Introduction: Wireless Electricity Transmission (Simple Things Required to Be Collected From Scrap)

Wireless electricity is something new and exciting. While its core principles are fairly easy to understand it can quickly become overwhelming for the average person. I faced a similar problem, I found the whole thing rather overwhelming to understand due to the fact that there were many different things that I felt I needed to understand to be able to make one. So lets get to it! and here's a video of it working:-

Step 1: Things Required

To make this we need :-

1) NPN Transistor. I used the transistor from my old telephone pcb

2) insulated copper wire that I took out of my old cfl bulb

3)Resistor 1 Kilo Ohm. I took it from old telephone circuit board.

4) L.E.D light

5) A 1.5 Volt AA Battery or CMOS battery would work similarly.

Tools required :-


2) Matchsticks or lighter

Step 2: Collecting Things From Scrap

For transistor search in the old pcb if you find it then solder it from the circuit board .For resistor :-

  1. search on internet about its color bands
  2. search in pcb
  3. remove it from the pcb

Step 3: Circuit Schematic

Here is the diagram of the device. Diagram is also present.

Step 4: Making Receiver Coil

First of all take the insulated wire roll that out and with wires,make a coil of 30 turns around a round object.Tie roll on the ends of the wires, to not make it messy.Make sure that the turns must be 30 only.

Step 5: Making Transmitter Coil

With the same round object, start coiling again. This time when you make your 15th turn with the wire, create a tap and leave a wire of 3 inches and then coil another 15 turns. Now you have a coil with two ends and one tap.Tie knots on the ends of the wires, so that it doesn't uncoil by itself.

Step 6: Scraping Ends of Insulated Wires

Melt the insulation from the ends and the tap from both the coils..Use lighter or matchsticks for it.

Step 7: Join L.E.D to Receiver

To make the receiver, just take receiver coil and connect its ends to the leads from the L.E.D.Make sure that the ends of coil are not insulated.

Step 8: Joining

Take the transistor, and place it so that the flat side is facing up and the leads are facing towards you. The lead on the left is the Emitter, the lead in the middle is Base, and the lead in right is the Collector. Take the resistor and connect one of its ends to the base of the transistor. Take the other end of the resistor and connect it one of the ends (not the tap) from transmitter coil. Take the other end from transmitter coil and connect it to the Collector of the transistor. If you want you could connect a small piece of wire to the Emitter of the transistor (It would work as an extension of the Emitter.For more clarity please refer the diagram.

Step 9: Joining Battery

Just take the tap from transmitter coil and connect it to the positive end of the battery. Connect the negative end of the battery to the Emitter of the transistor. Now if you bring receiver coil with the L.E.D close to transmitter, the L.E.D lights up!This seems to be dream!

Step 10: Making Enclosure

Just take a cardboard square and join the transmitter to it arranging it yourself with that switch so it doesn't run out the chemicals from the battery.

Step 11: Done!

Electric and magnetic fields are created by charged particles in matter such as electrons. A stationary charge creates an electrostatic field in the space around it. A steady current of charges (direct current, DC) creates a static magnetic field around it. The above fields contain energy, but cannot carry power because they are static. However time-varying fields can carry power.[16] Accelerating electric charges, such as are found in an alternating current (AC) of electrons in a wire, create time-varying electric and magnetic fields in the space around them.

Suggestions for improvements are more than welcome. Good Luck with your project!!! Please vote if you like!



The Life Hacker (author)2017-02-06

Just curious, what is the range of the transmission?

fourfingers made it! (author)2016-09-22

Thanks l made it and it works very well, mounted the battery etc on a square cut from a margerine lid, used a brass looking paper clip the ones with the two legs you bend over trapped the tap from the coil under it and used a couple of small magnets to hold the wires on the battery.

laith mohamed made it! (author)2016-09-13

Its awesome

laith mohamed (author)2016-09-11

Simple and good ... go on

inspecter gadget (author)2016-08-29

Cool! Yes, Tesla Was The Man! Define Madness & Genius? ----A madman uses his genius destructively, A Genius uses his madness Constructively - Nicola Tesla was the latter! born in the wrong time, a gentle sole and abused by the greed of other more influential people of his time! Did someone mention Edison? ;-)

jbike made it! (author)2016-08-20

Works great!

frankg1 (author)2016-08-15

Didn't Nikola Tesla go broke and insane chasing his wireless electricity dream.

jgraham26 (author)frankg12016-08-15

If I recall, Tesla's troubles began when Edison entered the picture. It's not a pretty story and frankly, downright tragic. I lost a lot of respect for Thomas Edison.

ggadget (author)jgraham262016-08-20

I agree.
I've lost all respect for Edison after I found out what a shister and thief he was.
Tesla is within the top two of the world's most genius humans that ever lived. In my mind, being equal with Davinchi.

