On 2009-05-18 19:19 +0200, JH. wrote:
> It's the ∗same∗ PCB, and the ∗same∗ order form.
>
> I just sent two emails because some people who are into phaser
> shopping may overlook it when they read filter, and vice versa.
Thank you. I hope the pre-order phase is not closed because I'm
still busy trying to wrap my head around that project. Here's
what I've got so far :
- varislope_filter_phaser_sch1.pdf is the "meat" of the project,
the phaser/filter itself,
- varislope_filter_phaser_sch2.pdf is the PSU and the (very
elaborate) modulation source that consists of Q11 + U18 = noise
generator, U17B + C31 = S&H, U13 + C19 = LFO, U15 + U16 + U17A =
wave shapers + scanner (I think).
The difference between the filter-only version and the full
version is that the modulation source is omitted and the 6 DG419
switches are replaced by straps.
I guess a third way to build the varislope would be to omit the
modulation source but keep the DG419 so it can still be a phaser
or filter.
Personally, I'm not sure about this modulation source. I suspect
that, on my unit, the waveform pot would be permanently stuck in
pure sine position, making the scanner redundant. The other
sources I see myself using (velocity, EG and sawtooth LFO) all
have to come from other modules anyway.
In theory, each pole could individually be switched between
all-pass (phaser) and low-pass (filter) under voltage control. If
all poles are sonically interchangeable, a single CV could be
used with the number of LP poles being 6/5 of the CV. No idea how
to do that, nor how useful it would be.
--
André Majorel <URL:
http://www.teaser.fr/~amajorel/>