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 Forum index » DIY Hardware and Software » Jürgen Haible designs
Frequency Range calculations for Poly Moog Resonator
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widdly



Joined: Jun 25, 2007
Posts: 265
Location: singapore
G2 patch files: 2

PostPosted: Fri Jun 04, 2010 12:30 am    Post subject: Frequency Range calculations for Poly Moog Resonator Reply with quote  Mark this post and the followings unread

I want to build a polymoog resonator but with 4 filters instead of three. I have a nice enclosure from a 4 band parametric eq that I would like to reuse.

Do you think it would work ok to just duplicate the middle band or would it be better to shift all the bands further apart?

Any suggestions for what value capacitors to use?

Also, I tried calculating the frequency based on this page...

http://www.daycounter.com/Filters/StateVariableFilters/State-Variable-Filter-Design-Equations.phtml

.. So I figured I could calculate the frequency range using..

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Using R1 = R2 = 12.4x10^3 and C1 = C2 = 68x10^-9 I get w = 1186 which would be 187Hz

Using R1 = R2 = 2.4x10^3 and C1 = C2 = 68x10^-9 I get w = 6127 which would be 975Hz

Is that the correct way to calculate it? My results don't tally with the ranges on the front panel of the original moog.
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