[sdiy] saw to tri/sine options

[Kyle Stephens]

My, seems I've kinda discovered a monster? Stephensine as Jerry put it (good one!) or Tim's Sawn wave, either way ;)

The most powerful simulation tool in my arsenal right now is Microsoft Excel, which I know pretty well and otherwise use for most of my number crunching, but I wasn't sure how to express a tri wave in there though, and even less so the waveshaper transfer function, so very cool and my thanks to those who had the tools and know how to let us know the math behind it and hear what it would sound like (thanks Ian, David, Aaron, JH and Jerry!)

As for Dan, Aaron proposed the effect of running an 'incorrect' wave into the 'shaper might be Tube Screamerish - weird waves to be sure. Maybe try the TH VCO-1 waveshaper as mentioned earlier in this thread...

Waveshaper: http://mypeoplepc.com/members/scottnoanh/sitebuildercontent/sitebuilderfiles/vco1_schem2.pdf

>From here: http://mypeoplepc.com/members/scottnoanh/birthofasynth/id33.html


...with some pots instead of just trimmers (like the gain pot idea Mark mentioned), see what happens when you mess with the symmetry and the input level? I think Germanium transistors would be tricky but might give you an interesting sound if you can get a hold of a pair, a la a Fuzz Face or Zvex Fuzz Factory (though that might open a whole can of worms/mojo-voodoo debate when it comes to finding the 'right', if there is such a thing, beta values for the Germanium transistors). I wana give it a try on the breadboard today.


Another question though: do you get a peak-ish wave when you run a sine into the same sine waveshaper? Sin^2(x)?


_Kyle

--- On Tue, 6/2/09, mark verbos <mverbos at earthlink.net> wrote:

> From: mark verbos <mverbos at earthlink.net>
> Subject: Re: [sdiy] saw to tri/sine options
> To: "David G. Dixon" <dixon at interchange.ubc.ca>
> Cc: "'Synth DIY'" <synth-diy at dropmix.xs4all.nl>
> Date: Tuesday, June 2, 2009, 10:45 AM
> add a gain control on the input while
> you
> re at it
> 
> Mark
> 
> 
> 
> On Jun 2, 2009, at 2:21 AM, David G. Dixon wrote:
> 
> > Now I'm thinking I'll have to add a switch to my
> oscillator to route  
> > the saw
> > through the sine shaper.  This effect cannot be
> obtained by filtering.
> >
> >> On Jun 2, 2009, at 12:10 AM, David G. Dixon
> wrote:
> >>
> >>> For saw input, the result is a saw with a
> sigmoidal (i.e., S-shaped)
> >>> downslope rather than a straight one. 
> It's basically the downward
> >>> sloping
> >>> half of a sine wave, which stands to
> reason.  I would bet that this
> >>> waveform
> >>> sounds rather pleasant.  I'll have to
> give it a try.
> >>
> >> You could try running anything through it. I
> imagine the effect would
> >> be much like a Tube Screamer.
> >>
> >> - Aaron
> >
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