How to Make Wireless Transmission of Electricity/Joule Thief
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- Опубликовано: 5 фев 2015
- How to make wireless transmission of electricity based on the joule thief circuit for lighting LEDs and a piezo buzzer. Shows step-by-step how to make the transmission coils, the joule thief circuit, a bit about transistors, and making the receiving coils, along with some demonstrations.
For the spreadsheet for calculating coil dimensions, go to:
rimstar.org/science_electronic...
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Go to the main channel page here / rimstarorg
See also:
How to mount/attach transistor to heatsink (2N3055/TO-3 package)
• How to mount/attach tr...
Make a Joule Thief for Zombie Batteries
• Make a Joule Thief for...
How to Make Joule Thief Light a CFL - Jeanna's Light
• How to Make Joule Thie...
Pyramid Hologram - How to Make/How it Works with Princess Leia Hologram
• Pyramid Hologram - How...
Inspired by slider2732:
/ @slider2732
specifically these three videos...
Simple Wireless Electricity System:
• Simple Wireless Electr...
Simple Wireless Electricity - Part II - The BAC's:
• Simple Wireless Electr...
Simple Wireless Electricity - Part III - Diversity:
• Simple Wireless Electr...
MongrelShark also experimented on them:
/ @mongrelshark
Follow behind-the-scenes on:
Twitter #!/RimStarz
Google+ plus.google.com/1163951251362...
Facebook / rimstarorg
rimstar.org
Music used throughout:
Bicycle Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
creativecommons.org/licenses/b...
ISRC: USUAN1100870 
Наука
Awesome experiment Steve!
Grant Thompson - "The King of Random" Thanks, Grant!
I miss grant
i dont mean to be offtopic but does anybody know a way to get back into an Instagram account?
I stupidly lost my login password. I would love any assistance you can give me.
@Michael Onyx instablaster =)
@Kase Keaton i really appreciate your reply. I found the site through google and I'm trying it out now.
Takes quite some time so I will reply here later when my account password hopefully is recovered.
I watch these video with my dad and we love them, of course sometimes they are hard to understand because english is not our first language but your explanation make them easy. Thank you!
Awesome video RimstarOrg. In my mind this video is an instant you-tube classic. I love the efficient way you fit a tonne of info about your building process into one neat package. You rock! Peace!
At last... How to make the simple wireless transmission of electricity system. Enjoy! And there's more on the webpage too rimstar.org/science_electronics_projects/wireless_transmission_of_electricity_power.htm, including oscilloscope shots.
RimstarOrg that is short distance. is it possible for long distance?
I don't know how to get longer distance. I did test if this produces radio interference and it does on the shortwave radio frequencies, but only detectable up to a meter or two. I wouldn't want to go much further for that reason.
With a long distance wireless power you have to have a ground connection in your coil. The receiver may be miles away and it has to have a coil wound in opposite direction to the transmitter coil and also be connected to the ground. The longitudinal signal actually travels through the ground connection at speeds of 2*Pi/C or at 1.5 times the speed of light. Your receiver will get the energy from the transmitter without losses. If interested check out lectures by German Engineer Konstantin Meyl or the American Eric Dollard. This is all old Tesla's technology :)
Great tutorial. I like the tape method your using. Good to see some variation.
That fine wire coil is pretty cool, couldnt do that any other way.
Thanks for the mention :)
Mongrel Shark Thanks. Yeah, the fine wire one was the first successful receiver coil I made. It actually holds its flat shape quite well. I'm not sure what else you can make with that technique but it's almost like working with composites.
I have to say... I really enjoy your videos. Thanks for making them.
Wonderful demonstration sir.
I wish I had your knowledge and experience to help with my EE exams.
Thanks for sharing
Maybe someday wireless energy transfer will make it possible to fly my RC planes without an on-board battery ;) That would be cool!. Nicely demonstrated Steve. -Ritchie
SonicDadDotCom I would definitely like to see that Ritchie! Even if you got it to just hover over the transmitter that'd be cool. -Steve
I did A few videos with a small motor. Might be posable to get a small heli of some kind to hover over the transmitter.
ruclips.net/video/gkEStQeiu2Q/видео.html&
Mongrel Shark Now that you bring it up I remember seeing that motor when you first uploaded that video. That also reminds me that slider2732 also got a helicopter motor running, but not flying ruclips.net/video/vvQMsv4o8jA/видео.html
That's right I remember that one now.
