D1 Service manual

ok,
not a self made board like yours, but ... (thanks to Spencer)

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@ZM,
yes it makes really fun with the D1, tanks!

@Danger Mouse,
yes to Hoffman and the construction of my D1 has been a long time ago (think it was around 2009/2010). i don't know if he is still in business.
All my newer tranforators comes now from Müller / Rondo.