How far can I Wirelessly Transfer Power? (Experiment) Better than at MIT?

[@mistirion4929]

Technically (if it's just about wirelessly transferring power) you could use lasers and achieve greater distances. Although the transferred power would be much lower, the distance would be much greater

[@greatscottlab]

Correct. But with my electronics background it is more about electromagnetic fields in my case.

[@a6dulsalam511]

@@greatscottlab and the laser is so direct and it could be blocked easily than electromagnetic waves ⚡

[@ShahZahid]

@@a6dulsalam511 also with a powerful laser, u have many other factors to consider like fire, blinding hazard but if u want to transmit to particular spot its the way to go and thats y many scientists think that it will be used to power spacecrafts in the future

[@imagoomanwithgoo7563]

Or a belt pulley system

[@a6dulsalam511]

@@ShahZahid That's true it's gonna be used to transmission power from the space to earth!

[@prashkd7684]

I wrote an IEEE paper back in 2012 on wireless energy transfer using planer transformers & our method showed far better efficiency and better control. The Key is achieving resonance between the Tx and Rx coils.

[@VladoT]

Let me tell you how they achieved this: They used the same principle used in the Yagi directional antenna which means that they put resonant coils in calculated distances before and after the actively driven coil in order to extend it's transmitting lobe forward. This is of course not shown in the pictures they published 🙂

[@ELECTROMAN_MX]

how you know that?

[@VladoT]

@@ELECTROMAN_MX Because the original experiment was created by a team in Croatia which they presented it in more detail before it was continued by the american team.

[@great__success]

exactly what I thought....high gain antennas were well known even in 60's and I am talking about MHz or even GHz frequencies

[@kanesmith8271]

@@VladoT Why are they going through the effort to conceal key knowledge like that?

[@VladoT]

@@kanesmith8271 I guess there will be commercial product soon.

[@MrBrelindm]

Since electromagnetic waves radiate in all directions the power available at any point away from the source will decrease with the square of the distance. This is true for typical point sources of radiation. If however, a collimated beam can be formed then the inverse square rule becomes less of a factor while aligning the beams becomes an increasingly important factor. With a collimated beam it should be possible to wirelessly transmit power over great distances at high efficiency so long as the transmitting and receiving antennas are well aligned. I used to work for Detroit Edison as a contractor in their communications department. One of the things I did in that job was to perform routine maintenance on their several microwave links between their properties. These were microwave T-1 links that were beamed between properties with low power, very high Q parabolic dish antennas.

[@conorstewart2214]

Its not so much electromagnetic waves that are transmittting power here, it is the shifting electric and magnetic fields. The fields arent particularly easy to direct which is why transformer design is finding the optimal design that minimises losses. Wireless power transfer is pretty much just a transformer without a core at a distance, all things you want to avoid in conventional transformer design. As far as I know its not that easy to change the shape of the field into a beam or change it much at all as the field naturally makes a loop but as someone else in the comments pointed out they most likely used other coils to stretch the field out and therefore give it more range.

[@MrBrelindm]

@@conorstewart2214 you would be amazed at all of the beam forming techniques there are in designing an antenna or antenna system. And basically any "wireless" transmission is radiated from one antenna to another so in order to maximizing the efficiency of long distance power transmission, applying beam forming technology is highly advised. Having several coils stacked with one driven coil, and at least 1 reflector coil, and a couple of director coils would offer a narrow cone of directed radiation - a beam lobe. Typically the more elements in a beam antenna system, the tighter the beam lobe, higher the antenna gain, and higher the Q. Of course the higher the frequency used, the smaller the antenna design needs to be. Something like I described above would obviously be a high frequency circuit and could be set in a resin pour to maintain the optimal wavelength distance between the different types of coils (beam elements) in the antenna. Another useful area of study in antenna design (I'm a former Navy radar tech) is waveguide theory. The higher the frequency used, the easier it is to produce a collimated beam of radiation.

[@conorstewart2214]

@@MrBrelindm sorry we might just be thinking differently but it seems at least in part you are talking about antennas and beam forming like the ones used for radio transmissions which is very different from the coils used in wireless power transfer which don't transfer energy through EM waves. Beam forming and long distance transmission through EM waves is totally different and doesn't really apply to wireless power transfer. Radios send out EM waves but wireless power transfer coils don't emit particles or waves like standard antennas do.

