I still don't fully understand what I should expect from this module. I
listened to the sample file in the yahoo group archive, and since I don't
know what the original signal was, I can't glean much insight.
Since you said that an oscilloscope can help choosing an op-amp that does
the right thing, here's a screen shot of a square wave run through my
Grinder section, with both controls set to their middle position:
http://studionebula.com/images/CGS-WM-graph.jpg
Here's an audio file of its output, same square-wave input:
http://studionebula.com/sounds/modular/CGS_WM_test.mp3
In this file I start with both controls rotated fully CCW. I turn one all
the way up and then all the way back down, then the other all the way up and
all the way back down, then one up to its middle position and leave it
there, then turn the other up to its middle position. If you can't tell
which knob is which, then you're understanding my point. :-)
Thanks in advance to any other Wave Multiplier owners who can take a
look/listen to these files and tell me whether or not mine seems to be
operating properly.
--Adam
listened to the sample file in the yahoo group archive, and since I don't
know what the original signal was, I can't glean much insight.
Since you said that an oscilloscope can help choosing an op-amp that does
the right thing, here's a screen shot of a square wave run through my
Grinder section, with both controls set to their middle position:
http://studionebula.com/images/CGS-WM-graph.jpg
Here's an audio file of its output, same square-wave input:
http://studionebula.com/sounds/modular/CGS_WM_test.mp3
In this file I start with both controls rotated fully CCW. I turn one all
the way up and then all the way back down, then the other all the way up and
all the way back down, then one up to its middle position and leave it
there, then turn the other up to its middle position. If you can't tell
which knob is which, then you're understanding my point. :-)
Thanks in advance to any other Wave Multiplier owners who can take a
look/listen to these files and tell me whether or not mine seems to be
operating properly.
--Adam
> -----Original Message-----
> From: sasami@... [mailto:sasami@...]
> Sent: Sunday, September 25, 2005 3:58 PM
> To: cgs_synth@yahoogroups.com
> Subject: RE: [cgs_synth] Finally! The Wave Multiplier is built.
>
> Basically the grinder is exploiting exactly what you DON'T want in a
> typical
> servo system (such as the feedback of an op-amp. It causes the op-amp to
> overcompensate, then overcompensate in the reverse direction etc,
> effectively causing a high pitch ringing on the output wave. If you have
> an
> oscilliscope, it can help choosing a chip.
>
> Ken
>
>
> >I am also happy with my recently completed Wave Multiplier, although I am
> >somewhat non-plussed by the Grinder section. It seems that its two
> controls
> >have basically the same effect on the timbre, although with slightly
> >different ranges of operation and some interdependence. It also sounds
> more
> >like a resonant filter than something I'd describe as a "grinder". Do
> other
> >Wave Multiplier owners observe similar behavior in their grinders, or is
> >there something wrong with mine?
> >
> >--Adam
> >
> >
> >
> >
> >
> >
> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
> _______________________________________________________________________
> Ken Stone sasami@... or sasami@...
> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>
>
>
>
> The CGS Modular Synth home page: http://www.cgs.synth.net/
>
> Yahoo! Groups Links
>
>
>
>
>
>
>