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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
Posts: 71
Location: Russia, Zhukovsky
Audio files: 23

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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Location: New York
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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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Location: Russia, Zhukovsky
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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: 23

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
Posts: 34
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
Posts: 34
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: 71
Location: Russia, Zhukovsky
Audio files: 23

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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cslammy



Joined: Apr 27, 2018
Posts: 164
Location: USA

PostPosted: Mon May 20, 2019 11:02 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi there Hammer

I created a PCB and built up your "screams wilder" Russian 4069 circuit this weekend. Used a Russian 4069UB. sounds GREAT Very Happy maybe a cross between a MS20 filter with peak cranked up and a synthacon, but gnarlier!

Keep up the good work!

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Hammer



Joined: Mar 13, 2018
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Location: Russia, Zhukovsky
Audio files: 23

PostPosted: Wed May 22, 2019 12:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

One more CMOS LPF design!

I've read the article written by people who are much smarter than me: https://ftp.unpad.ac.id/orari/orari-diklat/teknik/homebrew/filter/active-filter/docs/A%20Beginners%20Guide%20to%20Filter%20Topologies.htm

New design have much cleaner resonance and less distortions.

1. If you will remove ~1k resistors, you will have no resonance when filter is open.

2. Feedback resistor should be a little bit less 100k:

> 100K - distortions
< 100K - more resonance, lower amplification

Just find your value.

Certainly better to use 561LN2 Very Happy


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Hammer



Joined: Mar 13, 2018
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PostPosted: Wed May 22, 2019 12:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

I will remove stereo pot. with digital potentiometers and piece of Arduino - ATtiny85.

And here are some samples of previous LPF version. New version is not very different.

http://electro-music.com/forum/download.php?id=46550
http://electro-music.com/forum/download.php?id=46546
http://electro-music.com/forum/download.php?id=46545
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Hammer



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PostPosted: Sun May 26, 2019 9:22 am    Post subject: Reply with quote  Mark this post and the followings unread

And here is the newer newer version. Almost linear resonance and a loads of it. Self oscillation and so on. This version works better with CD4069 unbuffered. Low pass bypass and hipass also available.

Tested on breadboard with digital potentiometers.


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cslammy



Joined: Apr 27, 2018
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PostPosted: Sun May 26, 2019 1:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hammer wrote:


Tested on breadboard with digital potentiometers.


To change cutoff with CV use digital 100K pots and an arduino right?

I have the audio demo of the original design finished, will post it soon.

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Hammer



Joined: Mar 13, 2018
Posts: 71
Location: Russia, Zhukovsky
Audio files: 23

PostPosted: Sun May 26, 2019 2:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

cslammy wrote:
To change cutoff with CV use digital 100K pots and an arduino right?


Not exactly. I do not use CV, Arduino have simple decay envelope function and analog pot. to control decay. It's only gate signal here.

Digital 100k pots connected in series with analog 100k pots to have manual control of cutoff. Low end of one digital pot is connected to the 1/2 Vcc, it works like VCA.

I haven't decided yet, do I need fully functional ADSR, CV, or just single pot, like Korg Monotron have. Single pot also can have slow and fast attack angles.

You can hear some hiss sounds, but this is because it's builded on breadboard and use USB power right from PC without any capacitors.
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cslammy



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PostPosted: Tue May 28, 2019 6:47 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Hammer

I will breadboard when I have some time and see how I can interface with my system (0-5 or 0-8V CV control, 10V p-p audio waveforms).

Good filter to experiment with arduino controlled digital pots!

Blog post of the original circuit (which sounds good!) coming soon--it's working, demo is done.

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cslammy



Joined: Apr 27, 2018
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PostPosted: Fri May 31, 2019 8:02 am    Post subject: PCB/blog of Hammer's design Reply with quote  Mark this post and the followings unread

Hi there, with Hammer's help I fab'd a PC of his initial design, and yes, it really does scream wilder with a Russian 4069. Interesting VCF I think!

https://audiodiwhy.blogspot.com/2019/05/hammer-cocktail-low-parts-count-4069ub.html

Sound clip here:

https://soundcloud.com/cslamm/hammer

4069UB in audio (op amp? We dont need no stinking op amps!)

https://audiodiwhy.blogspot.com/2019/05/a-rolling-stone-gathers-no-cmos-4069ub.html

Thanks to Hammer for help with this project and post! He's continually updating and I may fab a Eurorack version down the road.

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Hammer



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PostPosted: Fri May 31, 2019 8:27 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you a lot!
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