How to Make Wireless Power Transmission 

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!

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.

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.

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

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

Ironic how much wire it has.

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

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.

I have a problem. When i try to light the led, it works for a second and then i have to move the position of the tranzistor and the copper wire from the + pole. Any suggestions?

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)

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

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.

Will it work without transistor and the power source is a 220V ac ?

What about doing this without soldering iron / glue gun ots still working right?

Can i use a potentiometer because i do not have that resistor?

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.

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

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

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

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?

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.

WHY ARE THESE SO SATISFYING TO WATCH? COME ON

Excuse me sir , why we using a transistor hare , cant we maks it without transistor ? , I mean simple inductor wire with two points directly connected to the battery , it would be something like transformer but without irone core , cant we do this , or we use transistor cause there is any matter of frequency there

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

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

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

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

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

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)

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

So does the transistor act as an inverter? Because you cannot transfer DC power through induction.

This is probably a stupid question, but if you touch the copper coil while it is connected to a battery, would it shock you?

i have a question... it is dc source and i have seen in your video that you left the coil steady and it the bulb is still glowing... how is this possible because either you need to move the coil or the flux must be changing... but as this is connected to dc source, flux will remain constant.

Please answer me, did it actually worked so that I won't waste my resources on it

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

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

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

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. 👍😆

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

The 2n2222a transistor I’ve used blasted with the 20 loop 20 turns , 40 turns for the receiver with my 7.23v lithium rechargeable 9V battery with 27 k resistor. Please let me know what did I do wrong. Connected -ve to the emitter and +ve to the loop. Collector to the other end of the wire.

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...

What happen if we use c945 transistor, dose it work?

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

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

I wanna do it in a pretty long range .....Is that possible?

Will it work if I used 30 turns at primary and 100 turns at secondary?

Why did you use a transistor in the primary coil? Because DC does not create changing magnetic field, unlike AC?

what is the thing he used for connecting the wires securely?

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

Why did u take 30 turns of enamelled copper wire??..

I build this project but my reciver side is not workings. How check it out put comes from input side

(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?

Question can this work without a power source. Or does that break the law of conservation of energy?

Where do you get the 27k resistor? Amazon only seems to offer above or below that

What if i use a non insulated copper wire while making the coils

my transistor is heating up but i kept power supply on for more time, then my transistor catched fire i tried multiple transistor but all started to heat up what could be the problem (I am using 5 volt D.C. bench power supply)

I know it is a silly question but I'll still ask it . Have you used the transistor as a diode or an amplifier

Would this be able to pass through glass?

So what do the transistor and resistor do here exactly?

My circuit is not working I have used the same resistor Pn2222a transistor 9v battery Why is my circuit not working plz reply fast .

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

Can i use it with 12 v lithium ion battery

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.

Can I know why you have used transistor here.

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

Can I use 2N2222A transistor? Please reply fast..

How about if i want to construct an advanced wireless power transfer system?

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

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

Hello I made the project and it is working but the intensity is very low. Can u tell me what's the problem

Amazing you inspire me so much

so you only use a resistor and transistor. no capacitor?

You're possibly the fastest growing RU-vid channel ever!

is it okay if using enamelled copper wire 0.2 mm ?

You need AC current to do this, but batteries have DC current. I’m guessing the transistor changes the current, but how? I heard you need more than 1 transistor to switch a current like that too

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

is it working for metal wires

Sir can you tell me which glue you are using. Please reply me fast

Nice man!! Why do we need transistor??

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

Hey bro I have a poblem after making this When i pass electric current it works only for 3-4 sec and then again it stops working so can u tell me the solution

Can we use 22k resistor??? Please reply ASAP!

will this current run through a thin sheet of plastic?

what are transistors and resistors for?, i just dont get why couldnt someone just put a battery, and the copper wires together

Can you explain what is going on because I think that it will not work because the mutual induction only works on A.C or by moving the coils back and forth

MY transistor get heated up when I supply it 9v, and after some time LED stops working or get dims.... plzz help as sooon as possible pllzzz

Does it work with all types of wires,?

Bro if we make more rounds then will the range increase

Dude I have make this exactly as you have made it and it doesn't work. Do you know where it could be the problem?

How is this wireless power transmission?? 2 inches?

great you just reinvented transformator.

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.

cannI ask what is the use of the transistor there?

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

Can i use 2N3904H331 transistor

Does it work with a 22k resistor?

can I use f2222a transistor? plz answer fast

what is we use dc buzzer instead of LED

Bro is we can transfer wireless power from AC to DC??