[sdiy] Glide question

[ASSI]

On Monday 06 September 2010, Tom Wiltshire wrote:
> On 6 Sep 2010, at 12:47, cheater cheater wrote:
> > I guess you can get a constant-time linear glide too, since you know
> > the endpoints - the values of the steps you are gliding through - so
> > that should be easy (for someone who knows what they're doing, i.e.
> > not me!)
> 
> In the digital domain this would be easy. Analogue, I'm not so sure.
> You'd need to alter the integrator charging current based on the size of
> the step. Still, it isn't impossible.

Not too tricky, really.  You sample the initial current from an RC and then 
keep this as a constant current or alternatively you make a servo around the 
RC that keeps the initial voltage drop constant.  Either way, the time to 
reach threshold becomes RC, whatever the step size.


Achim.
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