Wireless Electricity: a Simple Experiment

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With only 4 components you can experiment with wireless transmission of electric energy. This system exploits the resonant inductive coupling between two coils to transmit energy between them.
Slider 2732 (you should check his channel, he has great experiments on wireless systems and other subjects / slider2732 ) makes the following suggestions:
Any NPN or PNP small signal transistor can be used. For PNP, simply swap the battery connections over. Best to try, include 2N2222A, S9014, C1815, C1213, MPSA06. For PNP, 2SA733 and upward.
For overheating troubles, make sure to have 12+ turns and/or add 100ohm resistor in series to a power wire input, or a similar resistor to the Base.
Adding a 1N4148 diode on the other power input will also drastically reduce heat and current.
To run at higher voltages than 1.5V, add a 5K variable resistor to the Base.
Use 12 turns and above for reliable operation, around 26AWG wire works best.
Small ceramic capacitors can be added to receiving coils for improved efficiency. 0.001 range ('102' as written on popular types). Receiving coils can be various and need not match the transmitting coil...such as a ferrite round choke with LED on top, 1/2 diameter coil or pancake coil.

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8 сен 2024

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Комментарии : 847

@byzanttine Год назад

If only this channel existed when i was studying engineering, i wouldn't have had to sit in boring classroom lectures with absolutely zero practical application examples. Thank You for making these videos.

@jimh7933 8 лет назад

I tried this experiment at least 10 X before final success. drove me crazy... but now once it works, I can't stop making these things and they all work. Here are my tips... make sure you have a low voltage LED, not an infrared LED. the LED's I'm using are 2.5V or less. Make sure you use the proper transistor. make sure you remove the enamal from the magwire at the connection points. I also bought a battery holder box with leads coming out of it so i was sure the connections were being made. I also soldered my connections to the transistor. not twist tied, but soldered. IT WORKS!!! I've tried different quantity of winds and it works at different windings. Good Luck... and Thanks, Ludic Science...

@ludicscience 8 лет назад

+Jim H Glad you made it work! Happy 2016

@Bradman175 8 лет назад

+Ludic Science Ludic UR circuit is a bit trippy. You need a stabilising resistor and capacitor so that it will always work. Look at this www.seekic.com/circuit_diagram/Signal_Processing/Oscillator_Circuit/CENTER_TAPPED_TRANSFORMER_AUDIO_OSCILLATOR.html (The transformer is replaced with the coils and the speaker is replaced with the Led, unless you want sound)

@dalmatiko 7 лет назад

can i use transistor MPS2222A

@laurafischer3028 7 лет назад

t'ai un génie ludic science

@stopmotiongags5800 7 лет назад

Do you use insulated wire?

@thanasis125 8 лет назад

Hello from Greece. I made it successfully with a "tip 9014c" transistor. Thank you for the demonstration!!!

@ludicscience 8 лет назад

thanks for the input

@BushCampingTools 8 лет назад

Great educational videos. Keep them coming!

@naranbhaipatel3617 7 лет назад

Bush Camping Tools ssss

@emf4kv 9 лет назад

This is a good video on transformer principles. The transistor oscillator is a good addition with a good explanation. It is good how at 3:14 you explain generator principles. Near the end, you say that the turns have to be the same. They don't necessarily have to be the same. Googling "turns ratio" will get you all the info on how to vary turns ratio. It might have been good to insert a piece of iron like a nail or something to show the effect of a core on this circuit.

@ludicscience 9 лет назад

emf4kv Thanks for your input

@iremyucel1075 8 лет назад

I have used this video of yours for a science project in my university. It made a very useful central source. Thank you!!! Please keep your videos as such coming!!'

@ludicscience 8 лет назад

thanks

@shvideo1 3 года назад

A great, fun and very creative video. I don’t at all understand the thumb downs! Great job. Keep creating!

@sodabutnofizz1294 2 года назад

will using less coils in the second loop affect the conclusions?

@purge_thehumanrace 4 года назад

Ive watched this video 15 times at least. Im finally gonna make one but i love the way this guy explains what hes doing. He sounds like pedro from Napoleon dynamite if anyone know that movie lol

@------country-boy------- 4 года назад

VOTE FOR LUDIC !!!

@Jutte777 8 лет назад

Hi Ludic, Make the transmiter coil as a joule thief - LED goes to transistor emiter- it will light up if you touch coil centre tap - or if you touch collector or touch transistor base with the other leg of the LED. Lots of fun...LOL !

@ludicscience 8 лет назад

Great!

