Build a Wireless Power Transmission system that can power a light bulb or charge a phone from up to 2 feet away! This uses a resonant coil system to send magnetic fields from a transmitting coil to a receiving coil.

We used this as a demo during a sermon on Maxwell’s Four Great Equations at our church!

Step 1: Things You’ll Need

Picture of Things You'll Need
Picture of Things You'll Need
  • 18 gauge magnetic wire. Note that you can’t use regular wire, you have to use magnetic wire (which has a very thin enamel insulation on it). One example is available on Amazon here:
  • A 6W (or less) AC/DC 12V Dimmable LED light bulb. One example is here:…
  • 1uF capacitors (not electrolytics, must be non-polarized). You have some choices here. If you build a low power version, you can get 250V 1uF capacitors from Radio Shack or Frys. If you want to build a high power version, you will need to get special 560V capacitors from Digikey.
  • 0.47uF Capacitor (not electrolytics, must be non-polarized)
  • Some kind of power amplifier. We used a 450W HI-FI power amp. You could use anything from that down to a PC speaker. The power more you use, the more range you’ll get out of it.
  • Solder & Solder iron. Wire cutters
  • A piece of plywood and some small nails (used for winding coils)
  • Black Electrical tape
  • Measuring tape & ruler
  • Insulated wire
  • Hammer
  • Audio source with variable frequency and amplitude that generate an 8khz sine tone. It’s easy to use a PC, Laptop or phone with freely available tone generation software and connect to the headphone jack. I used a Mac with this software:…
    Or you could use this software for a PC:
    You could also use a function generator if you have one (expensive piece of test equipment)

NTE Capacitor Part List (for the low power version). You can get these parts at Frys.

3 x 1uF 50V capacitor, NTE CML105M50 (to attach to the light bulb and the small coil)

1 x 0.47uF 50V capacitor, NTE CML474M50 (to attach to the light bulb & small coil in parallel with 1uF caps)

1 x 1uF 250V capacitor, NTE MLR105K250 (to attach to the big coil)

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