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 Forum index » DIY Hardware and Software » Developers' Corner
One more simple VCF
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Hammer



Joined: Mar 13, 2018
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Location: Russia, Zhukovsky
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PostPosted: Fri Apr 20, 2018 2:14 am    Post subject: One more simple VCF Reply with quote  Mark this post and the followings unread

Hello!

This is just one more 4069 SVF, but with additional BP feedback, which makes it more "waspy".

Example with 561LN2, sorry for accent: https://www.youtube.com/watch?v=6Vt1AKOakLE


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State Machine
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Joined: Apr 17, 2006
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PostPosted: Sun Jul 01, 2018 9:45 am    Post subject: Reply with quote  Mark this post and the followings unread

Filer sounds good and dirty !! What is the range of CV on the FET transistors?

Bill
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Hammer



Joined: Mar 13, 2018
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PostPosted: Sun Jul 01, 2018 10:07 am    Post subject: Reply with quote  Mark this post and the followings unread

Hello, Bill!

The range of CV is between 0 and 2.5V
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State Machine
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PostPosted: Mon Jul 02, 2018 8:35 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the reply. Going to save this schematic and this information. The CV can always be scaled in other applications. Would be good to get my hands on the 561LN2 to hear a difference. For now the 4069 will suffice.
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Hammer



Joined: Mar 13, 2018
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Location: Russia, Zhukovsky
Audio files: 20

PostPosted: Mon Dec 10, 2018 1:35 pm    Post subject: Reply with quote  Mark this post and the followings unread

One more 5V single supply 4069 SVF, very musical and simple, inspired by this topic: http://www.electro-music.com/forum/topic-29678.html

Tested on breadboard.


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J-chot



Joined: Jan 20, 2014
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Location: Decatur AL

PostPosted: Mon Dec 10, 2018 8:38 pm    Post subject: Reply with quote  Mark this post and the followings unread

NICE!!!! That's REALLY warm and great sounding!!!

I[m totally going to build this when I get home from work tomorrow!

your accent is awesome!
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J-chot



Joined: Jan 20, 2014
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Location: Decatur AL

PostPosted: Mon Dec 10, 2018 8:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

What is the Drum envelope generator you're using???

oh man, how does that resonance even work?
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Hammer



Joined: Mar 13, 2018
Posts: 65
Location: Russia, Zhukovsky
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PostPosted: Tue Dec 11, 2018 12:36 am    Post subject: Reply with quote  Mark this post and the followings unread

J-chot wrote:
What is the Drum envelope generator you're using???


This one:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

J-chot wrote:
oh man, how does that resonance even work?


Are you mean the second filter?

I do not really understand why, but when you block resonance with parallel cap. in long fedback line, it's starting to resonate when you change coefficient of summing amp.
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