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 Forum index » DIY Hardware and Software » Developers' Corner
Rick Jansen's modified Moog ladder filter design question..
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jpdesroc



Joined: Dec 05, 2007
Posts: 27
Location: Canada

PostPosted: Fri Mar 14, 2014 7:05 am    Post subject: Rick Jansen's modified Moog ladder filter design question.. Reply with quote  Mark this post and the followings unread

Hi list,

I'm about to build Rick Jansen's modified Moog ladder filter posted here:

http://dropmix.xs4all.nl/rick/Emusic/Moog/moogvcf_schematic.gif

I would like to change the resistor R15 2k37 1% for
a 1k 1% 3300ppm tempco but this will change the overall
A3 opamp gain and screw up the 1v/oct ratio on input called "KOV"
and all the other CV inputs.
Since I don't know the exact mv/oct value this schematic needs at Q1 base
for a good oscillation tracking, can you help ?
So far I could change R10 value from 100k to 42k2 to get probably the same
gain ration as the original keyboard 1v/oct input but...
Your suggestions are very welcomed.

J-Pierre Desrochers
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L´Andratté



Joined: Sep 23, 2012
Posts: 56
Location: Hamburg, Germany
Audio files: 5

PostPosted: Sat Mar 15, 2014 5:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

18 mV
check this
http://electronotes.netfirms.com/s019.pdf
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jpdesroc



Joined: Dec 05, 2007
Posts: 27
Location: Canada

PostPosted: Sun Mar 16, 2014 9:22 am    Post subject: Reply with quote  Mark this post and the followings unread

That's exactly what I was looking for !!!!!

Thanks a lot.
J-Pierre
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L´Andratté



Joined: Sep 23, 2012
Posts: 56
Location: Hamburg, Germany
Audio files: 5

PostPosted: Mon Mar 17, 2014 4:34 am    Post subject: Reply with quote  Mark this post and the followings unread

My pleasure Wink
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