Which regulator for 30V DC to 5V DC

Other Hardware General Electronics
5

there are lots of dc to dc boards on ebay like this, very cheap my advice is find what chip it is and make up the circuit you will learn so much from doing it.

http://www.ebay.com/itm/LM2596-DC-DC-3-2-40V-to-1-5-35V-Step-Down-Adjustable-Converter-Power-Module-/271458822487?pt=LH_DefaultDomain_2&hash=item3f3434e957