--- In quizbowl_at_yahoogroups.com, cooterchekov <no_reply_at_y...> wrote:
> --- In quizbowl_at_yahoogroups.com, jp_lien <no_reply_at_y...> wrote:
> > You see, a crystal radio doesn't need power because it merely
> recieves
> > radio signals. The buzzers would have to transmit information to
> the
> > host system, and hence would require transmitters. Transmitters
> > require power. Unless you're planning to somehow transduce the
> energy
> > from the buzzing motion (which probably wouldn't be enough to
> > communicate at RF), you need batteries.
> >
>
> Um. Radio signals carry energy. Otherwise they couldn't do work on
> the antenna.
Yeah, so it takes energy to make them, QED. Think twice before taking
an EE-type person to task on circuit design.
Peter
Not an EE-type person