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 Forum index » DIY Hardware and Software » Ken Stone designs - CGS
bi-n-tic vcf (solved)
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vladosh



Joined: Aug 02, 2010
Posts: 491
Location: macedonia
Audio files: 12

PostPosted: Fri Jan 05, 2018 10:39 am    Post subject: bi-n-tic vcf (solved) Reply with quote  Mark this post and the followings unread

hi all , i just finished a bi-n-tic filter and the vco part is not working ,i browsed around the forum for any answers on cgs vco or this ,to try and get it working and i don't know what to try and do , i use matched BCM847 and J201 for fat, had one pot(fine) non working so i just removed it ,other then that i can't figure it out ,any help would be great ! thanks
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Last edited by vladosh on Fri Jan 05, 2018 2:06 pm; edited 1 time in total
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vladosh



Joined: Aug 02, 2010
Posts: 491
Location: macedonia
Audio files: 12

PostPosted: Fri Jan 05, 2018 11:31 am    Post subject: Reply with quote  Mark this post and the followings unread

i replaced the 2.2n cap with a better one ,now i get some response in the cv input but on the freq pot i get only this little "pluck" sound at some position while turning it
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vladosh



Joined: Aug 02, 2010
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PostPosted: Fri Jan 05, 2018 2:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

i replaced the J201 with BF246 and it's working! , this thing is wild Laughing
cheers

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g.gabba



Joined: Nov 29, 2008
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Location: berlin
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PostPosted: Sat Jan 06, 2018 12:57 am    Post subject: Reply with quote  Mark this post and the followings unread

congrats!
would love to hear some sound.
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vladosh



Joined: Aug 02, 2010
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PostPosted: Sat Jan 06, 2018 6:34 am    Post subject: Reply with quote  Mark this post and the followings unread

the synth is not connected to the comp ,need to find adapter for the mic input so i could record ,anyways it's interesting module ,little hard to control but fun anyway
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mike page



Joined: Sep 26, 2016
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Location: norwich, uk

PostPosted: Sat Jun 02, 2018 8:10 am    Post subject: Reply with quote  Mark this post and the followings unread

I really dont understand this filter! If all the capacitors are the same value how does switching between them alter anything?
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