
Subject: Re: [sdiy] SSI2144 filter caps

Right!  I tested C0G vs polystyrene in a hi-performance VCO some time ago and they behaved identically, as far as I could tell.  More recently, I tested both in my low-leakage S/H experiments and was able to verify leakage down into the low fA region for both types.

Ian


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------ Original Message ------

From: Guy McCusker
To: SYNTH DIY
Sent: September 12, 2017 at 2:22 AM
Subject: Re: [sdiy] SSI2144 filter caps

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
>
> 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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> Synth-diy at synth-diy.org
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