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Patrick Leonard <transactoid@rogers.com> wrote:
You need to look up Nikola Tesla, that was his gig around the turn of the
(20th) century.
DLC
: Subject pretty much says it all........is it possible to light an LED
: (continuously, or pulsed) from an antenna ONLY (only power source, that
is)?
: Does anyone know of any schematics for building such a circuit?
--
============================================================================
* Dennis Clark dlc@frii.com www.techtoystoday.com
*
* "Building Robot Drive Trains" published by McGraw-Hill 2002
*
============================================================================
I DO know Tesla's work quite well, and I realise my reply was misleading. IClearly, you do not understand Tesla's work at all! He was not some
sort of
"free energy" idiot like the many drooling, credulous followers of his
work. He
transmitted power and extracted it at a distance. The reference was meant
to
point out that radio waves are sometimes used to do this.
Well, this is what I have been experimenting with using a plasma ball (seeNot unless you are right by the antenna. A few turns of wire can
sometimes
do the trick, and the LED acts as the rectifier. Imagine that you have a
full
wave antenna. At either end of the antenna, when immersed in an RF field,
there
will appear an AC signal that oscillates at the carrier frequency. Now,
if the
LED were wired to each tip of the antenna, it would "see" the voltage
potential
that exists across the tips of the antenna.
Now, wind it up into a coil so it is smaller. It will not be as
efficient
but it will still develop a voltage potential that is applied to the
terminals
of the LED. Just to protect it in strong RF fields, place another LED in
anti-parallel (or a small diode) to short out the reverse current. And if
you
make a tuned circuit with a small capacitor, it can actually "store" a
small
amount of power and then act as a resonant element- giving you a bit more
light.
Think of two identical tuning forks placed a short distance apart. If
you
tap one and then stop its oscillations with your hand, you will hear a
faint
sympathetic oscillation from the second. You have induced it to ring.
Tuned circuits can do this as well; resonance is the key to
efficiency.
Make your coil your tuned circuit. That is what many RFID tags do.
Cheers!
Yeah, you just bend the LED leads in the shape of a dipole antenna.Subject pretty much says it all........is it possible to light an LED
(continuously, or pulsed) from an antenna ONLY (only power source, that is)?
Does anyone know of any schematics for building such a circuit?
Your average local radio station has millivolts of signal strength,I'm familiar with the work of Tesla; no this question was not an attempt at
any kind of free energy extraction.
I'm just curious if radio stations (and other sources) produce enough RF
that an LED, with a suitable antenna, could be lit.
--"Dennis Clark" <dlc@io.frii.com> wrote in message
news:3f29cace$0$194$75868355@news.frii.net...
Patrick Leonard <transactoid@rogers.com> wrote:
You need to look up Nikola Tesla, that was his gig around the turn of the
(20th) century.
DLC
: Subject pretty much says it all........is it possible to light an LED
: (continuously, or pulsed) from an antenna ONLY (only power source, that
is)?
: Does anyone know of any schematics for building such a circuit?
Done that half a kilometer from a major AM transmitter site. String outI'm familiar with the work of Tesla; no this question was not an attempt
at any kind of free energy extraction.
I'm just curious if radio stations (and other sources) produce enough RF
that an LED, with a suitable antenna, could be lit.
Oh Dear! I've one of those cell-phone cradles with a black-blob flasherIn article
_zjWa.34551$hOa.11712@news02.bloor.is.net.cable.rogers.com>,
transactoid@rogers.com mentioned...
Subject pretty much says it all........is it possible to light an LED
(continuously, or pulsed) from an antenna ONLY (only power source,
that is)? Does anyone know of any schematics for building such a
circuit?
Yeah, you just bend the LED leads in the shape of a dipole antenna.
Somewhere I read about using just such a device to find out if your
microwave oven is leaking microwaves around the door. You just dim
the room lights, and put a cup of water in the microwave and turn it
on high. Then hold the LED with its legs bent like an antenna next to
the door edges, and see if it lights up.
If it does, then you got a problem!
Tsk-tsk..Watson A.Name - 'Watt Sun' wrote:
In article
_zjWa.34551$hOa.11712@news02.bloor.is.net.cable.rogers.com>,
transactoid@rogers.com mentioned...
Subject pretty much says it all........is it possible to light an LED
(continuously, or pulsed) from an antenna ONLY (only power source,
that is)? Does anyone know of any schematics for building such a
circuit?
Yeah, you just bend the LED leads in the shape of a dipole antenna.
Somewhere I read about using just such a device to find out if your
microwave oven is leaking microwaves around the door. You just dim
the room lights, and put a cup of water in the microwave and turn it
on high. Then hold the LED with its legs bent like an antenna next to
the door edges, and see if it lights up.
If it does, then you got a problem!
Oh Dear! I've one of those cell-phone cradles with a black-blob flasher
circuit that goes off when the phone rings - it flashes if stood on top of
the operating microwave (on the steel case). Thinking even thin steel would
stop any harmful radiation, I've put this down to some less nasty form from
the transformer...