[@MrBrelindm]

@@conorstewart2214 the coils used are identical in the video and are placed some distance apart in open air. Alternating (or pulsing direct current) is applied. It radiates and the other coil is energized. That's electromagnetic propagation between the coils. When you're talking about EM propagation, you are talking about antenna design.

[@evensgrey]

The simple kind of power transfer used in things like Qi Chargers for phones or for electric toothbrushes use direct magnetic coupling of the transmission and reception coils. Magnetic field strength (once you're at a distance from the generating current loop that is large compared to the loop size) goes as the inverse cube of distance. (Closer than that, magnetic field strength is weird, and becomes dominated by additional terms in the field equations that fall off even faster with distance. If you're at a small enough distance from the generating coil, the field is as close to uniform as you want. Generally speaking, these power transfer systems have the coils much less than their own diameter apart, so the actual fields are really complicated, but transfer power with enough efficiency to be quite useful.)

[@alkaline3mc]

I am designing a wireless power transfer system right now and I had a lot of questions that your video answered for me. Great work and thank you for doing this!

[@malamu1417]

Alter du hast schon 1,5 Millionen Abonnenten. Herzlichen glückwunsch. Habe mir deine Videos schon reingezogen seitdem du gerade mal ein paar tausend hattest.

[@ats89117]

It seems like you should be able to improve the efficiency by placing a highly permeable sheet on the outside of the transmitter and receiver coils. Hope you will try this!

[@JeffGeerling]

11:17 - so... next time, then!

[@Un_Pour_Tous]

so how much was that amd video card you bought?

[@ezzeldin101]

I like Jeff videos

[@JeffGeerling]

@@Un_Pour_Tous Got it at MSRP!

[@aidan7913]

@@JeffGeerling amazing! how did you manage that?

[@512mb4]

Make a wireless pi to cook a pie then , with a timelapse

[@plmbtired]

Love the this channel!! I have been watching for quit some and trying to teach myself alot is still an alien language but you always inspire me to learn more so one day I can understand what you were talking about.

[@greatscottlab]

You can do it!

[@dougcox835]

Just remember shat when he says something is serious he really means series.

[@WarriorRev6300]

I watched 3/4th the videos of this channel.

[@ioannisnikiforidis325]

I like your approach to problem solving in your videos, keep up the good work. Some suggestions for future IPT videos: - Try going to MHz switching frequency to maximise link efficiency (13.56 MHz is a good point overall), GaN devices can help you achieve this. - Try driving your transmitter with resonant inverters (Class E or Class EF), since they provide higher efficiency (95%+ is possible) at high frequencies and low THD . - You can get very high Q's (around 1000), by using copper plumbing tube for coils, just make sure to keep the number of turns low to minimise radiation.

[@boblewis5558]

Here is a real practical solution that should be created and tested. During lockdown my car and my wife's have barely been used. Consequently, both batteries were running down. No problem I just connected (via suitably long leads) my battery charger to both cars. Works fine, but I would keep forgetting to disconnect before setting off and although the leads would just disconnect under strain, that's not a good or practical solution. IDEA: Large diameter wireless coil power transfer - need around 60 watts of transfer at around 20 volts and use a small 3-5A buck converter circuit in the car just taking the 20 volts/3 A and providing a 14.4 volt constant voltage with a 3A current limit for trickle charging the battery. Separation would need to be around 18-20cm for most cars and up to 30cm or so for high 4x4's. Transmitter coil ideally to be mounted in the drive, under concrete, slabs or blocks but power control ideally in 100% waterproof housing with max 24 volt supply from a suitable supply in the nearest building (garage, shed, house). Anyone up for the challenge? I have so much to do in our garden and around the house already that it'll be at least another year before I can get around to designing and testing one.🤔🤔🤔

[@AlienRelics]

I have that problem, too. I've recently gone on disability (the C word) and rarely drive, so my van sits and the battery self-discharges. I'm worried if I hook up a trickle charger, I'll forget to unplug it and drive away. So I'm thinking of a wireless charger that, when the vehicle is above it for a minimum time, it rises up for better efficiency. This will also contain circuitry to detect when the engine is started and automatically lower itself.

