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
CV voltage offset circuit
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
allochthon



Joined: Aug 20, 2014
Posts: 1
Location: United States

PostPosted: Wed Aug 20, 2014 4:06 pm    Post subject: CV voltage offset circuit Reply with quote  Mark this post and the followings unread

I am attempting to offset a CV voltage being sent from a MIDI-to-CV converter to an analog synth. I need the voltage to increase 0.58V consistently for every note value (e.i., voltage).

There's a six year old post on this forum HERE. Since it's so old, I thought I'd refresh the topic.

I built this circuit (almost - I used a TL082 and a slightly different cap value) and it I am able to adjust the a 0V source to 0.58V. However, if I change the input voltage, the resulting output voltage does not change. Well, it does to a very small extent over many octave ranges, but nothing like it should (e.g., follow a sequenced pattern).

Can this circuit do what I'm trying to do, or am I barking up the wrong tree? I'm not an electronics whiz by a long shot, so I may be missing something fundamental.

I am assuming that the commercial versions of this device like the A-183-2 and the Q125 are designed for this very function. Please correct me if I am wrong.. on any of this.

Next I'll try building the circuit that Doepfer has on their DIY page - see #3. Fingers crossed.

Cheers.
Back to top
View user's profile Send private message
Blue Hell
Site Admin


Joined: Apr 03, 2004
Posts: 20518
Location: The Netherlands, Enschede
Audio files: 147
G2 patch files: 318

PostPosted: Wed Aug 20, 2014 5:16 pm    Post subject: Re: CV voltage offset circuit Reply with quote  Mark this post and the followings unread

allochthon wrote:
Can this circuit do what I'm trying to do, or am I barking up the wrong tree?


Yes, should do the trick ... the gain pot should be set about midway, but it needs fiddling to get it exact.

Oh, and welcome

_________________
Jan
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