SynthModules

But doesn't the PSIM and it's Basic support a function (name escapes
me at the moment) to produce square wave in the audio range through
the Aux out?  As I recall, you can get it to actually output two
waves, each at it's own frequency, mixed.  Some futzing necessary at
the output for buffering and filtering required, but maybe good enough
for fun noises?

Mike

--- In SynthModules@yahoogroups.com, "john mahoney" <jmahoney@g...> wrote:
> ----- Original Message ----- 
> From: "grantrichter2001" <grichter@a...>
> >
> > Since it is summer, I have been working on my Vespa's and not
> > spending time in the dungeon. But I did get some results before
> > the nice weather set in.
> 
> As the South Florida summer intensifies, we *try* to spend more time
in the
> cool dungeons. Anyway, I don't get it -- what's a PSIM doing on a
Vespa? ;-)
> 
> 
> > When the 40 pin version of the Basic Atom Pro comes out, you
> > could add parallel DAC output. That will up the output rate by a
> > whole lot and get the processor up into the audio range.
> 
> The PSIM-2, perhaps?
> 
> 
> > The 12 bit resolution of the DAC means each output step is 2
> > millivolts. For most applications, that amount of zipper noise
> > should be inaudible (inaudible stepping).
> 
> There is 2mv resolution at full strength. When you attenuate the PSIM's
> output, though, you also decrease the variation per step, i.e. you
increase
> the resolution. Attenuating by 50% yields 1mv increments, for example. A
> PSIM-generated LFO routed through a mod wheel or joystick will
typically be
> so attenuated that the steps will be fractions of a millivolt.
> 
> When you don't need the full output range of the PSIM, you can
control the
> output in 2 ways: within the PSIM (by scaling the output values
within your
> program), and externally (using an attenuator or mixer). Each method
has its
> place.
> --
> john