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
<on air> 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
My MFOS Soundlab
Post new topic   Reply to topic Moderators: dnny, Uncle Krunkus, v-un-v
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
th0mas



Joined: Feb 27, 2010
Posts: 12
Location: Ottawa

PostPosted: Tue Dec 14, 2010 11:28 am    Post subject: My MFOS Soundlab
Subject description: some pics, questions
Reply with quote  Mark this post and the followings unread

Here's some pics of my MFOS soundlab. Sorry for the blurry pics, cell phone camera, the usual..

Posted Image, might have been reduced in size. Click Image to view fullscreen.
Posted Image, might have been reduced in size. Click Image to view fullscreen.

AND the obligatory "holy rats nest" pic:
Posted Image, might have been reduced in size. Click Image to view fullscreen.

Problems I'm dealing with:

It's kind of hard to read but there's a "sub" pot in the mixer section. My plan was to take the squarewave output of VCO2, feed it to a 4024 binary counter to generate sub octaves (schematic). It, uh, doesn't work. I'm guessing the 4024 doesn't like my squarewave that goes -ve? I'm waiting on new oscillator probes to be shipped and hopefully I can track down the issue once they arrive.

The other issue seems tied together. My LFO doesn't seem to generate squarewaves although ramp/saw works, but at the LFO frequency it shorts the noise output. Hard to explain. There's been a few other posts on the forum about noise output being influenced by VCO2, this seems to be similar. I'm guessing it may have to do with the fact that I made my own panel wiring since my panel is obviously not the same as the stock Ray Wilson one.

Regardless most of the synth works and plays great. I'll record some demos. I have a MIDI->CV converter so it's pretty fun to play.

Oh and I missed the LFO and ENV modulations of the VCA on my panel so they're unlabelled. Doh!
Back to top
View user's profile Send private message Visit poster's website
RF



Joined: Mar 23, 2007
Posts: 1490
Location: Northern Minnesota, USA
Audio files: 28

PostPosted: Tue Dec 14, 2010 12:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

That looks very nice - congrats on the nice build.
I've seen worse rats nests Smile

bruce

_________________
www.sdiy.org/rfeng

"I want to make these sounds that go wooo-wooo-ah-woo-woo.”
(Herb Deutsch to Bob Moog ~1963)
Back to top
View user's profile Send private message
frotje



Joined: Feb 26, 2008
Posts: 18
Location: Netherlands - Nuenen
Audio files: 5

PostPosted: Wed Dec 15, 2010 2:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

nice synth spagetti !
Back to top
View user's profile Send private message
th0mas



Joined: Feb 27, 2010
Posts: 12
Location: Ottawa

PostPosted: Thu Dec 16, 2010 8:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

I think I figured out one of my problems (LFO does not output squarewave)

Using my oscilloscope I found that while the ramp signal is going to the non-inverting op-amp IC7-B, that op-amp is outputting absolutely nothing.

Bad LM444 I guess? I had another problem which was my noise circuit was intermittent at the same rate as the LFO, so I'm thinking the comparator opamp in IC7 for noise was also bad. I'm hoping anyways.

I've desoldered it (note to self: not socketing chips was a good idea until something went wrong :/ ) and await a replacement.

_________________
-=facebook-twitter-soundcloud-blog=-
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: dnny, Uncle Krunkus, v-un-v
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 » 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
mps board

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