[@AlienRelics]

I've been thinking about Halbach arrays and how to build an electromagnet version of this. Should be fairly simple. 3 coils, two arranged like the bottom magnets in a Halbach array. Pushes the bottom fields up, increasing the upper fields up and higher strength.

[@leosbagoftricks3732]

Love your detailed experiments! The whole subject of wireless power strikes me as a prime example of "convenience culture" - a highly inefficient and horrendously complex idea promises to replace a 99.999% efficient $0.50 charging cable that we are just too lazy to plug in.

[@blogiblogowicz574]

you are forgetting that there is a wired charger attached to your 99.999% efficient plug (at least AC/DC conversion) - at the end of the day, if propely aligned, wireless charging isnt considerably worse (90%+)

[@Gooberslot]

@@blogiblogowicz574 Wireless charging also has an AC/DC conversion since the wireless charging transmits AC power. In fact, there's probably even more AC/DC conversions since I doubt you're running the charger directly off of mains voltage.

[@blogiblogowicz574]

@@Gooberslot correct. both have PFC + HF inverter (as in ~100kHz, dont think MHz) + rectifier. The only difference is the magnetics inbetween, which isnt as inefficient as one might think, if properly designed.

[@iskandarsyah9624]

Look at this for your wireless "charging" on steroids: kzbin.info/www/bejne/gJncoayFir9lrsk

[@blogiblogowicz574]

@@iskandarsyah9624 ahm.. as soon as I read about "overunitiy" I kinda stopped paying attention.

[@nathanial7249]

I absolutely love love love these videos Great Scott! Keep em coming!!!

[@Шокирующиеновости-д2с]

shut up you just think scott is cute lol

[@SanthoshBommadeni]

ur the best teacher i have ever seen thanks bro 😍 😍

[@TheSulross]

you can wirelessly transmit power around the planet or to the interstellar Voyager space probes so long as all your intend to do with the received power is interpret it for information encoding, which that's a pretty useful application of wirelessly transmitted power

[@andyhowlett2231]

But it's extremely inefficient. When you consider the amount of power transmitted from the ground base compared to the tiny signals received at the far end (probably pico-watts or less). Even when we consider normal earth-bound broadcasting, the power at the transmitter might be 10 kW or more, but the power received at the radio set will be in microwatts or less, even just a few miles away.

[@transistorbrains]

If you wanted to carry this experiment further in the future, you could add variable capacitors (preferably controlled via microcontroller) and then set up tests that will sweep through frequencies and capacitances until you get your maximum power throughput for given coil specs. Should be able to create some nice graphs similar to the ones for the commercial coils.

[@americamartinez5339]

do these controlled capacitors have a special name?

[@ajeethsuryash5123]

Its nice, how he writes things down along with narration

[@Miata822]

I wonder if a parabolic reflector, perhaps from an old satellite TV system, might make the generated power more directional.

[@greatscottlab]

Hmmmmm good question

[@dougcox835]

Nope, You can't reflect or focus magnetic fields like that. You could add a ferrite core though to give the field a more directional path. But you lose the nice flat shape then.

[@Mobin92]

@@dougcox835 But then how do satellite dishes work?

[@vripscript]

@@Mobin92 microwaves are not magnetic flux

[@Miata822]

@@vripscript Aren't all radio waves simply modulated magnetic flux?

[@s.sradon9782]

corporation: here's a charger that's half as efficient, 4 times slower, 10 tiems more expensive and it doesnt allow you to use your phone while chargin, but it's kinda cool. everyone: **deal**

[@theodiscusgaming3909]

The power of marketing.

[@rpavlik1]

Kids can't break your phone's charging port if you aren't using a charging port.

[@evensgrey]

@@theodiscusgaming3909 None of the people behind those charging systems are good enough at marketing to get people to bite something that obviously crappy. I think most engineers they interview look at the thing they want them to build and say to themselves, "I don't want to have THIS on my resume!"

[@arthurmoore9488]

You're forgetting the most important part. Just toss your phone on a particular spot and it's charged when you're ready to use it. Wired charging is still extremely valuable, but I don't use my phone while sleeping and it's "good enough." To not have to plug in a cable every night.

