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
  EdisonRex Edison's Electronic Review
Please visit the chat
 Forum index » DIY Hardware and Software
A 1 to 10 pole moog ladder?
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
zipzap



Joined: Nov 22, 2005
Posts: 559
Location: germany
Audio files: 24

PostPosted: Tue Jan 10, 2006 1:04 pm    Post subject: A 1 to 10 pole moog ladder?
Subject description: just an idea
Reply with quote  Mark this post and the followings unread

Once i build this famous 24db moog ladder filter. The one with the ladder formed by 4 cabs and 10 transistors. I was using ic holders(?) because i was afraid to cook my transistors. Well, while inserting them i noticed that the sound changed with each transistor i put in while listening to the output. I guess that every c forms a 1 pole filter.
Now, wouldn´t it be pissible to build a big ladder with many stairs and some sort of swiching circuit that controlls which transistors are active? than you could have a big rotary swich going from 1 pole over 3 pole tb303, classic 4 pole, Virus 6 pole to whatever you want. possible? reasonable?
What do you think?


moog.jpg
 Description:
 Filesize:  40.17 KB
 Viewed:  2705 Time(s)

moog.jpg


Back to top
View user's profile Send private message
ian-s



Joined: Apr 01, 2004
Posts: 2585
Location: Auckland, New Zealand
Audio files: 42
G2 patch files: 612

PostPosted: Tue Jan 10, 2006 1:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

Like this one?
The difference between 2,3,4 poles is pretty subtle but switch positions are cheep.

Posted Image, might have been reduced in size. Click Image to view fullscreen.
Back to top
View user's profile Send private message
zipzap



Joined: Nov 22, 2005
Posts: 559
Location: germany
Audio files: 24

PostPosted: Tue Jan 10, 2006 1:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

any idea how it is done? is it realy just the cascade thing, basically swithing the same filter after another?
Back to top
View user's profile Send private message
ian-s



Joined: Apr 01, 2004
Posts: 2585
Location: Auckland, New Zealand
Audio files: 42
G2 patch files: 612

PostPosted: Tue Jan 10, 2006 4:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

zipzap wrote:
any idea how it is done? is it realy just the cascade thing, basically swithing the same filter after another?


I saw something on the Synth DIY list, not very specific but the idea is to keep the resonance path on the final stage and just shift the tap points for the main differential output amp down the ladder, so a two pole switch should work.
Back to top
View user's profile Send private message
yusynth



Joined: Nov 24, 2005
Posts: 1234
Location: France

PostPosted: Wed Jan 11, 2006 8:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi

Well the trick is as g2ian says. A very good example of this is Tony Algood's super ladder filter :

http://www.physicsenterprises.andrews.edu/diy_archive/schematics/oakley/super.html

_________________
Yves
Back to top
View user's profile Send private message Visit poster's website
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