You need a dual H-bridge motor driver. Mosfet ones are best, they run cool and have low voltage drop. I suggest something like http://www.pololu.com/catalog/product/1213. The motor shield from Rugged Circuits looks good to me too.
You need a dual H-bridge motor driver. Mosfet ones are best, they run cool and have low voltage drop. I suggest something like http://www.pololu.com/catalog/product/1213. The motor shield from Rugged Circuits looks good to me too.