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
  Faux Pas Quartet and friends Music From Last Thursday
Please visit the chat
 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Change from Battery to Wall Wart Power Supply (SLMS)
Post new topic   Reply to topic Moderators: dnny, Uncle Krunkus, v-un-v
Page 1 of 1 [8 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
El Mop



Joined: Aug 20, 2012
Posts: 54
Location: Germany

PostPosted: Thu Sep 06, 2012 6:04 pm    Post subject: Change from Battery to Wall Wart Power Supply (SLMS) Reply with quote  Mark this post and the followings unread

Do I have to take C16 and C18 out if I want to change from Battery to
Wall Wart Power Supply?
Are any other changes necessary?
Thx in advance.

Last edited by El Mop on Fri Sep 07, 2012 8:48 pm; edited 1 time in total
Back to top
View user's profile Send private message
Feifer



Joined: May 16, 2012
Posts: 46
Location: San Diego

PostPosted: Fri Sep 07, 2012 7:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

There's not enough information here to reply. Confused
Back to top
View user's profile Send private message
El Mop



Joined: Aug 20, 2012
Posts: 54
Location: Germany

PostPosted: Fri Sep 07, 2012 8:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

What information do you need? Question

PS: OH, I´m talking about the Sound Lab Mini Synth! Surely that is what you mean. My fault. Sorry. Embarassed
Back to top
View user's profile Send private message
Feifer



Joined: May 16, 2012
Posts: 46
Location: San Diego

PostPosted: Sat Sep 08, 2012 12:10 am    Post subject: Reply with quote  Mark this post and the followings unread

Ah, I see where it is now. Short answer is no, you don't have to take those out. In fact, a little extra rail filtering is never a bad idea. If they're already in I'd say just keep them. As far as other potential changes, are you going from 9 to 12 volts?
Back to top
View user's profile Send private message
El Mop



Joined: Aug 20, 2012
Posts: 54
Location: Germany

PostPosted: Sat Sep 08, 2012 4:36 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes, I´m going from 9 to 12V.
Back to top
View user's profile Send private message
Feifer



Joined: May 16, 2012
Posts: 46
Location: San Diego

PostPosted: Sat Sep 08, 2012 11:58 am    Post subject: Reply with quote  Mark this post and the followings unread

So it's not really necessary to change this, it'll still work just fine, but I found that going to 12V will give you too much frequency range so that a good amount of your pot will be wasted on too low to hear and too high to hear frequencies. You might want to increase R50 and R52 as well as adding a resistor to the negative side of R55 and R58. You'll have to play with them to get the range right, but it really helps when you're trying to tune it in.

I noticed a similar problem with the VCF, but now I can't remember if it gave too much or too little cutoff and res. I ended up not fiddling with it but you might want to play with the resistors on either side of those pots too.

Another change to that project that I did, and this is just personal preference and actually has nothing to do with the voltage change, is put the LFO output pot to ground instead of -V. It makes it symmetric around your preset frequency which I think is nice.
Back to top
View user's profile Send private message
El Mop



Joined: Aug 20, 2012
Posts: 54
Location: Germany

PostPosted: Sat Sep 08, 2012 1:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks.
Also for that LFO-Pot-Thing. Sounds good to me either.
I will try this.
Back to top
View user's profile Send private message
alieneYe



Joined: Jul 25, 2008
Posts: 38
Location: Phoenix, Az

PostPosted: Mon Sep 10, 2012 5:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

hey there,

i recently changed my soundlab to 12 volts. i had to add a 47K resistor to the Filter cutoff pot on the negative voltage side. without it the filter cut completely out when the pot reached about the "nine o'clock" position and had not much effect from that position to completely anti-clockwise

also had to change R56 & R59 from 1M to 1.5M to get closer to 6 octaves of tuned Oscillators
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: dnny, Uncle Krunkus, v-un-v
Page 1 of 1 [8 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 » MusicFromOuterSpace.com designs by Ray Wilson
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