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http://modzer0.cs.uaf.edu/~dan/powermeter
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http://dev.emcelettronica.com/ac-powe...-line-filter-homemade-circuit-breaker
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http://jarv.org/pwrmon.shtml
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http://openenergymonitor.org/emon/node/54
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http://www.electronics-lab.com/projects/oscillators_timers/020/index.html
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http://www.neufbox4.org/forum/viewtopic.php?id=794
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http://wwwhome.cs.utwente.nl/~ptdeboer/misc/mains.html