Just counting - in my music room I have 14 of these, mostly at 12v, some at 9v, one at 18v and one at 24v. If you end up with an easy to follow circuit diagram, I'd be interested to see it, if that's okay?
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock