electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Articles  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links  |  Store
Forum with support of Syndicator RSS
 FAQFAQ   CalendarCalendar   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   LinksLinks
 RegisterRegister   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in  Chat RoomChat Room 
Live streaming at radio.electro-music.com

  host / artist show at your time
  PHOBoS presents Sim Biosys (EM mix)
  PHOBoS Tales of the Golden Teacher
  PHOBoS presents Music by Hrastprogrammer (feat. Terence McKenna)
  Faux Pas Quartet and friends Music From Last Thursday
Please visit the chat
 Forum index » DIY Hardware and Software
VCF with OTA - but how to add resonance?
Post new topic   Reply to topic Moderators: jksuperstar, Scott Stites, Uncle Krunkus
Page 1 of 1 [5 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
alkopop79



Joined: Aug 21, 2008
Posts: 44
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?


VCF.jpg
 Description:
 Filesize:  40.73 KB
 Viewed:  45 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

VCF.jpg


Back to top
View user's profile Send private message
jackdamery



Joined: Apr 26, 2010
Posts: 72
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.
Back to top
View user's profile Send private message
alkopop79



Joined: Aug 21, 2008
Posts: 44
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!
Back to top
View user's profile Send private message
alkopop79



Joined: Aug 21, 2008
Posts: 44
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.
Back to top
View user's profile Send private message
jackdamery



Joined: Apr 26, 2010
Posts: 72
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.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: jksuperstar, Scott Stites, Uncle Krunkus
Page 1 of 1 [5 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
 Forum index » DIY Hardware and Software
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
e-m mkii

Please support our site. If you click through and buy from
our affiliate partners, we earn a small commission.


Forum with support of Syndicator RSS
Powered by phpBB © 2001, 2005 phpBB Group
Copyright © 2003 through 2009 by electro-music.com - Conditions Of Use