[EMS Discuss] radio wave power question from Joshua

Darrell Perko dperko at efn.org
Fri Jan 24 17:12:26 PST 2014


Joshua may be referring to microwave frequency.  I've seen an LED lit 
with that on youtube.  Much smaller antenna, too.

On 1/24/2014 4:22 PM, Rick Osgood wrote:
> Do you mean you can power an LED from radio waves like from a radio 
> station?  I wouldn't think that would even be enough to power an LED 
> but I'm not really that knowledgeable on the subject to be honest.
>
> You can charge cell phones and toothbrushes (and power LEDs) using 
> inductive charging, but that's a bit different and it requires pretty 
> close proximity to the charger in order to be efficient.  If you are 
> talking about wearing a watch around all day and having it powered 
> from the stray radio waves then I'm not sure.
>
>
> On Fri, Jan 24, 2014 at 4:15 PM, Elizabeth Phelps <lizphelps18 at aol.com 
> <mailto:lizphelps18 at aol.com>> wrote:
>
>     Hello,
>     I was wondering, if you can power an LED with radio waves, do you
>     think you could power a watch that way?
>     Thanks,
>     Joshua
>
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