Simplest Wireless Electricity Transmission Experiment




Introduction: Simplest Wireless Electricity Transmission Experiment

About: Just do things, electronics, woodwork, etc.

Hello everybody, today I want to show you very interesting and very simple wireless electricity transmission experiment, in fact the simplest air transformer. I really like circuits like this, impressive and elementary in the repetition.

Step 1: Components

So lets start, we need transistor 2n3904, or almost any similar NPN transistor, any LED, also we need cooper winding wire 0.1-0.5mm about 15 meters, I use 0.13mm or 36AWG you if like. You can find a suitable wire in almost any needless transformers.

And that's it, it’s all components we need for this project.

Step 2: Coils

First we need to make 3 coils, 30, 60, 90 turns each, for a temporary frame I used 1 ½ inch pipe, place a piece of tape sticky side out, glued one end of the wire, and wind 30 turns, than fix the coil and pull it out from the frame, leave 10 centimeters wires for installation. Same with coils on 60 and 90 turn. In general you can not worry about the frame, and wind coils on the fingers, I'm just trying to make it accurate.

Step 3: Assembly

Now let’s look at the circuit, it consist of two parts, two coils and a transistor – is a generator, and the third coil and LED – indicator. Getting to the assembly, clean winding wires, solder transistor legs, then you need to solder one end of the 60 turns coil to the middle terminal of the transistor, to the base (if you are using 2n3904, if different, better search for the datasheet), I also pu pice of heat shrink tube in vainly, than you understand why. Solder the rest end of coil to firs transistor’s terminal it’s emitter. Next step – solder solder any end of 30 turns coil to third transistor’s terminal it’s collector. Solder a little pice of regular wire to the first transistors leg, it’s going to be power. Now turn of the LED and rest 90 turns coil, simply solder the diode terminals to the ends of the coil, the polarity is not important. At this assembly is completed.

Step 4: Power-on

Device need power supply of 1.5 to 9 volts, in my case it’s two AA batteries in series. Place coils 1 and 2, one above the other, plus is going to remained end of 30 turns coil, and wire we solder to first transistor terminal to minus. Place the indicator coil nearby. Last step is touch transistor's base with something metal to start generator, now you understand why heat shrink tube in vain? And vuala! LED lights - device works! If it doesn’t try to flip over one of the coil, or change ends of 60 turns coil.

Step 5: Final



    • Tiny Home Contest

      Tiny Home Contest
    • Fix It! Contest

      Fix It! Contest
    • Creative Misuse Contest

      Creative Misuse Contest

    36 Discussions


    Reply1 year ago

    If you watch the transmitter coil carefully u will see that both coil are placed very closely which is very much necessary for oscillation to start. Otherwise it will not oscillate hence no excitation will be sent to the transmitter coil.


    Reply1 year ago

    AE also has 2 coils which is built in a single coil for transmitting wireless power.

    Константин, а про Бровина Владимира Ильича не упомянул.

    10 replies

    This web site is not intended as a history site, so the mentioning of particular people who had a historical input into the topic being discussed is slightly irrelevant. It is intended for people to talk and demonstrate projects and other things that they have found interesting.

    Also I would suggest that as this is an English speaking web site that you should respect that and write in English. You can clearly understand English or you wouldn't have been able to read it. If I were posting on a Russian site, I would write in Russian out of politeness.

    Don't be mean just use translate if you want to figure out what they said

    No, it is rude, like whispering in public. You could be saying anything. At the university where I worked there were a lot of students whose first language was not English, but in class they were not allowed to converse in their own languages for precisely this reason.

    That is both a bit racist and very disrespectful to their culture and heritage be nice or don't say anything

    Dear TCSC47. I capitulate. You're right.

    На мой взгляд упоминать его в материале о простейшем блокинг генераторе нет необходимости. Вот когда будет что-то вроде "лженаука" или "учёные шарлатаны" тогда обязательно.

    Эта схема не является простейшим блокинг-генератором, нет глубокой трансформаторной связи, не то соотношение витков, отсутствие сердечника.

    I think there's no core because this is supposed to be a wireless charger-style experiment where the physical diameter of the loop should be relatively large (compared to a blocking oscillator used only as a blocking oscillator).
    So there are IMHO two reasons why core is absent:
    1) in such a large loop the inductance would be too high with a core (could be easily overcome by making the loop only 1 turn / 2 turns)
    2) you cannot easily find a piece of suitable ferrite material of rectangular or circle shape that big.

    How does it work? I always thought that u=di/dt. As i is constant, u should be null?

    2 replies

    The primary (he calls "generator") oscillates. You have to touch the base of the transistor to kick-start it. Would be cool to put an oscilloscope on the output coil and measure the frequency.

    Ok I understand now. I forgot that L2 was exited by the others coils. Thank you.

    I want to make a Persistence of Vision display with at least a dozen leds, how would I do it and what will I need? Thanks

    1 reply,,,,,,,,,,