SV: [sdiy] Prophet modulation refresh rate (was NPO caps in P08 and Andromeda)

[karl dalen]

The updaterate can be figured out by the means of callculating the Fc of the smothness RC net on each S/H chanell!

Or by taking a look at the rate of the LFOs and do an estimation from there. Or sampling a oscillator with the 
shortest decay curve set.

Perhaps?!

KD

--- Den tors 2008-12-11 skrev Tom Wiltshire <tom at electricdruid.net>:

> Från: Tom Wiltshire <tom at electricdruid.net>
> Ämne: [sdiy] Prophet modulation refresh rate (was NPO caps in P08 and Andromeda)
> Till: "Dave Manley" <dlmanley at sonic.net>
> Kopia: synth-diy at dropmix.xs4all.nl
> Datum: torsdag 11 december 2008 01.09
> On 10 Dec 2008, at 19:33, Dave Manley wrote:
> 
> > I'm a little surprised someone hasn't modded
> an evolver and posted some comparisons.  If it made a
> significant audio difference, you'd think this would be
> a popular mod.
> > 
> > With regard to the S/H caps - I believe they are being
> refreshed at a high rate, so don't need big, high
> quality caps.
> 
> That's a question I'd love to know the answer to:
> what is the refresh rate of the modulations in the Prophet
> 08?
> 
> The reason I ask is that I spend a lot of time playing with
> the same dsPIC chips Dave Smith uses in the Prophet, and
> I'm using them for much the same thing (generating LFOs
> and envelopes and other mod sources for output to a DAC) so
> I'd love to know what sample rate he uses for his
> modulations. I suspect it's slower than I'd
> presently countenance, and that I should get over it and
> recognise that there's really no need for mods to go as
> fast as I think they need to! After all, I've never read
> a review or seen a blog entry complaining about slow
> envelopes or sluggish modulation on the new Prophet,
> although one or two mention that some parts of the analogue
> circuitry don't keep up with the highest LFO rates
> (260Hz).
> 
> T.
> 
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