> i don't know if thats a good idea.
> there were some rantings in the past regarding the diy
> designs of juergen haible and how they probably found
> their way into commercial products. i don't know how much
> of all these stories were fact or fiction, but others may
> have strong opinions about that. i suggest that modules
> which were posted as "diy projects" should stay
> "diy projects", until the designer of that project
> (in this case juergen haible) decides to give his
> design away for a commercial product.
>
> i agree that such a module could be interesting,
> but i don't see a need to copy other designs for it.
> i'm sure that dieter can design a module like that on
> his own, without using a diy design from another person.
>
> best wishes
>
> ingo

I designed such a module in the eighties called "String Phaser". But as the
BBDs were very expensive that time I used three phasers instead of BBDs to
generate the effect. But the modulation source was exactly the same:

One LFO which had available three triangle outputs with 120 degree phase
shift in between and a second (faster) LFO. The LFO signals were mixed to
obtain three control voltages to control the three phasers (or BBD modules
instead of the phasers).

The circuit is published in a hidden directory on our website
(.../history/string_lfo.gif) because somebody else was asking a few weeks
ago. We are about to scan all older documents (schematics,
user's/construction manuals, brochures/prospectus, price lists ...), little
by little and publish them in this directory. It would be no problem to rise
the string LFO from the death but I think it should have a little more
features that the old design (e.g. adjustable frequencies and depth for both
LFOs and maybe four instead of three outputs).

Best wishes
Dieter Doepfer