>If it can be connected to the mono output of my several Hammond
>clones and it does its job (I'm interested in the Hammond chorus
>simulation while all additional features may be welcome of course)
>I'm more than interested and I'd take not less than three PCBs
>Enrico Dibennardo (Sicily)
Hi Enrico,
do you consider the sound demos on this site
http://jhaible.heim.at/scanner_vibrato/jh_scanner_vibrato.htmlclose enough for an emulation?
(If you consider that the input signal isn't from a real Hammond;
I've put a "dry" clip there for comparison, such that you can get
an impression what the scanner vibrato effect does.)
Best Regards,
JH.
--- In motm@yahoogroups.com, "JH." <jhaible@...> wrote:
>
> Thinking about future pcb projects ...
>
> One thing I wanted to do for a long time is a stereo chorus based
on my
> electronic emulation of the Hammond Scanner Vibrato.
>
> I've built something like that a few years ago:
>
> http://jhaible.heim.at/scanner_vibrato/jh_scanner_vibrato.html
>
> This was purely intended to be an emulation of the Hammond
Chorus/Vibrato
> effect, but I always thought it would also make an interesting,
more
> general, and stereo, chorus device.
>
> That would be a "true analogue" chorus in a different sense than
the
> BBD-based effects, because the signal is not sampled.
>
> It's not free of side effects, thou. It has a somewhat rough
modulation
> waveform, as instead of changing a delay time continuously, it
interpolates
> between 9 taps of a 1ms analogue delay line. It's a linear
interpolation,
> not a switching - best thing is you listen to the sound samples
and decide
> for yourself. It's very rough (in a Hammond-ish way!) for vibrato,
and
> increasingly smoother when the dry signal is mixed in for chorus.
>
> It's a quite complicated method to crate a simple chorus, compared
to a BBD
> circuit. It requires a 50-pole (fifty!) low pass filter, but that
can easily
> be built from 25 cheap inductors (less than a dollar per piece at
Mouser)
> and 25 capacitors.
>
> On the positive side, it's a lot more "direct" sounding than a BBD-
based (or
> digital delay based) chorus, as the maximum delay time thru the
whole
> circuit is only 1ms. (Speak of latency ...)
>
> If there's enough interest, this could be a project for a future
PCB
> development. I wouldn't restrict this to Hammond emulation, but
make a
> mono-in / stereo out device in the fashion of many Roland / Boss
dual-BBD
> chorus circuits. Just without BBD. Let me know what you think ...
>
> JH.
>
> PS: this is not to be confused with my Interpolating Scanner,
which is
> planned to be a future MOTM module.
>