In light of this discussion, I have two questions.

     (1)  How would I get a PIC to interface with the A/C (120V) line
     frequency?

     (2) If I have A/C anyway, is there a inexpensive way (i.e. less than
     the cost of a AC/DC adapter) to convert A/C to a DC in the PIC
     operating voltage?

     -Edwin


______________________________ Reply Separator _________________________________

Don't overlook line frequency as a good long term standard. Utilities
keep an awfully good average frequency so that there aren't any problems
with synchronization in the power grid.

-- Tom