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VCF with OTA - but how to add resonance?
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alkopop79



Joined: Aug 21, 2008
Posts: 49
Location: London

PostPosted: Mon May 27, 2013 1:29 pm    Post subject: VCF with OTA - but how to add resonance? Reply with quote  Mark this post and the followings unread

This circuit is from the LM13700 datasheet. I wonder how can I add resonance network? I reads that some filters add a bandpass filter in the reso and some sport an op amp buffer. Where and how should I add the reso?


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jackdamery



Joined: Apr 26, 2010
Posts: 75
Location: UK

PostPosted: Mon May 27, 2013 2:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Check Ray Wilson's new book, he copied the datasheet schematic and added resonance, as well as making it more suitable for synth purposes.
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alkopop79



Joined: Aug 21, 2008
Posts: 49
Location: London

PostPosted: Tue May 28, 2013 7:07 am    Post subject: Reply with quote  Mark this post and the followings unread

JackDamery again! Hey:) Thanks!
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alkopop79



Joined: Aug 21, 2008
Posts: 49
Location: London

PostPosted: Tue May 28, 2013 7:09 am    Post subject: Reply with quote  Mark this post and the followings unread

The book is on the way, already ordered it.
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jackdamery



Joined: Apr 26, 2010
Posts: 75
Location: UK

PostPosted: Wed May 29, 2013 5:01 am    Post subject: Reply with quote  Mark this post and the followings unread

Check this post too. http://electro-music.com/forum/topic-45231.html

I'm gonna see if I can breadboard it tonight with half a TL072.
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