> In the datasheet, it says that the equation to adjust Vout is:
>
> Vout = 1.25 (1 + R2/R1)
>
> In my case, R1 is 220R, and I calculated R2 for three voltage values:
>
> 10V - 1.5K
> 13.8V - 2.2K
> 20V - 3.3K
>
> Is it OK to ignore Iadj*R2 term (as they mention that Iadj is minimized)
> and to only have a 5K potentiometer as R2 ?

The example in the NS data book shows 120 between Vout and
Adj, and a 5k pot from Adj to 0V. A note says 120 for the LM338
and 240 for the LM138. Also a 0u1 on the i/p and 1u on the o/p

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