@kevinpizzolato86 2 года назад

I am a Science and Math teacher and use your videos very often. Best we've seen!

@ngokul3099 9 лет назад

Thanks Ludic science.I did this for science exhibition and got first.

@Bradman175 8 лет назад

Lol

@THarshavardhanReddy 8 лет назад

+Bradman175 lol at your lol!

@shivanshaggarwal6096 6 лет назад

N Gokul is it working on mutual induction ? Plz help

@jeffiscool1805 6 лет назад

FYI for anybody that has had trouble making this work. I have found the 2N2222 pinout is NOT standardized. It varies between manufacturers, case styles, and part numbers.

@igrewold 6 лет назад

Get an M-Tester = Transistor Tester = LCR-T4 is cool, cheap and useful. It shows you the pins duckduckgo.com/?q=LCR-T4+&iar=images&iax=images&ia=images ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-7Br3L1B80ow.html

@ajbufort 7 лет назад

Thank you for an extremely clear, well-explained presentation!

@Slider2732 9 лет назад

This is identical to SWES 2 - which I created and showed on my channel, July 1st of last year. The original SWES dates from 2012, same but using a pancake coil. So, a bit of help for people asking questions on this video: Any NPN or PNP small signal transistor can be used. For PNP, simply swap the battery connections over. Best to try, include 2N2222A, S9014, C1815, C1213, MPSA06. For PNP, 2SA733 and upward. For overheating troubles, make sure to have 12+ turns and/or add 100ohm resistor in series to a power wire input, or a similar resistor to the Base. Adding a 1N4148 diode on the other power input will also drastically reduce heat and current. To run at higher voltages than 1.5V, add a 5K variable resistor to the Base. Use 12 turns and above for reliable operation, around 26AWG wire works best. Small ceramic capacitors can be added to receiving coils for improved efficiency. 0.001 range ('102' as written on popular types). Receiving coils can be various and need not match the transmitting coil...such as a ferrite round choke with LED on top, 1/2 diameter coil or pancake coil. The system is the simplest, not the best. The bare bones was my intention, for easy replication.

@ludicscience 9 лет назад

slider2732 May i quote your recommendations on the vid description?

@Slider2732 9 лет назад

Ludic Science Hi there...yes certainly, glad to help :)

@GuyDascalu 9 лет назад

I just made this, worked surprisingly well! Thanks for the clear instructions :D

@pauls0416 8 лет назад

WOW!!! I thought I knew a lot about electricity and electronics. This was very helpful for me and easy to understand. Thank you! :)

@abhisheknath3419 7 лет назад

Great project. What is the use of the transitor in the coil? is it used as an amplifier,a switch or a medium for AC? Please help me with it . A detailed explaination please. Thank you

@samueljaikumar2602 7 лет назад

thanks a lottt "ludic science"!! helped me in my project very well

@shaileshpatel6442 6 лет назад

Wireless electricity transfer . A simple video is very nice video.

@vivekgangwar9730 5 лет назад

You didn't explain how exactly is the transistor making the magnetic field oscillate!

@integrationofmanandmachine4714 4 года назад

Yes but it is easy to understand by yourself, if you

@poweredbysergey 8 лет назад

Surprisingly simple!

@yaseenahmed7471 9 лет назад

I'm a beginner to learn about wireless transmission.It works well. Thank you sooooooooooo much.

@ludicscience 9 лет назад

great! glad you like it

@043-abhinav3 9 лет назад

Ludic Science hey bro can we use copper wire instead of magnet wire

@ludicscience 9 лет назад

Abhinav Pal no, copper wire will not work

@yaseenahmed7471 9 лет назад

Abhinav Pal yes bro, you can use copper wire

@mediaguardian 9 лет назад

Abhinav Pal Yes you can use copper wire. Magnet wire is copper wire. But the wire has to be insulated. Usually with a lacquer coating.

@DIGITALCANADA 9 лет назад

Amazing tutorial, simplistic and accurate approach, and to the point in helping someone understand the fundamentals. Thank you sir! Keep up the good work.

@ludicscience 9 лет назад

DIGITALCANADA Glad you like it

@vishal33377 5 лет назад

Sir I am from India. Your videos are awesome

@ludicscience 5 лет назад

Thanks!

@danielenriquepearson3303 9 лет назад

Muy bueno. Hay que ampliarlo. Seguro nos va a ayudar. Excelente.

@varitech9844 9 лет назад

no sabia que también tenia el canal en ingles, me sorprende cada dia mas. felicidades.

