You can get packages of several (often 5) "DC-DC Step-Down Buck Converters" on Ebay, usually for $2 or so a piece. Most will do the 2-3 amps you need ... see individual specs. Am powering my Pi with one now, using a 12v supply. These little step down DC converts often have a brass screw, with which ...

Joan: My experience with the WiringPi library is, indeed, that 4 PWM pins are addressable, but only 2 are unique. The gpio utility, as well as with C library yield the same results. Pins 33+35 (bcm 13+19, wpi 23+24) reflect identical signals, as do Pins 12+32 (bcm 18+12, wpi 1+26). To put too fine a...