[@s.sradon9782]

@@arthurmoore9488 I just have my cable organized so it takes no more effort to plug in and it stays in.

[@thelwq]

Scott, what about using a MPPT to track ideal point of the coil and thus produce maximum power?

[@chefboyrdee1]

May I suggest using a 2 parabolic metal disks to direct the energy. At the moment it's going in 360 when you're receiver (RX) is in front of the Transmitter (Tx). An Antenna on the Rx would also make things much more efficient and capable for long distance.

[@KennethNicholson1972]

Yes, brilliant... Needs focusing, as with a yagi antenna, at both the transmitter and reciever.

[@ynzeselders4184]

Would have been interessting to see how the litz wire would compare at much higher frequencies.

[@b062838868]

incurred all of the penalties but got none of the Benefits

[@HoXDipannew]

You're the best 🤩👍🏻

[@greatscottlab]

You're breathtaking ;-)

[@Stoneman06660]

Nice! I do love your sense of humour too. Keep up the good work.

[@michaelcasper4727]

I know how you can improve efficiency - just use 2 Yagi antennas, pointed at each other. Ham radio Yagi antennas come in different sizes and most handle 100 Watts or more. That would be the most efficient "beaming" of EM energy you can get.

[@telefon72]

But you would need much higher frequencies

[@mashilmy]

@@telefon72 yeah, but not a must. Frequency is just to speeding up the transmission, so power losses can be decreased.

[@telefon72]

@@mashilmy I would like to see someone construct an efficient Yagi antenna for these frequencies.

[@AlienRelics]

@@mashilmy ?? Higher frequency is for making the antenna smaller. A Yagi starts with a 1/2 wave dipole. Even a 2m Yagi starts with a 1m long dipole, and adds elements. You need a LOT of elements to get very directional. Therefore a large antenna. Even then, you can't really go very far. Microwaves are better for directed power, because you can build much more directional antennas at more reasonable sizes, but they are STILL very large. And must go up high and avoid any obstacles.

[@X-OR_]

Forgive me if my thinking is wrong here but, the output coil is kind of like a dipole, where the electric charges are equal on opposite sides. I wonder if you can use a radiator like a on a Yagi antenna to push the unused electric charges to the other side and have more output from the coil...in one direction ?

[@bobnick9892]

That's a great idea !

[@MCsCreations]

Pretty interesting experiment, dude! Excellent work! 😃 Stay safe and creative there! 🖖😊

[@kanhaiyalalrajput3215]

This is the type of experiment that I like, in which we have to figure out the stuff by ourselves (and to construct instruments from scratch) rather than just following the pre-formed instructions of doing practicals with readymade apparatus from the Manuel.

[@electroscientist4447]

great project scott I understand why you uploading frequently recently because of the stupid youtube algorithm . very sad too think that stupid nonsense video gets lots of view .and educational video didn't ... however I hope the best for you keep up your great work ... and lastly do you have any plan about drone project ?? It'll be very interesting to see stuff like that on here

[@TutorialsGuru]

Same here. Free energy is doing rounds with millions view, but Nobody carefully reads their standard 10 Science books. Sad state of affairs.

[@omniyambot9876]

Yeahh he is getting a lot less views

[@electroscientist4447]

It's very sad when you think about it Eev-vlog,electonoob , micro-raps their avarage is even lower

[@512mb4]

This remind me of a movie, idiocracy

[@reyrank2846]

always fascinated the way you explain things.

[@glasslinger]

The best way is to use microwaves. With parabolic dish antennas you can get the efficiency over dramatically more distance than with low frequency coils. We would play around with the radar units in the army and light up fluorescent tubes a kilometre away!

[@mums2109]

Haha I love that you are branching out in your acting! *challenge accepted* Always love your work!

[@alternateracoon4872]

The handwriting is so satisfying and the way he simply explains stuff is so amazing

[@gfsm]

The MIT has some brilliant minds and money for research... I think that it's very difficult (or almost impossible) to replicate their results with the resources that most of us have... even in the university (my case). But, as always, this was a very interesting video. I usually share them with my students and other professors at the university. Thanks for your time and dedication!

