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Topic: Introduction from a new member
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David Pannell
Phenomenal Film Handler
Posts: 1072
From: Horsham, West Sussex, UK
Registered: Nov 2004
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posted August 20, 2005 04:28 PM
Not a problem, Jan, unless you're using any synchronous devices like clocks etc. Other equipment with brushless motors usually have a 50/60Hz changeover device anyway which effectively alters the number of salient poles, or else alters any gearing ratio. Other than that, normal domestic appliances are not frequency conscious and things like Hi-Fi cassette decks and CD players etc. usually have their own internal frequency generators and don't rely on the mains frequency. If they do rely on the mains frequency, you can usually alter the drive belt pulley ratio, as on some turntable and cassette decks. The direct drive ones are the ones with their own frequency generators and are often pulse driven.
Good question, though. Nice to know somebody's on the ball!
Cheers,
Dave.
-------------------- Dave.
Valves and celluloid - a great combination! Early technology rules OK!
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David Pannell
Phenomenal Film Handler
Posts: 1072
From: Horsham, West Sussex, UK
Registered: Nov 2004
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posted August 21, 2005 10:13 AM
Yes. I agree. Having checked the actual speed difference of a couple of projectors (with the frequency switching facility) between 50Hz and 60Hz, using a stroboscope, the actual difference at either 16fps or 18fps is around 3fps. (83%). Therefore, using a mains frequency dependent projector designed for 60Hz, will run that much slower when connected to a 50Hz supply.
Remember, though, that many high quality projectors, like the GS, have a variable speed control anyway, and therefore this difference can be easily compensated for.
There's usually an answer for everything!
You pays your money and takes your choice.
However, my professional expertise is really in the field of electrical power engineering. If anybody wants to follow this thread further from the electronics standpoint, I would think that Rick Skowronek would be the man. He has proven his professionalism in the area of electronics time and time again, and I would bow to his superior knowledge.
Cheers,
Dave.
-------------------- Dave.
Valves and celluloid - a great combination! Early technology rules OK!
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