> The trick to use a 317 is to set up the current through Radj to at least 3
> times Iadj. This way the errors caused by temperature etc become
> negligible.  This is done by choosing an appropriate resistor between out
> and adj.

Well, of course.  The typical application uses a volage divider between the
output and ground, with the middle going off the the "adj" input of the 317
to provide the voltage set point.  In order for this to work easilly, you
need the current through the voltage divider to be much larger than Iadj, or
you'll introduce a lot of error.  Since Iadj isn't tightly spec'ed, or even
(as far as I can tell) guaranteed to be constant over assorted extremities
of operation, I don't think you can just treat it as part of the voltage
divider...

BillW

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics