Re: Printer AC Adapter voltage ? Message #2 Posted by Viktor Toth on 19 Oct 2001, 10:07 a.m., in response to message #1 by Pavel Korensky
If memory serves me right, the idle voltage of these adapters is around 10.7 VAC. The 8 VAC nominal output is at the rated current; since the small transformer runs near saturation, the voltage drops quickly as the load increases.
For the printer, too strong a transformer may mean excessive charging current, wearing out the battery pack prematurely. (Of course the simplistic charging circuit does that already even with the standard adapter, but that's another matter.)
For the HP-IL interface, I _believe_ (hope you don't mind that I am not taking one apart just to check!) that it uses a standard 7805 internally for voltage regulation, which means that it can accept a wide range of input voltages without damage.
Viktor
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