Eternal flashlight or Faraday's flashlight this is the name of a flashlight with an alternative power source. That is, this flashlight does not require batteries or battery charging. To "light" it, you need to shake it. The flashlight itself contains a generator and a rechargeable battery.
Let's get to know the factory flashlight first:
I tried to paint the structure as much as possible. The bottom line is that the cylindrical constant magnet dangles freely in the tube - the body between rubber stops or springs (where as). And a coil is wound in the center of the tube. When shaken, the magnet runs up and down inside the coil, creating alternating electricity in it.
Let's see without a case.
We see a solenoid, a cylindrical magnet, limiters, a small board with diodes, a switch, and batteries. Oh, and the LED on the board.
Shake the flashlight and turn it on. Working!
And here is our prototype:
Tick-tock box. The tube on which the coil is wound is a body from a ballpoint pen. A couple of magnets from hard disk, there are such. Yes, capacitors are used instead of batteries. White LED. a pair of diodes.
There is a feature of coil winding. As you probably noticed from the diagram, the coil consists of two windings, the total length of the coil is 40 mm. Divide mentally hit. In the first half, we wind 600 turns of the thinnest wire with a diameter of about 0.08 mm. And in the second half there are 600 turns. That's it - the two-section coil is ready. Further according to the scheme.
People who studied in the Soviet school can recall physics lessons, when, according to the training program, children were shown a magnet that was inserted into a wire coil, and the device on the table showed the presence electric current... Thanks to the scientific discovery of Faraday, the whole world uses electric motors, generators, headphones and other electromagnetic equipment.
In one of the simplest and at the same time witty in their design, which are called eternal, his idea is embodied, which almost one to one repeats the experiment in physics described above. Next, let's look at how to make a Faraday flashlight yourself and without unnecessary hassle.
The photo shows the appearance of a Faraday flashlight. And in the photo below is its diagram. As you can see, the device consists of a magnetic core, an induction coil, printed circuit board charger for battery, rubber stoppers, bulb with lens and switch. You can buy neodymium magnets from a Chinese online store.
What is the principle of the eternal flashlight? The fact is that the design of the device is made so that a cylindrical magnet can easily dangle in the tube, passing back and forth inside the coil, which is wound in the central part of the tube. On the sides of the tube there is a rubber stopper, which is needed to stop the magnet with each movement and push it in the opposite direction. When the magnet moves, a current is generated in the coil, which charges small battery... If you do not include the battery in the circuit, you will have to shake the flashlight constantly so that the lamp does not go out. But you can replace it with a capacitor. In the photo below, the lantern is disassembled. 
The author of this device especially notes that there are two windings in the coil, which together have a length of 40 mm. In the first half, you need to wind 600 turns of 0.08 mm wire. The second section repeats the first exactly. Below electrical circuit Faraday lantern.
psm 23-01-2007 16:37
Nonsense? Are there any built on this principle working models of lanterns?
The secret of the Original Gift The Eternal Faraday Flashlight "Universal" is in a capacitor of large electrical capacity, which is charged when the case is shaken. And also - in a bright LED, complemented by a powerful lens. The design of the flashlight is very simple and very reliable, which adds convenience for long-term and constant use of the flashlight in the most extreme situations.
Andrew Nik 23-01-2007 18:20
The situations are the most extreme, and the design is very reliable ...
What do you think yourself?
psm 23-01-2007 18:36
The LED is bright and the lens is powerful.
The situations are the most extreme, and the design is very reliable ...What do you think yourself?
Are there working models of lanterns built on this principle?
In the sense of reliable, albeit weak (shine under your feet).
Interested in an alternative to the soviet bat (expander-hummer) made at the proper technical level? That is, a flashlight that can lie for years without use and works without batteries due to muscular strength (twisting-spinning or shaking).
