Free for educational and noncommercial use ! ! !
For commercial use you must contact the author ! ! !

DESCRIPTION: Probably you have heard about Nikola Tesla and his famous experiments. Well this is based on his wireless transmission of electrical energy, but with one difference. Nikola Tesla was connecting bottom terminal of coils L1 and L2 to the ground (earth). As you can see from schematic below, I don't ground coils L1 and L2, instead I've connected copper plate to L2. So this is transmission of electrical energy with no wires. This is not a perfect solution, but it is simplest one. I would say, this is school example... Efficiency of transmission is over 60% up to 95%.

BUILDING: Coils L1 & L2 are made on PVC pipe with diameter 63mm. They have around 950 turns of copper wire diameter 0,2mm and length is 215mm. Inductance is 12,8mH and you have to make them identical... It is best if you measure them on inductance meter. If coils are not identical, than in order to compensate you'll have to use different size of top plates. I use 80x80mm copper plates used in electronics for printed board. Bottom copper plate is 120x160mm... and size of plates is not critical... because they are only capacitors ! ! ! Coils L3 & L4 are flat with inner diameter of 66 mm. They have 12 turns of copper wire diameter 0,9mm and inductance is 21uH.

Flat coils L3 & L4	Coils L1 & L2

Next important thing is transistor (mosfet). It is used as a switch, if you can't find BUZ12 you can use similar (HRF3205). Don't use external diodes or filters on L3 or transistor because is damping oscillations and you won't get transfer more than 20%. So don't be greed and try to light bulb of 100W because you'll burn transistor very fast... It is recommended to mount mosfet on aluminum cooler.             Coils must be made as you see them on photos ! ! ! L3 & L4 must be flat and L1 & L2 must have length. If L3 & L4 are not flat, than you tend to make classical transformer system it means that magnetic coupling is strong and you'll just waste energy radiating in radio waves and you won't get transmission more then 15-20%. And if you make L2 flat then you will get nothing ! ! ! So, it is obvious that geometry of coils is very important.

            As you can see on these photos above, device is working even when second transformer (receiver) is rotated 90° relative to the transmitter ! ! ! That happens because electrical energy is transmitted through electric field (using copper plates as capacitors), NOT magnetic field, and therefore it's not bounded by magnetic induction law (90°).
            If you take non-insulated metal plates in both of you hands, come closer to the transmitter and you'll notice that metal plates are burning your hands.