[sdiy] Hammond Vibrato Scanner

[Tim Parkhurst]

On Dec 31, 2007 10:25 PM, David Brown <davebr at earthlink.net> wrote:
> I've always wondered what a Hammond vibrato scanner would be like
> interfaced to a modular synth.  I rebuilt a spare B-3 scanner and
> "jury rigged" it up today. The sample has some noise in it but does
> make a nice vibrato.  I'm thinking of trying it with various
> waveforms instead of just the delay line taps.
>
> Any else on this list tried anything with a vibrato scanner?  I'm
> thinking that if I come up with a nice variable-speed DC motor drive,
> I could drive a "Circle Machine" for the ultimate mechanical module.
>
> http://modularsynthesis.com/modules/DJB-scanner/scanner.htm
>
> Dave
>

Hey Dave,

The vibrato/chorusing sound is rather nice, but I can hear a distinct
"stepping" or clicking as the rotor moves from one set of plates to
another. This is especially evident as you slow the rotor down. Could
you possibly increase the cap values to reduce the clicking? At the
higher rotor speeds, I think this is a good part of the noise you're
hearing.

This is a fascinating project, and I can see why you're interested in
pursuing it, but I can't help thinking that the same effect could be
acheived much more easily with a good chorus unit. :-0


Tim (clicking my way into 2008) Servo
-- 
"Imagination is more important than knowledge." - Albert Einstein