The converter enables a mains voltage with unstable frequency to
be converted to one with quartz-crystal stability. It may also be
used to convert the mains frequency from 50 Hz to 100 Hz or to
25 Hz. It enables low-power equipment that needs an accurate
mains voltage frequency to be supplied from an inexpensive 230 V
inverter (driven, say, by a 12 V car battery).
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