Don Foreman wrote:

On Fri, 01 Feb 2008 20:37:00 -0600, "Martin H. Eastburn"
wrote:

Why not a voltage regulator or better yet - a 12V DC to 6V DC switcher.
There are lots of power supplies like this about the size of a hand
or less.

Martin

Might be a radio noise issue with an AM radio. Some of the "simple
switcher" chips are very easy to use, though. I've built little
switchers by epoxying parts on the back of a wallwart -- no circuit
board at all, just haywire things and then glop 'em good.

AM radio???

Certainly a switching supply would be more efficient than a linear.