[sdiy] expo accuracy? or integrator accuracy?, or both?

[Magnus Danielson]

From: Scott Gravenhorst <music.maker at gte.net>
Subject: Re: [sdiy] expo accuracy? or integrator accuracy?, or both?
Date: Sun, 09 Feb 2003 07:11:07 -0800 (null)

> Grant Richter <grichter at asapnet.net> wrote:
> >> I've had an ASM-1 VCO measure in at a 21 octave range, but the last part
> >> wasn't
> >
> >That would be about 6 decades or 10E-9 to 10E-3 from the current source.
> >
> >That should be normal for an exponential pair, but of course a current of
> >10E-9 can easily leak away or be absorbed by bias currents.
> >
> >Rather than perfecting the a "good enough" core, wouldn't it be more
> >interesting to investigate new dynamic waveshaping designs like the Buchla
> >Music Easel?
> >
> >It seems to me the frequency stability is acceptable, but new timbral design
> >has barely been touched on. Timbre is arguably the next most important
> >parameter after pitch is satisfactory.
> 
> Hear hear!  Does "dynamic waveshaping" mean "ever changing" or in our world,
> voltage controlled ?  I would love to play more with this.  I've done the
> usual messing with VCO sync, PWM and a bit of folding, but not much more. 
> Bifurcation, as in the Chua chaos oscillator system, looks cool, but the Chua
> seems too "out of control" for my use.

A Chua oscillator for modulation source then?
That would allow you to control the depth of the chaos according to your needs.

BTW, I recently got a book where Chua himself had written about non-linear
curcuits. Sure enought, in there I even found Chua chaos oscillators! ;O)
That was in a very serious (and for most people pretty booring) book, so I was
delighted to find it in there.

BTW, did you people know that there are curcuit elements which behaves like
half-pole components? -3dB/Oct curve and all.

Cheers,
Magnus