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
  Twyndyllyngs Special Monday edition of Chez Mosc
Please visit the chat
 Forum index » DIY Hardware and Software » Developers' Corner
Patch Cords customized for more functionality
Post new topic   Reply to topic Moderators: DrJustice
Page 1 of 1 [4 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
bryan



Joined: May 28, 2008
Posts: 8
Location: some furniture

PostPosted: Fri May 30, 2008 12:18 pm    Post subject: Patch Cords customized for more functionality
Subject description: passive attenuation, inversion, filtering, ???..
Reply with quote  Mark this post and the followings unread

I need some advice, please.

What passive functions would be feasible for installing on patch cords? This would save rack space and reduce the time it takes to set up patches.

For example (on a eurorack-format modular), is there a good pot that would hold up well and not get in the way when attached to a patch cord? Would an inverting cord be as simple as crossing the +/- wires? What are some ways to get passive filtering and appropriate resistor values? What other things can be done in this vein?

Maybe an even better way to do this would be to use a little custom adapter that you can plug into on the end of a patch cord.

Possibilities, advice and pros/cons about doing this type of thing would be much appreciated.
Back to top
View user's profile Send private message
DrJustice



Joined: Sep 13, 2004
Posts: 2041
Location: Morokulien
Audio files: 3

PostPosted: Fri May 30, 2008 4:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

As you suggest yourself, a pot connected as a voltage divider is a nice attenuator. With a bit of shrink tubing to isolate the pot and secure the wires it ought to stand up to normal use.

Simply crossing the wires is probably not too useful as it would cause signal outputs to be shorted to ground, and ground used a a signal. Using Y-cables (or cables that split into more branches) is usually OK, both for mixing (check with your particular modules!) and for splitting.

Passive filtering is indeed possible. The simplest one would be a 1st order RC filter (a nice little ecalculator here).

A capacitor in series will work as a DC blocker. A diode in series is a half wave rectifier, or use a diode bridge for a fullwave rectifier.

Hmm.. there has to be more...

DJ
--
Back to top
View user's profile Send private message Visit poster's website
elektro80
Site Admin


Joined: Mar 25, 2003
Posts: 21977
Location: Norway
Audio files: 14

PostPosted: Fri May 30, 2008 4:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

Good advice, but I kinda wonder why you feel you need to move signal processing to the patch cables. Attenuating a signal is signal processing in the modular world. If there is something specific you need then simply stripboard it and hook it up to a panel?
_________________
A Charity Pantomime in aid of Paranoid Schizophrenics descended into chaos yesterday when someone shouted, "He's behind you!"

MySpace
SoundCloud
Flickr
Back to top
View user's profile Send private message Visit poster's website
bryan



Joined: May 28, 2008
Posts: 8
Location: some furniture

PostPosted: Fri May 30, 2008 8:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

DJ, thanks much that certainly helps me out.

elektro80, good question. In my case it's for 2 purposes: to conserve space in a compact system, and for live performance - it would be faster to have some dedicated utility cords rather than having to do a separate patch.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: DrJustice
Page 1 of 1 [4 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 » Developers' Corner
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