On Tue, 15 Feb 2005 16:45:02 +0100, you wrote:

>
>At 16.36 2017.04.28 -0300, you wrote:
>>    Hi, Omer.
>>
>>   What are your current demands?
>>    If they are 1.5 A or less, you can use the LM317, adjusting the output
>>    voltage.
>
>By the way, can LM317 or, for the matter, 78xx be parallelized for increased
>output current?

Calculate the power dissipation at 1.5A from 30V down to 5 and you will realise that regulator
current rating is the least of your problems. 

You should be looking at a switching regulator - e.g. Nat.Semi SImple Switcher range

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