[Novalug] [OT] Not so silly question

Rich Goodwin rich.goodwin@cox.net
Fri Jun 1 22:15:26 EDT 2007


Sorry - I was referring to the transformer that is with the AC
chargers..... 'course I may be using the wrong term .... I thought th e
units transformed AC to DC here ...

The questino might be better asked -  do all USB chargers outpit the
same? to a USB power charging standard?

Rich

On Fri, 2007-06-01 at 21:47 -0400, Nino Pereira wrote:
> I'm almost certain that a typical a USB device doesn't
> have a transformer that is directly connected to the
> USB port. The reason is simple: the USB port
> gives a constant voltage and current, DC, and that doesn't do anything
> in a transformer (except heat it).
> 
> In principle you could have a small DC to DC converter.
> One type makes an oscillating current, feeds this into
> a transformer, and then rectifies it again. High voltage
> DC to DC converters may simply increase the voltage with
> some diodes in series. But, none of this works with DC.
> 
> HTH,
> 
> Nino
> 
> Rich Goodwin wrote:
> > <sheepish grin>  If a device charges via USB, would any USB charger
> > suffice???  There's alot of devices out there that use USB as the
> > charger.  Since each has some transformer, I'd presume (I hate the other
> > version - assume) they would stay within standard USB charging specs.
> > 
> > Can anyone clarify??  I'm ready to buy a Palm TX (my Zaurus is appearing
> > to show signs of aging - it lost data when changing batteries) and it
> > uses USB for charging... since I have an iPod Nano, Motorla RAZR, .....
> > can I use the existing charger(s)???</sheepish grin>  
> > 
> > Rich
> > 
> > 
> > 
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> > 
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