electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links
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
Envelope Generator CV output? 0-5V? 0-10V? 0-?
Post new topic   Reply to topic Moderators: jksuperstar, Scott Stites, Uncle Krunkus
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
mikeb



Joined: Nov 20, 2006
Posts: 59
Location: The Automotive Capital of Canada

PostPosted: Mon Nov 04, 2019 7:51 pm    Post subject: Envelope Generator CV output? 0-5V? 0-10V? 0-? Reply with quote  Mark this post and the followings unread

Building a very small euro EG and I'm wondering what everyone is used to their EG's outputting. I have some old stuff that outputs 0-10V and a lot of new stuff outputs 0-5V.

Any preferences here?
Back to top
View user's profile Send private message
gabbagabi



Joined: Nov 29, 2008
Posts: 651
Location: Berlin by n8
Audio files: 23

PostPosted: Wed Nov 06, 2019 10:55 am    Post subject: Reply with quote  Mark this post and the followings unread

one could say more=better, more amplitude gives u more opportunities

e.g. if your vca is only reaching unity gain at 7V, u would never reach unity gain with a 5V envelope

if your VCA is reaching unity gain at 5V, u could overdrive him with a 7V envelope and archive some wanted distortion to enrich the archiveable sound spectrum
Back to top
View user's profile Send private message
Ricko



Joined: Dec 25, 2007
Posts: 251
Location: Sydney, Australia
Audio files: 27

PostPosted: Wed Nov 06, 2019 3:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

Every diffrrent VCA differs in what input CV produces unity gain. What is more standardized are the EG levels. Provide a pot on the VCA.

The appropriate level depends on the format of the module. (A worthwhile rule-of-thumb might be you want to be able to mix two signals together and not be over the supply rails: so this means 6V max for Eurorack and 7.5V max for the larger 15V systems. But it is more important to follow the original published specs for the format.)

If it is for large format like Dotcom, then control voltages are from 0 to 10V. Ditto Roland system 700 and System 100m.

Moog modular's 902 maximum VCA level comes with 6V input, if that helps.

If it is for Eurorack, then follow the numbers in Doepfer's specification, which is 7V for EG. 5V is just too little. (If you are doing a dynamic envelope, the upper limit shouldnt be much more than about 7V. And never over 10V. )

(The reason some people generate 5V or 3.3V is, I think, because of the entirely slack reason that this is the power supply of their digital circuits. They want to have shallow modules to fit some bizzarely shallow skiff, so they need to skimp on components like buffers.)

In general, an EG can err on the side of too loud rather than too soft, because so many VCA have a level pot built in. And a Eurorack VCA should be capable of 2x output, because so many slack/lazy/harried people choose to adopt VCO circuits from other formats without correcting the signal level.
Back to top
View user's profile Send private message Visit poster's website
Cynosure
Site Admin


Joined: Dec 11, 2010
Posts: 966
Location: Toronto, Ontario - Canada
Audio files: 82

PostPosted: Sun Nov 10, 2019 9:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Ricko wrote:
If it is for Eurorack, then follow the numbers in Doepfer's specification, which is 7V for EG.


It says 0 to +8V for Eurorack: http://www.doepfer.de/a100_man/a100t_e.htm

If created digitally at 5V, then just use an amplifying buffer on the output.

_________________
JacobWatters.com
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 [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
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


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