SV: Re: [sdiy] Hopf bifurcation VCOs

[karl dalen]

LOL.

A sine, a cosine, a triangle and a folded sine or triangle! :-)

Sounds like whisteling without noise! :-)

Quite boring! :-)

But you can FM it! :-)

Comic relief award! :-)

KD

--- Jonathan Lutz <jonathan.lutz at gmail.com> skrev:

> As a musician -
> 
> How does it sound? What type of waveforms are generated? I am always looking
> for unique sound sources...
> 
> JON
> 
> On 11/11/05, JH. <jhaible at debitel.net> wrote:
> >
> > > The oscillator runs easily to beyond 30kHz. At that frequency there is
> > > some increase in amplitude, probably due to opamp phase shifts.
> >
> > As long as both outputs increase in the same way, it's ok for a
> > frequency shifter.
> >
> > >
> > > At the low end, I checked operation at 0.5Hz. Here there is an
> > interesting
> > > issue. On power-up it takes the system about 2 minutes to build up to
> > full
> > > amplitude with both nonlinear circuits in place, and about twice that
> > with
> > > just one, as in the posted schematic. However, once the system is
> > running
> > > it changes frequency rapidly when the control current is changed,
> > probably
> > > because the quadrature phase relation is already established. So I think
> > > it can be swept OK.
> >
> > This is good news!
> >
> > > It should be fairly simple to make a kickstart
> > > circuit to ensure things get running at power up.
> >
> > Yes, either force a high frequency on power-on, or a stronger
> > nonlinearity,
> > or maybe even both.
> >
> > JH.
> >
> >
>