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I don't recall if AC powered digital clocks use the AC frequency to time themselves (60 hz = 1 second). But they must...Is there anything else on that particular circuit? Cfl's, old fluorescent shop lights (anything with an older ballast), electronics, etc? I know a clock run on modified sine wave (eg from a cheap dc-ac inverter) will make clicks run double-time. Kinda curious on this one...
 
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