[R-390] Possible source for isolation transformers?
Barry
n4buq at knology.net
Wed Jul 4 09:04:47 EDT 2007
I'm curious as just to what's under the hood. I suppose they can get away with calling an autotransformer simply a transformer. If it is truly a transformer, though, I can't see how they can sell them at that price.
If they are autotransformers, is this a better solution for 220V-110V conversion than the little voltage converters available? I belong to a list of folks who have (or will) travel overseas and several ask from time to time about what to use to power their various 120V appliances (chargers, etc.) while overseas. While a small converter is fine for charging a battery or running a small device, I keep having to warn folks who want to power their blowdryers, etc., from them. I thought these might be a better alternative; however, they'd certainly need the 1500W or larger unit for such applications. I know blowdryers are available in 220V models and that's probably the best way to go, but most folks aren't going to do that so I keep looking for better options. I've explained the "best" solution is a step-down transformer, but it's unlikely anyone will want to pack one of sufficient size in their luggage.
I know its OT, but if anyone has any thoughts on this, I'd appreciate a reply either on or off the list.
Thanks,
Barry - N4BUQ
On Wed Jul 4 7:51 , "Steve Hobensack" sent:
>Transformers for this application are almost always autotransformers. They
>are smaller for a given wattage because there is only one winding (with
>tap), and the common part of the winding can be downsized. They will not
>function for isolation. They can be used either for step-up or step-down.
>...Steve...N8YE
>
>Knowing the leaky filters won't run on GFI circuits and are probably not
>all that safe when used on non-GFI or non-isloated circuits, I think
>some folks may be looking for isolation transformers. While searching
>for voltage converters for overseas travel, I found these:
>
>http://www.eastwestintl.com/proddetail.asp\?pid=2625
>
>They state that they are transformers, not just converters, and that
>they can be configured to run either 110-220 or 220-110. I wonder if
>these could also be wired for 120-120 and used as an isolation
>transformer. If not, if someone has 220V in the shop, it might be a
>good way to power an R390[A].
>
>If you back up a page, they have a variety of transformers ranging from
>100W on up.
>
>Just thought I'd pass this along.
>
>Barry - N4BUQ
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