L.E.D Flashlight

I have seen an advert for an L.E.D flashlight that is activated by shaking it,there are no batteries. How does it work ?

Reply to
geoff smith
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Probably about as well as one can shake it. Maybe Fox could use it on their new dance contest show.

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Reply to
CJT

In message , geoff smith writes

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" It all started back in 1830 when the English physicist Michael Faraday discovered that passing a magnet near a wire coil could induce an electric current in the wire. This "Faraday Principle" forms the foundation for all of today's electric motors, generators, & transformers.

Generation Gear has taken this principle to the next level. We have combined it with two advanced semiconductor devices to create a flashlight that never needs batteries!

Shaking the ShakeLight will cause a magnet to slide back and forth inside the flashlight handle. As it does so, it passes through a copper coil, thereby inducing a current in the coil's wire. This current is then stored inside an electronic component called a capacitor which in turn provides power to the LED (Light Emitting Diode). "

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dave @ stejonda

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Reply to
nospamdeleteabusedave

It's like a reverse vibrator.

N
Reply to
NSM

"dave @ stejonda" wrote in news:08G10IFrzX1CFA$ snipped-for-privacy@privacy.net:

A local TV news consumer segment did a test on these LED lights and found them to not be very useful,nor worth the money.They dim very quickly.

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Jim Yanik
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Reply to
Jim Yanik

I think it would have to be a solar powered vibrator to make the analogy work.

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Reply to
CJT

All they need is an appropriate celebrity to endorse and demonstrate it. Somebody like Michael J. Fox or Muhammad Ali. ;-)

Reply to
James Jones

Actually, the vibrators I've taken apart have a cheap DC motor in them, and then a weight on the shaft that is asymmetrical. So when the motor turns, there is an imbalance, hence the vibrations.

The concept of a reverse vibrator is that if you shake it, you get power, while a vibrator shakes when you apply power.

But since there is a motor in there, it's not a great analogy. Everyone knows that an electrical motor can generate power if you turn the shaft. You aren't likely to be able to rotate the shaft of the vibrator motor by shaking it, so it's not a reversible concept.

Let's not forget those cheap DC motors have magnets in them, and a winding. Not really different from the concept of those flashlights. The difference being the mechanical arrangement. Instead of turning the shaft to get voltage, there is a more free-form generator that works when you shake it.

Indeed, I have a windup LED flashlight, and I assume the only real difference is that I crank it to charge it, rather than shake it.

Michael

Reply to
Michael Black

I played with one in a store once that worked ok, but it did take a lot of shaking to charge it up. Would be good as an emergency backup as the batteries can never go dead.

Reply to
James Sweet

"NSM" bravely wrote to "All" (13 Jul 05 21:34:29) --- on the heady topic of "Re: L.E.D Flashlight"

NS> From: "NSM" NS> Xref: aeinews sci.electronics.repair:53131

NS> It's like a reverse vibrator.

Don't excite the ladies needlessly by using those words, please...

A*s*i*m*o*v

... From small chips to big breasts, silicone is great!

Reply to
Asimov

shaking

And it's very difficult to activate without making an obscene gesture.

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Reply to
Tom Del Rosso

I hear you can go blind if you use it too much also.

Reply to
none

Yeah, the UV output is pretty high.

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Reply to
Tom Del Rosso

STOP right there! Thank you. :-)

Reply to
Allodoxaphobia

Big magnetic going past a coil, generator power to charge a capacitor, that runs the LED

keep away from your credit cards, phone cards or any other card that has a magnetic strip on it.

Reply to
Eric

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