[sdiy] Analog Computers ( again )

[Dave Leith]

This link just showed up on the muffwiggler forum

http://ericarcher.net/devices/analog-computer-bouncing-ball/

also worth having a look at the "device" section of the website

Dave

On 2/10/09, David G. Dixon <dixon at interchange.ubc.ca> wrote:
> Aaron:
>
>  Cool.  I'll have to watch it sometime.  (I've watched a few of your other
>  lectures and found them pretty informative -- the one on expo converters
>  really opened my eyes!)
>
>  Cheers,
>  Dave
>
>
>  David G. Dixon
>  Professor
>  Department of Materials Engineering
>  University of British Columbia
>  309-6350 Stores Road
>  Vancouver, B.C. V6T 1Z4
>  Canada
>
>  Tel 1-604-822-3679
>  Fax 1-604-822-3619
>
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>  > -----Original Message-----
>  > From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
>
> > bounces at dropmix.xs4all.nl] On Behalf Of Aaron Lanterman
>  > Sent: Tuesday, February 10, 2009 2:52 PM
>  > To: Synth DIY
>  > Subject: Re: [sdiy] Analog Computers ( again )
>  >
>  >
>
> > On Feb 9, 2009, at 9:22 PM, David G. Dixon wrote:
>  >
>  > >> From what I understand, the state-variable filter we use in synths
>  > >> is also
>  > > an analog computer for the general mass-spring-damper second-order
>  > > differential equation problem from Newtonian physics.  Voltages
>  > > representing
>  > > displacement, velocity and acceleration are tapped off from various
>  > > points
>  > > within the filter circuit.  It's all very easy to do with Laplace
>  > > transforms
>  > > (apparently).
>  >
>  > I do a lecture on this in my Electronics for Music Synthesis class):
>  >
>  > http://blip.tv/file/777499 (about half an hour in)
>  >
>  > Also see here:
>  >
>  > http://web.mit.edu/2.161/www/Handouts/LPOpAmp.pdf
>  >
>  > - Aaron
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