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



Joined: Apr 27, 2007
Posts: 540
Location: Argentina

PostPosted: Sat Jul 18, 2009 6:26 pm    Post subject: Steiner VCF
Subject description: Cuttof Potentiometer Range
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Hi Yves:
Today I finished the Steiner VCF, I love how it sounds!!!
In the schematics and wiring diagram there isn't a input attenuator pot, so I
used a 50K log, as in the Minimoog VCF. It worked well, but I want to be sure
is the right value.
Also the cutoff frequency potentiometer has a strange range. It reaches the
maximum frequency about half the travel. It's OK in the low end (could be lower,
but not much).
I played a bit with the VA/Oct trimmer, but it seem to affect the behavior towards
the low end, so it doesn't improve the point where the potentiometer reaches the
max frequency.
To be clear, by max frequency I mean the point where the filter is totally open.
So the frequency range is compressed in the lower half of the potentiometer
and I want to span it to the full travel.
What could be wrong (If it is something wrong) or how can I modify the behavior.
Thanks a lot for this project.

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yusynth



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

PostPosted: Sun Jul 19, 2009 9:47 am    Post subject: Reply with quote  Mark this post and the followings unread

which version? CA3096 or 2SC1583
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Sebo



Joined: Apr 27, 2007
Posts: 540
Location: Argentina

PostPosted: Sun Jul 19, 2009 4:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

I built the 2SC1583 version.
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yusynth



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

PostPosted: Sun Jul 19, 2009 11:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Sebo

Yes 50K log is OK.

Concerning the frequency range, check that R21 is 68K and R22 is 220K and P1 57K/50K lin .
If this is the case then you may increase the value of R22 up to 390K

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Sebo



Joined: Apr 27, 2007
Posts: 540
Location: Argentina

PostPosted: Mon Jul 20, 2009 5:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Yves!!!
I will check the components and report back.

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Sebo



Joined: Apr 27, 2007
Posts: 540
Location: Argentina

PostPosted: Tue Jul 21, 2009 11:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Yves:
I'm a little confused here, in my build, P1 is 50K lin, that's OK, but R21 is 47K
and R22 is 150K as listed in your site for the 2SC1583 version. The values
you are giving me are for the CA3096 version. Should I try the other values?
Or should I rise the value of R22?
Thanks.

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yusynth



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

PostPosted: Tue Jul 21, 2009 11:41 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes you're right I checked the wrong schemo, in such a case yes increase the value of R22 (either a 270K or a 220K)
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Sebo



Joined: Apr 27, 2007
Posts: 540
Location: Argentina

PostPosted: Wed Aug 05, 2009 6:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi Yves:
I finally added a 130K resistor in series with R22 (for a total resistance of 280K)
at the wiper of the frequency pot.
The range of the frequency cutoff si a little narrow yet, but if I increase R22
the high limit goes out of range. I think the range is OK anyway.
The filter sounds amazing!!!
Thanks a lot for the help.
Here are some pictures.


Yusynth Steiner VCF Front.JPG
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Yusynth Steiner VCF Front.JPG



Yusynth Steiner VCF Back.jpg
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Yusynth Steiner VCF Back.jpg



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Sebo
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yusynth



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

PostPosted: Thu Aug 06, 2009 1:39 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the photos, they join the gallery section of my site.

Cheers

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xi-boy



Joined: Dec 16, 2008
Posts: 18
Location: germany

PostPosted: Mon Nov 02, 2009 10:08 am    Post subject: Reply with quote  Mark this post and the followings unread

a newbie question:
im a bit confused with the ca3096 versions
does ca3096e also fit ?

thanks + best wishes
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yusynth



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

PostPosted: Mon Nov 02, 2009 12:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

xi-boy wrote:
a newbie question:
im a bit confused with the ca3096 versions
does ca3096e also fit ?

thanks + best wishes


I suppose so

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