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 Forum index » DIY Hardware and Software
SUPER SIMPLE 12db RESONANT LOWPASS FILTER-with AUDIOSAMPLES!
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tokyomatik



Joined: Jan 20, 2011
Posts: 170
Location: berlin
Audio files: 6

PostPosted: Tue Jan 24, 2012 2:00 am    Post subject: SUPER SIMPLE 12db RESONANT LOWPASS FILTER-with AUDIOSAMPLES! Reply with quote  Mark this post and the followings unread

recently im abusing of this incredible filter designed by a friend of mine
is really interesting for his interaction between resonance and frequency
and the sound has his own character
can run on different voltages from 9v to 12v,
at 12v can really scream!!!
no cv controll but in combination with the sn voice module could fit without problems behind the same panel for example


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Last edited by tokyomatik on Wed Jan 25, 2012 3:27 pm; edited 2 times in total
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tokyomatik



Joined: Jan 20, 2011
Posts: 170
Location: berlin
Audio files: 6

PostPosted: Tue Jan 24, 2012 2:03 am    Post subject: Reply with quote  Mark this post and the followings unread

here also the pcb layout
ready for press n peel


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Last edited by tokyomatik on Tue Jan 24, 2012 2:05 am; edited 1 time in total
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tokyomatik



Joined: Jan 20, 2011
Posts: 170
Location: berlin
Audio files: 6

PostPosted: Tue Jan 24, 2012 2:04 am    Post subject: Reply with quote  Mark this post and the followings unread

parts placement


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kaputtpanzer



Joined: Nov 02, 2009
Posts: 62
Location: Cologne
Audio files: 2

PostPosted: Tue Jan 24, 2012 4:00 am    Post subject: Reply with quote  Mark this post and the followings unread

Ahh yes, I saw this thing a few times here. Looks very simple and interesting. I am curious how it sounds. Can someone please post an audio sample? Thanx
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vladosh



Joined: Aug 02, 2010
Posts: 445
Location: macedonia
Audio files: 6

PostPosted: Tue Jan 24, 2012 8:10 am    Post subject: Reply with quote  Mark this post and the followings unread

As this is so small parts count it'd be great to make 3 or 4 and wire them in parallel .. if i only knew how to change the range ,so one can act like bpf .. it's great for that purpose i think ,some samples would be great Smile
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tokyomatik



Joined: Jan 20, 2011
Posts: 170
Location: berlin
Audio files: 6

PostPosted: Tue Jan 24, 2012 6:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

i also was thinking about some possible mods
but im a complete beginner, so i dont know if what im thinking could really work or not
for exmple trying to split the 100k stereo log pot of the frequency with 2 mono
maybe also different values..... Embarassed ???
and another idea was to add some kind of slew with a vactrol somewhere in the path, like scott stites did with Ray Wilson's filter.....

somebody waana try??
in the while i'll make some samples
to give an idea of the character of this filter
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tokyomatik



Joined: Jan 20, 2011
Posts: 170
Location: berlin
Audio files: 6

PostPosted: Wed Jan 25, 2012 12:54 am    Post subject: Reply with quote  Mark this post and the followings unread

here some samples of a squarewave(sn voice) with different settings of resonance


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squarewave-filter seep-100%.mp3
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Dego



Joined: Apr 22, 2008
Posts: 139
Location: Sweden

PostPosted: Wed Jan 25, 2012 9:34 am    Post subject: Reply with quote  Mark this post and the followings unread

Easy to build. Might try it on veroboard. I have built my sn voice but never panelled it. Might be an easy addition to it.
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kaputtpanzer



Joined: Nov 02, 2009
Posts: 62
Location: Cologne
Audio files: 2

PostPosted: Fri Jan 27, 2012 4:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the audiosamples! Sounds very interesting, I will breadboard it later.
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BloodMaster



Joined: Jan 28, 2012
Posts: 3
Location: germany

PostPosted: Sat Jan 28, 2012 12:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

That sounds really good. Would be interested how it sounds with a more "musical phrase" and some cutoff and reso screwing.
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predok



Joined: Sep 04, 2015
Posts: 4
Location: ua

PostPosted: Mon Sep 07, 2015 1:56 am    Post subject: Reply with quote  Mark this post and the followings unread

Dual 100K pot - is it a stereo pot? I've assembled this scheme, but it works a bit strange...

Thank you for the scheme, tokyomatik!
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tokyomatik



Joined: Jan 20, 2011
Posts: 170
Location: berlin
Audio files: 6

PostPosted: Tue Sep 08, 2015 5:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

yep 100k stereo logar. the resonance interacts a lot with frequency pot,if u like it dirty & screachy i hope u will enjoy this filter. peace
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predok



Joined: Sep 04, 2015
Posts: 4
Location: ua

PostPosted: Thu Sep 10, 2015 5:15 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes, it sounds very warm and good for a low bass sound. Filter cuts high frequencies too much but anyway I like it.
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