Nice project! Really nice coils too!
Makerj101 Thanks! I see you've been taking some time off and enjoying my videos. :)
RimstarOrg Yeah I was going on a marathon and doing some catching up! :D That's what I always do. I never keep up with subscriptions... I just go and watch all of one persons videos at one time.
grt video! thanks
Thank you very much
I never understand but I always enjoy...
***** Enjoying is good. I'm just glad you're watching, Tom.
NO PCB needed, loved it.
Juel Pereira Yeah, who needs PCB. Just find something non-conductive and put your circuit on it. I especially like using transparent plastic, pretty neat looking circuits that way. I did that with my 555 timer music player ruclips.net/video/WM1bZgBqDl4/видео.html
RimstarOrg I found some hard fiber composite sheet(about 3 mm thick) and it worked, i wont need PCBs for a long time, thanks for the tip
A very nice How-To and thanks for the shout out :)
I find that superglue works best, but tape is a good practical alternative.
To reduce current by a large amount, a diode in series on the Positive and ~100ohms in series on the Negative works well...also fixes any transistor heat issue.
No resistor is needed if running on an AA battery, just a transistor and coil.
slider2732 Thanks. I didn't want to use up all that superglue, and tape is cheaper, plus I wanted to offer something different. From the suggestions I'm getting in these comments I smell a follow-up video sometime in the future, so thanks again!
Do you know how it works
So this is basically one large RUclips collab
Very cool
great video also an idea for you is to build a tesla coil.
Hi sir,
I am really like your video with how you explain it detailed. So may i requested some tutorial to how to run an old hardisk motor maybe with a simple circuit?
any help would be great :)
and Thank you very much for your attention sir :)
thats pretty cool thing :)
That's a Beautiful thing.. I had a crazy thought, what would happen if you made the receiver coils into a LC tank circuit ? You'd have to tune the Frequency to match with the transmitter, maybe double it, or any multiples of 2.,
I have 150 feet of coaxial cable, it's been hanging on the wall for years. I though I'd never use it. Thank You, Mr. RimstarOrg.
Yeah, making the receiver an LC tank circuit should increase the efficiency. Let me know how it works out if you do that. Have fun! -Steve
Hello rimstarorg...i want to ask you..if i make the receiver to charge my phone with the electricity wireless...should it work?...i want to do this project in my university...can u explain it
It should be possible but you'd probably either have to make changes to your receiver based on the output of this wireless transmission system or make changes to the wireless transmission. As I haven't done it myself, nor looked into it, I really can't say what would be needed to be done.
How much voltage do you get on the receiving side with the thin wire? Your idea has given us the idea of sealing our electronics inside our rocket so they don't get wet, and using a cylindrical outer coil to induce a current inside the rocket that we will rectify and pass into a LiPo charger circuit. With concentric cylindrical coils for the transmitter and receiver, it should work like an air core transformer and we should be able to produce different voltages depending on the winding ratios, correct? Once again, nice job!
Rockets? ROCKETS??? I just found something new to subscribe.
Wow. Thanks! You came at a good time, we have several videos almost ready, so the frequency of releases should be high for some time.
USWaterRockets
Count me in on a Subscribe to your channel too !
If I may advise, cos I love this idea for rocketry power transfer. Output can be 30V from just an AA, but works similarly to solar in that it will drop heavily with a load. A single AA wireless system to a 1.8V and up Chinese Lipo charger works fine, as tested here (12 turns telephone/modem wire). Perhaps an idea to charge a supercap rather than lipo ?
If you have different rocket stages, a flat pancake each side is most efficient, but conicals work well, especially as receiving coils.
Primary turns optimum is around 12, more = less current used but less range, fewer than 9 and the circuit may not start up. Depends on power needs, but if a small rocket + weight is premium, I would advise SWES2 coils (20 turns around a pills bottle for example) and 1xAA so no resistor is needed.