MrE (author)jgraham262016-08-17

Edison was a well established inventor and much older than Tesla. Tesla worked for Edison.

In 1882, Tesla moved to France, where he began working for the
Continental Edison Company, designing and making improvements to
electrical equipment.[46] In June 1884, he emigrated to New York City in the United States.[47][48][49] He was hired by Thomas Edison to work at his Edison Machine Works on Manhattan's Lower East Side. Tesla's work for Edison began with simple electrical engineering and quickly progressed to solving more difficult problems.[50]

Tesla was offered the task of completely redesigning the Edison Company's direct currentgenerators.
In 1885, he said that he could redesign Edison's inefficient motor and
generators, making an improvement in both service and economy. According
to Tesla, Edison remarked, "There's fifty thousand dollars in it for
you—if you can do it."[51][52]
This has been noted as an odd statement from Edison, whose company was
stingy with pay and who did not have that sort of cash on hand.[53]
After months of work, Tesla fulfilled the task and inquired about
payment. Edison, saying that he was only joking, replied, "Tesla, you
don't understand our American humor."[52][54]
Instead, Edison offered a US$10-a-week raise over Tesla's US$18 per
week salary; Tesla refused the offer and immediately resigned


jcaresheets (author)frankg12016-08-15

Yeah I was thinking not all that new. Still like the project though.

cuyler1 made it! (author)2016-08-18

i built this from several of the wireless light ibles. i used a BC547 25 turns for the led half and 12 turns next turn center tap and continued on with 12 more totaling 25 turns for the power half out of 28 gauge wire, AA battery and without a resistor. works from 2" above brighter close to nil. in pictures the led is lit through a pot pie pan.

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Awesome! Keep up the good work! Really innovative!

cem (author)2016-08-14

> Wireless electricity is something new and exciting.
LOL. Check out Tesla.

Nyxius (author)cem2016-08-14

wireless electricity is simply radio energy... and it is not new. In fact it is very old. Tesla IS responsible for our AC grid, but there is a reason why we're not powering devices with radio energy. (i.e. I assume you like to idea of not being slow roasted in your sleep by the radar antenna in your living room).

cem (author)Nyxius2016-08-15

Dear Nyxius, Tesla is the inventor of Radio (together with Marconi, US courts acknowledged that Marconi used Tesla and Locke's patents long after).
Tesla's main area is not AC, but wireless. He is also the inventer of remote control. He devoted his life to transmit energy/information wirelessly. He was able to lit wireless lamps up to 50 meters away from the power source. And he did not roasted! (being rosted or not depends on the frequency of EM waves).
He was also using electric discharges (similar to lightning, electron flux) to transfer thousands volts and ampere electric wirelessly. He erected a tower in NY to provide wireless electric to NY but failed.
Check out this picture from 1890:

cem (author)cem2016-08-15

Beside Nyxius, what author did is electric induction, not RF. You should not mix induction with radio frequency propagation.

Nyxius (author)cem2016-08-16

Actually induction and RF are the same thing. They are both closed forms of the maxwellian equations. One can actually excite an induction coil with RF and vice versa. Most of the time you cannot make the one without the other due to imperfections in tuning and materials. I am very familiar with tesla's and Marconi's work. Tesla was not strictly interested in AC or wireless, he was interested in electrical oscillations, and in particular resonant structures in electrical oscillations. I know all about his wireless lamps, and how the RF spectrum interacts with chemistry. Even with imperfect absorption there is still some interaction (chronic exposure). There is also huge efficiency losses which is why we use a wired grid. If you look at tesla's setup you'll notice that his lamps were powered by induction and that induction was achieved by tuned RF. Also I did not mix induction and radio propagation. Induction dipole transmission efficiency drops with 1/r^3 and photonics drop with the surface of an expanding sphere namely 1/r^2. If you look at the math you'll find that 1/r^2 is the limit of the dipole as the distance becomes large relative to the size of the dipole. If the dipole does not oscillate, then the 1/r^3 holds because there is no radio energy being created and the limit goes to zero.

cem (author)Nyxius2016-08-17

Dear Nyxius, you were saying that Tesla was responsible our AC grid, now you are saying Tesla was not stricly interested in AC or wireless.
Sorry but, in contrary he was extremely interested in AC and fought a war with Edison over AC/DC debate and won. He was extremely insterested in wireless electricity that he spend his entire life and fortune on it. Of course his Tesla coil is a major invention on resonant structures and oscilations but he was strictly on AC and wireless world.

