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
  mosc Live music with Twyndyllyngs - Bill Fox and Howard Moscovitz
Please visit the chat
 Forum index » DIY Hardware and Software » YuSynth
Problems with my Steiner VCF (CA3096)
Post new topic   Reply to topic Moderators: Scott Stites
Page 1 of 1 [5 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
Aottens



Joined: Mar 14, 2010
Posts: 24
Location: The Netherlands

PostPosted: Mon Feb 13, 2012 7:52 am    Post subject: Problems with my Steiner VCF (CA3096)
Subject description: Some problems I need solved.
Reply with quote  Mark this post and the followings unread

Hello, I've built the filter, but there are some problems with it. And I don't really know how to solve them.

I've checked the connections and the parts, and everything seems fine.

1. De cutoff frequency potentiometer is not really working. It doesn't seem to work on either position (LP HP BP AP)

2. The output level of HP and BP are really low

3. If I adjust the control level (cutoff freq), nothing happens.

4. When I turn the resonance potentiometer, the only thing I hear are some crackling sounds. Do I need a new potentiometer for this? If the answer is yes, please give me a link with the right one I can buy!

What can I check, and are there some measurements I can perform?

Thanks for the help!
Back to top
View user's profile Send private message
kkissinger



Joined: Mar 28, 2006
Posts: 1214
Location: Kansas City, Mo USA
Audio files: 29

PostPosted: Mon Feb 13, 2012 2:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've built many Yusynth modules, including the Steiner VCF and every problem I had was due to cold solder joints.

For starters, check every connection for continuity with a volt-ohm meter. I know this sounds tedious, but in the long run it is the quickest way to find problems. Pay special attention to Diodes -- cold or weak solder joints are almost impossible to see.

You can check this with your continuity tester by placing one test probe on a trace and the other on the leads to the parts -- in other words, one probe on the trace side of the board and the other on the corresponding leads. (of course, do this when your module is disconnected from the power supply).

_________________
-- Kevin
http://kevinkissinger.com
Back to top
View user's profile Send private message Visit poster's website
ungleichklang



Joined: Dec 03, 2011
Posts: 82
Location: East-Belgium

PostPosted: Mon Feb 13, 2012 3:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

kkissinger wrote:
..... every problem I had was due to cold solder joints.
............
You can check this with your continuity tester by placing one test probe on a trace and the other on the leads to the parts


This hint is sooo valuable - lot of work, but worth it Wink

_________________
greetings from belgium, Sascha

My new blogspot: http://ungleichklang.blogspot.com
My Youtube-Channel: http://www.youtube.com/user/ungleichklang


Linux Musician
Back to top
View user's profile Send private message Visit poster's website
kkissinger



Joined: Mar 28, 2006
Posts: 1214
Location: Kansas City, Mo USA
Audio files: 29

PostPosted: Mon Feb 13, 2012 4:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

Fortunately the Steiner VCF has few parts and the PCB is not too dense. Shouldn't take more than 30 minutes to check everything.

Also, when nothing seems to work -- the first thing I check is the power supply. Make sure that the +, -, and GND connections are secure (and that the polarity is correct). Check continuity along the traces -- a microscopic break in a trace is all it takes to make an open circuit. Check the polarity on the parts.

In my case, I etched my own PCBs and, since the traces are not tinned, it is a little harder to solder than commercially-made PCBs that have nice tinned connections.

Most importantly, don't give up. Just take a deep breath, check everything, and keep looking until you find something (a broken trace, cold solder joint, or reverse polarity).

The Yusynth Steiner VCF is a wonderful filter -- well worth the effort.

_________________
-- Kevin
http://kevinkissinger.com
Back to top
View user's profile Send private message Visit poster's website
Aottens



Joined: Mar 14, 2010
Posts: 24
Location: The Netherlands

PostPosted: Tue Feb 14, 2012 1:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the reply's guys! Much appreciated! I will check the solder joints when I get home from work today. Also I'm going to check the polarities.

I will come back at you if it works Wink and also if it doesn't.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic Moderators: Scott Stites
Page 1 of 1 [5 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