>                  5.5V
>                   |
>                   |
>      -------------o
>      |            |
>      \            |
>      /470         |
>      \            |
>      |    10      |
> PIC--o---\/\/-- FET
>                   |
>                   |
>                   |
>                  Vcc to circuit

                   3.3V
                    |
                    |
       -------------o
       |            |
       \            |
       /470         |
       \            |
       |    10      |
  PIC--o---\/\/-- FET
                    |
                    |1N4001
                    --|>|-----  Vcc to circuit


Craig