[sdiy] Back, and Buchla 291 simulation

jhaible jhaible at debitel.net
Sun Aug 24 13:50:28 CEST 2003


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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