[sdiy] Glide question

[megaohm]

Constant time glide would be great!
It's something I do a lot (unconsciously/naturally) when playing
guitar. I wasn't planning on slew generator experiments at the moment
but this thread has inspired me.
Achim, could you elaborate a bit on your suggestions of how this could be done?

Thanks,
p.

On Mon, Sep 6, 2010 at 2:10 PM, ASSI <Stromeko at nexgo.de> wrote:
> 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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