I would buy such a heap!
baraka 23-01-2007 18:38
I on NG gave two such small flashlights to 3 and 4-year-old cubs. They were absolutely delighted. But the eldest arranged a complete kirdyk for his one evening. The younger one is more careful, with her he survived the first evening. The further fate of these high-tech devices is unknown to me, but I think they have already ended their existence in the trash can.
A bug-flashlight, which must be squeezed like an expander, is much more reliable.
psm 23-01-2007 18:47
The question is not about the quality of this instance.
And about the availability of a quality alternative.
Question:
Is there a noteworthy mass-produced model of a lantern (foreign car) that works without batteries by converting the user's muscular strength (twisting, twisting, shaking)?
Glal 23-01-2007 18:51
It's hard to say ... In principle, there are still models (even here someone showed and told) with a handle like a dynamo http: //www.adrenalin.ru/index.php? GID \u003d 1521 ... It seems to me that that most of the "exotic" "eternal" lanterns are pure Chinese (with all the ensuing consequences) ...
asi 23-01-2007 18:53
can try chemical light sources. they seem to be able to lie for a long time and then once and shine a little
psm 23-01-2007 19:07
quote: Originally posted by asi:
can try chemical light sources. they seem to be able to lie for a long time and then once and shine a little
I don't want a bit :-)))
Andrew Nik 23-01-2007 19:10
That is, a flashlight that can lie for years without use
Buy any decent flashlight on 123 lithium cells, put it where you need it and forget it.
The shelf life of such batteries is 10 years, which means that after 10 years the capacity will drop to no more than 70% of the original. Temperature regime practically on a drum.
The reliability of such a solution (provided that the lantern is well sealed) is incomparably higher than that of a Chinese craft with a dynamo.
asi 23-01-2007 19:17
quote: Originally posted by psm:I don't want a bit :-)))
And the buzzbox helped me out several times!
When at the right moment it turns out that the batteries are dead in the super-cool-cool flashlight, there are no spare batteries and you are standing 200 km from Moscow on a dirt road and you need to shine a light under the hood.
well - a bit it's up to 8 hours.
igora 23-01-2007 19:20
quote: Originally posted by Andrew Nik:
Buy any decent flashlight with 123 lithium cells
there are also lithium AAs, only they are harder to find 123x here, but you can always stick ordinary ones
You carry an AA flashlight and a pair of lithium batteries in a sealed package in your car
Andrew Nik 23-01-2007 19:38
In principle, the most reliable version of an NC flashlight is this: a dual-mode LED, a decent manufacturer (Inova and higher), AA batteries, you put a standard lithium Energizer there, for example. And if the main lamp dies on the highway 1000 km from the dwelling, then this will be enough for several hours (in a weak mode), and a strong one can beacon, etc. And then you buy additional AA in the nearest settlement.
As a typical contender: Fenix \u200b\u200bL2T.
As an option, more suitable for work under the hood, is the Tikka XP headlamp Pezl.
P.S. Important note: you need to be sure that specific model The flashlight is compatible with AA lithium. There have been reports on CPF that lithium cells "kill" some models of flashlights. In this sense, a flashlight with 123 elements is more reliable - it was originally developed for lithium
igora 23-01-2007 19:51
quote: Originally posted by Andrew Nik:
For complete reliability, the principle is this: you need two independent lights.
liked the wording of one person at CPF
Two is one, one is none
What is loosely translated: "Two is one, one is counting none"
And the forehead drives, especially in the car
ober 23-01-2007 23:14
There is such a miracle - a flashlight with a built-in "dynamo". This is a more "advanced" modification of the "bug". It looks like ... a flat flashlight with a retractable handle on the side. That is, the handle folds and does not protrude from the body. You twist the knob for two minutes and you get a modest (but free) light for 15-20 minutes (even after 20 minutes it was still on for me - turned it off, it was time to go home). The number of LEDs is 5. You can turn them on according to the scheme: 1, 3.5 (like this). The flashlight is made by the firm FIT (which produces the tool). The flashlight has an OUTPUT for charging the mobile. The mobile did not charge, so do not try what and how. The cost of this miracle of Chinese industry is 400 rubles. Resource - and hell knows, this resource. The build quality is quite satisfactory (better than Chinese bugs with half-dead kinematics). For EMERGENCY backlight will go.
