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 Forum index » DIY Hardware and Software » YuSynth
Minimoog filter - Yusynth/René Schmitz differences
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Mick Bailey



Joined: Jan 07, 2010
Posts: 15
Location: England

PostPosted: Thu Feb 17, 2022 8:36 am    Post subject: Minimoog filter - Yusynth/René Schmitz differences Reply with quote  Mark this post and the followings unread

Looking at the two schematics there's a considerable difference in resistor choice for the output amplifier - especially the size of R25 in the Yusynth build (22R) and the same resistor marked R6 (1K3) in the René Schmitz circuit. Given the other resistor value changes in this section, are there any differences in how the filter sounds? In particular, does the emphasis control behave differently?

I've heard plenty of Yusynth clips and have this circuit in my own modular, but can't find any clips of the René Schmitz version.

UPDATE: I've just changed my Yusynth output amp to match the René Schmitz values as an experiment. There's no change to the filter cutoff (or at least, I can't hear any difference), but the real change is in how the emphasis control works - I now have a much broader spread of useful range with the control than I had before. It fixed a problem I had with the filter oscillating only within a knife-edge range of rotation, beyond which the volume dropped dramatically (almost to zero). I now get a nice graduation and with the emphasis control at maximum I don't get the sudden volume drop. I double-checked my component values just to be certain I hadn't originally got some wrong parts in there, but all was OK.


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Benjamin AM



Joined: Nov 04, 2010
Posts: 83
Location: Boise

PostPosted: Wed Feb 22, 2023 6:36 am    Post subject: Reply with quote  Mark this post and the followings unread

Did you rework the amp to be non inverting or just match Rene’s values?
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