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 Forum index » DIY Hardware and Software » YuSynth
YUSYNTH EMS-diode ladder filter
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Sebo



Joined: Apr 27, 2007
Posts: 534
Location: Argentina

PostPosted: Sat May 29, 2010 12:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Yves:
I was aware of the input level and I did the test with the input at mark 4,
also I measured with my PC oscilloscope the point at the input starts to
overdrive, and it was at mark 4 indeed.
Now I tryed lowering the input level and the unestability goes away with
the input below mark 2. The output level is low, but the filter sounds great.
The self oscillation still dissapearing at 9KHz.
Thanks a lot for your help.

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kkissinger



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

PostPosted: Mon Jan 17, 2011 3:41 pm    Post subject: Another diode ladder filter! Reply with quote  Mark this post and the followings unread

arnoid wrote:
I also had problems to get self-oscillations of the resonance on this module I tryed different JFET without result.
Changing 680K in 150K did the trick for me.

I love the sound of this filter thx for the design yves.


I just finished this filter and it works great. When tweaking the resonance control circuit, I actually set up a socket and tried 10 different 2N3819 FETS and they all pretty much worked the same.

The breakthrough was to apply positive voltage to the Resonance Mod input -- indeed, +3 volts was sufficient to make the filter self-oscillate.

The solution was to find a lower value for R41. I hooked up a variable resistor and discovered that a value of 119K worked well. Since the closest resistor in my stock was 121K, I used it and the filter self-oscillates nicely starting around '9'.

I also added two additional audio input -- I had room on my panel and figured, "Why not?" -- and it works fine.

Yet another great design from Yves!

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negativspace



Joined: Dec 25, 2010
Posts: 17
Location: Manhattan, Kansas

PostPosted: Mon Jan 24, 2011 4:22 am    Post subject: Reply with quote  Mark this post and the followings unread

Interesting that you settled on the value you did, Kevin. I build one of these a couple of weeks ago, and I ended up using a 120k resistor in that spot to achieve the same resonance behavior you describe.
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bc547c



Joined: Jan 21, 2013
Posts: 2
Location: Italy
Audio files: 1

PostPosted: Mon Jan 21, 2013 3:00 am    Post subject:  yusynth diode ladder filter problem
Subject description: cutoff "hole" in cutoff pot
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Hello, sorry for reposting this old post;
i have already built one of these filter, after classic 220K mod for resonance but I have a big problem:
- when I turn the cutoff pot to the max range I listen a "hole" in filtering; this hole become present about to the end of the range of the pot.
What's the problem? Bad matched diode? I don't use a polyester cap but red cap type with tolerance of 4%...
I use a CA3096, Harris CA3046 and TL074, the cutoff pot is good (Alpha 10K lin).
I try different pot ma the problem still remain.

I post a demo of the problem:
Than you


Untitled2.mp3
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