> Just some solid-state electronics
Just so you are aware, the Palm V which came out in 1999 had just such a power supply. A bit bigger than 1 inch, but it's a switching power supply and doesn't get warm (i.e. it's efficient).
Just so you are aware, the Palm V which came out in 1999 had just such a power supply. A bit bigger than 1 inch, but it's a switching power supply and doesn't get warm (i.e. it's efficient).