RF induction and magnetic induction are not same. As you stated their propagation differs. Today, magnetic induction (close setup coils or transformators) are used widely in industry and market because of it's efficieny. Wireless chargers for electric tootbrush, GSM, even electric cars... Induction ovens and cookplates are basic examples of higher power applications. Electric motors are magnetic inductors.
RF induction is rather inefficient but at higher frequencies it can be redirected to target, for example you can feed a small drone wirelessly using microwave.
There are projects for example, harnesing solar energy in space and sending the electricity to earth by microwave or laser. Without enough eficiency engineers would not consider any of these practices.

Nyxius (author)cem2016-08-17

Tesla was responsible for our AC grid. I would suggest you review what I said carefully. What you find I said was a logical subjunction not an exclusion. Tesla's fascination with resonance is what led to his development of the AC grid, inductive power, and radiology. As for his fortune, tesla never really had a fortune. He had a contract that said he was entitled to a fortune, but he ripped it up. That generous act was what allowed his business partner to win the economic war with edison. Tesla was supported in perpetuum by his sponsor.

As for the second paragraph, your statement is demonstrably inaccurate.

Just remember, you made me take out the math...

Faraday's law of induction states that the gradient cross product (aka Curl) of the electric field is the negative time rate of change of the magnetic field

(Grad X E = -delB/delT){

Ampere's law states that the curl of the magnetic field is proportional to the sum of the free current and electric gradient over the product of the magnetic and electric permeability.

(Grad X B = J/(m*s^2)-1/(m*s)*delE/delT){}

Taking the Curl of Faraday's Law gives:

Grad X (Grad X E) = -del(Grad X B)/delT

You can now substitute Ampere's Law into the second part to get:

Grad X (Grad X E) = -1/(m*s)*del^2(E)/delT^2

Since the product of m*s is c^2 (which is the speed of light squared) we can quickly see that this is the 3 dimensional wave propagation equation for light.

(summed up nicely here:

You'll please notice the delE and delB are required for any oscillating system (including radio and inductive systems) since a static electric field or magnetic field gives zero values. This conclusively requires any oscillating electrical system to generate photon energy, and induce currents in any interacting charges. The frequency of the photon is determined by the frequency of the field. For most electronics, sub visible spectrum frequencies are the only ones realistically achievable.

I hope that this has conclusively demonstrated to you that magnetic induction and radio induction are in fact two cases of the same thing.

If not, then I will refer you to Hyperphysics for further reading, and I hope that your troubled mind eventually finds peace.

IanLang (author)Nyxius2016-08-17

I'll tell you what, that's got to be the most complicated way I've ever seen to say both need an electric and magnetic field! :O

IanLang (author)IanLang2016-08-17

By the way, has anybody tried shoving the Tx coil up against an AM radio and seeing what happens?

M2aestro (author)cem2016-08-15

Anybody who knows this history should understand what we would be dealing with here, and that this hardware does not need to be very complicated. Most of us knew of the Marconi work first, I would venture to say, and that work should show the tinkerer easier ways to do what is discussed here.

The first time I tried to use the EM waves to power at distance was in an attempt to make an amplifier that required no battery for operation and was supposed to amplify a crystal detector's AM output signal, using tuned AM circuits detecting a powereful area transmitter to power one of the first cheap audio frequency transistor amplifiers. I'm not certain that I got more than a few dB boost, if that. It wa fun, however.

David Weitendorf (author)cem2016-08-14

Right on bro. Someone here knows a little history!

qqqqqqqqqqqqqqqqq (author)2016-08-14

Isn't this a modern take on a crystal radio?


It's an air core transformer with an oscillator circuit to excite the coil. See you need the field to not only come on but collapse again to transfer the energy to the other coil. This is why all transformers are AC not dc


Be interesting to slap this on the oscilloscope and see what sort of waveform turns out. What do you think, sawtooth?

Nyxius (author)IanLang2016-08-17

I would think it would be a very lopsided sine wave. A sharp peak on one side followed by a slightly less peaked reverse relaxation and charge up. I would suspect a large amount of damping due to the transistor. Wiring a Zener diode in parallel with the transistor would probably decrease the amount of damping.


