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 Forum index » DIY Hardware and Software » YuSynth
yusynth Fixed Filter Bank
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yusynth



Joined: Nov 24, 2005
Posts: 1314
Location: France

PostPosted: Sun Dec 06, 2009 2:23 am    Post subject: Reply with quote  Mark this post and the followings unread

Congratulations !
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Yves
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kkissinger



Joined: Mar 28, 2006
Posts: 1353
Location: Kansas City, Mo USA
Audio files: 41

PostPosted: Wed Jul 28, 2010 9:52 am    Post subject: Decided to build a FFB
Subject description: It is Howard's fault
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In Kansas City last weekend Howard said, "You REALLY need a Fixed Filter Bank." Well, I have wanted to add one for a long time... Howard finally kind of shamed me into it. Smile

I just ordered more panel aluminum and included the panel for the FFB.

I've decided to build the YuSynth FFB and I think it will be a nice addition to Aries synth.

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kkissinger



Joined: Mar 28, 2006
Posts: 1353
Location: Kansas City, Mo USA
Audio files: 41

PostPosted: Tue Sep 14, 2010 7:52 pm    Post subject: A new Yusynth Fixed Filter Bank Reply with quote  Mark this post and the followings unread

I finished this just before I left for the electro-music festival and I'm just now posting the pics.

I've felt for years that the Aries needed a Fixed Filter Bank and finally it has one.


P9130006_1200.JPG
 Description:
View of the front panel. I layed out the knobs to occupy four columns to fit onto a double size (6"x9") panel.
 Filesize:  954.23 KB
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P9130006_1200.JPG



P9130008_1200.JPG
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Love those capacitors!
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P9130008_1200.JPG



P9130010_1200.JPG
 Description:
View of the etched side of the board.
 Filesize:  671.99 KB
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P9130010_1200.JPG



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yusynth



Joined: Nov 24, 2005
Posts: 1314
Location: France

PostPosted: Tue Sep 14, 2010 11:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

Well done Kev, I will add these in the FFb Gallery for sure !
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Yves
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KnobHell



Joined: Jan 28, 2012
Posts: 56
Location: SLC

PostPosted: Tue Mar 06, 2012 7:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Yves,

On your FFB webpage is a photo of the filter module built by Julien where he brings the filter output individually. Is it safe to assume that each of the filter outputs need to be buffered in the same way the combined outputs are?

len
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yusynth



Joined: Nov 24, 2005
Posts: 1314
Location: France

PostPosted: Wed Mar 07, 2012 1:31 am    Post subject: Reply with quote  Mark this post and the followings unread

It should work without buffering but it is more reasonable to buffer them.
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KnobHell



Joined: Jan 28, 2012
Posts: 56
Location: SLC

PostPosted: Wed Mar 07, 2012 6:55 am    Post subject: Reply with quote  Mark this post and the followings unread

Noted.

Yves, thank you for the great resource!

Cheers

len
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marvkaye



Joined: Mar 14, 2011
Posts: 225
Location: Fla

PostPosted: Fri Mar 09, 2012 8:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

I finished populating my FFB board earlier this week and have been working on the panel design for the last couple of days. I decided to implement some of the Dragonfly Alley mods but wanted to do something a bit different than the panel offered by Scott @ Bridechamber. The attached PDF is a plot from my CAD program that I'll use to program the CNC router to do all the drilling and engraving. I started my foray into modulars with a dotcom entry system and so am trying to stick to that format for my DIY modules as well. I thought I'd share the plot here and take this opportunity to thank Yves for a great project... so far I've enjoyed it thoroughly. Thanks for making it possible, Yves... you get my vote! Wink

<marv>


Yusynth_FFB_Panel.pdf
 Description:
The little box around the Yusynth logo will be eliminated before engraving... can't make it go away in the CAD program, but it had to be placed to make the panel official.

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 Filename:  Yusynth_FFB_Panel.pdf
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AlasdairMoons



Joined: Dec 03, 2011
Posts: 105
Location: East-Belgium

PostPosted: Tue Mar 20, 2012 4:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Mine is finished and it works perfect.
All frequencies are filtered like they should.

Thanks for this nice project

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greetings from belgium, Sascha

my DIY-blog: http://ardvinnamodular.blogspot.be
my DIY Youtube-Channel: https://www.youtube.com/channel/UCWAR64-81C3FbK_Hejz2QHw
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Don Erskine



Joined: Jun 17, 2010
Posts: 41
Location: UK

PostPosted: Fri Aug 05, 2022 1:15 pm    Post subject: YuSynth Fixed Filter Bank - design anomaly Reply with quote  Mark this post and the followings unread

I have found an anomaly in the YuSynth Fixed Filter Bank design.

Yves' design is inspired by the Moog 914 filter, which is a half-octave filter bank starting from 125Hz in half-octave steps. Thus one of the Moog bandpass filters is labelled 700Hz (should be 707.1 Hz to be more precise).

However, Yves designed a 750 Hz BP filter instead. A check of the component values confirms that this is the centre frequency of Yves' BP filter, it's not just a typo on the filter panel.

This probably explains the slight irregularities in the frequency plots around 700-750Hz in Yves' design document.

Yves' design has C21, C22, C23 and C24 as 24.2 nF, made from 22nF in parallel with 2n2.

Fc can be lowered to around 700Hz by making C21, C22, C23 and C24 = 25.5 nF. This can be simply achieved by changing C21b, C22b, C23b and C24b all from 2n2 to 3n3.

Then the filters will be a true half-octave filter bank.
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