[sdiy] Buchla 291 simulation 2

jhaible jhaible at debitel.net
Sun Aug 24 13:58:50 CEST 2003


Oh, and here is the simulation model
(not the circuit - a mix of behavioral model and schematic)

JH.



-----Ursprüngliche Nachricht-----
Von: jhaible <jhaible at debitel.net>
An: diy <synth-diy at dropmix.xs4all.nl>
Gesendet: Sonntag, 24. August 2003 13:50
Betreff: [sdiy] Back, and Buchla 291 simulation


> Hi,
>
> I'm back from holidays
> 2 weeks without a soldering iron
> But with a Korg Lambda and a book on music theory
> Good to shift the focus from technical stuff to music
> for a while
> Think I finally understood the tritone substitution (;->)
>
> Back to electronics:
>
> Before I left for holidays, I made some quick simulations
> of the Buchla 291 BPF.
>
> I found that the level of the resonant peak varies a lot with
> the center frequency. There is also a trimmer to adjust
> _how_ it varies, but it's not possible to get a even response.
> In the low range, peaks are always higher. It can be adjusted
> to fall monotonously towards high frequencies, or to create a "dip"
> in the mid frequency range.
>
> Can anybody confirm this?
> Was this intentional? (Like, creating less emphasis in a region
> where harmonics of the source material might have higher
> levels anyway?)
>
> It's just a quick and dirty simulation, so I may just have made
> a mistake. But I vaguely remember somebody mentioning
> the unique character of this filter. Maybe that's an explanation.
>
> Simulation scans attached to this mail.
>
> JH.
>
>
>
>
>
>
>
>


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end



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