To run motors - a single diode is often good enough for rectification. For circuits, a diode off each receiver wire in opposite directions (half wave) and a 100uF electrolytic to smooth.
slider2732 Wow! That's great information. We use really small LiPos (
USWaterRockets
Am enjoying your channel and the cool ideas, such as the 3D printed end caps.
433MHz, aha wonder if that's using an Arduino and the Ebay Chinese modules...light, cheap. can be lost in a field without financial burden lol.
Yeah, if you affixed a bendy film type solar panel you could attach it flush to the rocket side.
Instead of a coax cable, try using a trough like cable. The opening of the trough allows EMF to escape only in the upwards direction. This should increase the efficiency of the coil in the open direction only. Maybe splitting the outside braided shield of a coax with a razor then opening it up a bit.
Could you replace the led with a 12 PC fan
Definitely a cool circuit. only thing I found to be a pain was the winding of the large coaxial cable. It yields a good end result but is not necessary as you can find similar results by simply winding a 'ring' of wire of about 25-30 turns 30awg or similar.
+Magneticitist Thanks. I guess if you spaced the turns of the 30awg wire out you could get the same working area. You could use the technique I showed of winding the wire on the tape for the receiver to spread it out. If I had speaker wire that would have been a lot easier than coaxial cable.
RimstarOrg
haven't tried speaker wire but that's a good idea. I have a ton laying right next to me so hmmm.... might need to try it.. The coax definitely creates an interesting relationship between the windings though.. I remember a long time ago I made a bare JT circuit which was really wired more like a SS Bedini SSG circuit and I used about a half spool roll of RG-6 coax I snagged from an old dish install job. It wasn't in pancake form, but oscillated nicely, and I remember there being some pretty interesting voltage readings between the windings. It was just so big and beefy I thought it to be impractical. Ultimately when it comes to these circuits I seemed to be able to find roughly the same results with varying coil shapes and sizes, so long as I found the right tank circuit combination via capacitance in parallel with the base resistance.
Thank you very much for sharing this. I thought a coaxial cable was designed to shield a signal from noise. The outer casing (mesh) protecting the inner wire because of an effect similar to that of the faraday cage. I have seen it used with satellite dish/antennae. Is that not going to limit the emitting capabilities? Perhaps the mesh is grounded in ordinary use that is the only difference I see. Very cool anyway.
bah mah I've wondered about the same thing, but not enough to come up with any answers. The mesh isn't grounded in this case, so maybe there's something there.
you could use old cat5 cable and connect the conductors in series to get a higher voltage. (or something)
I made one of these and it works, but the light isn't very bright, i used a 330 ohm resistor and several other kinds that i had ( i don't have a 470 ohm resistor), and it was a little bit brighter, but i have a 10k potentiometer, would that work for this project?
Scotlahn Mccallister You could try the 10k potentiometer. Just turn it a very little at a time since it's cramming a lot into a wide range. The bottom 500 ohms is only 1/20th of the total range. If you have smaller resistors then you could connect them end to end to add up to other amounts. That's actually what I did first.
DEAR sir m new to electronics as m pursuing my 1st year diploma in electronic i want to learn more. sir what if i connect the power source instead of DC to AC.
what will the required modifiocation that i need to make.
Hi! Would you have a Tesla Coil build?
I put a voltage meter to everything and there was current flowing through the resistors and the transister but once it got to the coil end it was a voltage of 0. So it may be the transister. Thanks so much!
Great! Let us know how it goes.
I don't have a 470 ohm resistor is there another resistor that would make the led light up as good as 470 ohm ? Respond soon and keep up the great videos !
sciencenerds You could connect multiple smaller resistors together end-to-end to add up to around 470 ohms. It doesn't have to be exactly 470 ohms. (Sorry for any delay in response. RUclips doesn't seem to be notifying me of all comments at the moment.)
Hi again. I tried this project and I could not get it to work.I tried the schematic you showed and the 2n355 transistor just gets a little warm and so does the 400 ohm resistor but no light lighting up. so I thought I got things mixed up on the transistor so I switched the emitter and the base wires around and all that did was get the transistor very hot. But still no light. then I switched a few things around on the battery holder wire because i thought I had gotten those backwards but still no luck. Have any idea with what is going on?
What are you using for you batteries? How many volts? Make sure they're fully charged batteries.
What are you using for a transmission coil? What is its diameter?
What are you using for your receiving coil and circuit?
The batteries I am using are 4 AA batteries in series to make 6 volts. They are all fully changed (Band new out of the pack). I also tried using a 5V AC adapter.
The transmission coil is 18 gauge speaker wire with a diameter of about 4 to 5 inches if i'm not mistaken. It has a total of about 13 turns. Made with about 7 feet of wire or so.
The receiving coil is also a speaker wire coil but of a smaller size. about 2 to 3 inches in diameter and 9 turns. Made with about 5 feet of wire.
I saw a video on here on RUclips by a RUclipsr named Ludic Science and he demonstrates the exact same circuit but instead with 12 V of power applied to the bifilar coil. He uses a magnet wire receiver coil instead of another bifilar coil, which I also tried but no luck.
Hmmm... From everything you say it sounds good. Maybe your transistor is no good. If you have an oscilloscope then you can look at the output of your receiver coil. A voltmeter will at least give you some idea.
Will it effect of I make 20 turns for recieving coil
20 turns should work for the receiving coil. The one I show at 4:21 is only 15 turns and the others have more. There is some ideal number for resonance but I think that's not your problem. Off-hand I can suggest experimenting with different amounts of resistance like I do at 5:09. And make sure your transistor is connected in the right way. Also, make sure you have at least as much battery power as I have and that the batteries are charged.
Hey! I Made This project for a science fair, and they asked me a question "why there is energy loss in the led?" and what can we do to increase the range ?
+Syed Irfan Ahmed There's energy loss from the transmission since we're capture only a small portion of what's transmitted. Regarding the LED itself, I guess there are the usual heat losses. The only ways I know to increase the range are to increase the power going to the coil and to make a receiver coil and circuit that resonates at the frequency the transmitter is transmitting at. I think someone gave some tips for that either in these comments or in my other introductory video about this.
What frequency is it? Did you check for RFI on broadcast and shortwave bands?
dictare It's 22kHz. However, the 2nd part of each cycle is a dampened wave at around 4.1MHz. I tried it with my shortwave radio, and sure enough, there's interference. Thanks for the suggestion. I just put scope shots up on my webpage rimstar.org/science_electronics_projects/wireless_transmission_of_electricity_power.htm
Hopefully it doesn't propagate too far. You may be mistaken for a drug operation!
www.policeone.com/drug-interdiction-narcotics/articles/8224280-How-cops-are-catching-grow-ops-with-AM-radios/
dictare Good point, re causing RFI in general. I just checked and no more RFI was noticeable after around 1 meter.
Really cool. Does it work the other way around? For example if you tap the piezo, will it transmit electricity back that can be sensed with an ADC on an arduino? To make a wireless vibration sensor?
Theoretically yes, but I think the piezo buzzer I use in this video has additional circuitry build into it which might prevent that. If it was just a plain piezo connected to a coil then tapping the piezo would induce a voltage and current in the coil which you then transmit a small signal.
Do you think it would be possible to fit a piezo and coil in a small plastic box about 5cm in diameter that would transmit signals about 5cm away to another coil with an arduino when the plastic box is struck? Do you have any ideas how to construct such a circuit?
The box can't be bigger than maybe 7cm but the recieving coil can be as big as required.
I really don't know. I'd have to try it to find out and unfortunately I don't have time now.
@@RimstarOrg Thanks, I'll look more into this :)
how did you get changing magnetic field?
nabil alriashi The circuit that the coils are attached to is popularly known as a joule thief circuit, a type of blocking oscillator circuit. It's what makes the field keep changing. It's too much to explain how it works in a comment but I have this video explaining how it works ruclips.net/video/0GVLnyTdqkg/видео.html
Does the Transistor get really hot? I might try this out with a Tesla Coil.
