MOTM

>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.html
close 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.
>