[@dodge1629]

This wireless power system thing is old ... when I was I child my dad built a small AM radio that was powered by it's own antenna! It was awesome the way it works due it was using the radio signal to power on the little circuit! And tha was on 86's ....

[@jimmyb1451]

@@flexairz Received, yes. Kw transmitted. Which is why "wireless power" is such a waste of time.

[@AhmedAli-op6ng]

@@jimmyb1451 not really it is the future of EV ( TAXIS etc) search more about it. Some companies even claims and have tested it to as efficient as 94% for bulk of power more than 50 KW.

[@reverse_engineered]

That AM radio managed to recover milliwatts of power from a transmitter putting out many kilowatts. That's fine for transmitting information, but it's extremely inefficient for transmitting power. All modern radio devices (e.g. mobile phones, Wi-Fi) perform in much the same way, though often with more directed and efficient methods. But still, the receiver receives only a very small fraction of the power transmitted. The goal behind wireless power transmission is to receive a large portion of the transmitted power over a considerable distance, not just some tiny fraction of it.

[@Purple431]

I will definitely check out those older videos of yours! By the way... Would you ever build a plasma globe with tesla coil or just a simple flyback driver circuit?

[@greatscottlab]

Great! Eventually I can do that.

[@Purple431]

Nice

[@stm32user]

One of my favourite youtuber. Greatscott

[@konserv]

I remember battery-free crystal radio kits for kids. That's the kind of remote power transmission.

[@andyhowlett2231]

Yes it is, but the broadcasting stations us tens of kW and even just a mile away the crystal set can only provide a few mW for headphone listening, even when a long wire antenna is attached. The losses are way too high for power transmission.

[@Eric-qp7rx]

I always wanted a way to transfer power through a window or glass sliding door. Ive rented apartments before that didnt have a outlet outside and i wanted to plug in a light or something. Theres nothing like that on the market but i think it would be a great idea for a product. I think the technology is there for this, someones just got to do it.

[@jpsimas2]

such a small current loop, relative to the wavelength, actually acts like an omidirectional antenna on the far field and radiates the more to its side than to its middle... While you're in near field your system works, but in the moment the distance increases enough you end up in the direction where your antenna radiates the least. One way of possibly solving this is adding some sort of ferromagnetic material to the middle of the coil, so that the wavelength that matters is the one inside the material (or somewhere in between that and the one in vacuum because the coil won't be fully embedded in the material). When the perimeter of the loop is close to the wavelength (in the ferromagnetic material) then you get a directional antenna

[@RiffHarvester]

Another Great (Scott) video!! I'm intrigued by wireless charging/transmission. Also, I really like your handwriting. I'm sure you've heard that before.

[@TutorialsGuru]

Basically what we can make is an RF transmitter and field strength meter.

[@seeers0]

Thanks for the interesting video! Maybe a metal detector would be a nice project to experiment further with transmit / receive coils.

[@handyhippie6548]

you could try using soft copper water line coated with lacquer, rather than wire for your coils. it will hold it's shape better, and be easier to form, since it already comes as a coil when you buy it.

[@harshgandhi100]

Ventures into the unknown require sheer will. Its an inspiration to watch you.

[@alainsaffray4471]

Theses systems emites in all directions. It can be interesting to use directional antenna at emitter and receiver for concentrate the electromagnetic wave

[@trishanustech281]

ur videos are the most detailed videos I have ever seen!!!

[@greatscottlab]

Thank you ;-)

[@mintunath3919]

Hi greatscot great experiment. I already developed a WPT system a month ago that is without microcontroller and that can send power with 40% efficiency. And power up from 7.5V battery🔋/power supply. The distance I achived about 30-40mm.

[@sociabletech2199]

This makes me think about Nikola Tesla about transferring Wireless electricity to the his whole town. We never forget him. He was a smart man.

[@AlienRelics]

Tesla did experiments with light bulbs in a field, feeding it millions of watts. I've never heard of him powering a town this way. Citation needed.

