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 Forum index » DIY Hardware and Software » YuSynth
Steiner VCF
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Omega



Joined: Oct 11, 2010
Posts: 15
Location: Böblingen

PostPosted: Wed May 04, 2011 6:17 am    Post subject: Steiner VCF
Subject description: Resonance not really adjustable
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Hi everyone,

I build the Steiner VCF and it works fine when I put a signal in. But trying to autooscillate the filter looks like a on/off system. What I did was: eliminating the input source, turn counter clockwise the input poti and then turn clockwise the resonance poti. Until 85 % of the way the output shows nothing. Then very apruptly I got a signal. It seems to be a clipped signal, it's a rectangle with an aplitude of 30 V peak to peak. And I am not able to reduce the signal. At a certain moment the signal disappears suddenly. Turning a very, very small bit in the other direktion the signal appears again with this huge amplitude.

Does anyone can give me a hint where I can look at. I've resoldered nearly everything. I rechecked the values of the resistors and capacitors. Everything seems to be o.k.

Thank you in advance !!

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Bernhard
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yusynth



Joined: Nov 24, 2005
Posts: 1222
Location: France

PostPosted: Fri May 06, 2011 2:03 am    Post subject: Reply with quote  Mark this post and the followings unread

No that's normal this filter is no good at auto-oscillating gently in this version of the design.
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Yves
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Omega



Joined: Oct 11, 2010
Posts: 15
Location: Böblingen

PostPosted: Sun May 08, 2011 11:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hello Yves,

thank you for the reply. Then everything is looking fine. Great !

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Bernhard
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