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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
24db lowpass filter
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alieneYe



Joined: Jul 25, 2008
Posts: 38
Location: Phoenix, Az

PostPosted: Thu Dec 20, 2012 1:26 pm    Post subject: 24db lowpass filter
Subject description: resonance thins out low end
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hello there all,

i recently finished up some of my MFOS modules and been running thru tests. i've been working mainly on the 24dB LP VCF

i built in all the suggested modifications. it sounds great but i did notice one thing. with cutoff all the way open, as i increase the resonance the low end of signal seems to thin out.

anyone notice this and perhaps have any insight on what is going on? i searched the forum but found no similar issues

thanks for any info you may have
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alieneYe



Joined: Jul 25, 2008
Posts: 38
Location: Phoenix, Az

PostPosted: Thu Dec 20, 2012 3:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

i seem to have found the answer, tune the VCF cv section Smile

don't you just love when you throw a question out there and just the process of asking takes your troubleshooting ideas in a whole new direction
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El Mop



Joined: Aug 20, 2012
Posts: 54
Location: Germany

PostPosted: Sun Dec 30, 2012 4:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, love it,
but makes me feel like a retarded, too. Wink
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alieneYe



Joined: Jul 25, 2008
Posts: 38
Location: Phoenix, Az

PostPosted: Mon Apr 28, 2014 9:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

hello all

it's been a while since i posted this, but as i thought i had worked this problem out but i guess i didn't

made all the suggested "tune up" changes ray mentions and i get a nice four octaves out of the res oscillation.

it seems as the res increases the level of the output decreases. i thought it was a drop in low freq but upon lookin at it in the scope it seems to be an over all level decrease

any ideas?

thanks
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