Rate CV was: RE: Joysticks [was: SV: [sdiy] Matrix FX preliminary panel]

[Harry Bissell Jr]

The trouble with this idea is that the
derivative is strictly 'dynamic'... it stops
as soon as the motion does. Would you 'sample'
it, if so, when.  

Rate of change could be tough, you might need to do a
log amp on the output. You would want to sense really
slow motion but you could get FAST motion as well.

If I'm not mistaken, the derivative will give a peak
on acceleration AND deceleration. If you rectify that
you will get a double bump.  I'd suggest you need to
use only the acceleration signal (or hell, one, the
other, or both.

Tricky circuit, possibly of questionable utility
imho...

H^) harry

--- Michael Ruberto <frankentron at hotmail.com> wrote:

> 
> >
> >
> >Use a differentiator! Possibly with a precision
> fullwave rectifier to get 
> >the same result when traveling upward vs downwards.
> >
> >(A differentiator is an integrator with the
> capacitor and resistor 
> >exchanged)
> >
> >
> 
> Yes, changing the differentiators output so that
> it's always positive would 
> work. I'll try both, the differentiator/rectifier
> and the lag/difference 
> method to see if one works better than the other.
> 
> M. A. Ruberto
> 
> 
>