[@sitaramchandora3104]

Love From India 😍😍😍 Awesome Content Bro

[@omsingharjit]

3:41 you are using Half Bridge with just single Supply so you are applying only half of the power to it instead you can improve it with Dual supply but It still can be possible with Single supply with relatively higher voltage by using Two Large Electrolyte cap in series will supply lines and Cap's center point Connected to the Centre point of Half bridge Through Load in between similar to Smps Circuit ( push-Pull Configuration . ) .

[@chinmaymohanty1284]

great video, as usual, years since I am watching you and you have helped me a lot to get a bachelors degree.

[@darandombomb]

Really loving the content!

[@arthurmorgan8966]

Imagine powering up small robotics within vacuum chambers to do nanotech stuff like Thought Emporium’s sputtering machine. Where battery cannot be used due to durability or physical conditions, this could be super handy.

[@sumanchattopadhyay7405]

Love your projects/videos..

[@greatscottlab]

Thanks :-)

[@silascone2276]

Loving the new intro style!!

[@Brassmonger]

Variations between capacitance and inductance for the same frequency also matters. Your load impedance also makes difference.

[@sumynona.01]

could you use a Halbach array to maximize the energy moving towards the receiver

[@BuzZ.]

Making an actual qi wireless phone charger would be really cool. I has to communicate with the phone/ stop transmitting if some metal gets on the charger so it doesn't work as an induction heater

[@evensgrey]

I don't think that would be too difficult. The charger base can obviously detect if there's something drawing energy from the pilot field. The obvious thing to do is put an RFID tag in the charger on the phone so the charger base can get a signal that the thing pulling energy from the charger base is a phone charger and not some random hunk of conductive material. That could even be used to identify how much power the charger base should pump out, since not all devices necessarily want the same voltage and current.

[@hallkbrdz]

Tens of miles with simple coils (Tesla did that). In the classroom with a Tesla coil we built with a tube amplifier that ran at 850 Khz (jammed KOA) we could easily light a florescent tube at 30 feet. Using a focused beam, or light, much farther. The problem with all but the laser - you need a ground for the return loop.

[@brettmoore3194]

Have you tried resonant rlc circuits? Use variable capacitor, var. Resistor and var. Inductor to tune. As distance increases so does the resistance so it changes the frequency. You will have to keep tuning until resonance occurs. Dual tuning forks show the same effect

[@harshbarj]

I actually did something like this when I was a kid in the 90's. I did not like having a cable running to my headphones, so I grabbed a pair of earbuds and added a small wire loop to each. I then put a LARGE coil on my stereo. Two problems (ok 3). #1. The volume was very low after more than 2 feet from the coil. #2. To get a useful distance I had to push the volume so high, the coil would start to glow in spots (was using an OLD Rotel stereo from the mid 70's). And #3. It was not stereo.

[@maertsnosmirc]

Fantastic as always!

[@BESTvsWORST-vx2dg]

wait.. by using a solar panel you can transmit wireless energy as far as you like... considering the inverse square law, you can use a laser to maximize the energy transmission efficiency without compromising distance.....

[@Sylvan_dB]

Finally. :)

[@EngineeringEssentials]

If the coil is made in a solenoid fashion, proximity effects also could be avoided, MIT students seems like they did the exact thing. Awesome video, Thank you 👍. Edit: proximity effects reduced, we cannot eliminate proximity effects in this case.

[@greatscottlab]

Great point!

[@deepakkamble3423]

Great sir 🔥 Vielen Dank für das sind alles Informationen. 😊

[@ShahZahid]

ah man i was waiting for this video

[@greatscottlab]

I hope you will enjoy it :-)

[@chetronics]

About 16 years ago I was experimenting with tesla coils and managed to light an led from the other side of my apartment. The collector was a capacitive panel, not a coil. Also I remember the diode being integral for the conversion. Now I wonder if I tried it again with a faster diode what the results would be.

[@highvoltage8527]

I have made a similar experiment with 2 Tesla coils and the 2 leds where lit up at the 5m distance.

[@great__success]

sure, but at what efficiency ?

[@eideticex]

@@great__success A system with tuned coils can reach incredibly good efficiency. However you lose mobility of the end points to get there.

[@highvoltage8527]

@@great__success with my experiment it was like 8W on receiver and 30W on the transmitter.

