[sdiy] Driscoll synths?

[John Loffink]

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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