On Sun, 3 Nov 2002, Jinx wrote:

*>> Wherever you get that.

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. Since the voltage is constant (nominal 1.2V) you set a current
using the resistor which will flow through Radj. F.ex. 240 ohms is very
popular (5mA nominal ~= 100 times Iadj). Also 2k4 or 2k2 (10 times Iadj).
The bottom line is that the current through Radj will be constant. Note
also the minimum load requirement. 240 and 470 ohms between out and adj
fulfill this requirement, 2k4 does not.

Peter

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