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 
 Forum index » DIY Hardware and Software » YuSynth
Yusynth Steiner Filter stomp box - 50Hz Hum issue
Post new topic   Reply to topic Moderators: Scott Stites
Page 1 of 1 [14 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Author Message
lebarde



Joined: Oct 03, 2017
Posts: 10
Location: Switzerland

PostPosted: Tue Feb 06, 2018 1:39 pm    Post subject: Yusynth Steiner Filter stomp box - 50Hz Hum issue Reply with quote  Mark this post and the followings unread

Hey Guys,

I've built a unit featuring two parallel Steiner filters provided by Yves.
Just tested the thing today and it sounds amazing !!
I wanted something like this for years and I so happy I did it, being able to run anything through a nice analog filter in stereo.
I know some products like this exist, but not so much actually.

I'm just having an issue having a hum noise at the usual 50Hz. It's not crazy loud but still too loud. I'm wondering if it comes from the power supply itself not being good enough, I choose something quite decent though.
Would anyone here be kind enough to help me trouble shoot that ?


20180206_132458_1517948626587_resized.jpg
 Description:
 Filesize:  2.44 MB
 Viewed:  211 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

20180206_132458_1517948626587_resized.jpg



20180206_132834_1517948635535_resized.jpg
 Description:
 Filesize:  2.98 MB
 Viewed:  188 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

20180206_132834_1517948635535_resized.jpg



20180206_132853_1517948621419_resized.jpg
 Description:
 Filesize:  1.81 MB
 Viewed:  182 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

20180206_132853_1517948621419_resized.jpg


Back to top
View user's profile Send private message
Blue Hell
Site Admin


Joined: Apr 03, 2004
Posts: 22785
Location: The Netherlands, Enschede
Audio files: 231
G2 patch files: 319

PostPosted: Tue Feb 06, 2018 4:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'd first try to move the power supply out of the box for a test to see if it is that.

Nice box BTW:-)

_________________
Jan
also .. please don't march .. we are on a bridge right now.
Back to top
View user's profile Send private message Visit poster's website
gabbagabi



Joined: Nov 29, 2008
Posts: 523
Location: will be back soon in Berlin by n8
Audio files: 23

PostPosted: Tue Feb 06, 2018 11:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

nice box!
some guys on the other side of the wormhole had recently a similar discussion
may it worth a look?
http://www.muffwiggler.com/forum/topic-194002.html&sid=90284ee924628362a5a38e6cdb270963

and of course moving the power supply out of the box would be my first test to

Last edited by gabbagabi on Thu Feb 08, 2018 2:21 am; edited 2 times in total
Back to top
View user's profile Send private message
lebarde



Joined: Oct 03, 2017
Posts: 10
Location: Switzerland

PostPosted: Wed Feb 07, 2018 4:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for your answers.
Good call trying to put the power supply out of the box.
Just tried, it does improve the issue by about 10db already.
I was keen having the DC adapter in the box though.

Cheers for the other topic link, will try what they did there and report.
Back to top
View user's profile Send private message
wackelpeter



Joined: May 05, 2013
Posts: 450
Location: germany
Audio files: 10

PostPosted: Fri Feb 09, 2018 3:07 am    Post subject: Reply with quote  Mark this post and the followings unread

For your own safety take the PSU out of the box. It's absolutely dangerous with your metallic front plate and having it not grounded with mains earth.

What i also see as very critical/crucial for your safety is that there seems to be no strain relief on the mains cable, means if you pull hard enough perhaps the mains wire get loose and come in contact with the metal case.
Also a fusing the primary side should be included.

Really, for your own safety reasons consider to re-arrange that part.

edit: okay see your using a socket for your mains... this would make the strain relief unnecessary.

_________________
https://soundcloud.com/bastian-j
Back to top
View user's profile Send private message
yusynth



Joined: Nov 24, 2005
Posts: 1314
Location: France

PostPosted: Thu Feb 15, 2018 12:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

You would also gain to use shielded wire for the audio connections (inputs and outputs and also for the connection to the rotary switch.
_________________
Yves
Back to top
View user's profile Send private message Visit poster's website
lebarde



Joined: Oct 03, 2017
Posts: 10
Location: Switzerland

PostPosted: Fri May 17, 2019 1:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hey guys,

Back here for this topic.
Took me ages to go ahead with this issue, but constantly tried to do a few tests every now and then. Thanks again for your previews messages and ideas.

As said moving the PSU out of the box wasn't miraculous.
Today, exploring some more and I was thinking that it could come from the wooden box doing some sort of antenna thing with the circuit compared to a metallic box where everything is more isolated from electro magnetism.
When I was moving the box away from the desk it was changing the level of the hum by a lot.. more than just shaking the cables around.
Finally, before putting all in a metallic box, I just put an aluminium plate under the box and wired it to the ground... bam, 100% of the hum gone !! me happy Smile
So definitely going to do that, put the aluminium plate inside under the circuits and wired to the ground.

However, I still have a problem with this filter and I'd love to have your inputs.

When I tweak the cutoff knob, I have a serious level of almost DC value.
On my spectrum analyzer the 25Hz levels goes all the way up and I hear the noise of it. It's not super clean unfortunately, and if I manage to get rid of that issue, the filter will then be a perfect peace for me to use properly and finally !

I have changed the potentiometer already because the first one was crap. It's meant to be good quality so I assume it's not from this element.
As soon as I tweak the knob by a very little, I have that super strong and inaudible low end value that goes right up.

Any help highly appreciated.
Thanks Smile
Back to top
View user's profile Send private message
gabbagabi



Joined: Nov 29, 2008
Posts: 523
Location: will be back soon in Berlin by n8
Audio files: 23

PostPosted: Sat May 18, 2019 8:14 am    Post subject: Reply with quote  Mark this post and the followings unread

may this threads are related to your problem?
http://electro-music.com/forum/topic-48989-0.html&postdays=0&postorder=asc&highlight=

http://electro-music.com/forum/topic-51644.html
Back to top
View user's profile Send private message
lebarde



Joined: Oct 03, 2017
Posts: 10
Location: Switzerland

PostPosted: Sat May 18, 2019 11:02 am    Post subject: Reply with quote  Mark this post and the followings unread

Cheers for that one.
I do have the resonance issue too and totally thought it was a bad pot.
I have a better quality one to test and I'll also try what they say there.

But my issue actually comes from the Cutoff knob... no idea if this fix will changed that too. I'll try and post results.
Back to top
View user's profile Send private message
wackelpeter



Joined: May 05, 2013
Posts: 450
Location: germany
Audio files: 10

PostPosted: Sat May 18, 2019 1:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

As far as i remember the noisy resonance pot was just an issue on the CGS Version... not that i haven't noticed it on my Yusynth Version...

I can vaguely remember having done some modifications on ym yusynth build too, but can't remember what they were… checked my printed documents, as sometimes i was clever enough to write down in them what i had done, but there were no notes About it...

But as vague as it is, i'm sure i'Ve done something to tame the resonance a bit…

Maybe i can check my module in the next days and report if i can figure out what i had done or what i haven't done.

_________________
https://soundcloud.com/bastian-j
Back to top
View user's profile Send private message
lebarde



Joined: Oct 03, 2017
Posts: 10
Location: Switzerland

PostPosted: Sat May 25, 2019 12:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

I'm just about to start trouble shooting this unit again.
But the funny thing is that the problem occurs only on one circuit out of the two.
Crackling resonance and sort of DC output levels.

It is a stereo module with 2 independent filters, just using a 2 layer pot for cutoff and resonance...

I'm a bit lost for now, but I'll get on it.
Back to top
View user's profile Send private message
lebarde



Joined: Oct 03, 2017
Posts: 10
Location: Switzerland

PostPosted: Sat May 25, 2019 12:42 pm    Post subject: Reply with quote  Mark this post and the followings unread

Pretty much all issues solved !! Very Happy

Tweaked the trimmers to a balanced position where the side effects would almost disappear and where the filter range would be nice to me.
Then changed the resonance pot to the higher quality one I recently ordered... damn, looks like I'm going to be a happy owner of a stereo version of this filter now !! Keen to close the box and go to the studio to plug it and play around.

And to summarize the issues and solutions, I'd say from my experience:

50Hz hum noise : put an aluminium plate wired to ground under the circuit, especially if you do a powered version of it. I believe this should not happen in a modular setup unless your filter goes too close to the PSU.

Crackling resonance & DC levels on the output : High quality pots needed, tweak the trimmers where it would make this side effect go away. And check the previews posts where it shows a fix for older versions of the circuit. But Yusynth version should be fine already as far as I understood.

Cheers for your help guys, highly appreciated.
Back to top
View user's profile Send private message
lebarde



Joined: Oct 03, 2017
Posts: 10
Location: Switzerland

PostPosted: Sun May 26, 2019 7:37 am    Post subject: Reply with quote  Mark this post and the followings unread

After the first session in the studio I report that I still have the 25Hz on my analyzer going nuts when I tweak the filter pot.
However, no crackling resonance, no hum... 90% good Wink

Can't identify what would give that extreme low end signal.
I was thinking about building a highpass filter to put between the filter and the output. Otherwise if you guys have any guess, I'm all keen to hear.
Back to top
View user's profile Send private message
lebarde



Joined: Oct 03, 2017
Posts: 10
Location: Switzerland

PostPosted: Sun May 26, 2019 7:37 am    Post subject: Reply with quote  Mark this post and the followings unread

After the first session in the studio I report that I still have the 25Hz on my analyzer going nuts when I tweak the filter pot.
However, no crackling resonance, no hum... 90% good Wink

Can't identify what would give that extreme low end signal.
I was thinking about building a highpass filter to put between the filter and the output. Otherwise if you guys have any guess, I'm all keen to hear.
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 [14 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