Many phone charger's I've seen are fancier than standard unregulated
transformer wall warts. They usually seem to be a regulated switchmode
supply in a tiny package. Since it is rated for 1.7A I would guess
this is what he has.


On 5/11/05, John J. McDonough <mcd@is-sixsigma.com> wrote:
> ----- Original Message -----
> From: "Lindy Mayfield" <Lindy.Mayfield@eur.sas.com>
> Subject: RE: [EE] Will phone charger work as a 5v DC power supply?
> 
> > I checked it with the multimeter and it shows 5.1 volts DC.
> 
> Wow.  If it's 5.1 volts unloaded, then maybe it is regulated.  Do you have a
> scope to see what kind of ripple you have?  I think you said that it was
> rated for 1.7A.  That's a pretty hefty wall wart.  You might try loading it
> with a resistor and see whether the voltage stays in the 5 volt
> neighborhood.  Keep in mind the power ... it's pretty easy to make those
> 1/8th watters light up.
> 
> --McD
> 
> 
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