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Mains Power Frequency


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#1 John Sprung

John Sprung
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Posted 30 November 2010 - 08:24 PM

This is too interesting not to pass along:

http://www.dynamicde...co.uk/grid.htm#

In the old days, we used to use synchronous motors on the cameras and optical sound recorders to maintain sync. It only worked because they were both on the same source, which it's clear from this, still drifts too far to work with crystal devices.





-- J.S.
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#2 Phil Rhodes

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Posted 30 November 2010 - 08:57 PM

My father tells amusing tales of people sitting watching hum bars, tweaking a generator throttle to keep them out of the visible picture area during off-grid OBs.
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