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 Forum index » DIY Hardware and Software
Voltage Controlled State Variable Filter
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gabbagabi



Joined: Nov 29, 2008
Posts: 617
Location: Berlin by n8
Audio files: 23

PostPosted: Sat Feb 11, 2017 5:46 am    Post subject: Voltage Controlled State Variable Filter
Subject description: no OTA Design
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Hi,

I had this on the Breadboard yesterday.
Normally i would do more testing before posting, but there is a other thread talking about this. May it can be usefull.

Cheers BB,
gabbagabi


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J3RK



Joined: Jun 05, 2006
Posts: 123
Location: Seattle

PostPosted: Tue Feb 21, 2017 3:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

Nice! I love the simplicity there. I wonder if you can do voltage controlled resonance using a transistor as well.
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gabbagabi



Joined: Nov 29, 2008
Posts: 617
Location: Berlin by n8
Audio files: 23

PostPosted: Wed Feb 22, 2017 6:20 am    Post subject: Reply with quote  Mark this post and the followings unread

thx J3RK,
simplicity is what iam searching for,
for me this is where all the beauty and joy in the world is coming from Let us pray

i have tried this on the breadboard today, with some success.


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Sebo



Joined: Apr 27, 2007
Posts: 564
Location: Argentina

PostPosted: Sun Feb 26, 2017 7:23 am    Post subject: Reply with quote  Mark this post and the followings unread

Nice circuit, i will try it.

I think that the HP Out is missing in the second circuit...

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gabbagabi



Joined: Nov 29, 2008
Posts: 617
Location: Berlin by n8
Audio files: 23

PostPosted: Mon Feb 27, 2017 10:39 am    Post subject: Reply with quote  Mark this post and the followings unread

thx,
i guess u have to apply a offset to the resonace-part also, and play with the resistor values that are on top of the cv pots (R12 & R44)
and u can try to ommit R7 or R37

the hp output was meant symbolic like: connect the green "wires", now i see that there are two green, what a shame Smile
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L´Andratté



Joined: Sep 23, 2012
Posts: 137
Location: Hamburg, Germany
Audio files: 5

PostPosted: Sun Apr 30, 2017 3:03 am    Post subject: Reply with quote  Mark this post and the followings unread

Very nice g.gabba!
This configuration is very nice, because I´m in the back of my head thinking about a synth which can be built with garden variety components exclusivly. I think the Monotribe filter does this vc with bjts also in a SallenKey topology.
I would be very interested in a sound sample Wink
Cheers
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gabbagabi



Joined: Nov 29, 2008
Posts: 617
Location: Berlin by n8
Audio files: 23

PostPosted: Fri May 05, 2017 11:49 am    Post subject: Reply with quote  Mark this post and the followings unread

thx for the flowers,
i did soundsamples but the quality is embarassing,
they are taken from the breadboard in to the mic-in from the laptop,
there are a lot of humm&brumm

i only had that on breadboard, so no garanty for results on a proper board

cheers, gabbagabi
ps: may u like this also http://electro-music.com/forum/topic-66911.html


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gabbagabi



Joined: Nov 29, 2008
Posts: 617
Location: Berlin by n8
Audio files: 23

PostPosted: Sun May 28, 2017 1:59 am    Post subject: Reply with quote  Mark this post and the followings unread

why the the reality can not always be so nice like in simulation?

and why i dont have a real 4-Channel Tektronixxxx?


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