[@helidrones]

In the 1980s I‘ve achieved encouraging results at about 1 MHz. My setup basically consisted of an oscillator made out of two 2N3055 and two ferrite rod antennas.

[@CryptonNite23]

FULL BRIDGE RECTIFIER!!!!! ElectroBoom will be proud!

[@mikegraham7078]

I notice that not only is the MIT coil five winds instead of six, it's also evenly spaced out along a 'cylinder' rather than being a clustered bundle. Might that make a difference in forming an effective coil?

[@ZAR610]

Very nice job! Really interesting! Thanks for your work!

[@greatscottlab]

Many thanks!

[@KillerNetDog]

To get the best efficiency and distance you need those coils to be accurately tuned to be resonant at the frequency being transmitted and received And you want the antennas (coils) to be as directional as possible as that will increase signal strength at range.. Look to Ham radio antenna theories, You may be getting more power reflected back at your transmitter from your coil than is being radiated by it.

[@akaskmsskssk6927]

Nice vid, learned a lot, you should do more experimental videos like this

[@myturkishlife1777]

Another well thought out video 👍

[@ezequieladrianminniti6252]

Excellent video. Keep it up!!

[@acestudioscouk-Ace-G0ACE]

Thanks for sharing this, I enjoyed the learning experience here.

[@abhilashdutta8463]

1:09 yep a man of culture.

[@lynes2peters438]

Pls explain xd

[@electronic7979]

Excellent

[@robbytheremin2443]

Based on my practical experience with amateur radio, skin effect isn't a major issue up to several megahertz. My kilowatt amplifier uses inductors made of copper tubing above 20 mhz.

[@MrGridStrom]

You are you electronics GOD of youtube dude!

[@anshumanpanda4962]

Love your videos !

[@sam7901]

You could attain much higher frequencies using GaN fets. If you take care in choosing the core of your magnetics (To bring down core losses), you can have a very compact design

[@DSteyn86]

Have you ever considered moving away from perf board and getting a CNC mill to mill your boards? It has a much better look and makes building the circuit board much more of a pleasure.

[@captainheat2314]

milling PCBS is so easy you can even use a regular 3D printer with a RC motor to mill it with the tiny mills

[@pranavchippalkatti2850]

@GreatScott u r truly great !!

[@AhmedHan]

Did you measure the magnetizing current of the primary side?

[@publicmail2]

Try ionizing fluorescent lights with RF at a distance. I bet this is more efficient?

[@bsand1746]

You're awesome! Love your videos, thank you👍

[@nadimfetaih3841]

Have you seen the 5G wireless power setup? It seems SUPER promising. I don't remember who set it up, but they basically made a card to take in the 5G signal and power IoT devices. I'd love to see you break that down and try it out!

[@cap459690]

Tesla patented the pancake coil for use in high voltage high frequency power transmission, perhaps try keep the coils from overlapping, it would change overall diameter but give a greater area of effect and lessen transmission losses

[@logicawe]

Really cool experiment 🐱 thanks for sharing 👍

[@midnightgadget3459]

loved this one mate.

[@sauritinfo2248]

After hours of doing college assignment, many diagrams, many graphs, and sleeplessness.........this is the video I wanted to watch....... 😀😀😀😀😀

[@ЕвгенийДюбайло]

great doing!hello from Belarus!

[@projectartichoke]

Don't forget about collimated microwaves and rectennas. They offer much higher efficiency over far greater distances.

[@69iqtutorial]

Nice video, i think the max power can be transmitted by making a zvs circuit at the primary side maybe and making the secondary tank circuit with a wires having much more strands of wire

[@greatscottlab]

ZVS does not improve this.

[@samarthguleria788]

He is going towards efficiency and distance

[@69iqtutorial]

I mean, zvs can generate a sine wave with more that 3× peak voltages

[@davidmoody2562]

The secret is in the frequencies. At certain frequencies, transmitted power has virtually zero resistance, so minimal transmission loss.

[@HealthInsuranceSahiHai]

can you make a video about a fully functonal wireless lithium ion battery charger with a small coil like 6 to 7 cm?

[@ratgreen]

Id love to see you get some decent power, say 10w+ from this. Would you try again with bigger coil, high freq etc? I'd love to see that