[sdiy] saw to tri/sine options

[David G. Dixon]

Well done, Ian!  For me to do it would have involved desoldering a couple of
components on a pristine (finished) module, so I gave it a miss.

It doesn't sound like there's enough difference between the two to warrant a
switch, but others may disagree...

David G. Dixon
Professor
Department of Materials Engineering
University of British Columbia
309-6350 Stores Road
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> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
> bounces at dropmix.xs4all.nl] On Behalf Of Ian Fritz
> Sent: Tuesday, June 02, 2009 8:21 AM
> To: Jerry Gray-Eskue; synth-diy at dropmix.xs4all.nl
> Subject: RE: [sdiy] saw to tri/sine options
> 
> I have posted an mp3 comparing the rounded vs straight Saw on the e-m
> forum:
> http://electro-music.com/forum/viewtopic.php?p=247574#247574
> The rounded waveform has relatively less even-harmonic content so its not
> quite as buzzy.
> 
> And of course there is no frequency division -- the waves have the same
> period.
> 
>    Ian
> 
> 
> At 08:55 AM 6/2/2009, Jerry Gray-Eskue wrote:
> 
> >I have had some time to think through what the sine function would do in
> >relation to the original ramp or saw wave and have a postulate:
> >
> >With a triangle wave centered on 0 volts we get all 4 quadrants of the
> sine
> >wave generated over the same period so the Frequency out = Frequency in.
> >
> >With a ramp or saw centered on 0 volts we get 2 quadrants of the sine
> wave
> >generated over the same period so the Frequency out = Frequency in/2.
> >
> >With a ramp or saw offset to all positive or negative (i.e. 0v - 10v) we
> get
> >1 quadrant of the sine wave generated over the same period so the
> Frequency
> >out = Frequency in/4.
> >
> >
> >
> >-----Original Message-----
> >From: synth-diy-bounces at dropmix.xs4all.nl
> >[mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of Kyle Stephens
> >Sent: Monday, June 01, 2009 10:25 PM
> >To: synth-diy at dropmix.xs4all.nl
> >Subject: Re: [sdiy] saw to tri/sine options
> >
> >
> >
> >A little out of idle curiosity (and to better under stand how the concept
> >works), what happens when you put a non-triangle wave through a tri to
> sine
> >waveshaper?
> >
> >Say you use a saw, does that get you a halfway-there sine? By my same
> >possibly misplaced logic, would a square wave not be affected much, if at
> >all?
> >
> >I at least haven't seen something like that before, so guess the results
> >aren't all that interesting?
> >
> >
> >_Kyle
> >
> >--- On Mon, 6/1/09, mark verbos <mverbos at earthlink.net> wrote:
> >
> > > From: mark verbos <mverbos at earthlink.net>
> > > Subject: Re: [sdiy] saw to tri/sine options
> > > To: "Synth DIY" <synth-diy at dropmix.xs4all.nl>
> > > Date: Monday, June 1, 2009, 5:17 PM
> > > These are essentially time
> > > independent. They are just a transfer
> > > function of voltage in to voltage out. So, perfectly. I
> > > would think.
> > >
> > > Mark
> > >
> > >
> > >
> > >
> > > On Jun 1, 2009, at 6:07 PM, Jerry Gray-Eskue wrote:
> > >
> > > >
> > > > I am curious, How well do these hold the waveform peak
> > > to peak
> > > > voltage and
> > > > sine wave shape from low to high end frequencies?
> > > >
> > > >
> > > >
> > > > -----Original Message-----
> > > > From: synth-diy-bounces at dropmix.xs4all.nl
> > > > [mailto:synth-diy-bounces at dropmix.xs4all.nl]On
> > > Behalf Of mark verbos
> > > > Sent: Monday, June 01, 2009 4:14 PM
> > > > To: Scott
> > > > Cc: Synth DIY
> > > > Subject: Re: [sdiy] saw to tri/sine options
> > > >
> > > >
> > > >
> > > > On Jun 1, 2009, at 4:37 PM, Scott wrote:
> > > >
> > > >> I'm trying to pick out a saw to tri/sine converter
> > > for a VCO I'm
> > > >> building (j.h.living).  Is there much
> > > difference between the various
> > > >> types?  Looking through my bookmarks I see a
> > > few..
> > > >>
> > > >> Bergfotron uses transistors
> > > >> http://hem.bredband.net/bersyn/VCO/Saw%20to%20tri-sin%20W.gif
> > > >
> > > > This was pulled from the Moog Modular I believe.
> > > Jörgen seems to like
> > > > it a lot.
> > > >>
> > > >>
> > > >> ASM uses diodes
> > > >> http://www.elby-designs.com/asm-2/vco/vco1-shaper-asm2-cct.pdf
> > > >
> > > > This one is also used by Doepfer. It's light on parts,
> > > but high on
> > > > harmonic distortion.
> > > >
> > > >
> > > >>
> > > >>
> > > >> rwilson uses a 13700 (nothing direct, but it's on
> > > the VCO schematic)
> > > >>
> > > >
> >http://www.musicfromouterspace.com/analogsynth/VCO200604REV01/vcoschemati
> cpa
> > > > ge2.gif
> > > >>
> > > >> Thanks!
> > > >>
> > > >>
> > > >>
> > > >> _______________________________________________
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