[sdiy] Analog Computers ( again )

[David G. Dixon]

>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).

David G. Dixon
Professor
Department of Materials Engineering
University of British Columbia
309-6350 Stores Road
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Canada
 
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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 Paul Anderson
> Sent: Monday, February 09, 2009 5:52 PM
> To: xyzzy at sysabend.org; synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Analog Computers ( again )
> 
> On Mon, Feb 9, 2009 at 6:46 PM, Tom Arnold <xyzzy at sysabend.org> wrote:
> >
> > I've extensively searched online already so anyone have some pointers
> for
> > analog computer building blocks?  Reading some usage tutorials right now
> and
> > am pondering building some simple blocks to play with.
> >
> >
> I would pick a copy of the Op-Amp Cookbook.  There are also app notes
> from National Semiconductor and other outfits that show the design of
> integrators and differentiators.  Multiplication/division and
> addition/substraction are very simple to implement using gain and the
> inverting inputs.
> 
> 
> --
> Paul Anderson
> VE3HOP
> wackyvorlon at gmail.com
> http://www.andersonloco.com
> QRP ARCI #13228, GQRP #12447
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