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 
 Forum index » DIY Hardware and Software
martenot-style string synth
Post new topic   Reply to topic Moderators: jksuperstar, Scott Stites, Uncle Krunkus
Page 1 of 1 [2 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
choklitlove



Joined: Dec 23, 2005
Posts: 144
Location: Indiana
Audio files: 17

PostPosted: Sat Dec 24, 2005 10:19 am    Post subject: martenot-style string synth Reply with quote  Mark this post and the followings unread

i don't really know what i'm asking. i'd really like to figure out the secrets of the martenot. i googled it, and just found some history like these-
http://www.peterpringle.com/ondes.html
http://csunix1.lvc.edu/~snyder/em/mart.html
Posted Image, might have been reduced in size. Click Image to view fullscreen.


then i searched the forums here and found this- http://electro-music.com/forum/viewtopic.php?highlight=martenot&t=7710
which is getting closer to what i want to know. but it seems that thread is very old and no one wants to talk in it anymore.
Posted Image, might have been reduced in size. Click Image to view fullscreen.

basically, i'm just interested how it uses a string of some sort to move side-to -side to change pitch, create vibrato, portamento, etc.

any more info on the inner-workings?
Back to top
View user's profile Send private message
Uncle Krunkus
Moderator


Joined: Jul 11, 2005
Posts: 4760
Location: Sydney, Australia
Audio files: 52
G2 patch files: 1

PostPosted: Mon Dec 26, 2005 5:15 am    Post subject: Reply with quote  Mark this post and the followings unread

The idea is similar to the way old radios moved a needle up and down a graph of frequencies. At the same time a variable cap of some sort was being turned, and it was driven by someone's thumb on a wheel. A piece of string (with a tension spring in line) joined them all together. Now if you replace the cap with a variable resistor and drive that by moving the string in a linear fashion, that's a martenot.
The picture you posted is almost right (I remember seeing this picture somewhere before), but the string needs to be in a continous loop, ie: - it returns to the other bobbin on the other side. Like this: -
______
(o)_____(o)

It goes around each bobbin say 2 or 3 times. The tension spring stops it from going slack. Under each bobbin I would put a pot. How you wire them is up to you.
The trick is to take this basic mechanism and refine it so that you get the maximum linear travel, and a certain amount of accuracy which will make it more "playable".
Hope this helps.
Andrew

_________________
What makes a space ours, is what we put there, and what we do there.
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 [2 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