Slightly unrelated, I found a clever power factor meter circuit that does
not use a multiplier as such (it uses a switch based modulator instead).
Has anyone built it or anything to add:

http://archives.e-insite.net/archives/ednmag/reg/1994/042894/09di3.htm

This could be turned around to measure power and power factor and it could
use a PIC with 2 A/D channels. All the other parts together minus the
current transformer should cost $5 or less in ones.

Peter

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