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 » YuSynth
VCO question?
Post new topic   Reply to topic Moderators: Scott Stites
Page 1 of 1 [6 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
Ali M



Joined: Sep 01, 2009
Posts: 88
Location: uk

PostPosted: Sun Sep 27, 2009 8:39 am    Post subject: VCO question? Reply with quote  Mark this post and the followings unread

What is the range of the yusynth VCO frequency pot?
Would it go low enough to act like an LFO? And high enough for dogs to go mad?? Twisted Evil
Back to top
View user's profile Send private message
yusynth



Joined: Nov 24, 2005
Posts: 1219
Location: France

PostPosted: Mon Sep 28, 2009 2:34 am    Post subject: Reply with quote  Mark this post and the followings unread

If you use the good components and trim up the circuit as described on the VCO page of the yusynth.net site, the lowest value for the frequency pot is 16 Hz and the maximum value is 36 kHz.

It can be trimmed to lower values : around 2 Hz for the lower limit but 4.5 kHz for the upper limit .

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



Joined: Sep 01, 2009
Posts: 88
Location: uk

PostPosted: Mon Sep 28, 2009 3:02 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Yves,
In doing that would it decrease the accuracy of the tuning?
thanks
Back to top
View user's profile Send private message
yusynth



Joined: Nov 24, 2005
Posts: 1219
Location: France

PostPosted: Mon Sep 28, 2009 4:55 am    Post subject: Reply with quote  Mark this post and the followings unread

No it would not.
_________________
Yves
Back to top
View user's profile Send private message Visit poster's website
Ali M



Joined: Sep 01, 2009
Posts: 88
Location: uk

PostPosted: Tue Nov 03, 2009 1:15 am    Post subject: Reply with quote  Mark this post and the followings unread

I have another couple of questions about the VCO,

R23, why might it have to be replaced by an 82K resistor?

Does the Tempco have to be soldered directly to the SM2210? can it be soldered to the empty holes next to it? or does this mess with the temp sensing?

Im just a bit worried about frying my lovely SM!

thanks
Back to top
View user's profile Send private message
yusynth



Joined: Nov 24, 2005
Posts: 1219
Location: France

PostPosted: Tue Nov 03, 2009 1:26 am    Post subject: Reply with quote  Mark this post and the followings unread

Ali M wrote:

R23, why might it have to be replaced by an 82K resistor?

This may be needed to have the right sawtooth output level , it is important to obtain a good sinewave. The difference between 82K and 100K is to modulate the gain of U6a in order to compensate for the difference in current characteristics of the various brand of dual transistor ICs (LM394,2SC1583 or SSM2210 or even hand matched BC547). I would suggest that you use 100K first and if you cannot get a good sinewave (too triaangular for example) then replace it by a 82K.

Ali M wrote:
Does the Tempco have to be soldered directly to the SM2210? can it be soldered to the empty holes next to it? or does this mess with the temp sensing?
Im just a bit worried about frying my lovely SM!

No it does not need to be soldered directly and the two empty holes next to the SSM2210 were there in purpose to allow using these instead.

_________________
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: Scott Stites
Page 1 of 1 [6 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 » YuSynth
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