@ludicscience 9 лет назад

Vari Tech gracias!

@bengeltiger123 9 лет назад

I'm particularly interested in your statement "Resonant inductive coupling is near field wireless transmission of electrical energy between two coils that are tuned to resonate at the same frequency. When properly designed, high efficiencies can be achieved." How does one tune two coils to the same frequency, and what would you consider a properly designed resonant inductive coupling set up?

@ludicscience 9 лет назад

Caleb Wexler I am no expert and he subject is not easy,, you can start by reading the wikipedia entry on "resonant inductive coupling", and references therein.

@iamadityavishnu 9 лет назад

Works well. Thank you Ludic Science.

@jparky1972 7 лет назад

explained in a simple way so simpletons like me unferstand how it works and how to replicate it. Thank you.

@mugishajean6967 7 лет назад

at the first time to try this for me in 2009 it became a great deal to connect a transistor!

@robertparks2933 8 лет назад

This video is very informative!!! Please keep it up

@vinayakmandrekar7938 9 лет назад

god its working !! thanks alot.. I used battary from multimeter !! :) Thank you professor

@rubencontreras8379 9 лет назад

The absorption of energy has to be linear effectiveness can only be achieved ,as required (necessary system) I.e. from linear, ...to achieve 3 dimentional format (-x,-y,-z) motion of energy extracted inductively, mode: inverse,reciprocal, in reverse order ... Abstracting then extracting the given (@) ground (cohesive ness)I.e. from center of dimensional object area ,to the perimeter of object-domain... Applications: extracting energy from clouds, ... Reconstruction at a molecular level ,(quantum), desolution of atomic elemental configuration (only achieved by first physical isolation (physical properties of atmospheric uniformity.(quantum pressure).) Establishing a domain -1/(1/-g) let me know if I'm correct,...then expanding for intended purposes.

@LutzMichaelis 9 лет назад

Today I tried to put a 10k base resistor in place but the LED was barely lit. So I changed it back to 1k base resistor and that's working fine.

@ssuuppeerrbbooyy 8 лет назад

A bit of nitpicking: You're not actually transmitting electric energy. You generating and harnessing an electromagnetic field. Its like if you had an electric pump, sending water on top of a hill, and then let that water flow through a turbine on the bottom of the other side of the hill and generate some of the energy it took to pump it. Its basically the same process as this (though not as efficient).

@slap_my_hand 7 лет назад

I thought that this was fake when i first saw it (because i didn't think that a single transistor could form an oscillator), but now i think that this could work. I'm going to ask my electronics teacher tomorrow if he can explain how the oscillator works.

@jpmvidal 8 лет назад

Using 30 awg magnetic wire, it works with a 2N3904 transistor as well, although it gets hot.

@GadgetsBuster 7 лет назад

Use a dual coil, a npn power transistor and 5watt 330 ohm resistor. By all these u can charge your phone. i have already done this project for charging phone in clg but with many modifications.

@Fogaata 8 лет назад

Really very nice and useful, great for kids too. Thank you very much. Fantastico!

@ludicscience 8 лет назад

Thanks :)

@ashutoshmallikakaraj527 8 лет назад

how to increase strenght of indcution for a lil.bit.long distance opration ? & what if i increase the wire width ?

@atmel9077 8 лет назад

I made a similar circuit but il oscillates at a pretty higher frequency (I think here it's less than 1mhz, mine were 11.3MHz). I got the same range with only 3-4 turns and I put a 100pf capacitor in the receiver. This is called "resonant coupling".

@diwakaradduri7740 8 лет назад

Can u say the procedure to get high frequency in transmitter coil? Resonant coupling between transmitter and receiver coils?

@atmel9077 8 лет назад

The first I tried it worked perfectly but a few weeks ago I tried but it didn't worked :( I use a raspberry pi with a little software called "PiFM". PiFM is originally designed to transmit in FM with the raspberry Pi, but I used it to generate a 11.3MHz square wave signal that goes to a 4-turn coil through a 68ohm resistor. The receiver is made of another 4-turn coil, and a LED in parallel to a 1100pf capacitor.

@mozkitolife5437 8 лет назад

Great video. Thank you. I don't know why it's called "Wireless Electricity". I see a lot of wires. Resonant inductive coupling is apt enough. If it was wireless, you'd have the energy provider and the energy user, nothing else.

@ludicscience 8 лет назад

+Jason Axford Maybe is because the term is easier to understand. I don't see samsung and apple marketing its phones with "resonant inductive coupling chargers". Even if you only have the energy provider and the user, there will be wires at both sides.

