Regarding current flow, it's my observation that engineers use
conventional current flow (+ to -) and technicians use electron current
flow.
        I think it would be nice if engineers and techs talked the same
language.
        I like using conventional current flow since current then "flows
downhill."  I teach electronics technology classes at Cuesta College
(local community college) and have to think backwards, since the text and
other instructors use electron current flow.
        I believe all semiconductor datasheets use a positive number
conventional current flow INTO the pin.  Thus an I/O pin (on a PIC) has a
positive sink current (into the pin) and a negative souce current (out of
the pin).

Harold


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