Unfortunately ray is.. unavailable. you should check his website

anyway, a couple of inputs might also come from here http://www.schmitzbits=
..de/index.html
under the vco section.
there are schematics for a 555 based vco and i have to say despite all the =
issues it sounds really beefy.
but i'd never build one, a saw core vco is trivial to make with a handful o=
f components=20

i also design and build modular synths :)

> From: jmjrock7@gmail.com
> Date: Tue, 23 Feb 2016 16:53:43 -0500
> Subject: Re: [EE] Can a 555 be used as a wave generator?
> To: piclist@mit.edu
>=20
> Hi Lindy,
>=20
> I build Modular synthesizers for a living.
> The 555 square wave certainly can be used for subtractive synthesis.
> If you're looking for tonal stuff the standard is 1V/Oct and that's where
> the problem with the 555 comes in .
> Difficult to scale the control for 1V/Oct.
> Great for Lunetta stuff and noisemakers!
>=20
> There's a bunch of great SynthDIY sites and forums to help get an overvie=
w
> of different architectures of VCOs and VCFs.
> Haha i guess it depends what your end use is really ;)
> If you're shooting for a Moog-Like synth 555 is the hard road to go.
> if you're less interested in traditionally tonal music and just need a
> simple oscillator 555 is great.
> MFOS makes a Weird Sound Generator using 40106 as a fistful of astable
> multivibrators.
>=20
> On Tue, Feb 23, 2016 at 4:15 PM, IVP <joecolquitt@clear.net.nz> wrote:
>=20
> > > Is the square wave that comes out of a 555 something that can be
> > > used, then filtered to make different sounds?
> >
> > Absolutely. Even varying the duty cycle during a note can sound
> > interesting.
> >
> > You can also get a triangle wave from a 555, which is less harsh
> > on the ears than a square wave. A few components can convert
> > the triangle to a sine wave. The Control Voltage pin (5) can be used
> > as a modulating input, for example to make the 555 the basis of a
> > voltage-controlled filter. 4016/4066 switches are put in series with
> > resistors in a typical audio filter and the 555's duty cycle is altered
> > (via CV) to change the tone. Which could be anything from a simple
> > bass-treble control to a sweeping wah sound. The audio source
> > can be another 555
> >
> > With a handful of 555s you could make a small basic old school
> > modular synth - VCO, VCF, VCA, LFO etc
> >
> > I've seen a circuit which used the 555 as (I think) a pulse-position
> > modulator as an audio amplifier. I remember the author said it
> > wasn't fantastically good but demonstrated a principle
> >
> > Have a Google for 555 Cookbook, plenty of odd circuits around
> >
> > Joe
> >
> >
> >
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