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From: cim2@pyuxv.UUCP (Robert L. Fair)
Newsgroups: comp.sys.ibm.pc
Subject: 220V/50hz
Message-ID: <275@pyuxv.UUCP>
Date: Wed, 22-Apr-87 09:57:53 EST
Article-I.D.: pyuxv.275
Posted: Wed Apr 22 09:57:53 1987
Date-Received: Sat, 25-Apr-87 00:28:59 EST
Organization: CHC
Lines: 26

A recent article asked about moving a PC to a 220V/50hz country.

Transforming from 220V down to 120V is no problem - just ensure that
the power transformer is adequately rated.

However, changing the voltage does NOT change the frequency, and 
this can cause many problems (I discovered this when I moved from the
UK, a 220V/50hz country) 

Specifically many electronic devices use the line frequency to  provide a 
timing reference, if this changes timing goes wild, for example my hifi
turntable started going 15% faster when I came here - even though it was
a 120/220V model. 

For PC's, the most likely candidate for frequency problems is the
monitor: some monitors generate the scan/retrace  rate from the line 
frequency, which causes a most unpleasant 'swimming' effect on the screen.
Again, some monitors use an internal clock which is independent of
line frequency, so no problem would arise.

I hope this is some help.

Rob Fair
ihnp4!pyuxv!cim2