To those wondering, yes this really works. It took me a while to troubleshoot it (it didn't work right off, you'll see why) but I will say you absolutely need the 1k resistor. In another DIY article I read stated that the resistor will reduce the power and help the longevity of the LED. My LEDs are rated higher so I figured I didn't need it. Coil wouldn't work until I added it. Now I get to move forward with my project! Thanks for the tutorial!

The soldering was amazing! It looks like how I fixed my fan controller in my 1988 Honda Accord.

For those of you who want to try to build this I can confirm that it works just fine with the parts listed and for the information that is not precisely described, I created coils of a diameter of 49mm (basically I didn't have a thin style coke can and guessed at around 5cm) I found a tube of silicon gap filler used in a caulking gun was 4.9cm so I went ahead with that. I used the copper wire as described in 0.4mm following the number of turns and orienting the ends opposite each other and the central loop at 90' to those. When I tried the experiment with 0.63mm wire I did not have success. But with the components listed, 0.4mm wire at approx 5cm diameter it worked beautifully! Good luck! And thanks The Q for a really satisfying project I did with a student of mine.

This is excellent! Just what I needed for a project that I am working on; my big hang up was the oscillating voltage, and this has just solved the issue! Thanks for this.

Pretty simple and electronically very cool! If you're wondering how it works, it's like a "reed oscillator", but with a transistor, not a relay. A coil can't generate large fields without an oscillating voltage (like AC), but he's using direct current from a 9v battery, what gives?! Well, coils are inductors and when you pair that with the resistor/transistor magic happens. The transistor is the key here, it's acting as a gate using the feedback from the inductors building voltage, but that feedback isn't immediate, it takes time for the voltage inside the coil loop to build strong enough to turn "off" the transistor gate. Then the voltage collapses, and the gate opens agian and the cycle starts all over again. So it oscillates! The receiving coil connected to the LED is capturing current from the power-sides building/collapsing magnetic field. Try this with more/fewer loops on one or the other side and measure the voltage (hint transformer). To learn more look up 'feedback oscillator' or 'Colpitts oscillator'. This is also what's makes the "switch" in the switched-mode power supply or DC-DC converter.

Ironic how much wire it has.

I used a 1.5v double a and it still worked, awesome video.

The led is pretty dark. This is because you don't use the resonance frequency of the coils. You also should use capacitors at the end of the coils. GreatScott! has a good video about wireless charging. I definitely recommed you.

Semplice, chiaro, perfetto. 👏👏👏

thanks dude i have been working on the same but was using normal magnets now i will try electric magnet which is your idea thanks alot

or perhaps reduce resistance, remove transistor and add a capacitor. tune both coils to center frequency to have a little more power at the receiver, as well as the range. P.S. resonant scheme works for AC sources

WHY ARE THESE SO SATISFYING TO WATCH? COME ON

Thanks bro helped me to complete my Holiday assignment. Thank you very much😀😀😀😀😅.nice video👍👍👍

amazing, i hope that you make a tesla coil in next video :)

This is a really great project for groundschool wow

I keep try every single craft but I don't get it as good as your good work man.

Nicely shown, Wireless Power transmission experiment 👍.

This is excellent. Can you please tell me what different mediums there emf can pass through. Like, will it pass through a wall?

It's works! I use bc547 transistor (NPN) and 1k resistor. When I use 10k resistor it didn't work but when I use 1k resistor it's works! ( 27k or 10k it's too much resist)

The project looks amazing

You're possibly the fastest growing KZfaq channel ever!

is it possible to do this with a small ring inside a bigger ring? (im thinking of putting a project together where the device gets charged by being put upright in a base)

You do to much cool stuff it's amazing

c' est vraiment trop cool ce que vous faites vous êtes vraiment trop fort 💪💪💪💪💪👌👌👌👏👏👏👏👏👏👏👏

great you just reinvented transformator.

thanx bro your video teaching me

I would like to share some tips.... At first mine wasn't working and the transistor was heating Then I removed the resistor. And interchanged the connections of battery . It started working.!!!!😊 Ps. You can use as many windings and Size of the coil..... Comment for furthur suggestions and questions...

Is this an induction coil? Does the secondary coil attached to the LED need to be thicker wire?

You need two capacitors to cancel out the reactance of the coil.

Would a thin metal of tin like on a mailbox for example still work instead of the paper?