TheHemul 24-01-2007 23:56
quote: Originally posted by igora:there are also lithium AAs, only they are harder to find 123x here, but
"We have" where is it?
In Moscow, the markets are easy to find.
redrum 25-01-2007 12:37
Yesterday an old woman came up to me and offered to buy an eternal primus needle. but I did not buy. I don't need an eternal needle. I don't want to live forever ... (c)
but seriously, the theme of the "eternal" flashlight is interesting. I just wanted to buy the other day with charging from solar battery... flat case with battery on one side. write that day in the light \u003d night to burn. what will be my feelings about this? I dreamed like this: if the battery on the flashlight opened with a book, turning into a more serious device for charging, say, one or two AAs or a walkie-talkie ... I would take it without hesitation. I wonder if there are such? I wrote and thought that everything could be beaten more easily - buy a solar solution for aa. but with a flashlight in one bottle is clearly more fun.
i carry spare batteries myself and does not throw me far from civilization. but the presence of a flashlight for the most extreme case somehow warms the soul.
Glal 25-01-2007 02:00
Well, there ... In the report about the first flashlight ... Oleg-Term brought a joke for the sake of a Chinese "bug". He has been with him for a long time. Works for himself ... Smokes little by little ... And very compact ... There was a photo ...
redrum 25-01-2007 02:35
modern bugs are flimsy. plastic gears. I had (yes swam) antediluvian Soviet bug. body made of gray dense plastic. metal rocking teeth. beast machine. he would now be hooked on the diode ...
Glal 25-01-2007 02:41
I remember this. Only all metal. I was at my father's ... Heavy ... Buzzed with gusto ... I "grabbed" my fingers a couple of times ... A flashlight "monolithic" in feeling ...
redrum 25-01-2007 02:54
maybe entirely metal. I remember that it was very heavy. streamlined body color of galvanized sheet (or just shabby). oh, it was long ago. Probably not to find him now. the only negative is that you cannot pump it in advance so that you can shine calmly.
Pati 25-01-2007 12:26
Oh, I just brought such a Faraday flashlight from China yesterday. If anyone is interested, I can make a reviewer by evening.
Nervous 26-01-2007 01:32
There is a similar lamp (translucent), and somehow it shines very weakly.
Pati 26-01-2007 03:03
So a small review / test of my "eternal" flashlight. Photo first appearance and size comparison with U2:
The flashlight is 19.5 cm long. The body is made of plastic and is quite pleasant to the touch. In terms of its properties, the plastic is close to that on the Shurov battery boxes. In front there is a lens that focuses the light from a simple diode into a circle with uneven brightness (seen in the beam shots):
There is a rubber seal between the lens and the body. In principle, water resistance is declared, but looking at the feeble slider of the switch, I suspect that the flashlight will not survive submersion in water.
Now beamshots. Left SureFire U2 at minimum brightness, right Faraday lamp after 25 seconds of intense shaking. Beamshots show the time in the "minutes: seconds" format:
As you can see, the usability of the light remains for about a minute, after 2 minutes the spot is almost invisible and practically nothing can be disassembled in the dark. Total:
Pros:
- no need to think about batteries.
Minuses:
- a short time work from one "charge".
- a strong magnetic field around the flashlight, which attracts metal objects.
Andrew Nik 26-01-2007 10:28
Well, if you consider that the minimum level of Ultra is the unfortunate 2 lumens, as well as the dimensions of the lantern, then such beamshots are not impressive ...
In any case, as a "spare light in the car" is absolutely useless.
