Re: Using a US Lisa in the UK -- redux!

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Hi Tom,

Afaik, switching PSUs are quite permissible for frequency variations. I have several US (120V 60Hz) and JP (100V 50 or 60Hz) and used a simple transformer here in Spain (220V 50Hz), and never had a problem.

Normally when clocks, specially the RF modulator or CRT, are directly dependable on power line frequency, what you get is a slower machine/monitor. Different things are AC motors as they will go slower, unless they're DC motors with diodes.

But take my comments as a simple opinion of what I've done, I'm just not the right kind of engineer for this problem :p

Also all I've found elsewhere is that everything (but AC motors) just works, but gets hotter/cooler when you change their input frequency.

El 12/12/15 a las 0:23, Tom Stepleton escribió:
> Thanks for the thoughts everyone. Please rest assured that I have
> no intention of damaging my Lisas or myself :-)
>
> It would be great if a 240V to 120V stepdown transformer would do
> the job---and maybe it will! The one thing I'm worried about is the
> current frequency. The USA uses 60Hz, while UK wall current is at
> 50Hz.
>
> Stepdown transformers will change the voltage without trouble, but
> they can't change the frequency. Meanwhile, the data plate on the
> back of an American PSU is pretty specific:
>
> 120 VAC *60 Hz* 1.2 Amp 150 W
>
> It could be that the PSU can handle 50 Hz and they just didn't mark
> it that way---there aren't too many places where you'll find 1x0
> VAC at 50 Hz (unless x == 0, and they didn't sell many Lisas in
> Tokyo...).
>
> So, has anyone tried running Lisas and ProFiles at 50 Hz on a 240V
> to 120V stepdown transformer? Is that something that should work at
> all?
>
>
> Other notes:
>
> The UPS idea is not a bad one, but when ordinary UPSes are plugged
> into a wall, I think they tend to emit the same line frequency as
> what comes in. Take this one
> <http://www.apc.com/shop/us/en/products/APC-Power-Saving-Back-UPS-Pro-
1500/P-BR1500G>
>
>

for example (see the Technical Specifications tab)---output frequency is
> "sync to mains". Worst case, I guess I could plug the UPS into the
> wall to charge it up, then unplug it and use the computer for a
> little bit, I guess.
>
> There are converters that can turn 240V 50Hz to 120V 60 Hz, but if
> you want something strong enough to power a Lisa/ProFile combo, I
> think you need to spend a whole lot of money---thousands.
>
> --Tom
>
>
> On Friday, December 11, 2015 at 11:14:29 PM UTC, rh jannini wrote:
>
> Tom -
>
> Here is an idea that might work - don't do anything to the Lisa -
> use a UPS (US) and deal with the UK conversion at the outlet. You
> gain the benefit of protecting the electronics and preserve the
> original PSU.
>
>
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