On Tue, 25 May 2010 22:29:03 +0100, "Michael Watterson" said:
> >
> > Data sheet for the ATMega48 says optimized for < 10K, and of course
> > the 0~2.5K looking into the wiper (or maybe 0.1~2.6K counting the
> > output drivers and contact resistance) is much less than 10K.
> >
> >
> >   
> Surely a max of 5K = 10K/2  ?
> OK though

No, think of it as two 5k resistors in parallel. Check out Thevenin
equivalent if you are curious.

Cheerful regards,

Bob

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