Need help with a voltage regulator

[buickid]

I'm trying to build a voltage regulator, as the title states. I've got a 12-cell, 14.4V Ni-MH pack. Fresh off the charger it reads 16.8V. I need to get this down to 13.8V or so, although an acceptable range would be 12-14.4V. The device used with this may draw 7-8A at full power. Any help in building a voltage regulator would be appreciated. I am fairly good at soldering, and have a pretty decent knowledge about electronics.
-Trevor

 

[jason 77]

Would something like this work?

http://www.zen22142.zen.co.uk/Circuits/Power/1230psu.htm

 

[buickid]

Hmm maybe... How would I modify this for something like... 10A?