Paul UK:
"Modern digital clocks aren't generally a problem as they are timed from an internal crystal reference,"

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The cheap digital clocks that come with those $10-$15 clock-radio combos you buy in a drug store or discount store still take their reference off the line frequency.

I have two 220 Volt/50 hertz digital-clock radios (one is a Malaysian Grundig and the other is a Roberts for the UK market).

Both clocks run fast when plugged into a 220 volt/60 hertz source (I run them through a small step-up transformer). Too bad... I like the Grundig's tuner and sound quality but it's no good for waking me up in the morning. [Linked Image]

I once saw a no-name generic clock radio with a 50/60 hertz switch next to the 110/220 volt switch...that seemed like a good idea. Wonder how that worked....there was no crystal inside the clock section (I bought it and took it apart).

Japan also has both 50 hertz and 60 hertz power supplies (depending on what half of the country you're in).

Northern Japan (Tokyo, Sapporo, Kawasaki, etc.) has 100 volts/50 hertz and Southern Japan (Osaka,Hiroshima, etc.) is at 100 volts/60 hertz.

[This message has been edited by SvenNYC (edited 12-02-2002).]