No, it's a bit different. It's an induction coil, or pair thereof. For a crystal radio you'd need a capacitor and a germanium diode in there too.

Nyxius (author)IanLang2016-08-14

The transistor functions as the capacitor and diode in this circuit. When the current flows the wrong way it builds up a parasitic charge that can momentarily power the coil. For more info look up joule thief and armstrong oscillator. THose are both similar types of circuits.

IanLang (author)Nyxius2016-08-14

Yes, it's a kind of relaxation oscillator,but you still couldn't use it as a crystal radio though. The inductor's not variable, nor the capicitance, and you'd struggle to demodulate through a transistor and I'm not sure the impedance would be high enough to drive crystal headphones. In addition you'd need a long antenna and a ground wire.

Nyxius (author)IanLang2016-08-16

You are right on all accounts. I was merely pointing out the similarities. Being able to change the capacitance or the inductance is what allows the resonance frequency to be tuned to that of the incoming radio signal. This design allows neither. Also the switching potential required by the transistor is at least an order of magnitude more than your normal zener diode.

milestogo (author)2016-08-15

I shot an arrow into the aether. Nothing happened.

IanLang (author)milestogo2016-08-16

Surely it made an ethereal parabola? :) Besides that you were quite unlucky to have no effect, because when I do experiments like that the outcome is usually a lot of flashing blue lights and it seems to attract police dogs.............:)

Nyxius (author)IanLang2016-08-17

You had the Ghost Light visit? All my lights were red.

jgraham26 (author)milestogo2016-08-15

How do you know? What specifically did you not see that led you to that conclusion? (Sorry, I couldn't resist.) :)

Nyxius (author)jgraham262016-08-16

Absence of proof is not proof of absence... just saying.

jgraham26 (author)Nyxius2016-08-16

Ah yes "absence of evidence does = evidence of absence. At least this is true for UFOs. I agree in any case. ☺?

skarydrunkguy (author)2016-08-17

isn't wireless electricity called lightning?

jmorpuss (author)2016-08-17

1975 NASA wireless energy transfer using a rectenna can be viewed on youtube

Mohammade9 (author)2016-08-15

the induction coil size is disturbing :)

a little suggestion, you may want to generate much higher frequency using your transistor oscillator, therefore you can use smaller N induction coil (number of coil turn).

anyway, this is simple but awesome project to demonstrate the "magic" of electronic :D

GregoryL20 (author)2016-08-14

Basically, this is a transformer with an air core.

cem (author)GregoryL202016-08-15


g0dor (author)2016-08-14

Its a fascinating area but I suspect all the research has been done and found to be wanting for high capacity requirements.

That said, the plugs/sockets on small devices can soon get damaged so this system works well with such devices where the power requirements are fairly low.

This kit is on eBay at stupid money and supposedly delivers > 500mA @ 5V

IanLang (author)g0dor2016-08-14

With regards to power: there is a thing that works on a similar principle that they use in schools here, although I haven't seen the full circuit specs. It works by running an induction loop round a classroom which carries modulated audio from a microphone the teacher wears. The audio is then transmitted into wearable hearing aids for deaf children. I'm told (but haven't seen for myself) that it gobbles a lot of power in the transmitting stage. Nobody seems harmed by it, so I'm going to see if I can adapt Mr Singh's project to do the same albeit on a smaller scale. With regards to other comments on here, I'm a qualified electronic engineer (BTEC) but have never done any proper work with electro-magnetic loops like this so this is a good starting point for me and I suspect a lot of other people and I thank Mr Singh for putting it on.

g0dor (author)IanLang2016-08-15

Hi Ian.

Induction loop systems have been available for years in the UK.

Under disability discrimination laws organisations are obliged to provide them.

Here is a link that may be of interest

I suspect that Bluetooth systems might be a cheaper option in future

Regards - Phil

DonEM (author)g0dor2016-08-15

Capacity is scalable. The Tesla electric car has an option for wireless-charging, by parking over a transmitter pad. Artificial hearts have been developed that use wireless-charging to recharge batteries implanted under the skin. Aluminum tanks can have power delivered internally from outside, etc.

I've compiled a few good links on wireless, now an old list...

g0dor (author)2016-08-15

Wireless is induction ?

JimB144 (author)2016-08-14

So you reinvented the Transformer ? How much energy would be required to realize usable power on the other side of the Room ? They have connection free cell phone chargers.

wmendes1 (author)JimB1442016-08-14

Several modern products are made based on this principle, including Wi-Fi. Being a maker is not about inventing only, it's also about learning and using the resources available.

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