Landau Martin It does get hot pretty quickly. However, slider2732 said in a comment below "To reduce current by a large amount, a diode in series on the Positive
and ~100ohms in series on the Negative works well...also fixes any
transistor heat issue."
What kind of voltage drop do you get at the receiver?
sketchyssk8shop I just added some scope shots of input and output on my webpage rimstar.org/science_electronics_projects/wireless_transmission_of_electricity_power.htm The input is 5 volts DC with a 3 volt cycle on top of that. The output is 12 volts peak-to-peak. So the drop is 7 volts, if that's what you mean.
I have a dumb but burning question. Would this circuit work with 5 volts? Thanks!
It probably would work with 5 volts. On my webpage here rimstar.org/science_electronics_projects/wireless_transmission_of_electricity_power.htm you can see oscilloscope shots where I'm showing it running with just over 5 volts.
Can I care my phone with this? I have one of those phones that says it can be charged wireless.
Rimastarorg could you replace the led with a fan
sciencenerds A fan wouldn't work as easily as an LED. You'd need to put what's called a full wave bridge rectifier circuit between the output wires of the receiver coil and the fan. It's not a hard circuit to make, just 4 diodes and an optional capacitor or you can get a chip that does the full wave bridge rectifier part for instead of the diodes. Do a search on full wave bridge rectifier to see. It's still not guaranteed that there'll be enough power or the right voltage to run your fan. It would take some experimenting or measuring.
random question. if you put your phone near this. does it mess up the wireless signals coming off the phone?
+123woefie I can't answer this, I don't have a cell phone. Maybe someone else can say. The frequency is different so theoretically no, but the signal may be messy so I can't say for sure.
Modern phones works in digital, not analogue so any noise, unless extremely severe, would be fixed by your phone's internal error-correction.
Play around and see if you can find a signal strong enough and in the right range to really get under your phone's skin. You should notice it lose connection to its tower if you have done it right.
hi friend if i want a 38 mhz pulse all i add is the crystal 38mhz?
Just adding a crystal won't do it. If you go with a crystal then that's a whole other circuit. If it's a four-pin crystal then you won't need much more than the crystal, like I didn't need much for this AM radio transmitter ruclips.net/video/_4-Sx-T6VBc/видео.html, but even then you'd have to check the datasheet for your crystal. If it's a two-pin crystal then you'd need to do even more but I don't know what. In any case, I haven't tried wireless transmission of energy using a crystal so there may be other factors which I'm not aware of.
ohh woow really damn you cant really help me then iam not too good building circuit. i been trying for the pass 3 week but not sure how still
Have you tried making a circuit? If no one's done it that way before then maybe your option is to try it.
Why you don't use resonnant circuits for a more efficient transmission of energy ? :)
maxitechnic I plan to try to use resonance. From all these comments I suspect I'll be doing more work with this.
Could this be made to be used with a qi charged device like a cell phone?
Brian Carrizales I don't know. Maybe someone else here does?
ok thanks anyways, if it could that would be amazing to put on a computer desk
Is your job a electrical engineer Steve so your good at making electronics?
What needs to be done to increase the range from inches to feet?
Keith Tucci I don't know exactly, or how possible it is, but Power Max gave some suggestions in his comments above, which I might just try out. It would be great to get feet.
I made a really big coil for longer distance transmisson, but i can't get the LED to light constantly, it only lights when i detach the negative from the battery. I have tryed switching resistors from a wide range, 10 Ohm to 1M ohm but it never seems to work, there are 4 wires inside of the wire but i'm only using two, also on my last coil i made, i was able to transmit wirelesly with only 1 1.5v battery and 10 ohm resistance. But please help me solve the problem with the new coil. -Thanks
Scotlahn Mccallister I recall you said you had another version working previously, but are you sure when you made this one that you connected the wires going to the coils correctly? Based on what you describe, it only lighting up when you disconnect from the negative, it's possible you have the wiring wrong. It's also possible you just don't have enough energy to energize the coil enough. If your wiring is correct then try more batteries connected in series and then again in parallel.
Well, it seems I got the wiring wrong, I connected the emitter wire to the collector, thinking it was the emitter, I looked at the circuit again and well, I figured it out, and it works great! I can power it with one AA battery too, also I got the potentiometer to work perfectly with this circuit. Thanks again.
