How to use LM3 17 to convert input 5V power supply into output 3V power supply to build a circuit?

Please look at the attached drawings. R 1？ Can you use it? 1k ohm? Resist? R2？ Use? 1.4K？ Left and right resistance

Vout？ =? 1.25? *? ( 1? +? R2/R 1)？

Input-output pressure difference? As long as it exceeds? 1.2V，？ Use? LM3 17？ No problem,? 5V？ -? 3V？ =? 2V？ ,? No problem.

===========================================================

Where to? On the second floor? LED0592？ ：

R 1？ Use? 1K？ What does it matter, Walter? =? 1.25? *? ( 1? +? R2/R 1)？ +? Iadj？ *? R2

Iadj？ Small? Less than? 50uA，？ Right? Vout？ Limited influence, there is no need to be less than? 200? Ohm? about

How far are you? How dare you make a fool of yourself? LM3 17？ What is the output capacitance of the? 1uF，？ It's a little small. But the problem won't be too big. You speak a little too choked up.

Every time you answer, or you can't answer clearly, Or do you want the questioner to think for himself? Then you have to answer? Or criticize the questioner? Don't even understand this? Don't even understand this? I think it's you who really don't understand, right? I suggest you go back and practice again? 50? Year? Out again, huh? Don't come out and make a fool of yourself