[sdiy] CEM VCF transconductance stage difference!

[mark verbos]

Jürgen from Jomox once gave me a demo of his Sunsyn, while he was  
finishing up its design. The 4 poles on it's filter can be switched  
from hipass to lopass to notch and each one has an offset control.  
With just one pole offset from the others he got the resonance to  
behave what he described as "like a 303." It was pronounced resonance,  
but it did not self oscillate. I have always assumed that this is the  
point of having a different cap on one pole. Is this incorrect?

Mark





On Dec 26, 2008, at 2:36 PM, karl dalen wrote:

> Did anyone figured out why Doug Curtis used such a (gm) difference  
> between
> the last transductor and the preceding 3 in his filters? Factors of  
> 50,
> 75 and 100 times can be found in his various designs.
>
> Reg
> KD
>
>
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