MIT Physics Demo -- Inductor Radio

[timothy22597]

Would it make noise if it was facing 180° to the original direction? If so, what?

[TheRumpletiltskin]

isn't that the way the volume knob works on a radio anyway?

[theschoolofchuck]

It's an isolation transformer. A party trick.

[zimmerking2]

Unlike that `other useless school right down the street from y'all, a helluva lot of good stuff comes out of MIT, ;o) Thanks!

[mattmc318]

MONEY!

[justanonymous0]

I guess this occurs by constructive interference :D

[welldonespiderfish]

great fun...i made this and it works...brilliant

[sydfloydpink]

JUST LIKE THE PICKUPS ON MY STRATOCASTER

[MegaHollywood66]

P.s.... It's like the 2 coils are mini electro magnets producing a magnetic field from within the core and when pulled further away, .weakens the field ....to my knowledge, a magnetic field has 2 currents ...with a south end as well as a north end( - and +), running spiral in opposing directions(like 2 springs spiraling towards, then through each other, then out each end of the field)..

again...I could be wrong....any input on this???

.

[MegaHollywood66]

I wonder if the transference of radio waves from 1 coil to another due to the polarity of the magnetic fields in oposition of each other??

As notice when he was turning one of the coils it appeared as though he was demonstrating the response of disturbing the magnetic field between the two coils.

I could be wrong...

Any ideas?

[DracoEdmar]

@MegaHollywood66 actually at the begining there´s jus one magnetic field, the one caused by electrical flow of the radio (due to the Biot Savart Law), the second wire (the one with the speaker connected is inactive (it is just a closed circuit). when u get the first wire coil closer to the second one, because of the Faraday´s induction, the magnetic field of the first wirecoil, produces an electrical force wich is equal to the negative of the derivative of the magnetic flow respect to the time

[MegaHollywood66]

@DracoEdmar Thank you!



[HoneycombAgent]

Don't put it too close-- *GZZZT!*

[smilinrk2003]

Your explanation is confusing if not wrong. The speaker responds only to audio frequencies (10Hz to 15KHz). The radio does not intentionally radiate RF (generally defined as above 100KHz). The powered coil looks to be driven by the audio output of the radio. That is certainly not RF and certainly is <15KHz. What you are demonstrating is simple induction which is not the same as actual EM wave emission.

What you are demonstrating is more like what happens in a transformer. An audio transformer.

[nikhilsamy]

@smilinrk2003 right man

[alecaccia]

@smilinrk2003 You are right. In fact if they were antennas, instead of transformer coils, they would be pretty big at 15kHz... :)

[mindsoulbody]

Manual volume control, literally. :D

[Dogslax3333]

gotta love tesla...

[0903390901]

COOL TecH :D

[maor1993]

Vote up if you liked this video only because of Pink Floyd

[537CH]

cool!

[VijenSew]

Wireless comms- whats new. Bluetooth, WiFi, GSM, ZigBee....... induction usinggiant coils? hahaha :)

[gumby1008]

@henrykay01 yeah sure ill just hand over $6m based on a short comment on youtube

[Gello81]

STOP... TEASING! CRANK THAT SHIT UP!

[mackenzie235]

it,s transformer coupling. was used for impedance matching.

[peskystudent]

Thank you for "replicating" one of the many experiments of Nikola Tesla, done over 100 years ago! Now please give credit were credit is do.

[IIIDarkWorlDIII]

lmao they are not saying that they inveneted it. its just an experiment where they show the practical appliance of those formulas that tesla, fartaday, maxwell and others had invented

[tannersword1]

haha oh yeah... m1ndcontroller (it was SUPER clever to replace the i with a 1 btw), uhmmm shut it.

It's good to see you're thinking though

[tannersword1]

yea pink floyd and induction woot woot!

[m1ndcontroller]

This is NOT transmition of Radio Frequency Energy!!!! This is AC Inductive Coupling of an AUDIO SIGNAL!!!!!

Lies I Tell You!!!! LIES!!!!!!!!!

MIT spreading Misinformation again!!!!

An audio frequency EM wave has a wavelength of HUNDREDS OF MILES!!!! Not to mention that the speaker doesn't even have a radio frequency receiver!!!!

[drewschkelton]

shut up.

[daenumen]

@drewschkelton lmao

[shriramvenu]

its the same damn thing - BASEBAND transmission

[yarahahrwe]

pink floyd owns

[twycross3]

Loved your video cause it gave an idea of distance of coils and the effect

[k9kmc]

Need a lot of watts to work DX !

[gaussman08]

not really D: you can do connecting 1 coil to ur mp3 and the other 1 to ur hearphones and it will sound :B

[lapulga5]

yo no dije que no funcionara. Tal vez mi comentario fue malinterpetado, tienen razón en que no se entiende mucho. Pero yo dije: Si es falso(como condicional), o sea, si acaso fuera falso, Y los demás fueron interrogaciones ¿Cómo es que no funciona a 90º? ¿Y por qué decrese la potencia al aumentar la distancia? Dije que los fenómenos que lo rigen ya se estudiandesde hace tiempo: La inducción electromagnética de michael faraday. Perdón por el malentendido

[QuarkToo]

The inductive capacitance of a coil eliminates the need for two wires to each coil since the coils self induct.