Increase range? Loss factor? Thanks!

ai vn giơ tay 🙋🙋🙌🙌

Allow me to comment. This your design, the way you built it, will cause the battery to drain quickly and will not be the LED that will drain it, it will be the transistor. For you to have a 90% efficiency and more amperage I suggest you use a BD139 transistor with 2 ceramic capacitors (same values) and 1 diode. One of the capacitors goes into the collector of the bd139 and the other capacitor goes into the receiver along with the diode to do the polarization. I can charge AA batteries and also those larger ones that comes in laptops. Of course the charge is slow but this is even good as they extend the useful life of these batteries. 👍😆

Can you connect the coil that was connected to the battery in series?

cool . can u tell me why transistor and resitance were used and what is criteria of its selection ?

If mutual inductance works on the principle of EMI then by using DC source how the power is transmitted to LED.

if i roll the coil more than 30 turns, can the range be farther?

Simple,neat & clean project.🤞

This based on Electromagnetic Induction. When we change position of coil the magnetic flux the changes and induces emf and from Maxwell theory, change in electric field produces magnetic field . And also applied source is DC so electric field constant but changing position of another coil flux changes current induced.

your channel video is my favourite bro

Is there a way to amplify the signal?

How well would this work with ac on a smaller scale, if at all?

more loops on the receivor side means lesser voltage more current right?

you helped me with my science project!

Thank you so much bro,🙏🙏

may I use 22k resister . please reply

Incredible... Works Perfectly.

This is a MAGIC !

Can we solder the LED bulb legs(+ and - ) on any side of the copper coil? Please reply fast

What has to be changed to increase the amount of electricity that can be transferred across? Thanks. I'm knew to all this.

Amezing sir 👌😊

Amazing you inspire me so much

just curious as too why the resistor and what effect would a stronger or weaker resistor have on the output?

in your next video can you teach me haw to make a refrigerator ! that would be cool and cool for your millions if people who would watch it !

Awesome

works on the principle of mutual inductance.you can incresa the coupling coefficient of the coils by introducing a dielectric medium bw them

1:55

I'm thinking about implementing this into scale modelling. How can I scale it down?

Hey can I use any transistor like that?plz reply.

What is , if i do more turs, on both, do the range get higher?

rat tuyet good i am duong in vietnamese

I need to say it worms and it is amazing. I have tried with o.5 milimetars wire.

How would I go about installing a wireless coil directly into the phone/tablet? Can i just permanently wire the input to the board, will that effect any data transfers or external charging input?

Can i use solar panel instead of battery and mobile (through OTG Cable) instead of LED.

Can I use any other resistor like 22k or 47k or should it be only 27k because I can't find one in my area

So what do the transistor and resistor do here exactly?

Idk if this is correct but I found a way to make a DIY transmitter. You basically need aluminum foil and copper wire. Just take the aluminum foil to make a base for it and to connect it to a connecter. Also, don't forget to add a coil in between the aluminum foil and transmit the signal and add the 3 add on parts for the transmitter to have a good signal.

What happens if the turns are less or extra

How can you calculate the power transmitted and received for this please?

AWESOME SIR 😊 You Are The Best Magician.

Challenge: The Q must make a video involving no cardboard or glue

i did this without the resistor and it works

Is the voltage in the air coil ac or dc.I think dc as it is not turning on if I connect the coil to +- rather than _+ of led

what modifications we need to do to obtain power transmission for the distance of 2-3 metres

Does it work with a 22k resistor?

Hey I have doubt, do we have to make more rounds if we are passing more voltage through it???

Superb 👌👍😎👏

This is basically an air spaced power transformer inducing current from the primary to the seconary coil similar to how a wireless phone charger works

by taking 60 turns it would be more powerful so there could be a bigger distance, right?

Mr q what kind of welder do you use

So, it's basically an oscillator and a transformer (in which the 2 coils are not connected)

this is simply inducing current by the magnetic field of the coil attached by the battery.

Can i use other resistance

That's amazing.

my 2n2222a is getting very hot! What can I do about it?

Wouldn't you need a resistor at the LED and maybe a bridge rectifier?

Wär ich doch auch so klug ✨

What type of resistor are we supposed to use?

(Pardon my English 🙂) Can anyone explain me how is this working as an oscillator as there is no capacitor used above. How ac power is being produced?

can I use 2N2222A transistor?

It's working upload more videos

The magnetic flux is the most important in this phenomenon

Thank you

Tried it. Didn't work. Wondering why? At first I used just copper wire, then I tried it with enamel copper wire. (I swear I connected everything correctly) Does the diameter of the coil matter? Mine looked a little thicker than yours.

What happens if I used different enameled gauge of copper wire

if my battery is 5v what resistor should I use?

Could I use a 10k resistor and a C1815 transistor as a replacement?

I am making his coin sorter right now.

awesome brother👌👌👌👌👌

Does it work with me any type of transistor