[sdiy] They aren't sawtooths, they're ramps

[Kyle Stephens]

Suppose it's one of those orientation cases; same circuit, just not arranged in the side-by-side format, like in the TH VCO-1 schematic.

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

Still most of the time I just see high gain stages and/or clipping diodes though - have any examples that have a sine shaper in some configuration or another?


_Kyle

--- On Wed, 11/4/09, cheater cheater <cheater00 at gmail.com> wrote:

> From: cheater cheater <cheater00 at gmail.com>
> Subject: Re: [sdiy] They aren't sawtooths, they're ramps
> To: "Kyle Stephens" <lightburnx at yahoo.com>
> Cc: synth-diy at dropmix.xs4all.nl
> Date: Wednesday, November 4, 2009, 2:04 PM
> Sine shapers are a classical guitar
> distortion.
> 
> D.
> 
> On Wed, Nov 4, 2009 at 22:03, Kyle Stephens <lightburnx at yahoo.com>
> wrote:
> > "YOU MEAN THE SIGMOID???? :PPP"
> >
> > Colloquially know as "Stephensine" ;)
> >
> >
> > _Kyle (asked the list a while back what a saw/ramp
> through a sine shaper would sound like) Stephens
> >
> >
> > PS: Aaron Lanterman halfway suggested this - I tried
> running a guitar (aka roughly sine) through the Thomas Henry
> sine shaper, though my gain stage was pretty noisy as what I
> happened to have breadboarded up at the time was another
> effect in progress - got some interesting noises and a
> compression effect at some settings... More tweaking that
> latter.
> >
> > --- On Wed, 11/4/09, cheater cheater <cheater00 at gmail.com>
> wrote:
> >
> >> From: cheater cheater <cheater00 at gmail.com>
> >> Subject: Re: [sdiy] They aren't sawtooths, they're
> ramps
> >> To: "David G. Dixon" <dixon at interchange.ubc.ca>
> >> Cc: synth-diy at dropmix.xs4all.nl
> >> Date: Wednesday, November 4, 2009, 1:30 PM
> >> > Waveforms derived from
> >> relaxation oscillators definitely do not fit the
> >> > bill, and therefore should not be called
> "sawtooth",
> >> any more than some
> >> > random "rounded" waveform should be called
> "sine".
> >> >
> >>
> >> YOU MEAN THE SIGMOID???? :PPP
> >>
> >> On Wed, Nov 4, 2009 at 20:30, David G. Dixon
> <dixon at interchange.ubc.ca>
> >> wrote:
> >> >> snip >
> >> >> > "Ramp" refers to the ramping part of
> the
> >> sawtooth wave, but could also
> >> >> > refer to waveforms where the ramp is
> an
> >> important part of a waveform
> >> >> > that's not really a sawtooth wave.
>  For
> >> example; a wave that starts
> >> >> > low, ramps up, holds there for a
> bit, and
> >> then resets.
> >> >> >
> >> >> > Relaxation oscillators are what they
> are,
> >> they don't define the
> >> >> > sawtooth wave.
> >> >
> >> > I tend to call it a sawtooth when it ramps
> downward,
> >> and a ramp when it
> >> > ramps upward.  However, it seems to me that
> we should
> >> reserve the term
> >> > "sawtooth" for either upward or downward
> ramps which
> >> are linear; i.e., those
> >> > which are generated by a carefully designed
> VCO
> >> feeding a fixed current to
> >> > an integrator with one end of the cap pinned
> to
> >> virtual ground, and which
> >> > can be counted upon to contain both even and
> odd
> >> harmonics with amplitudes
> >> > inverse to their harmonic number.  At least,
> in synth
> >> circles, I think we
> >> > should make this distinction.
> >> >
> >> > Waveforms derived from relaxation
> oscillators
> >> definitely do not fit the
> >> > bill, and therefore should not be called
> "sawtooth",
> >> any more than some
> >> > random "rounded" waveform should be called
> "sine".
> >> >
> >> >
> >>
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> >>
> >
> >
> >
> >
>