And 26-01-2007 10:54
Hmm, brightness is not impressive
Pati 26-01-2007 12:06
Andrew Nik, And
I agree, there is little sense from the flashlight. Especially with one minute of work. I basically bought it just for fun
federal 05-02-2007 23:11
There was a bug, but not Soviet, but rather perestroika. Black plastic, metal lever, with plastic teeth. I rarely used it, but somehow I had to shine for a long time. He died after half an hour of intensive work. An autopsy revealed one of the gears had collapsed.
Today I saw a bug in auto parts. 2 large LEDs, vertically located, country of origin is not known, body, blue, price 110 rubles.
slav_2000 05-02-2007 23:49
I ordered this on DealExtreme:
http://www.dealextreme.com/details.dx/sku.22
Already brought from them for the test a laser pointer for $ 2. Delivery is like clockwork - in 2 weeks exactly.
Here is the "eternal" lantern with delivery - approx. 5 dollars. It's not a pity - there will be an experiment.
P.S. / off: there they also have 3.0 Volts akki and charging to them. I don't even know - try it?
psq987 05-02-2007 23:58
It is easy to guess the country of origin.The price range for them is large - I saw from 50 rubles.
I have one, I did not perform an autopsy for the electronic part; it shines so far from the initial charging of the batteries (though I didn't really use it). Let it lie, it may come in handy when ...
balash33 06-02-2007 12:11
Not so long ago I bought this "eternal" lantern. Well, it shines. Well, some stump is shaking there. I opened it, of course, and saw just a charm - a coil, the ends of which are in the air. The board is printed, on which there is not a single part (there should only be four diodes), no batteries, but there are two disk batteries, type RC3032, it seems. And instead of a magnet, a piece of solder ten millimeters thick. I was so delighted that I didn't even go to the store to take this miracle :-)
psq987 06-02-2007 14:08
There are some. Chinese harness
Tojvo Glumov 06-02-2007 15:15
Several years ago I saw a flashlight in the "Technics of Youth" magazine, which, it seems, had a double power supply, could work from a handle 15 centimeters long, which had to be rotated. On a vskidku height 20 cm, length 25, width 15, the exit hole 10 centimeters. Also something like: twist a minute or two - 20 shines. On an ordinary light bulb.
(All sizes with a spread of one and a half to two times :-) The magazine did not find it.)
I read somewhere that a person inserted an "ovsky LED" into a Soviet like Luxeon expander, was pleased. By the way, that very capacious capacitor in this Faraday unit is called an ionistor, I think if you make a stabilization circuit for an LED using it and insert it into a Soviet - will be much more effective.
And I once saw such a "Faraday" one, quite neatly assembled, and, moreover, reaching the edge, it also kicked off with a kind of rubber band. Have worked. Weak. In fact, it is nothing more than a toy, it does not matter if the child is 5 or 50 years old. :-)
Tojvo Glumov 08-02-2007 23:02
Solar cells are already being sold. And of the finished products of this type, the Soviet engineering calculator amuses me most of all. Soon it will be possible to power the PDA from such a solar battery.
NLPepper 09-02-2007 12:01
Now, yes, they do. And 20 years ago it was a rarity. And heavy, contagion - the elements are covered with thick glass (almost window)
Udavilov 11-03-2007 20:56
used this. thing is extremely useless. it needs to be shaken constantly, and quite intensely. you shake for a minute, three shines, and 40 seconds are bright, the rest are barely visible. there is no sense.
Hello to all readers and admirers of the Radiocircuit website! Today I want to talk about the creation of an "eternal" lantern. For a long time there was an idea to assemble a flashlight that works due to muscular strength, converting mechanical energy of rotation into light. Such a flashlight has a very big advantage over others - its battery cannot "run out". But, of course, it is not without a drawback - in order for them to shine, they will have to work. Therefore, its first purpose is to work in emergency mode (if the batteries turned out to be dead), when you urgently need to shine somewhere, for example, to screw plugs in the electrical panel. Since with long-term work, a person will simply get tired of turning the handle of the flashlight.
