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 » YuSynth
Radio interferences on my EMS Filter
Post new topic   Reply to topic Moderators: Scott Stites
Page 1 of 1 [9 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
Thalassa



Joined: Jan 27, 2006
Posts: 95
Location: Spain
Audio files: 5

PostPosted: Mon Apr 20, 2009 11:42 am    Post subject: Radio interferences on my EMS Filter Reply with quote  Mark this post and the followings unread

Hello, anyone know why I have radio interferences on my EMS Filter???

Filter more or lees work nices ( resonance self oscilates, good sound ) but I can hear the radio !!!!

It's funny because even I can change station Shocked

The situation is like this :

Something patched on I1 or I2 ( doesn't matter ) , input level at 0 , andi can hear radio on the output.

Other thing is that if i move the control frequency the station changes, and is more or less louder...

I don't know what to do because I check ground, wires and nothing. If i connect any other module to the VCA I don't have interferences only with ems filter.

Anyone knows how can avoid this interferences??

Thanks

Pablo


radio.wav
 Description:
Input a 0 level, with radio on the background, after few second I turn the level knob CW and you can hear the input mixed with the radio interferences

Download
 Filename:  radio.wav
 Filesize:  2.69 MB
 Downloaded:  221 Time(s)


radio2.wav
 Description:
Just filter out patched to vca, frequency knob full CCW and after few second turn CW, at 85% you can her one big interference -> full CW and again turn CCW -> interference-> full CCW

Download
 Filename:  radio2.wav
 Filesize:  2.69 MB
 Downloaded:  176 Time(s)


_________________
http://www.corsynth.com
Back to top
View user's profile Send private message Visit poster's website
Thalassa



Joined: Jan 27, 2006
Posts: 95
Location: Spain
Audio files: 5

PostPosted: Tue Apr 21, 2009 8:02 am    Post subject: Reply with quote  Mark this post and the followings unread

any idea? no? yes? Question Question I'm so frustrated Confused Confused Confused Wink
_________________
http://www.corsynth.com
Back to top
View user's profile Send private message Visit poster's website
v-un-v
Janitor
Janitor


Joined: May 16, 2005
Posts: 8932
Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1

PostPosted: Tue Apr 21, 2009 8:53 am    Post subject: Reply with quote  Mark this post and the followings unread

Maybe someone is trying to tell you something? Wink Laughing
_________________
ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN.
Back to top
View user's profile Send private message Send e-mail
Thalassa



Joined: Jan 27, 2006
Posts: 95
Location: Spain
Audio files: 5

PostPosted: Tue Apr 21, 2009 11:42 am    Post subject: Reply with quote  Mark this post and the followings unread

maybe Laughing , it's an amazing filter and also a allow you to communicate with the spirits Idea
_________________
http://www.corsynth.com
Back to top
View user's profile Send private message Visit poster's website
v-un-v
Janitor
Janitor


Joined: May 16, 2005
Posts: 8932
Location: Birmingham, England, UK
Audio files: 11
G2 patch files: 1

PostPosted: Tue Apr 21, 2009 3:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

it's just a thought I had earlier, and I'm probably completely wrong, but one of the diodes used in the ladder, it is a germanium type is it? Perhaps the diode manufacturer mistook it for a signal type? Like a crystal radio set?! Exclamation

I love the idea that you can "tune" this filter Laughing Pwrhaps that's a clue? Shocked

_________________
ACHTUNG!
ALLES TURISTEN UND NONTEKNISCHEN LOOKENPEEPERS!
DAS KOMPUTERMASCHINE IST NICHT FÜR DER GEFINGERPOKEN UND MITTENGRABEN! ODERWISE IST EASY TO SCHNAPPEN DER SPRINGENWERK, BLOWENFUSEN UND POPPENCORKEN MIT SPITZENSPARKSEN.
IST NICHT FÜR GEWERKEN BEI DUMMKOPFEN. DER RUBBERNECKEN SIGHTSEEREN KEEPEN DAS COTTONPICKEN HÄNDER IN DAS POCKETS MUSS.
ZO RELAXEN UND WATSCHEN DER BLINKENLICHTEN.
Back to top
View user's profile Send private message Send e-mail
Adam-V



Joined: Jan 29, 2007
Posts: 300
Location: Australia
Audio files: 1

PostPosted: Tue Apr 21, 2009 3:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

Dry joints can sometimes cause audio circuits to pick up radio signals. It might be worth your while to double check every solder joint on the board and connecting wires.

Also check that the unit is earthed correctly.

Cheers,
Adam-V

_________________
Digitalis Effect | Fractured Symmetry (www.spiralsect.com)
Back to top
View user's profile Send private message Visit poster's website
Thalassa



Joined: Jan 27, 2006
Posts: 95
Location: Spain
Audio files: 5

PostPosted: Tue Apr 21, 2009 4:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for your reply, I'm feel a bit dumb but also very very happy because filter is working!!!! Very Happy

The problem was that I've varnished the pcb with an anti-corrosion spry and I didn't realize that the varnish avoid the pcb ground line to make contact with the pcb spacer that make the earth connection. Embarassed So the solution was just clean the pcb pcb corners with a bit of acetone. Embarassed .

The audio file is just a demo od the filter that I made with two synthesizers.com vco ,yusynth noise and the EMS filter with external delay and reverb.


EMS-Filter.mp3
 Description:

Download
 Filename:  EMS-Filter.mp3
 Filesize:  4.76 MB
 Downloaded:  216 Time(s)


_________________
http://www.corsynth.com
Back to top
View user's profile Send private message Visit poster's website
yusynth



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

PostPosted: Wed Apr 22, 2009 5:28 am    Post subject: Reply with quote  Mark this post and the followings unread

Wow, I have just discovered this thread and it's some amazing effect. Do you live close to a Radio Emitter ?

I would have suggested just as is said above that you used germanium diodes instead of silicon diodes... Grounding properly the cicuit solves the problem, good to know.

Cheers.

_________________
Yves

Last edited by yusynth on Tue May 12, 2009 7:46 am; edited 1 time in total
Back to top
View user's profile Send private message Visit poster's website
Thalassa



Joined: Jan 27, 2006
Posts: 95
Location: Spain
Audio files: 5

PostPosted: Wed Apr 22, 2009 7:13 am    Post subject: Reply with quote  Mark this post and the followings unread

In some way was funny because even when filter oscillates I could change the frequency moving my hands over the module without touch it, like some kind of theremin Shocked
_________________
http://www.corsynth.com
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 [9 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