YUSYNTH EMS-diode ladder filter

Sebo · Joined: Apr 27, 2007 Posts: 517 Location: Argentina

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.

kkissinger · Posted: Mon Jan 17, 2011 3:41 pm Post subject: Another diode ladder filter!

negativspace · Joined: Dec 25, 2010 Posts: 15 Location: Manhattan, Kansas

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.

bc547c

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

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