Simple Wireless Power

Introduction: Simple Wireless Power

I enjoy making and reverse engineering simple electronic circuits and devices. I hope you enjoy m...

Make wireless electricity easy with this simple DIY!

This project will use the principle of magnetic inductive coupling to transfer electricity between two separate coils.

Step 1: Materials

Overall, this experiment does not require too many materials, many of which can be easily acquired.

The materials are as follows:

  1. 30 gauge magnetic wire
  2. Alligator clips with leads
  3. 2N2222 NPN-Type transistor
  4. Electrical tape
  5. Low-power LED
  6. Measuring tape
  7. Scissors
  8. Pliers/wire cutters
  9. Battery (9V)
  10. Soldering gun
  11. Solder
  12. Cylinder with 2cm diameter

All of these materials can be found at local hardware stores and specialty stores such as RadioShack.

Step 2: Building the Coils

The first step in transferring wireless power it to make the coils. The two coils consist of one inducer and one receiver coil. They are made in the same manner, except the inducer coil will need a center tap.

Step 3: Inducer Coil

To build the Inducer Coil, measure out 3 meters of 30 gauge magnetic wire. Then take the cut wire and begin wrapping it around your cylinder, leaving a sizable lead. After about half of the wire has been used (about 15 turns) create the center tap. This is done by pulling about 2 cm of wire away from the coil and twisting it. Do not cut the wire! Next, finish wrapping the wire around the cylinder, leaving another lead. To prevent unwinding, put 3 pieces of electrical tape on the coil. This will not effect the overall electrical output. You are now finished with the inducer coil.

Step 4: Reciever Coil

The receiver coil is made like the Inducer coil, but without the center tap. To accomplish this, simply keep winding the coil without stopping.

***Helpful tip: Scrape off the enamel coating on the wire to ensure a good connection.

Step 5: Connecting the Transistor

The transistor is the brain of this operation. Its purpose it to connect and disconnect the power at a rapid pace, thus creating a changing magnetic field in the inducer coil. This changing magnetic field is what induces an electric current in the receiver coil; which powers the LED.

To properly connect the transistor, you need to attach the correct coil leads to the correct transistor terminals (emitter, base, and receiver). The transistor will be soldered on.

Emitter will go to the negative of the 9V battery

Base will go to one inducer coil lead

Collector will go to the other inducer coil lead

Simply solder the terminals directly to the leads, and the connection will be secure.

Step 6: Connecting the LED

The LED will be soldered to the two leads of the receiver coil. This allows the LED to be powered easily when the receiver coil is moved around the magnetic field. Each LED terminal will be connected to one lead of the receiver coil. The positive and negative of the led do not matter, as the current in the receiver is changing.

*** Helpful tip: trim the ends of the LED terminals so that it does not awkwardly stick out from the receiver coil

Step 7: Connecting the Power Source

This experiment is powered by one 9V battery

Emitter will go to the negative of the 9V battery

Center Tap will go to the positive of the 9V battery

The full project can be represented in the schematic above

***Helpful tip: only connect the power to the coil when it is in use, as long periods of connection will deplete the battery and may fry the transistor. One way to solve this problem would be to connect a 100 ohm resistor to the base of the transistor (suggested by Majstor_nizasta), but since this project is supposed to be as simple as possible, I didn't include it.

Step 8: Wireless Power

Once everything has been assembled and the power connected, hover the receiver coil over the inducer coil and watch the LED light up; without wires!!! I recommend experimenting with different positions and distances, as it is lots of fun. You can even place items between the coils, and the LED will still be powered. Also try flipping the receiver coil over if the LED is not very bright, as the magnetic flux of the receiver coil flows in one direction. The platform (black rectangle under the coils) is not necessary, but it allows you to move the whole project around more easily. It is simply the inducer coil glued to a note card wrapped in electrical tape.

Thank you for viewing, I hope you enjoy this as much as I have. And don't forget to vote this as you favorite and share it with your friends.

To learn more about the physics behind magnetic inductive coupling and wireless power, I recommend researching Howstuffworks, The Wireless Power Consortium, and Witricity.

I also highly recommend you read, the comments, there is some great information on completing this instructable thanks to all the amazing supporters!

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96 Discussions

This is really cool and i cannot wait to make one myself and test it ! Great work dude.

This is by far the best instructable in this contest.

transformer working like this i think?only coil increasing or decreasing difference.

i did exactly the same what it was given in the tutorial

i tried but i cant do it please help me guys quick

can u reply me fast pllzz.....

is it possible with 24 gauage ....?

Awesome!! Just made it & works great! I used different size wire for each coil though & only 12 windings or so. I'm only using 2 double A batteries. Really bright!! Transistor gets pretty darn hot.

Hey this is a great project, It was fun to do. How can I increase the voltage output to around 5 - 10V at a range of about 2cm

1 reply

Could make / buy a simple buck-boost circuit, check out "Joule Thief" then go make one and add it to the receiving end of your circuit ;)

what is the frequency of oscillation produced by the transistor ?

1 reply

You can use relatively simple physics equations to determine the frequency, your variables being: how many turns your coil(s) have, the value of the transistor, voltage, amperage, etc. If you are still interested I can point you in the right direction :)

will 26awg wire work

How high of a voltage should my led be

I made the circuit and I decided to put it together using jumper cables to make sure it worked before I soldered it. When I hooked it up to the 9 volt, it made sparks when I touched it and then I connected it. It worked for like a second and then it faded away. The inductor coil was warm and the transistor was so hot it burnt my finger! What might I have done?

1 reply

Wow! It sounds like you have too much power going to the transistor and you fried it. This actually happened to me once and I found out the the 9v I was using was 6 amps instead of the standard 0.5. If that is not the problem, I would recommend using a resistor