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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
Ultimate Expander Calibration
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Emusicman



Joined: Jun 17, 2018
Posts: 6
Location: Canada

PostPosted: Mon Apr 27, 2020 2:08 pm    Post subject: Ultimate Expander Calibration Reply with quote  Mark this post and the followings unread

Hello everyone, hope everybody is healthy and safe. Working on MFOS Soundlab
Expander, calibrating the VCF State Filter and I hear it through my amp and when I go to read the frequency I am not sure where to take it from. I looked at the schematic to compare with the filter on the Ultimate but no luck. Any help would be appreciated.
Thanks in advance
Steve
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Bodo1967



Joined: Aug 10, 2016
Posts: 14
Location: Germany

PostPosted: Wed Aug 19, 2020 6:05 am    Post subject: Reply with quote  Mark this post and the followings unread

If I understood you correctly, this is about proper 1V/octace tracking calibration, right?

- remove all input signal from the filter
- turn up resonance until the filter starts to self oscillate (proper sine wave)
- apply a defined voltage into the CV input (for instance, from a Keystep controller)
- monitor the LP output
- do the calibration process until the frequency at the LP output is exactly twice as high if you press a key one octave above the initial one on the Keystep (or whatever you use as a CV source)

There's a lot of info and pictures including mine in the build thread on Muffwiggler: https://www.muffwiggler.com/forum/viewtopic.php?f=80&t=177831&start=50

HTH
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