[sdiy] Yves Usson's Minimoog Filter

Jay Schwichtenberg jschwich53 at comcast.net
Tue Jun 13 21:17:49 CEST 2023

In my morning music search on YouTube I found this video. From the 
comment section for the video:

"The filter is a YuSynth Minimoog clone, which I highly recommend to 
absolutely everyone."

Jay S.


On 6/12/2023 3:44 PM, David G Dixon via Synth-diy wrote:
> So, I replaced a couple of the trimmers on my Minimoog filter board -- 
> the 1k and 500R trimmers were one-turn wonders, and the 500R was 
> actually a 470R cheapo flat trimmer that shorted out every time I put 
> a screwdriver in it.  I replaced them with proper 18-turn trimmers, 
> and I think the circuit works better now.
> So, it seemed to work pretty well.  I was getting good filtering.  It 
> still didn't sound much like a Minimoog to me.  Also, I don't really 
> like the way that it responds to high resonance.
> Then I swapped the feedback resistors on the input and output 
> amplifiers (56k to 120k on the input, 120k to 56k on the output) to 
> make them both unity gain and drive the filter a bit more.  This 
> certainly did not improve things.  At the highest input attenuator 
> setting, the filter just sounds harsh and unpleasant.  At a middle 
> setting, it sounds much better, but simply isn't loud enough.  Hence, 
> that was a bad idea, and I will swap them back.
> Then, using the same VCO and ADSR settings, I switched to my Dr. 
> Octature Roland-style filter (but with gain cells to eliminate signal 
> droop with resonance) -- this filter simply sounds brilliant (to me). 
> It's loud, snappy, has much more pleasing resonance, and "she responds 
> like a limousine brought alive on the silver screen" to incoming CV 
> from the ADSR.
> Maybe I just don't need a Minimoog filter.  Or maybe there is still 
> something wrong with it.  I don't know.  I'm half done building the 
> same board with 547/557 instead of 3904/3906.  I'm going to finish 
> that board and put it in the module to see if it is any better.  If 
> not, then I will probably just abandon the whole idea of building a 
> Minimoog filter.
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