Hi Rowland,
In 2008 I found a German language forum discussion concerning the Ducati
regulator. Writer "Arrow" seemed to know what he was talking about.
I reported -
http://www.sarangan.org/www/mhonarc/mharc/html//europa-list/2008-08/msg00133.html.
The 2008 entries have been removed (Rotax did not like them probably)
but I saved the page from cache where you can still find it too probably:
google using "piloten arrow ducati regler".
If not I will attach (34 files, 425 kb).
In any case there is a circuit diagram and it shows L as shorted to
ground via FET when C gets above some voltage, otherwise floating.
Jan de Jong
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