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Step 7: Extra Hardware

I have now added a AC to DC diode bridge which converts AC to DC. Then i added a Joule Theif to the diode bridge, which is a very simple circuit that can amplify input power (the Dc voltage from the diode bridge). http://www.youtube.com/watch?v=gTAqGKt64WM

This allows the LED to be lit when its father away from the coil, because the voltage going to the LED is higher. It is now able to power DC devices.

<p>Why did you select a specific frequency? Are you trying to match the wavelength to the length of the wire? </p>
<p>MIT did't invent this its like 100 years old</p>
<p>damn right they dint invent this, it was Nikola Tesla, how can MIT claim to invent a device that was created 100 or so years earlier, Teslas main coil that would of supplied the world with free wireless energy was dismantled and sent to a dark room in A51, MIT are wrong to claim they invented this when they obviously didnt.....poor tesla ripped off by everyone he worked with including Thomas Edison, and Einstein, and now he's been ripped off again by a school</p>
<p>Thanks for reminding people of the source of it all. Piggybacking on other people's invention and claiming it as their own. Electricity as generated today, Wi-Fii /Bluetooth to Electronic as we use it today without crediting Nikola Tesla </p><p><a href="https://en.wikipedia.org/wiki/Nikola_Tesla" rel="nofollow">https://en.wikipedia.org/wiki/Nikola_Tesla</a></p><p>the same in space theoretical sciences with Immanuel Velikovsky assertive theorieson ...</p><p><a href="https://www.google.com/#q=immanuel+velikovsky" rel="nofollow">https://www.google.com/#q=immanuel+velikovsky</a></p>
Nicola tesla
<p>I guess this is how a transformer works. Good instructable, BTW. Worth giving a try.</p>
<p>Is it possible to use a sine wave instead of a square wave I found a cheap function generator on sparkfun but it only produces sine waves. Also if the wave was of higher freauency could it transport higher currents?</p>
I can't understand the schematic :(
please help me i can't understand the schematic :(
<p>That's true :V</p>
<p>Does it really work?</p>
<p>Can we use this for charging a mobile??</p>
<p>no...... it doesn't have that much current output......... </p>
So can't we increase the input current and use higher current components.... I'm new to electronics
<p>it's not my design brother.............. you need to ask the author ...... but what i think is....... that......yes..... you might need to upgrade the components ....</p>
<p>What grade of copper was used, like width/size of the copper coil used?</p>
<p>A remix 2.0 ........ i've taken part in the contest with reference to this instructable ...... please support me friends..... thanks robotkid249 for the inspiration......</p><p>everyone please have a look to my instructable http://www.instructables.com/id/Wireless-Power-Transmission-Using-AVRs/</p>
So I made it..... I needed a function generator..... But it costs too much..... So I made it of my own..... And friends if you too need to make one of your own..... Check my instructable for &quot;DIY Function Generator&quot; Ain't advertising..... But just want to help all people out there........
<p>It was 1970 when we had a science fair in Olongapo city (philippines).i was in 1st yr.</p><p>Jackson high school when i saw this 120 volts AC 50-watt incandescent lamp hanging by a cotton string lit up about 6 inches away from a ferrite rod coil and circuit board.That got me hooked up in electronics.</p>
<p>What do you think of this circuit - https://www.youtube.com/watch?v=4UmVLfFNx7U . I think this is the simplest and cheapest system I have seen. Can this work with your primary coil?</p>
can you get ahold of a hertz-uF ratio for me. I would like to tamper with this concept if you don't mind.<br>
Would someone please provide a better schematic? I'm not sure if I'm building this wrong, but mine is not working, I did a lot of troubleshooting and etc but unsuccessful.. Any help would be appreciated..
i love this
<p>Has anyone built a WIFI Power Harvesting circuit that will power an LED as yet? If So please let me know the scematic, thanks. </p>
Can i use wifi or bluetooth emission to power a led, if so could you explain...
Do the inductances have to match between the two coils have to be the same?
<p>Yes</p>
no, however the number of coils on both sides along with the distance between them (called the mutually inducive element) and the load you use will affect the applied emf to the secondary circuit.
oh so this will transfer power no matter what. If the the base and reciever were tuned to one another though there would be way greater efficiency, right?
If the Circuit reached resonance, there would be voltage/current magnification, which you may have to consider when choosing your components. the advantage would be that energy would only be dispersed A, in the resistive element, and in the space between the coils. i looked it up, and every time the distance doubles, you lose magnetic power by a factor of 4.
the load will have effect? How do you take that into account? So this way is just two arbitrary coils that will couple together. If you tuned the base and receiver to be in resonance, wouldn't that transfer as close to 100% power transfer as you can get?
here two capacitor of value .01 uf are connected in parallel or series???????
<p>parallel</p>
Parallel.
This is an amazing guide! Very informative. Thank you
<p>Aren't the exposed wires dangerous because AC is passing through them? How can this be insulated safely without affecting the resonant properties of transmitting and receiving coils?</p>
Looks like low voltage to me
<p>The power is so low that it won't hurt you. </p>
Thanks for the reply. Would that still be the case if I were to build a unit capable of powering a 40W 120V light bulb wirelessly? Would the conductive socket of the bulb and other exposed wires need to be insulated then?
<p>Well done but my main target is &quot; Transfer of electricity &quot; completely without any single wire. As we join hands in that research, we should also focus our aims at long distance applications. Let's connect at, aliganyirataddeo2014@gmail.com. </p>
<p>I see a heck of a lot of wire for something supposedly 'wireless' .</p>
wireless as in you are not physically hooking your device to a power source other than putting the receiver on it. make the receiver penang and you have wireless power.
<p>could you tell us the formulas required to calculate the values to prepare the primary and secondary coils and also the ratings of the components used to construct the required circuit to achieve the specific output(i.e voltage and amperes). </p>
Couldnt you use a crystal resonator on the secondary coil?
<p>Over doing it! Quartz resonators are in the kilohertz range.</p>

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Bio: I'm 17. I enjoy making cool stuff, and promoting the "maker" community. Vote for my space balloon in the hurricane laser contest and hands ... More »
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