Martin K wrote:
> So calculating the power factor could be done quite easily on an 18F
> however THD would require a FFT to calculate the sum of powers at
> frequencies above the fundamental.

Calculating power factor should be possible on a 18F since its mostly a few
multiplies per sample.  Calculating total harmonic distortion doesn't
require a FFT, although that's one way.  You don't need to know the full
spectrum to calculate THD, only how much power is in the fundamental and how
much everywhere else.  There are simpler ways of doing that than a FFT.


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