Dynamo flashlight circuit
Listing of the case on a 3D printer
So, there was a thought, but it was difficult for her to materialize, since it was necessary to assemble a gearbox with an electric motor and stuff it into some kind of case, and for most radio amateurs, the case is a "stumbling block". But this task has been radically simplified with the purchase of an inexpensive 3D printer. Now the construction of any housing for an electronic device is limited only by the author's imagination.
The first pancake, as usual, was lumpy: I printed out the case, not yet knowing what the finished device would look like, taking the first engine that came across as a generator. It turned out that even with a very fast rotation of the handle, there was not enough tension for stable work lantern. Then, taught by bitter experience, he approached the question more meaningfully. I took a bunch of existing engines and tested them for suitability for this project.
We do this: we clamp the motor shaft into a screwdriver, give the maximum speed and measure the voltage and short-circuit current of the motor. We select the best specimen accordingly. According to my observations, it is best to take a high-voltage (12 -24 volt) and low-revving motor.
Further on the gearbox: I used the factory gears, since my 3D modeling program does not have a library for building the latter and I am printing so far from PLA plastic, but it does not differ in wear resistance. I used the drive gear and the motor from some kind of electric corrector of car headlights, intermediate (large) from the drive of the discs of the AIWA music center, the last (on the motor) from a children's car. The lens used from a non-working Chinese headlamp... From the pros: a lens is installed in it and it is possible to change the focal length. The light source is a three-watt LED, which, of course, is not used "at full strength", but it has no equal in reliability (with such a low load).
As you know, such lamps have one more drawback - they shine while you turn the handle. To at least to some extent smooth out this drawback, I installed supercapacitors in the case with a total capacity of two farads. And in parallel with the latter, a five-volt zener diode, since the maximum voltage of these supercapacitors is 5.5 volts, and the generator is capable of delivering up to 12 volts without load. A switch is installed in the side wall of the device, which disconnects the LED from the supercapacitors; if unnecessary, you can turn it off and the supercapacitor will retain a charge for subsequent use. In the off position, when the handle is turned, the process of charging the supercapacitors occurs.
Photo of the manufacturing process
A group of enthusiastic engineers have created a unique flashlight that can be charged from the human body. This makes it a virtually endless light source, small but sometimes very necessary. A flashlight is one thing that rightfully belongs to the "Must-Have" category.
Everyone should always have a pocket flashlight - you never know when it will come in handy. You need to have it at home in case of a blackout, in the car, on a country trip. However, everyone who at least once in their life had a personal flashlight, large or small, powerful or not very much faced with such a problem as dead batteries. It is very unpleasant, especially at a crucial moment to find out that the flashlight does not shine or shines in such a way that, at best, you can highlight its location in a dark space.
A group of enthusiastic inventors managed to solve this problem. Why use batteries when you can use a thermoelectric generator in flashlights? Of course, this technology is not applicable for a powerful "searchlight", but it is just perfect for small pocket flashlights. It was on the basis of TEG that flashlight Lumen.
The principle of the Lumen, as well as its design, is incredibly simple. The idea is based on the already mentioned thermoelectric generator. The flashlight uses multiple LEDs to project light. The power of the glow is enough to read a book in pitch darkness! The flashlight itself is incredibly small, literally finger-like.
The body of the device is made of aluminum. The device weighs only 45 grams. The TEG of the flashlight is started, provided that there is a source of thermal energy (heat) from 28 degrees Celsius. The ideal option in this case is the human body. On the body of the flashlight there is a special groove for a finger, pressing on which Lumen turns on and starts working. The flashlight can work almost without interruption. It also has a built-in small battery and capacitor.
In the warm season, the flashlight is slightly charged even from the air around it, provided that its temperature is not lower set bar... Now the device is in the stage of a crowdfunding campaign. To implement the project, the creators needed only 5 thousand dollars. For 2 days of collection, the company beat off the established limit by 328%! Will enter the Lumen market in the first half of 2016. The cost of the device will be $ 15.
Will appeal to lovers of gadgets and - an irreplaceable travel companion.