@mozkitolife5437 8 лет назад

I would sooner buy something with RICC labelled on it... sounds way cooler.

@rezarazavi2362 9 лет назад

Hi ,thanks for your education. power to your elbow

@arpustech 8 лет назад

Thank you so much for explaining

@electriciandallastx9182 8 лет назад

Thanks for the tips you have discussed here.

@syeedhaiderali 4 года назад

Great Man it works. I had made it today for my friend and your circuit helps me alot

@muflatu 9 лет назад

Hi. Try to put between base transistor and wire connection 100 ohms potentiometer and will change coil frequency and increase led range light. Sorry for my English.

@MrJDOaktown 6 лет назад

Thank you! A much needed basic presentation.

@noureddinehamri5037 9 лет назад

I just wanted to tell you that i really like what you do. I'm studying engineer and physics in Paris and i would love to know how the small transistor can transforme the courant continue into an alternative one, Thank you so much

@shashankbhat2021 6 лет назад

How do you calculate the emf induced in this experiment?

@asadulhuq 8 лет назад

Excellent project. Also I liked his English.

@vidyasingh7030 5 лет назад

Thank you so much for this video! A small doubt though, is this project and tesla coil the same thing? Help to the query would be greatly appreciated.

@jaffarmajeed3692 4 года назад

Thanks a million.... It really wotks

@vikankshnath8068 8 лет назад

amazing explanation

@paulspengler8144 8 лет назад

Try adding 100 Ohm resistor in series with the + side. this will limit the current and save blowing the transistor

@arifanwari3168 8 лет назад

Excellent work brother

@ludicscience 8 лет назад

Thanks

@gsncsoccer1 8 лет назад

Very Cool. Many Thanks!

@raghum732 7 лет назад

can we use A.C source or we should use only D.C source?

@fadijabr8992 9 лет назад

Brilliant. Thanks for this experiment. Well explained. Great videos.

@ludicscience 9 лет назад

Fadi Jabr Thank you very much!

@madhesh7716 8 лет назад

I will use my science experiments

@voldy3565 6 лет назад

i have got an idea for long distance wireless electricity: maybe you can just make a simple wall plug with IR transmitter, and on the other end (the receiver) you put an led, and somehow make it light because of the IR, and make it point a tiny solar pannel that will generate electricity

@himanshuverma6427 9 лет назад

we have to take equal turn in both the coil

@williamterry3177 6 лет назад

Very good, thank you for posting

@ludicscience 6 лет назад

✌

@manasshukla8772 9 лет назад

sir can you tell another transistor that works the same.this one is not available

@nathanjaroszynski6210 9 лет назад

Thank you it is a simple and beautifull explanation.

@PhuongNguyen-nn3bi 9 лет назад

I can't understand why the transistor can make the AC current to make the induction? Can you explain more how the transistor work? Thank you so much!!

@ludicscience 9 лет назад

Phuong Nguyen The transistor acts like a switch, opens and closes the dc current thousands of times per second, in this way creates a pulse train that feeds the primary.

@jaysoncarlferrer6947 9 лет назад

Can we do that to charge cellphone? And if we can, please give us the schematics please?

@GaryMcKinnonUFO 5 лет назад

More of an air-cored AC transformer but nice demo.

@hizonopusdie 6 лет назад

how will you know which end has the negative and positive on the receiver part?

@garimabhardwaj6979 9 лет назад

Excellent innovative videos

@TonnyCassidy 9 лет назад

why a NPN transistor ? ,mosfet perform much better for this kind of application i tried your experiment using irfp250n mosfet with 470 ohm resistor connected between coil and gate,it could easily uotperformed tip41

@ludicscience 9 лет назад

Tonny Cassidy Thanks for your input. Yes you are right, the mosfet performs better, however my intention was to use a very common transistor that is easy to obtain. Some people in developing countries have a difficult time getting electronic parts. However I will make another more powerful version in a future video.

@andrewkhchan 5 лет назад

Will putting an iron core within the coil strengthen the current? Just curious

@ludicscience 5 лет назад

IT should work

@ubergeraldine 9 лет назад

Neat demo thanks!

@sargismartirosyan9946 Год назад

It can also be a DC to AC inverter or even if we add voltage multiplayer into ac current we could get huge DC high voltage ✔️🔥👀

@dhyana029 2 года назад

Does magnetic induction work with DC (battery) ? I never knew. But it worked for me. Thanks a lot

@chandrababuk3833 6 лет назад

These are a great educational video but i have a doubt in your wireless electricity 2 wich Cooper wire have been used??