Scotlahn Mccallister Glad to hear it! Thanks for letting me know. Have fun.
Will it work in circle coil
You would need a different oscillator circuit. In the case of this joule thief circuit, the coil is also acting as part of the oscillator and so it has to be the way it is.
i finally new how to make it
Ivan Paul :D It does take a while. Since the first video I had to try other things, and then there's just refilming it all and taking the time to edit it all together in an efficient and effective manner. Have fun making it!
does this work for 5 volt supply?
Yes. You can also find the schematic here rimstar.org/science_electronics_projects/wireless_transmission_of_electricity_power.htm.
Can i use on 1 kohm resistor..
I can't say for sure. As you see in the video, I used trial and error to find what resistance worked for my setup.
Hey can i use ring coil
You would need a different oscillator circuit. In the case of this joule thief circuit, the coil is also acting as part of the oscillator and so it has to be the way it is.
if I use bc547 transistor instead of power transistor ,it works or not?
Probably not. That's not a high power transistor.
RimstarOrg can u tell any other power transistor which we can use other than u used in the vedio
almost 6W to power a 100mW led. That's sad :(
i read startship (or something like that, it looked like a star) coils have a more vertical field, i wonder it that would work better
Hello Can I largest wireless signal and Thanks
Ali Azazy I'm not sure that you're asking, but if it's how to transmit farther an easy solution is to use a higher powered power supply. The transistor will need a heat sink in that case. But be careful not to transmit too far, no more than a meter. This emits AM frequency waves and can interfere with other radio signals. There are also some modifications you can make to the circuit to make it better but I haven't experimented with those yet.
i made one of that,but i cant get higher than 100mA on the output..i want to know if you can get upto 1A of output.. i wanna use it to charge cellphones on top of the table..
vrich marketing renewable energy You could increase the input power and play with the resistances, but check for heating of the components when you do. However, I don't know if that will get you up to 1A.This does cause radio interference in the shortwave radio frequency range. I detected it up to 1 or 2 meters away, so I wouldn't want to make it so strong that it transmits much further. You can test this by putting a shortwave radio nearby.
Thaks a lot rimstarorg..so its not practical to use this as cellphone charger..
vrich marketing renewable energy
I don't know. I've never tried.
Can I charge my laptop? and any phone with this by making receiver?
U day You can probably do at least some charging. I don't have any idea how fast they'd charge. I also don't know what additional circuitry you'd need on the receiver side.
music reminds me of primus
can I use this circuit for the secondary winding of a Tesla Coil?
Landau Martin I really don't know enough about Tesla coils to say.
No, if you're looking for help with Tesla Coils check out 4hv.org
RimstarOrg I mean using it for a big coil wound around a pvc pipe like how you see in Tesla Coils. I didn't mean a real Tesla Coil, though.
Landau Martin I dunno. I guess you could hook it up on one side of an autotransformer (en.wikipedia.org/wiki/Autotransformer) though I don't know how good it would be.
Use mosfet n ch
IRfZ44 r drop pin gate
180 ohm vcc 3vdc
Does resonance exists in the circuit with LED, even if it does not have a capacitor?
Yes, the coil has capacitance.
I used the same materials as in the video (except that I used a net cable for the inductors) but, it doesnt work. The transistor is the same as the one you used, but it doesnt have the letters to identify which one is base or which one is emitter. Is there another way to know that?.
Also, I made the two coilswith the same diameter. I don't know if that may be the problem
I usually look up the transistor's part number online to find the datasheet. There's often a diagram in the datasheet.
The coil diameters will affect the resonance. Try testing different resistance values like I did around 5:02 in the video.
when i did this my led was flickering continuosly. why?
I don't see why it would be flickering. Maybe someone else here as some ideas?
There is no step-by-step construction of 'how to make a wireless mobile phone charger' on youtube. Can you please show how to make one. Reply if you will try or not.
harsh bawari That's not something I'll be trying at this time. But thanks for the suggestion anyway.
I wonder if I could use this to charge my old electric toothbrush.