Between the coils and both the radio and speaker, you should find an AV plug (two diodes in parallel in opposite directions).

This is single wire power transmission discovered by gypsy whores in the late 10th century to avoid being flogged by the kings angry drunken dwarfs.

Is that the best MIT can do? What a bunch of bitches.

[QuarkToo]

Wait a minute, I read that that wrong - there are TWO wires going to each coil. Holy shit, MIT is worse off than I thought.

Dude, stop wasting all that extra wire since you only needed one wire going to each coil and an AV plug.

We need that wire to make things that are actually useful and innovative.

[lapulga5]

you don't know what you're saying, this is just a demonstration. It is used to make us know the principles of induction and RF. The MIT is the best university in the world and have a lot of intelligent people. I think you'rejelous becuase you're not one of them. This is not a great experiment, but it is awesonme. I made that in my home and it worked. MIT guys knows what they do.

[mumish13]

ur radio AF output is connected to the coil?

[gurlyfe]

Amazing!

[PhysicalGravity]

MONEY by Pink Floyd is the song.

[personalfunfest]

thanks, overall the video is fake though. No way this is possible without wires

[Fattythe2nd]

That shows how much YOU know! jk

The coil connected to the radio had a varying current which comes from the radio and the magnetic field around the coil is switching back and forth many times a second. The second coil senses the magnetic fields switching and alternating currents are produced. (Not AC) The current goes through to the speaker which projects the audio. This is real mind you.

[personalfunfest]

Not really - the video is fake. It is made with special video editing software called I-film.  Theres no way this is possible without wires. It has to be a direct transmission.

Good trick though. Almost had me fooled at first. You should study Newton more to understand the laws of thermodynamics - they definitely apply here - and this type of 'wireless' transmission is just not possible without actual wires (perhaps the real wires were hidden from camera view in this instance) anyway good luck

[panama13]

Thermodynamics are the principles regarding energy and its transport, not electronics. They do apply to electronics, but this demonstration doesn't break those rules.

Study inductance, and you will see that this is possible. At long enough distances, this kind of transmission would not be practical, but it is possible.

[guitarraenllamas]

Hahah men!! it's the magnetic field varying with the time!! .. xD ..

[tomasiop]

stupid i make it and works

o mi fucking god REALLY STUPID

[BlackCow99]

"Good trick though. Almost had me fooled at first. You should study Newton more to understand the laws of thermodynamics" Perhaps you should study Faraday more to understand the law of induction! Idiot.

[lapulga5]

y aparte newton no hizo las leyes de termodinámica, solo las de movimiento, gravedad, optica y mas, lo qeu no es poco pero no hizo las de termodinamica

[lapulga5]

nada que ver, no tenés la más puta idea de esto. Te haces el más y sos un choto, despreciando el trabajo de estos tipos. SI es falso, porque la corriente aumenta al acercarse y decrese al alejarse. Y po que en 90º no funciona. Eso es totalmente posible y las leyes que rigen dicho fenomeno están estudiadas desde hace tiempo. Vos no sabes ni que es una radioy no sabes contar. nena

[gaussman08]

puta eso muestra lo increiblemente weon que eres INTENTALO AWEONAO Y QUEDESE CALLADITO

[lapulga5]

para que sepas ya lo hice y funciona tonto

[gaussman08]

entonces a qien le reclamas D:

[mumish13]

lapulga te apoyo

[mumish13]

pero dices q te funca y q no funca.... xDDDD

yo hice el experimento usando 60 vueltas de alambre de cobre alrededor de un frasco de tempera FUNCIONA DE MARAVILLA WN!!!!!!!!! CON AUDIFONO CONECTADO A OTRA BOVINA DE 60 VUELTAS!

[personalfunfest]

what song was that???

[ashz8080]

Due to faraday's law changing magnetic field in one coil produce emf in other coil

[izzatsandhu]

What are the materials used in this demonstration, procedure and observation!

[youngnewtonian]

Nothing special... It is just plain copper wire wound around the circle. Then both of the terminals of the wire are connected to both terminals of speaker. Same goes for the radio. I don't exactly know how many times you have to wind it, but I think the number should be same for both coils.

[woo216]

wow thats some s3xy physics right there

[castingcastaneda]

So you have turned the radia into a transmitter?

[arande3]

Money...it's a hit..

[reebanoomba]

wtf

[blower05]

Since these kind of stuff usually work at rsonance, is it a must the two coils are the same? Different coils size and turns will also work?

[hecksign]

could you please send me the circuit schematic to me?

[nastavliech69]

All right, so what, an air-core transformer. Again, I am a little disappointed at the lack of...complication in this MIT physics demo.

[bccritters]

K.eep  I.t S.imple S.tupid

[F00dTube]

keep is short and simple ^_^

[rivetgeek]

Call me when you get accepted to the physics program at MIT.

[icecreamdaddy]

first comment!!