@divyaaarthi4996 9 лет назад

you explained it in a simple and clear way,,,thank u.can u please explain the circuit dig. the transistor and centre tap connection.

@alfredorodriguezvillarreal8850 7 лет назад

What could happened if we increased the number of turns in each coil (A AND B)? The brightness will increase or decrease?The range the LED can be turn will increase or decrease?

@JK0Beau 9 лет назад

Will there be a difference between pulsating DC and AC like in terms of efficiency or anything? How does a pulsating current work and how does a transistor convert it into a pulsating current?

@latifambarak1861 9 лет назад

Ludic Science This was quite helpful. Working with a BD139 transistor, how will i alter the other components to make it work? What is the voltage of the battery you were using as well? Or the number of turns in the coil.

@TheCanonite 9 лет назад

Beautifully demonstrated and explained!Thank you!

@srinukancharla602 7 лет назад

can we use 38 AWG in receiver and transmitter coil and can we use 9v battery.Should we use LED which works on 1.5 v

@aayush3782 7 лет назад

srinu kancharla Ya Everything will be okay with the items you told but use a 100 ohm resistor in series with led and a non polarised capacitor in parellel

@anant3068 5 лет назад

How much Awg wire

@galorran 6 лет назад

You can help me, I made your own and it worked perfect, I would like to know a simple way to transmit at a certain frequency, the coil that has the transistor working at a frequency where the other will receive the energy if it is on the same frequency

@edgotbait 6 лет назад

Can more than one bottom coil be hooked up ? And still power the coil with the led over the other coils ?

@nikeshramnani7760 7 лет назад

i want to have the circuit of ner 50-100 turns, which resistor and what volts of battery should i go for? and are the transistors labelled physically? how to identify the terminals?

@risheekarora1507 8 лет назад

my wire is also a little less in diameter....the emmitter coil has 30 turns...and the reciever has around......could this be a problem???

@LouieMcConnell26 8 лет назад

How is there an induced EMF? It doesn't seem like there should be a time-changing magnetic flux, its just a DC battery...

@ludicscience 8 лет назад

+Louie McConnell did you see the video?

@gagandeep-oi2we 9 лет назад

i didn't have a 2n2222 transistor instead of it i used bc548b is that why my bulb is not glowing bright i used 9v battery please respond i am newer to these electrical componets

@Wolf-yp2qk 9 лет назад

The center tap is useless. I just use 2 completely different wires and wrap them the same direction together, then i run electricity through them in opposite directions, connecting one end to the collector of a 2n3094 transistor and the other to a resistor going to the base. Then the circuit works perfectly.

@Bradman175 8 лет назад

Interesting...

@HarshidPanchal 9 лет назад

but what about the diameter of conductor or wire ?

@Bradman175 8 лет назад

+Shafiq Patel you really suck at electronics don't you?

@pawanrai-fl3eh 8 лет назад

Will 2N3904 transistor work? How many coils wire. Please Help me out.

@ludicscience 8 лет назад

Yes it will

@tejavalluru3079 9 лет назад

sir,for 1.5 volts we are using 24 for turns but for higher voltage how can we judge that these many turns shoulb be used plzz help me

@ludicscience 9 лет назад

+teja valluru for higher voltage you need to increase the base resistor of the transistor. Read the video description

@TechnicalSadham 5 лет назад

This is a real video I'm try it and 100: working

@emptyengineering 6 лет назад

I replaced the BJT with a MOSFET added a transformer and rectification circuit to charge USB 3.0

@mangosquirrel 6 лет назад

Boric Acid yes

@emptyengineering 6 лет назад

Bipolar Junction transistor

@romds9876 7 лет назад

Cool experiment; how can I get more distance between the transmitter coil and receiver coil?

@jayeshchak2769 4 года назад

Hey can someone explain me the working principle in detail

@bojanolan 8 лет назад

it works on basis of lenz law of magnetism

@TheShokoor 8 лет назад

can you please explain why do we need centre tap, what is the purpose of it and how does the transistor connects and disconnects battery thousand time? can you use this configuration for an ac? thank you.

@bvgg833 8 лет назад

Hey man. I'm sorry I'm new to this concept, but could you please explain how a changing magnetic field is produced? I.e. how does the transistor connect and disconnect the battery without there being a capacitor or anything? How can it switch itself on and off? Your help is very appreciated. Thank you for the video as well!