[sdiy] Driscoll synths?

[mark verbos]

is the pulse wave a fixed pulse width or does it change with the sweep
too? Is the circuit based on the tripple waveshaper one. That is a 3900
that turns a saw into a sine. Maybe it then gets louder and louder until
it's a square? Just a thought....

mark

John Loffink wrote:

 >The Serge NTO does not have an interpolating scanner for the variable
 >waveshape.  The design actually transforms the waveshape from sine to
 >saw to square to pulse.  Note that these are just approximations.  The
 >square and pulse are never as sharp edged as normal comparator derived
 >waveforms.  The sine and sawtooth are also not your typical pure
 >waveforms. I haven't opened mine up to see what chips are used.
 >
 >Wavemakers had the earliest synthesizer interpolating scanner, in their
 >308 Triple Bandpass Filter and later the 652 Dual Voice Subsystem.  It
 >uses a 3080, a few resistors and a transistor or diode for each stage.
 >They called this a "lap generator," probably derived from "overlap." See
 >my link below for more Wavemakers information.  They had many
 >interesting ideas for their time.
 >
 >John Loffink
 >jloffink at austin.rr.com
 >
 >The Microtonal Synthesis Web Site
 >http://www.microtonal-synthesis.com/
 >
 >The Wavemakers Modular and Integrated Synthesizer Web Site
 >http://www.wavemakers-synth.com/
 >
 >
 >
 >>Have any of you people come across any synthesizers made by Julian
 >>Driscoll?
 >>Of particular interest are any that a Serge based, as is the one
 >>
 >>
 >example I
 >
 >
 >>have seen. This thing is too well made to have been a one-off. For a
 >>
 >>
 >start
 >
 >
 >>one-offs usually don't have version numbers!
 >>
 >>Also, for any that know, does the Serge NTO use a series of LM3080 as
 >>
 >>
 >the
 >
 >
 >>active elements in the integral interpollating scanner?
 >>
 >>Ken
 >>
 >>
 >>
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