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
  Jez Adventures in Sound
Please visit the chat
 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Sonic Multiplier
Post new topic   Reply to topic Moderators: dnny, Uncle Krunkus, v-un-v
Page 1 of 1 [10 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
fredw



Joined: Jul 08, 2007
Posts: 9
Location: Berkeley, CA

PostPosted: Sun Jan 25, 2009 1:46 pm    Post subject: Sonic Multiplier
Subject description: Sine wave oscillator doesn't work yet
Reply with quote  Mark this post and the followings unread

I've build the Sonic Multiplier (ring modulator) kit. The sine wave oscillator doesn't work yet. The control voltage inputs (fine and coarse) from the front panel work, but no oscillation. I've inspected the board carefully, and double-checked all part values. I'm not sure how to troubleshoot an oscillator. It's a stage variable filter that's supposed to oscillate. Anybody have any ideas how to troubleshoot this?

Thanks much!
Back to top
View user's profile Send private message
RF



Joined: Mar 23, 2007
Posts: 1493
Location: Northern Minnesota, USA
Audio files: 28

PostPosted: Sun Jan 25, 2009 1:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ray has a note on the schematic about changing R46 if you are using 15 Volts...
http://www.musicfromouterspace.com/analogsynth/RINGMODULATOROCT2007/RINGMODULATOROCT2007.html

So - um --ARE you using 15 volts 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
fredw



Joined: Jul 08, 2007
Posts: 9
Location: Berkeley, CA

PostPosted: Sun Jan 25, 2009 2:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

[quote="RF"]Ray has a note on the schematic about changing R46 if you are using 15 Volts...

Wow that worked! Thanks much for the quick and correct reply! I changed it to 47k and now it oscillates. The output is a trapazoid instead of a sine. I put a 100k pot there instead and now I can vary the shape until it's a nice looking sine wave.

Thanks again, Fred.
Back to top
View user's profile Send private message
Skrog Productions



Joined: Jan 07, 2009
Posts: 782
Location: Scottish Borders
Audio files: 87

PostPosted: Mon Jan 26, 2009 10:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi, i use 12v +/- and had the same problem, i hooked up to my scope and the output of the sine was very low, i first thought it might need more gain but it was the filter needing kickstarted into self ocsillation, had me stumped for a couple of hours, works fine now.
_________________
www.myspace.com/skrogproductions
Back to top
View user's profile Send private message
tommi



Joined: Dec 05, 2007
Posts: 247
Location: Italy
Audio files: 3

PostPosted: Sat Jun 13, 2009 2:35 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi,
I am testing the Sonic Multiplier that I have built tonight.
Both the two preamp sections and ring modulation section are working.
I got no internal sine. Listening from the sine out all I can hear is a tiny sound just wich seems a filter when resonance is turned just before starting self oscillating..
I am running on +/-12V and I checked all resistor values...
Any suggestion?
tommi

_________________
http://soundcloud.com/mister-vommi
http://tideofsound.net
Back to top
View user's profile Send private message
tommi



Joined: Dec 05, 2007
Posts: 247
Location: Italy
Audio files: 3

PostPosted: Sat Jun 13, 2009 2:53 am    Post subject: Reply with quote  Mark this post and the followings unread

I just find a solution, I lowered R46 to 100K and now the sine is whistling!
_________________
http://soundcloud.com/mister-vommi
http://tideofsound.net
Back to top
View user's profile Send private message
Captain Biscuits



Joined: Jun 11, 2010
Posts: 112
Location: Northampton, UK

PostPosted: Fri Mar 18, 2011 4:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for that Tommi. I've just finished my ring mod and all was fine except for the sine wave output. Just changed R46 to 100K and it's working perfectly.

I was slightly puzzled when I came to adjust the trim pot. I couldn't detect any bleed through at all. Turned out it just happened to be adjusted perfectly before I started fiddling with it.

Nice, once again, to have a problem, search electro-music and find a solution within minutes.

Much appreciated!

Cheers

Ian
Back to top
View user's profile Send private message
littlem4tt



Joined: Jun 30, 2013
Posts: 40
Location: uk

PostPosted: Sun Jul 07, 2013 2:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

omg i have been struggling with this for ages. I even built it on breadboard a few times. I cant wait to try this mod.
Back to top
View user's profile Send private message
littlem4tt



Joined: Jun 30, 2013
Posts: 40
Location: uk

PostPosted: Mon Jul 08, 2013 6:00 pm    Post subject:   Reply with quote  Mark this post and the followings unread

So the moment came to replace r46 to 100k connect the scope turn on and...

whoooooop! lovely 8v p/p sine wave!!!

you guys are the best!!


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



Joined: Nov 15, 2013
Posts: 1
Location: ohio

PostPosted: Fri Nov 15, 2013 1:20 am    Post subject: Reply with quote  Mark this post and the followings unread

I lowered the resistor value of R46 to 50k for a wider frequency range. I Hope I don't learn to regret it.
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 [10 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