[sdiy-interim] Fwd: PLL (4046) for pitch tracking?

[Loscha]

David, that circuit was the "Mini Synth" from Dick Smith's Funway into
Electronics Book Three (the Yellow Book, first was Orange/Red second
was a bleary slightly yellow Green).

 I got the last of the original PCBs from their spares department a
few months ago. They were (gasp) six dollars and sixty six cents each
(I kid you not).

 I've not built any yet.

I (think) I've uploaded the rest of the files I have on the RPS-10, my
ftp program (maybe server) is being a bit dutch about the way it's
handling files.
 They should work.  If anyone actually needs them, they're in my Gmail
outbox, and I can forward them the email containing all documents.....

http://www.loscha.com/fidgety/PCB%20layout.gif
http://www.loscha.com/fidgety/rps10-calibrations.gif
http://www.loscha.com/fidgety/rps10-master-schematic-450dpi.gif
http://www.loscha.com/fidgety/rps10-parts-list.gif

-edward

On 3/29/07, David Moylan <dave at westphila.net> wrote:
> I built a circuit from an article I found online.  I can't remember
> where I found it.  It's 7 scanned pages that describe a dual 4046 pitch
> tracker with 1 octave up/down switching on each that I think was
> available as a kit.  It has some basic gating circuitry to hold the 4046
> pitch when the signal gets too low.
>
> I've used it with guitar and it has a little glitch at the beginning of
> a picked note, not too much octave jumping, but it sucks during the
> decay.  It doesn't have enough signal pre-treatment for a guitar and
> it's simple hold scheme isn't sufficient (mostly in figuring out a
> proper gate).
>
> It does however do cool things to non-harmonic percussive sources - like
> electronics drums and cymbals and would probably work well on some
> woodwinds where the player can cut the notes off quickly.
>
> I have an almost complete board for Craig Anderton's Rocktave Divider
> which I'd like to pick the fuzz signal off of (should be a reasonable
> square at fundamental freq.) to try to drive the PLL.  The Rocktave has
> a fair amount of LPF followed by a compressor which smooths the input
> and makes up for higher notes being rolled off.  (note the NE570 also
> used in the Boss)  I think it would give a much better signal to drive
> the PLL.  It also has an output VCA which follows the input level, so
> the octaves fade out as the signal is fading towards a point it can't
> track.  Using a PLL in a sort of effects loop in the Rocktave might work
> well.
>
> Oh, just remembered.  The Rocktave article and the "mini synth" (PLL)
> article can both be found at generalguitargadgets.com.  Search 'synth'
> to find the mini synth.
>
> Dave
>
> Loscha wrote:
> > Don't believe the manual!
> > It functions in it's pitch tracking mode over quite a wide range ---
> > it outputs a toothy wave to the "tuner out" port on the back in pitch
> > mode.
> >
> > http://www.loscha.com/fidgety/rps10-master-schematic-450dpi.gif
> >
> > This is my scan, from a schematic I purchased, hope it helps some people out.
> > I have the rest of the manual, if anyone needs a hand to get their
> > RPS-10 calibrated.
> >
> > On 3/29/07, Andre Majorel <aym-htnys at teaser.fr> wrote:
> >> On 2007-03-28 23:57 +1000, Loscha wrote:
> >>> On 3/28/07, Gorka Garcia <torpedo at demadrid.com> wrote:
> >>>
> >>>> Has anyone tried a PLL (4046, for example) for pitch tracking?
> >>>> Maybe to make a pitch to CV converter for a theremin or a mono
> >>>> played guitar
> >>> Boss RPS-10,
> >>> has a pitch tracking input in the back for it's pitch shifter mode.
> >>> Uses the 4046.
> >>> Tracks quite well, has a good enough range to use of the majority of
> >>> the guitar's neck (the highs are filtered by the input stage, I
> >>> haven't opened it up, but, I imagine it would only get better as you
> >>> ascended into double digits of kilohertz.
> >> The manual says C5 through C7, C6 being the neutral point. That's
> >> 500 Hz through 2 kHz.
> >>
> >> --
> >> André Majorel <URL:http://www.teaser.fr/~amajorel/>
> >> Do not use this account for regular correspondence.
> >> See the URL above for contact information.
> >>
> >> _____________________________________________________________________
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> >>
> >
> >
> > --
> > www.loscha.com
> >
> >
>
>
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-- 
www.loscha.com

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