Flash Light Based On Faraday's Induction Law.

D.J.

New Member

• Jun 12, 2005

• #1

Hi,

Has anyone seen those new flashlight that work off a little coil and magnet.

I saw it the other day, it was one of the sixty second comercial that don't tell much about the product. You don't have to use batteries, just shake the light and presto.

The coil is inside the flashlight tube, wound the lenght of the tube. Their's a little ball magnet inside. So when you shake it, the magnet moves up and down. Producing electricity.

It has not have a battery on it some place that gets charged.

Thought it was a neet idea if anyone cared.

:lol: Why didn't I think of that! :cry:

Regards

D.J.

 

williB

New Member

• Jun 12, 2005

• #2

https://www.electro-tech-online.com/threads/stuck.15905/
:wink:
i dont think it is a ball magnet that wouldnt work..
their flashlight uses only one cylindrical magnet ( mine used seven )..

 

D.J.

New Member

• Jun 12, 2005

• #3

Hi williB

Sorry my mistake, they were using a cylinder magnet.

You guys go on forever in that discussion. I am trying to get through it all

So if that thing worked out ok, are you going to sell it?

Very cool idea 8)

Regards,

D.J.

 

williB

New Member

• Jun 12, 2005

• #4

naaa i've got something better in mind..

 

D.J.

New Member

• Jun 12, 2005

• #5

What could be better than making a ton of money off something you made.

If it works well, it would be very handy.

My Mom does the paper route and is always having trouble keeping her battery charged, and or, buying new ones. So's my Dad who also works night shifts.

Hopefully it's something I could build so they both have a good light.

Regards

D.J.

 

williB

New Member

• Jun 12, 2005

• #6

as good and cool and powerfull as the shaker is , it is inherently flawed.
i dont know why i didnt see it earlier on , but this is the way to go,
**broken link removed**
strangely enough i have a larger version, of this allready made..

 

williB

New Member

• Jun 12, 2005

• #7

although i see an application for the shaker, for somone that lives near water it could generate a bit of power from wave action..

 

J

Jay.slovak

Active Member

• Jun 13, 2005

• #8

Those "Flash lights" sounded good to me some time ago, but I heard their light is so weak, and they are so expensive, that you can buy tons of standart bateries, and it will still be cheaper than this "Magical Flash Light".

 

D.J.

New Member

• Jun 13, 2005

• #9

On the commercial the flashlight was suposed to stay lit for a while with only a little shaking. :roll:

They even had a police officer on there supporting the light.

Trying to make it look better than it really is! :twisted:

But something like that should work if you used the right size of coil and a strong neodenom( rare earth magnet ) magnet.

D.J.

 

plot

New Member

• Jun 13, 2005

• #10

There was another thread on this subject a loooong time ago:
https://www.electro-tech-online.com/threads/formula-for-firing-angle-of-scr.5998/

that one got a little in depth, and someone with one of the flashlights was able to take some good pictures of us and tell us what components it used.

i was gonna sum up what that thread said here, but you might as well just read the entire thing. 8)

 

Last edited by a moderator: Dec 26, 2013

D.J.

New Member

• Jun 13, 2005

• #11

Hey thanks,

That discussion seems interesting too.

 

theinfamousbob

Member

• Jun 14, 2005

• #12

Saw a "shaker flashlight" at the Sharper Image store once...4 super bright white LEDs...shake for about a minute and you could shine in for a few minutes across the store and see the spot clearly on the other side in full daylight.

 

S

stevene

New Member

• Jun 19, 2005

• #13

uhm.. i am electronics newbie and all, but couldnt u do something along the lines of the circuit posted below, it probably is totally incorrect, bu as a bored, drunk, newbie i thought i'd give it a try
Sorry about the wordpad .doc extension, wouldn't let me post a bitmap (got no conversion software). Sorry in advance about how wrong it is.

 

Attachments

• circuit_980.doc

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Roboticinfo

New Member

• Jun 19, 2005

• #14

reply

My sister has one of those flash lights
it's pretty cool.