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 Forum index » DIY Hardware and Software » YuSynth
Steiner VCF CA3096 Version
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fantozzi



Joined: Jan 15, 2012
Posts: 10
Location: Berlin
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PostPosted: Sun Jan 15, 2012 10:57 am    Post subject: Steiner VCF CA3096 Version
Subject description: noises while turning the RES POT
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Hello Yves, Hello Forum,

I build 2 times Steiner VCF in the CA3096 Version(some years ago).

They are working fine, exept the RES POTs.

I hear heavy noises while turning the RES POT and the sounds turns off for a while (as you hear in the mp3).

I try serveral POTs over the time, always with the same result --> so i think i made something wrong while soldering.

Maybe you or somebody who build this filter know the problem and can help?

thanks in advance
fantozzi


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yusynth



Joined: Nov 24, 2005
Posts: 1233
Location: France

PostPosted: Thu Jan 19, 2012 12:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

No unfortunately it is due to the design of the filter itself , the resonance loop in this circuit controls at the same time the gain of the output and is very sensitive to the least imperfection of a carbon track. You must use a very good quality potentiometer (preferably of the plastic track kind).
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fantozzi



Joined: Jan 15, 2012
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Location: Berlin
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PostPosted: Sat Jan 21, 2012 2:16 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you for your reply,

it is good to know that everything is ok.

best regards
fantozzi
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jumunius



Joined: Apr 19, 2010
Posts: 346
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PostPosted: Mon Mar 19, 2012 9:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi, perhaps the info at this thread related to the CGS version would be useful? I assume it's equally relevant to all the Steiner variations.

Good to know about the pot tracks, incidentally. Someday I hope to buy some nicer 1k pots, which would apparently help here.

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