Sir I did but it doesn't work
reason for using transistor??
It's part of the oscillator circuit that makes the fluctuating electromagnetic waves. The circuit is the joule thief circuit (aka blocking oscillator circuit). You can see more about this circuit in my How a Joule Thief Works video ruclips.net/video/0GVLnyTdqkg/видео.html.
#Professionas_circuit_diagram
wireless night light, weak phone charger, wireless power to millions of homes, like tesla himself imagined(maybe not)? Sooo many possibilities. Thanks physics
In 'Murcia, it is usually pronounced 'sodder' ;) Don't know why there is a random silent L in it though, although I wont argue with it since it is easier to say it that way anyway.
its more like "sodir" or "sawdir"
Re I'm not sure, but I will just stick with their pronunciation, sä-dər:
www.merriam-webster.com/dictionary/solder
Power Max its diffirent in all dialects lol
Power Max Yeah, it depends on where you live. I used to say "sodder", then someone from somewhere in the internet messaged me that it's "solder", and since it's spelled that way, I switched to saying "solder". Then later someone else messaged that it's "sodder" and then I realized there are two correct ways to pronounce it. But for some unknown reason, in this video I started saying both! :)
Power Max Oh, as for the "random silent L", just looked it up. It's from the latin, though interestingly it was dropped from the spelling for a few hundred years and then put back www.google.ca/?gws_rd=ssl#q=solder+word+origin
My Large Coil is 25cm, its enough right?
+Syed Irfan Ahmed It should be enough, yes.
+RimstarOrg its not working for me :/ if i send you a picture of my circuit can you identify the mistake please
+Syed Irfan Ahmed It should be easy for you to compare with the circuit diagram I show in my video. The biggest mistake is getting the wires going to the coils wrong since they're the opposite of what you'd expect. But if you still can find the problem then sure, you can send me a picture or pictures. My email address is at the bottom of all my webpages (rimstar.org).
This is cool. But instead of a table for the coil sizes, you could try using maths to calculate the spiral length: www.intmath.com/blog/mathematics/length-of-an-archimedean-spiral-6595
I wonder if we'll ever do "proper" wireless transmission like what Tesla claimed to be investigating in Colorado Springs and for the Wardenclyffe Tower. There was once these guys trying to crowdsource their research on the subject. What do you think?
rt.com/news/170468-tesla-tower-rebuild-project/
Another cool thing these kinds of pancake coils can be used for is rocketry! fastmhz.com/?p=33
DigGil3 :D Sometimes I'm a little too DIY. I didn't even think to look it up. Nice simple formula though. Thanks.Re the tesla tower, it looks like they didn't get the funding. I have wondered what bad, or just interesting, side effects would result, mainly with the Earth side of it.
DigGil3 Oh wait, I take that back. Not so simple formula. :) But it may be possible to make a calculator on my webpage to make it easy.
RimstarOrg I once had a one-formula derivation for this, but I don't remember where I have put it. Just so you know that there "is" a simple formula. Maybe with a little more googling or a time to derive it again...
DigGil3 So far it looks like there are simple formulas (doable on a calculator) that give an approximate result and not-so-simple formulas that use an integral and give an exact result. The error for the approximate one isn't too bad, off by 3% for one comparison I did. Here's one such set of formulas www.giangrandi.ch/soft/spiral/spiral.shtml
As my led us not glowing
try to make a wireless mobile phone charger. i am waiting for it
How to build rotor blades from pub piping
2022?
Mount a small pancake to your cell phone and u get wireless charging
Raymond Bivens I've thought about that but if you have to mount a small pancake to the phone every time you charge it then you may as well mount it in a regular charger instead. Unless you mean permanently mount it. That would make sense.
I ment a computer fan
Yikes, it looks like you're applying solder to the iron tip and not the joint.
Justin Bell Truthfully, I was just focusing on getting the shot. :) When I looked at it after I almost took it apart to redo it but was pressed for time.
I want to have these devices installed in roads and do away with batteries in cars as well as reliance on gasoline. And I want to power them by having every building turned into an energy producer and transmitter doing away with transmission lines.